LTC1403/LTC1403A Serial 12-Bit/14-Bit, 2.8Msps Sampling ADCs with Shutdown Features Description 2.8Msps Conversion Rate nn Low Power Dissipation: 14mW nn 3V Single Supply Operation nn -40C to 125C Guaranteed Operation nn 2.5V Internal Bandgap Reference can be Overdriven nn 3-Wire Serial Interface nn Sleep (10W) Shutdown Mode nn Nap (3mW) Shutdown Mode nn 80dB Common Mode Rejection nn 0V to 2.5V Unipolar Input Range nn Tiny 10-Lead MS Package The LTC(R)1403/LTC1403A are 12-bit/14-bit, 2.8Msps serial ADCs with differential inputs. The devices draw only 4.7mA from a single 3V supply and come in a tiny 10-lead MS package. A Sleep shutdown feature lowers power consumption to 10W. The combination of speed, low power and tiny package makes the LTC1403/LTC1403A suitable for high speed, portable applications. nn The 80dB common mode rejection allows users to eliminate ground loops and common mode noise by measuring signals differentially from the source. Applications The devices convert 0V to 2.5V unipolar inputs differentially. The absolute voltage swing for +AIN and -AIN extends from ground to the supply voltage. Automotive Communications nn Data Acquisition Systems nn Uninterrupted Power Supplies nn Multiphase Motor Control nn Multiplexed Data Acquisition The serial interface sends out the conversion results during the 16 clock cycles following CONV for compatibility with standard serial interfaces. If two additional clock cycles for acquisition time are allowed after the data stream in between conversions, the full sampling rate of 2.8Msps can be achieved with a 50.4MHz clock. nn nn L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LinearView and SoftSpan are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Block Diagram AIN+ 1 + 14-BIT ADC S&H AIN- 2 -44 VDD - -50 THREESTATE SERIAL OUTPUT PORT SDO 8 14 3 VREF 2.5V REFERENCE 10F 4 GND 5 6 10 CONV 9 SCK TIMING LOGIC 11 EXPOSED PAD 1403A TA01 THD, 2nd, SFDR, 3rd (dB) 7 LTC1403A 2nd, 3rd and SFDR vs Input Frequency 3V 14-BIT LATCH 10F -56 -62 THD 2nd, SFDR -68 -74 -80 3rd -86 -92 -98 -104 0.1 1 10 FREQUENCY (MHz) 100 1403A TA02 1403fc For more information www.linear.com/LTC1403 1 LTC1403/LTC1403A Absolute Maximum Ratings Pin Configuration (Note 1, 2,) TOP VIEW Supply Voltage (VDD)...................................................4V Analog Input Voltage (Note 3).................................... -0.3V to (VDD + 0.3V) Digital Input Voltage..................... -0.3V to (VDD + 0.3V) Digital Output Voltage................... -0.3V to (VDD + 0.3V) Power Dissipation................................................100mW Operation Temperature Range LTC1403C/LTC1403AC.............................. 0C to 70C LTC1403I/LTC1403AI............................-40C to 85C LTC1403H/LTC1403AH....................... -40C to 125C Storage Temperature Range................... -65C to 150C Lead Temperature (Soldering, 10 sec).................... 300C Order Information AIN+ AIN- VREF GND GND 1 2 3 4 5 11 GND 10 9 8 7 6 CONV SCK SDO VDD GND MSE PACKAGE 10-LEAD PLASTIC MSOP TJMAX = 150C, qJA = 40C/W EXPOSED PAD (PIN 11) IS GND MUST BE SOLDERED TO PCB http://www.linear.com/product/LTC1403#orderinfo LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC1403CMSE#PBF LTC1403CMSE#TRPBF LTBDN 10-Lead Plastic MSOP 0C to 70C LTC1403IMSE#PBF LTC1403IMSE#TRPBF LTBDP 10-Lead Plastic MSOP -40C to 85C LTC1403HMSE#PBF LTC1403HMSE#TRPBF LTBDP 10-Lead Plastic MSOP -40C to 125C LTC1403ACMSE#PBF LTC1403ACMSE#TRPBF LTADF 10-Lead Plastic MSOP 0C to 70C LTC1403AIMSE#PBF LTC1403AIMSE#TRPBF LTAFD 10-Lead Plastic MSOP -40C to 85C LTC1403AHMSE#PBF LTC1403AHMSE#TRPBF LTAFD 10-Lead Plastic MSOP -40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. 2 1403fc For more information www.linear.com/LTC1403 LTC1403/LTC1403A Converter Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. With internal reference. VDD = 3V LTC1403 PARAMETER CONDITIONS MIN LTC1403H TYP MAX MIN LTC1403A TYP MAX MIN l 12 (Notes 4, 5, 18) l -2 0.25 2 -2 0.25 2 -4 Offset Error (Notes 4, 18) l -10 1 10 -20 2 20 Gain Error (Note 4, 18) l -30 5 30 -40 5 40 Gain Tempco Internal Reference (Note 4) External Reference Resolution (No Missing Codes) Integral Linearity Error 12 LTC1403AH TYP MAX MIN 14 15 1 TYP MAX UNITS 14 0.5 4 -4 -20 2 20 -60 10 60 15 1 Bits 0.5 4 LSB -30 2 30 LSB -80 10 80 LSB 15 1 15 1 ppm/C ppm/C Analog Input The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VDD = 3V SYMBOL PARAMETER CONDITIONS VIN Analog Differential Input Range (Notes 3, 9) 2.7V VDD 3.3V VCM Analog Common Mode + Differential Input Range (Note 10) IIN Analog Input Leakage Current CIN Analog Input Capacitance tACQ Sample-and-Hold Acquisition Time MIN TYP MAX UNITS 0 to 2.5 V 0 to VDD V l 1 l A 13 (Note 6) tAP Sample-and-Hold Aperture Delay Time tJITTER Sample-and-Hold Aperture Delay Time Jitter CMRR Analog Input Common Mode Rejection Ratio pF 39 l fIN = 1MHz, VIN = 0V to 3V fIN = 100MHz, VIN = 0V to 3V ns 1 ns 0.3 ps -60 -15 dB dB Dynamic Accuracy The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VDD = 3V LTC1403/LTC1403H SYMBOL PARAMETER CONDITIONS SINAD Signal-to-Noise Plus Distortion Ratio 100kHz Input Signal 1.4MHz Input Signal 1.4MHz Input Signal (H Grade) 100kHz Input Signal, External VREF = 3.3V, VDD 3.3V 750kHz Input Signal, External VREF = 3.3V, VDD 3.3V THD l l MIN TYP 68 67 70.5 70.5 70.5 72 MAX 72 LTC1403A/LTC1403AH MIN TYP 70 69 73.5 73.5 73.0 76.3 MAX UNITS dB dB dB dB 76.3 dB Total Harmonic Distortion 100kHz First 5 Harmonics 1.4MHz First 5 Harmonics SFDR Spurious Free Dynamic Range 100kHz Input Signal 1.4MHz Input Signal -87 -83 -90 -86 dB dB IMD Intermodulation Distortion 1.25V to 2.5V 1.25MHz into AIN+, 0V to 1.25V, 1.2MHz into AIN- -82 -82 dB Code-to-Code Transition Noise VREF = 2.5V (Note 18) 0.25 1 LSBRMS Full Power Bandwidth VIN = 2.5VP-P, SDO = 11585LSBP-P (Note 15) 50 50 MHz Full Linear Bandwidth S/(N + D) 68dB 5 5 MHz l -87 -83 -76 -90 -86 -78 dB dB 1403fc For more information www.linear.com/LTC1403 3 LTC1403/LTC1403A Internal Reference Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VDD = 3V PARAMETER CONDITIONS VREF Output Voltage IOUT = 0 MIN VREF Output Tempco TYP MAX UNITS 2.5 V 15 ppm//C VREF Line Regulation VDD = 2.7V to 3.6V, VREF = 2.5V 600 V/V VREF Output Resistance Load Current = 0.5mA 0.2 2 ms VREF Settling Time Digital Inputs and Digital Outputs The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VDD = 3V SYMBOL PARAMETER CONDITIONS VIH High Level Input Voltage VDD = 3.3V l VIL Low Level Input Voltage VDD = 2.7V l 0.6 V IIN Digital Input Current VIN = 0V to VDD l 10 A CIN Digital Input Capacitance VOH High Level Output Voltage VDD = 3V, IOUT = -200A VOL Low Level Output Voltage VDD = 2.7V, IOUT = 160A VDD = 2.7V, IOUT = 1.6mA l VOUT = 0V to VDD l IOZ Hi-Z Output Leakage DOUT COZ Hi-Z Output Capacitance DOUT ISOURCE Output Short-Circuit Source Current ISINK Output Short-Circuit Sink Current MIN l TYP MAX 2.4 2.5 UNITS V 5 pF 2.9 V 0.05 0.10 0.4 V V 10 A 1 pF VOUT = 0V, VDD = 3V 20 mA VOUT = VDD = 3V 15 mA Power Requirements The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Note 17) SYMBOL VDD PARAMETER Supply Voltage CONDITIONS IDD Positive Supply Voltage PD Power Dissipation Active Mode Active Mode (LTC1403H, LTC1403AH) Nap Mode Nap Mode (LTC1403H, LTC1403AH) Sleep Mode (LTC1403, LTC1403H) Sleep Mode (LTC1403A, LTC1403AH) Active Mode with SCK in Fixed State (Hi or Lo) 4 MIN 2.7 l l l l TYP MAX 3.6 4.7 5.2 1.1 1.2 2 2 12 7 8 1.5 1.8 15 10 UNITS V mA mA mA mA A A mW 1403fc For more information www.linear.com/LTC1403 LTC1403/LTC1403A Timing Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VDD = 3V SYMBOL PARAMETER fSAMPLE(MAX) Maximum Sampling Frequency per Channel (Conversion Rate) CONDITIONS l MIN 2.8 TYP MAX UNITS MHz 357 ns 10000 ns tTHROUGHPUT Minimum Sampling Period (Conversion + Acquisition Period) tSCK Clock Period (Notes 16) tCONV Conversion Time (Note 6) 17 t1 Minimum Positive or Negative SCLK Pulse Width (Note 6) 2 ns t2 CONV to SCK Setup Time (Notes 6, 10) 3 ns t3 Nearest SCK Edge Before CONV (Note 6) 0 ns t4 Minimum Positive or Negative CONV Pulse Width (Note 6) 4 ns t5 SCK to Sample Mode (Note 6) 4 ns t6 CONV to Hold Mode (Notes 6, 11) 1.2 ns t7 16th SCK to CONV Interval (Affects Acquisition Period) (Notes 6, 7, 13) 45 ns t8 Minimum Delay from SCK to Valid Bits 0 Through 13 (Notes 6, 12) t9 SCK to Hi-Z at SDO (Notes 6, 12) t10 Previous SDO Bit Remains Valid After SCK (Notes 6, 12) t12 VREF Settling Time After Sleep-to-Wake Transition (Notes 6, 14) Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: All voltage values are with respect to GND. Note 3: When these pins are taken below GND or above VDD, they will be clamped by internal diodes. This product can handle input currents greater than 100mA below GND or greater than VDD without latchup. Note 4: Offset and full-scale specifications are measured for a singleended AIN+ input with AIN- grounded and using the internal 2.5V reference. Note 5: Integral linearity is tested with an external 2.55V reference and is defined as the deviation of a code from the straight line passing through the actual endpoints of a transfer curve. The deviation is measured from the center of quantization band. Note 6: Guaranteed by design, not subject to test. Note 7: Recommended operating conditions. Note 8: The analog input range is defined for the voltage difference between AIN+ and AIN-. Note 9: The absolute voltage at AIN+ and AIN- must be within this range. l l 19.8 18 2 SCLK cycles 8 ns 6 ns ns 2 ms Note 10: If less than 3ns is allowed, the output data will appear one clock cycle later. It is best for CONV to rise half a clock before SCK, when running the clock at rated speed. Note 11: Not the same as aperture delay. Aperture delay is smaller (1ns) because the 2.2ns delay through the sample-and-hold is subtracted from the CONV to Hold mode delay. Note 12: The rising edge of SCK is guaranteed to catch the data coming out into a storage latch. Note 13: The time period for acquiring the input signal is started by the 16th rising clock and it is ended by the rising edge of convert. Note 14: The internal reference settles in 2ms after it wakes up from Sleep mode with one or more cycles at SCK and a 10F capacitive load. Note 15: The full power bandwidth is the frequency where the output code swing drops to 3dB with a 2.5VP-P input sine wave. Note 16: Maximum clock period guarantees analog performance during conversion. Output data can be read without an arbitrarily long clock. Note 17: VDD = 3V, fSAMPLE = 2.8Msps. Note 18: The LTC1403A is measured and specified with 14-bit Resolution (1LSB = 152V) and the LTC1403 is measured and specified with 12-bit Resolution (1LSB = 610V). 1403fc For more information www.linear.com/LTC1403 5 LTC1403/LTC1403A Typical Performance Characteristics THD, 2nd and 3rd vs Input Frequency 11.5 71 11.0 68 10.5 65 10.0 62 9.5 59 9.0 56 8.5 53 8.0 0.1 104 -50 98 THD -56 -74 3rd -80 62 -92 56 -98 50 1 10 FREQUENCY (MHz) 0 SNR (dB) 65 62 59 56 53 1 10 FREQUENCY (MHz) -30 -40 -40 -50 -60 -70 -80 -60 -70 -80 -90 -100 -100 -110 -110 700k 1.05M FREQUENCY (Hz) -120 1.4M -50 -60 -70 -80 -90 -100 1.0 4 0.8 3 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 1.4M 1403A G07 700k 1.05M FREQUENCY (Hz) -1.0 1.4M 2 1 0 -1 -2 -3 -0.8 -110 350k Integral Linearity vs Output Code INTEGRAL LINEARITY (LSB) DIFFERENTIAL LINEARITY (LSB) -40 0 1403A G06 Differential Linearity vs Output Code -30 MAGNITUDE (dB) -50 -90 350k 2.8Msps 1403A G05 2.8Msps 700k 1.05M FREQUENCY (Hz) 0 -10 -20 0 100 1.3MHz Sine Wave 4096 Point FFT Plot -30 -120 100 -20 1 10 FREQUENCY (MHz) 1403A G03 2.8Msps 1403A G04 350k 44 0.1 -20 1.4MHz Input Summed with 1.56MHz Input IMD 4096 Point FFT Plot 6 100 MAGNITUDE (dB) MAGNITUDE (dB) 68 0 68 -86 -10 71 -120 74 98kHz Sine Wave 4096 Point FFT Plot 74 0 80 1403A G02 SNR vs Input Frequency -10 86 -68 1403A G01 50 0.1 92 2nd -62 -104 0.1 50 100 1 10 FREQUENCY (MHz) SFDR vs Input Frequency -44 SFDR (dB) 74 THD, 2nd, 3rd (dB) 12.0 SINAD (dB) ENOBs (BITS) ENOBs and SINAD vs Input Frequency TA = 25C, VDD = 3V (LTC1403A) 0 4096 8192 12288 OUTPUT CODE 16383 1403A G08 -4 0 4096 8192 12288 OUTPUT CODE 16383 1403A G09 1403fc For more information www.linear.com/LTC1403 LTC1403/LTC1403A Typical Performance Characteristics Differential and Integral Linearity vs Conversion Rate 5 4 79 MAX INL 2 EXTERNAL VREF = 3.3V fIN~fS/3 78 77 MAX DNL 1 S/(N+D) LINEARITY (LSB) SINAD vs Conversion Rate 80 18 CLOCKS PER CONVERSION 3 0 -1 MIN DNL -2 -3 EXTERNAL VREF = 3.3V fIN~fS/40 76 75 74 73 72 INTERNAL V REF = 2.5V fIN~fS/40 71 INTERNAL VREF = 2.5V fIN~fS/3 70 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 CONVERSION RATE (Msps) MIN INL -4 -5 TA = 25C, VDD = 3V (LTC1403A) 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 CONVERSION RATE (Msps) 1403A G10 1403A G11 TA = 25C, VDD = 3V (LTC1403 and LTC1403A) 12 2.5VP-P Power Bandwidth CMRR vs Frequency PSRR vs Frequency -25 0 6 -30 -20 -35 -40 -12 -18 PSRR (dB) -40 -6 CMRR (dB) AMPLITUDE (dB) 0 -60 -55 -80 -24 -60 -100 -30 -36 1M 10M 100M FREQUENCY (Hz) -65 -120 100 1G -45 -50 1k 10k 100k 1M FREQUENCY (Hz) 1403A G12 10M -70 100M 1 10 100 1k 10k FREQUENCY (Hz) VDD Supply Current vs Conversion Rate Reference Voltage vs VDD 2.4902 2.4902 2.4900 2.4900 2.4898 2.4898 1M 1403A G14 1403A G13 Reference Voltage vs Load Current 100k 6.0 2.4896 VDD SUPPLY CURRENT (mA) VREF (V) VREF (V) 5.5 2.4896 2.4894 2.4894 2.4892 2.4892 2.4890 2.4890 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 LOAD CURRENT (mA) 1403A G15 2.6 2.8 3.0 3.2 VDD (V) 3.4 3.6 1403A G16 0 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 CONVERSION RATE (Msps) 1403A G17 1403fc For more information www.linear.com/LTC1403 7 LTC1403/LTC1403A Pin Functions AIN+ (Pin 1): Noninverting Analog Input. AIN+ operates fully differentially with respect to AIN- with a 0V to 2.5V differential swing and a 0V to VDD common mode swing. solid analog ground plane with a 10F ceramic capacitor (or 10F tantalum in parallel with 0.1F ceramic). Keep in mind that internal analog currents and digital output signal currents flow through this pin. Care should be taken to place the 0.1F bypass capacitor as close to Pins 6 and 7 as possible. AIN- (Pin 2): Inverting Analog Input. AIN- operates fully differentially with respect to AIN+ with a -2.5V to 0V differential swing and a 0V to VDD common mode swing. SDO (Pin 8): Three-State Serial Data Output. Each of output data words represents the difference between AIN+ and AIN- analog inputs at the start of the previous conversion. VREF (Pin 3): 2.5V Internal Reference. Bypass to GND and to a solid analog ground plane with a 10F ceramic capacitor (or 10F tantalum in parallel with 0.1F ceramic). Can be overdriven by an external reference between 2.55V and VDD. SCK (Pin 9): External Clock Input. Advances the conversion process and sequences the output data on the rising edge. Responds to TTL (3V) and 3V CMOS levels. One or more pulses wake from sleep. GND (Pins 5, 6, 11): Ground and Exposed Pad. These ground pins and the exposed pad must be tied directly to the solid ground plane under the part. Keep in mind that analog signal currents and digital output signal currents flow through these pins. CONV (Pin 10): Convert Start. Holds the analog input signal and starts the conversion on the rising edge. Responds to TTL (3V) and 3V CMOS levels. Two pulses with SCK in fixed high or fixed low state start Nap mode. Four or more pulses with SCK in fixed high or fixed low state start Sleep mode. VDD (Pin 7): 3V Positive Supply. This single power pin supplies 3V to the entire chip. Bypass to GND and to a Block Diagram 7 LTC1403A AIN+ 1 + AIN- 2 - 3V VDD 14-BIT ADC S&H THREESTATE SERIAL OUTPUT PORT 14-BIT LATCH 10F 8 SDO 10 CONV 9 SCK 14 3 VREF 2.5V REFERENCE 10F 4 GND 5 8 6 TIMING LOGIC 11 EXPOSED PAD 1403A BD 1403fc For more information www.linear.com/LTC1403 LTC1403/LTC1403A Timing Diagram LTC1403 Timing Diagram t2 t3 16 17 t7 t1 1 2 3 4 5 6 7 8 9 10 11 12 13 15 14 16 17 18 1 SCK t4 t5 CONV t6 INTERNAL S/H STATUS tACQ SAMPLE HOLD t8 t8 t10 SDO REPRESENTS THE ANALOG INPUT FROM THE PREVIOUS CONVERSION Hi-Z SDO SAMPLE D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X HOLD t9 Hi-Z X 1403A TD01 14-BIT DATA WORD tCONV tTHROUGHPUT *BITS MARKED "X" AFTER D0 SHOULD BE IGNORED. LTC1403A Timing Diagram t2 t3 16 17 1 t7 t1 2 3 4 5 6 7 8 9 10 11 12 13 15 14 16 17 18 1 SCK t4 t5 CONV t6 INTERNAL S/H STATUS tACQ SAMPLE HOLD t8 SDO Hi-Z SAMPLE t8 t10 SDO REPRESENTS THE ANALOG INPUT FROM THE PREVIOUS CONVERSION D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 HOLD t9 D0 Hi-Z 1403A TD01b 14-BIT DATA WORD tCONV tTHROUGHPUT Nap Mode and Sleep Mode Waveforms SLK t1 t1 CONV NAP SLEEP t12 VREF 1403A TD02 NOTE: NAP AND SLEEP ARE INTERNAL SIGNALS SCK to SDO Delay SCK VIH SCK t8 t10 SDO VIH t9 VOH VOL 90% SDO 10% 1403A TD03 1403fc For more information www.linear.com/LTC1403 9 LTC1403/LTC1403A Applications Information Driving the Analog Input The differential analog inputs of the LTC1403/LTC1403A are easy to drive. The inputs may be driven differentially or as a single-ended input (i.e., the AIN- input is grounded). Both differential analog inputs, AIN+ with AIN-, are sampled at the same instant. Any unwanted signal that is common to both inputs of each input pair will be reduced by the common mode rejection of the sample-and-hold circuit. The inputs draw only one small current spike while charging the sample-and-hold capacitors at the end of conversion. During conversion, the analog inputs draw only a small leakage current. If the source impedance of the driving circuit is low, then the LTC1403/LTC1403A inputs can be driven directly. As source impedance increases, so will acquisition time. For minimum acquisition time with high source impedance, a buffer amplifier must be used. The main requirement is that the amplifier driving the analog input(s) must settle after the small current spike before the next conversion starts (settling time must be 39ns for full throughput rate). Also keep in mind while choosing an input amplifier, the amount of noise and harmonic distortion added by the amplifier. Choosing an Input Amplifier Choosing an input amplifier is easy if a few requirements are taken into consideration. First, to limit the magnitude of the voltage spike seen by the amplifier from charging the sampling capacitor, choose an amplifier that has a low output impedance (<100) at the closed-loop bandwidth frequency. For example, if an amplifier is used in a gain of 1 and has a unity-gain bandwidth of 50MHz, then the output impedance at 50MHz must be less than 100. The second requirement is that the closed-loop bandwidth must be greater than 40MHz to ensure adequate small-signal settling for full throughput rate. If slower op amps are used, more time for settling can be provided by increasing the time between conversions. The best choice for an op amp to drive the LTC1403/LTC1403A will depend on the application. Generally, applications fall into two categories: AC applications where dynamic specifications are most critical and time domain applications where DC accuracy and settling time are most critical. The following list is a summary of the op amps that are suitable for driving the LTC1403/LTC1403A. (More detailed information is 10 available in the Linear Technology Databooks and on the LinearViewTM CD-ROM.) LTC(R)1566-1: Low Noise 2.3MHz Continuous Time LowPass Filter. LT1630: Dual 30MHz Rail-to-Rail Voltage FB Amplifier. 2.7V to 15V supplies. Very high AVOL, 500V offset and 520ns settling to 0.5LSB for a 4V swing. THD and noise are -93dB to 40kHz and below 1LSB to 320kHz (AV = 1, 2VP-P into 1k, VS = 5V), making the part excellent for AC applications (to 1/3 Nyquist) where rail-to-rail performance is desired. Quad version is available as LT1631. LT1632: Dual 45MHz Rail-to-Rail Voltage FB Amplifier. 2.7V to 15V supplies. Very high AVOL, 1.5mV offset and 400ns settling to 0.5LSB for a 4V swing. It is suitable for applications with a single 5V supply. THD and noise are -93dB to 40kHz and below 1LSB to 800kHz (AV = 1, 2VP-P into 1k, VS = 5V), making the part excellent for AC applications where rail-to-rail performance is desired. Quad version is available as LT1633. LT1813: Dual 100MHz 750V/s 3mA Voltage Feedback Amplifier. 5V to 5V supplies. Distortion is -86dB to 100kHz and -77dB to 1MHz with 5V supplies (2VP-P into 500). Excellent part for fast AC applications with 5V supplies. LT1801: 80MHz GBWP, -75dBc at 500kHz, 2mA/Amplifier, 8.5nV/Hz. LT1806/LT1807: 325MHz GBWP, -80dBc Distortion at 5MHz, Unity-Gain Stable, R-R In and Out, 10mA/Amplifier, 3.5nV/Hz. LT1810: 180MHz GBWP, -90dBc Distortion at 5MHz, UnityGain Stable, R-R In and Out, 15mA/Amplifier, 16nV/Hz. LT1818/LT1819: 400MHz, 2500V/s,9mA, Single/Dual Voltage Mode Operational Amplifier. LT6200: 165MHz GBWP, -85dBc Distortion at 1MHz, Unity-Gain Stable, R-R In and Out, 15mA/Amplifier, 0.95nV/Hz. LT6203: 100MHz GBWP, -80dBc Distortion at 1MHz, UnityGain Stable, R-R In and Out, 3mA/Amplifier, 1.9nV/Hz. LT6600-10: Amplifier/Filter Differential In/Out with 10MHz Cutoff. 1403fc For more information www.linear.com/LTC1403 LTC1403/LTC1403A APPLICATIONS INFORMATION 51 1 47pF AIN+ 2 AIN- LTC1403/ LTC1403A 3 VREF 3 3VREF 11 LTC1403/ LTC1403A 10F 11 10F VREF GND GND 1403A F02 1403A F01 Figure 1. RC Input Filter Figure 2 Input Filtering and Source Impedance Input Range The noise and the distortion of the input amplifier and other circuitry must be considered since they will add to the LTC1403/LTC1403A noise and distortion. The small-signal bandwidth of the sample-and-hold circuit is 50MHz. Any noise or distortion products that are present at the analog inputs will be summed over this entire bandwidth. Noisy input circuitry should be filtered prior to the analog inputs to minimize noise. A simple 1-pole RC filter is sufficient for many applications. For example, Figure 1 shows a 47pF capacitor from AIN+ to ground and a 51 source resistor to limit the input bandwidth to 47MHz. The 47pF capacitor also acts as a charge reservoir for the input sample-and-hold and isolates the ADC input from sampling-glitch sensitive circuitry. High quality capacitors and resistors should be used since these components can add distortion. NPO and silvermica type dielectric capacitors have excellent linearity. Carbon surface mount resistors can generate distortion from self heating and from damage that may occur during soldering. Metal film surface mount resistors are much less susceptible to both problems. When high amplitude unwanted signals are close in frequency to the desired signal frequency, a multiple pole filter is required. High external source resistance, combined with the 13pF of input capacitance, will reduce the rated 50MHz bandwidth and increase acquisition time beyond 39ns. The analog inputs of the LTC1403/LTC1403A may be driven fully differentially with a single supply. Each input may swing up to 3VP-P individually. In the conversion range, the noninverting input of each channel is always up to 2.5V more positive than the inverting input of each channel. The 0V to 2.5V range is also ideally suited for single-ended input use with single supply applications. The common mode range of the inputs extend from ground to the supply voltage VDD. If the difference between the AIN+ and AIN- inputs exceeds 2.5V, the output code will stay fixed at all ones and if this difference goes below 0V, the output code will stay fixed at all zeros. Internal Reference The LTC1403/LTC1403A has an on-chip, temperature compensated, bandgap reference that is factory trimmed near 2.5V to obtain 2.5V input span. The reference amplifier output VREF, (Pin 3) must be bypassed with a capacitor to ground. The reference amplifier is stable with capacitors of 1F or greater. For the best noise performance, a 10F ceramic or a 10F tantalum in parallel with a 0.1F ceramic is recommended. The VREF pin can be overdriven with an external reference as shown in Figure 2. The voltage of the external reference must be higher than the 2.5V of the class A pull-up output of the internal reference. The recommended range for an external reference is 2.55V to VDD. An external reference at 2.55V will see a DC quiescent load of 0.75mA and as much as 3mA during conversion. 1403fc For more information www.linear.com/LTC1403 11 LTC1403/LTC1403A APPLICATIONS INFORMATION LTC1403/LTC1403A Transfer Characteristic CMRR vs Frequency 0 111...111 -20 UNIPOLAR OUTPUT CODE 111...110 CMRR (dB) -40 -60 -80 111...101 000...010 -100 000...001 -120 100 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M 000...000 0 INPUT VOLTAGE (V) 1403A F03 1403A F04 Figure 3 Figure 4 Input Span Versus Reference Voltage The differential input range has a unipolar voltage span that equals the difference between the voltage at the reference buffer output VREF at Pin 3, and the voltage at the ground (Exposed Pad Ground). The differential input range of the ADC is 0V to 2.5V when using the internal reference. The internal ADC is referenced to these two nodes. This relationship also holds true with an external reference. Differential Inputs The LTC1403/LTC1403A has a unique differential sampleand-hold circuit that allows inputs from ground to VDD. The ADC will always convert the unipolar difference of AIN+ - AIN-, independent of the common mode voltage 12 FS - 1LSB at the inputs. The common mode rejection holds up at extremely high frequencies, see Figure 3. The only requirement is that both inputs not go below ground or exceed VDD. Integral nonlinearity errors (INL) and differential nonlinearity errors (DNL) are largely independent of the common mode voltage. However, the offset error will vary. The change in offset error is typically less than 0.1% of the common mode voltage. Figure 4 shows the ideal input/output characteristics for the LTC1403/LTC1403A. The code transitions occur midway between successive integer LSB values (i.e., 0.5LSB, 1.5LSB, 2.5LSB, FS - 1.5LSB). The output code is natural binary with 1LSB = 2.5V/16384 = 153V for the LTC1403A, and 1LSB = 2.5V/4096 = 610V for the LTC1403. The LTC1403A has 1LSB RMS of random white noise. 1403fc For more information www.linear.com/LTC1403 LTC1403/LTC1403A APPLICATIONS INFORMATION For optimum performance, a 10F surface mount AVX capacitor with a 0.1F ceramic is recommended for the VDD and VREF pins. Alternatively, 10F ceramic chip capacitors such as Murata GRM235Y5V106Z016 may be used. The capacitors must be located as close to the pins as possible. The traces connecting the pins and the bypass capacitors must be kept short and should be made as wide as possible. Figure 5. Recommended Layout Figure 5 shows the recommended system ground connections. All analog circuitry grounds should be terminated at the LTC1403/LTC1403A GND (Pins 4, 5, 6 and exposed pad). The ground return from the LTC1403/LTC1403A (Pins 4, 5, 6 and exposed pad) to the power supply should be low impedance for noise free operation. Digital circuitry grounds must be connected to the digital supply common. In applications where the ADC data outputs and control signals are connected to a continuously active microprocessor bus, it is possible to get errors in the conversion results. These errors are due to feedthrough from the microprocessor to the successive approximation comparator. The problem can be eliminated by forcing the microprocessor into a Wait state during conversion or by using three-state buffers to isolate the ADC data bus. Board Layout and Bypassing Power-Down Modes Wire wrap boards are not recommended for high resolution and/or high speed A/D converters. To obtain the best performance from the LTC1403/LTC1403A, a printed circuit board with ground plane is required. Layout for the printed circuit board should ensure that digital and analog signal lines are separated as much as possible. In particular, care should be taken not to run any digital track alongside an analog signal track. If optimum phase match between the inputs is desired, the length of the two input wires should be kept matched. Upon power-up, the LTC1403/LTC1403A is initialized to the active state and is ready for conversion. The Nap and Sleep mode waveforms show the power-down modes for the LTC1403/LTC1403A. The SCK and CONV inputs control the power-down modes (see Timing Diagrams). Two rising edges at CONV, without any intervening rising edges at SCK, put the LTC1403/LTC1403A in Nap mode and the power drain drops from 14mW to 6mW. The internal reference remains powered in Nap mode. One or more rising edges at SCK wake up the LTC1403/LTC1403A for service very quickly, and CONV can start an accurate conversion within a clock cycle. Four rising edges at CONV, without any High quality tantalum and ceramic bypass capacitors should be used at the VDD and VREF pins as shown in the Block Diagram on the first page of this data sheet. 1403fc For more information www.linear.com/LTC1403 13 LTC1403/LTC1403A APPLICATIONS INFORMATION intervening rising edges at SCK, put the LTC1403/ LTC1403A in Sleep mode and the power drain drops from 16mW to 10W. One or more rising edges at SCK wake up the LTC1403/LTC1403A for operation. The internal reference (VREF) takes 2ms to slew and settle with a 10F load. Note that, using sleep mode more frequently than every 2ms, compromises the settled accuracy of the internal reference. Note that, for slower conversion rates, the Nap and Sleep modes can be used for substantial reductions in power consumption. the appropriate number of inverters to ensure the correct delay driving the frame sync input of the processor serial port. It is good practice to drive the LTC1403/LTC1403A CONV input first to avoid digital noise interference during the sample-to-hold transition triggered by CONV at the start of conversion. It is also good practice to keep the width of the low portion of the CONV signal greater than 15ns to avoid introducing glitches in the front end of the ADC just before the sample-and-hold goes into hold mode at the rising edge of CONV. Digital Interface Minimizing Jitter on the CONV Input The LTC1403/LTC1403A has a 3-wire SPI (Serial Protocol Interface) interface. The SCK and CONV inputs and SDO output implement this interface. The SCK and CONV inputs accept swings from 3V logic and are TTL compatible, if the logic swing does not exceed VDD. A detailed description of the three serial port signals follows: Conversion Start Input (CONV) The rising edge of CONV starts a conversion, but subsequent rising edges at CONV are ignored by the LTC1403/ LTC1403A until the following 16 SCK rising edges have occurred and track mode starts again. It is also necessary to have a minimum of 17 rising edges of the clock input SCK between rising edges of CONV for SDO to go to the Hi-Z state and to prepare the internal ADC logic for the next conversion. But to obtain maximum conversion speed, it is necessary to allow one more clock period between conversions to allow 39ns of acquisition time for the internal ADC sample-and-hold circuit. With 17 clock periods per conversion, the maximum conversion rate is limited to 2.8Msps to allow 39ns for acquisition time. In either case, the output data stream comes out within the first 16 clock periods to ensure compatibility with processor serial ports. The duty cycle of CONV can be arbitrarily chosen to be used as a frame sync signal for the processor serial port. A simple approach to generate CONV is to create a pulse that is one SCK wide to drive the LTC1403/LTC1403A and then buffer this signal with 14 In high speed applications where high amplitude sinewaves above 100kHz are sampled, the CONV signal must have as little jitter as possible (10ps or less). The square wave output of a common crystal clock module usually meets this requirement easily. The challenge is to generate a CONV signal from this crystal clock without jitter corruption from other digital circuits in the system. A clock divider and any gates in the signal path from the crystal clock to the CONV input should not share the same integrated circuit with other parts of the system. As shown in the interface circuit examples, the SCK and CONV inputs should be driven first, with digital buffers used to drive the serial port interface. Also note that the master clock in the DSP may already be corrupted with jitter, even if it comes directly from the DSP crystal. Another problem with high speed processor clocks is that they often use a low cost, low speed crystal (i.e., 10MHz) to generate a fast, but jittery, phase-locked-loop system clock (i.e., 40MHz). The jitter in these PLL-generated high speed clocks can be several nanoseconds. Note that if you choose to use the frame sync signal generated by the DSP port, this signal will have the same jitter of the DSP's master clock. Serial Clock Input (SCK) The rising edge of SCK advances the conversion process and also updates each bit in the SDO data stream. After CONV rises, the third rising edge of SCK starts clocking out the 12/14 data bits with the MSB sent first. A simple approach is to generate SCK to drive the LTC1403/LTC1403A 1403fc For more information www.linear.com/LTC1403 LTC1403/LTC1403A Applications Information first and then buffer this signal with the appropriate number of inverters to drive the serial clock input of the processor serial port. Use the falling edge of the clock to latch data from the Serial Data Output (SDO) into your processor serial port. The 14-bit Serial Data will be received right justified, in a 16-bit word with 17 or more clocks per frame sync. It is good practice to drive the LTC1403/LTC1403A SCK input first to avoid digital noise interference during the internal bit comparison decision by the internal high speed comparator. Unlike the CONV input, the SCK input is not sensitive to jitter because the input signal is already sampled and held constant. Serial Data Output (SDO) Upon power-up, the SDO output is automatically reset to the high impedance state. The SDO output remains in high impedance until a new conversion is started. SDO sends out 12/14 bits in the output data stream beginning at the third rising edge of SCK after the rising edge of CONV. SDO is always in high impedance mode when it is not sending out data bits. Please note the delay specification from SCK to a valid SDO. SDO is always guaranteed to be valid by the next rising edge of SCK. The 16-bit output data stream is compatible with the 16-bit or 32-bit serial port of most processors. Hardware interface to TMS320C54x The LTC1403/LTC1403A is a serial output ADC whose interface has been designed for high speed buffered serial ports in fast digital signal processors (DSPs). Figure 6 shows an example of this interface using a TMS320C54X. The buffered serial port in the TMS320C54x has direct access to a 2kB segment of memory. The ADC's serial data can be collected in two alternating 1kB segments, in real time, at the full 2.8Msps conversion rate of the LTC1403/LTC1403A. The DSP assembly code sets frame sync mode at the BFSR pin to accept an external positive going pulse and the serial clock at the BCLKR pin to accept an external positive edge clock. Buffers near the LTC1403/ LTC1403A may be added to drive long tracks to the DSP to prevent corruption of the signal to LTC1403/LTC1403A. This configuration is adequate to traverse a typical system board, but source resistors at the buffer outputs and termination resistors at the DSP, may be needed to match the characteristic impedance of very long transmission lines. If you need to terminate the SDO transmission line, buffer it first with one or two 74ACTxx gates. The TTL threshold inputs of the DSP port respond properly to the 3V swing from the SDO pin. 3V VDD CONV SCK SDO LTC1403/ GND LTC1403A 5V 7 VCC 10 BFSR 9 BCLKR B13 8 B12 BDR 6 CONV CLK 3-WIRE SERIAL INTERFACELINK TMS320C54x 1403A F06 0V TO 3V LOGIC SWING Figure 6. DSP Serial Interface to TMS320C54x 1403fc For more information www.linear.com/LTC1403 15 LTC1403/LTC1403A Applications Information ; ; ; ; ; ; ; ; ; ; ; ; 01-08-01 ****************************************************************** Files: 014SI.ASM -> 1403A Sine wave collection with Serial Port interface bvectors.asm buffered mode to avoid standard mode bug. s2k14ini.asm 2k buffer size. first element at 1024, last element at 1023, two middles at 2047 and 0000 unipolar mode negative edge BCLKR negative BFSR pulse -0 data shifted 1' cable from counter to CONV at DUT 2' cable from counter to CLK at DUT *************************************************************************** .width 160 .length 110 .title "sineb0 BSP in auto buffer mode" .mmregs .setsect ".text", 0x500,0 ;Set address of executable .setsect "vectors", 0x180,0 ;Set address of incoming 1403 data .setsect "buffer", 0x800,0 ;Set address of BSP buffer for clearing .setsect "result", 0x1800,0 ;Set address of result for clearing .text ;.text marks start of code start: tim=#0fh prd=#0fh tcr = #10h tspc = #0h pmst = #01a0h sp = #0700h dp = #0 ar2 = #1800h ar3 = #0800h ar4 = #0h call sineinit sinepeek: call sineinit wait ; goto wait ;this label seems necessary ;Make sure /PWRDWN is low at J1-9 ;to turn off AC01 adc ; ; ; ; ; ; ; ; stop timer stop TDM serial port to AC01 set up iptr. Processor Mode STatus register init stack pointer. data page pointer to computed receive buffer. pointer to Buffered Serial Port receive buffer reset record counter ; Double clutch the initialization to insure a proper ; reset. The external frame sync must occur 2.5 clocks ; or more after the port comes out of reset. ----------------Buffered Receive Interrupt Routine ------------------ breceive: ifr = #10h ; clear interrupt flags TC = bitf(@BSPCE,#4000h) ; check which half (bspce(bit14)) of buffer if (NTC) goto bufull ; if this still the first half get next half bspce = #(2023h + 08000h); turn on halt for second half (bspce(bit15)) return _ enable ; --------------mask and shift input data ---------------------------bufull: b = *ar3+ << -0 b = #03FFFh & b *ar2+ = data(#0bh) TC = (@ar2 == #02000h) if (TC) goto start goto bufull 16 ; load acc b with BSP buffer and shift right -0 ; mask out the TRISTATE bits with #03FFFh ; ; store B to out buffer and advance AR2 pointer ; output buffer is 2k starting at 1800h ; restart if out buffer is at 1fffh 1403fc For more information www.linear.com/LTC1403 LTC1403/LTC1403A Applications Information ; bsend ; -------------------dummy bsend return-----------------------return _ enable ;this is also a dummy return to define bsend ;in vector table file BVECTORS.ASM ----------------------- end ISR ---------------------------.copy "c:\dskplus\1403\s2k14ini.asm" ;initialize buffered serial port .space 16*32 ;clear a chunk at the end to mark the end ;====================================================================== ; ; VECTORS ; ;====================================================================== .sect "vectors" ;The vectors start here .copy "c:\dskplus\1403\bvectors.asm" ;get BSP vectors .sect "buffer" .space 16*0x800 .sect "result" .space 16*0x800 ;Set address of BSP buffer for clearing ;Set address of result for clearing .end ********************************************************************** * (C) COPYRIGHT TEXAS INSTRUMENTS, INC. 1996 ********************************************************************** * * File: s2k14ini.ASM BSP initialization code for the `C54x DSKplus * for use with 1403A in standard mode * BSPC and SPC are the same in the `C542 * BSPCE and SPCE seem the same in the `C542 ********************************************************************** .title "Buffered Serial Port Initialization Routine" ON .set 1 OFF .set !ON YES .set 1 NO .set !YES BIT _ 8 .set 2 BIT _ 10 .set 1 BIT _ 12 .set 3 BIT _ 16 .set 0 GO .set 0x80 * * * * * * ********************************************************************** * This is an example of how to initialize the Buffered Serial Port (BSP). * The BSP is initialized to require an external CLK and FSX for * operation. The data format is 16-bits, burst mode, with autobuffering * enabled. * ***************************************************************************************************** *LTC1403 timing from LCC28 socket board with 10MHz crystal.* *10MHz, divided from 40MHz, forced to CLKIN by 1403 board. * *Horizontal scale is 25ns/chr or 100ns period at BCLKR.. * *Timing measured at DSP pins. Jxx pin labels for jumper cable. * *BFSR Pin J1-20 ~~\ _ _ _ _ /~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\ _ _ _ _ /~~~~~~~~~~~* *BCLKR Pin J1-14 _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~\ _ /~* *BDR Pin J1-26 _ --- _ --- _ ---<B13-B12-B11-B10-B09-B08-B07-B06-B05-B04-B03-B02-B01-B00>--- _ ---<B13-B12* *CLKIN Pin J5-09 ~~~~~\ _ _ _ _ _ _ _ /~~~~~~~\ _ _ _ _ _ _ _ /~~~~~~~\ _ _ _ _ _ _ _ /~~~~~~~\ _ _ _ _ _ _ _ /~~~~~~~\ _ _ _ _ _ _ _ /~~~~~* *C542 read 0 B13 B12 B11 B10 B09 B08 B07 B06 B05 B04 B03 B02 B01 B00 0 0 B13 B12* 1403fc For more information www.linear.com/LTC1403 17 LTC1403/LTC1403A Applications Information * * * negative edge BCLKR * negative BFSR pulse * no data shifted * 1' cable from counter to CONV at DUT * 2' cable from counter to CLK at DUT *No right shift is needed to right justify the input data in the main program * *the two msbs should also be masked.................... * ***************************************************************************************************** * Loopback .set NO ;(digital looback mode?) DLB bit Format .set BIT _ 16 ;(Data format? 16,12,10,8) FO bit IntSync .set NO ;(internal Frame syncs generated?) TXM bit IntCLK .set NO ;(internal clks generated?) MCM bit BurstMode .set YES ;(if BurstMode=NO, then Continuous) FSM bit CLKDIV .set 3 ;(3=default value, 1/4 CLOCKOUT) PCM _ Mode .set NO ;(Turn on PCM mode?) FS _ polarity .set YES ;(change polarity)YES=^^^\ _ /^^^, NO= _ _ _ /^\ _ _ _ CLK _ polarity .set NO ;(change polarity)for BCLKR YES= _ /^, NO=~\ _ Frame _ ignore .set !YES ;(inverted !YES -ignores frame) XMTautobuf .set NO ;(transmit autobuffering) RCVautobuf .set YES ;(receive autobuffering) XMThalt .set NO ;(transmit buff halt if XMT buff is full) RCVhalt .set NO ;(receive buff halt if RCV buff is full) XMTbufAddr .set 0x800 ;(address of transmit buffer) XMTbufSize .set 0x000 ;(length of transmit buffer) RCVbufAddr .set 0x800 ;(address of receive buffer) RCVbufSize .set 0x800 ;(length of receive buffer)works up to 800 * * See notes in the `C54x CPU and Peripherals Reference Guide on setting up * valid buffer start and length values. Page 9-44 * * ********************************************************************** .eval ((Loopback >> 1)|((Format & 2)<<1)|(BurstMode <<3)|(IntCLK <<4)|(IntSync <<5)) ,SPCval .eval ((CLKDIV)|(FS _ polarity <<5)|(CLK _ polarity<<6)|((Format & 1)<<7)|(Frame _ ignore<<8)|(PCM _ Mode<<9)),SPCEval .eval (SPCEval|(XMTautobuf<<10)|(XMThalt<<12)|(RCVautobuf<<13)|(RCVhalt<<15)), SPCEval sineinit: bspc = #SPCval ifr = #10h imr = #210h intm = 0 bspce = #SPCEval axr = #XMTbufAddr bkx = #XMTbufSize arr = #RCVbufAddr bkr = #RCVbufSize bspc = #(SPCval | GO) return ; ; ; ; ; ; ; ; ; places buffered serial port in reset ; clear interrupt flags ; Enable HPINT,enable BRINT0 ; all unmasked interrupts are enabled. ; programs BSPCE and ABU ; initializes transmit buffer start address ; initializes transmit buffer size ; initializes receive buffer start address ; initializes receive buffer size ; bring buffered serial port out of reset ;for transmit and receive because GO=0xC0 *************************************************************************** File: BVECTORS.ASM -> Vector Table for the `C54x DSKplus 10.Jul.96 BSP vectors and Debugger vectors TDM vectors just return *************************************************************************** The vectors in this table can be configured for processing external and internal software interrupts. The DSKplus debugger uses four interrupt vectors. These are RESET, TRAP2, INT2, and HPIINT. 18 1403fc For more information www.linear.com/LTC1403 LTC1403/LTC1403A Applications Information ; ; ; ; ; ; ; ; * DO NOT MODIFY THESE FOUR VECTORS IF YOU PLAN TO USE THE DEBUGGER * All other vector locations are free to use. When programming always be sure the HPIINT bit is unmasked (IMR=200h) to allow the communications kernel and host PC interact. INT2 should normally be masked (IMR(bit 2) = 0) so that the DSP will not interrupt itself during a HINT. HINT is tied to INT2 externally. reset nmi trap2 int0 int1 int2 tint brint bxint trint txint int3 hpiint .title "Vector Table" .mmregs goto #80h nop nop return _ enable nop nop nop goto #88h nop nop .space 52*16 return _ enable nop nop nop return _ enable nop nop nop return _ enable nop nop nop return _ enable nop nop nop goto breceive nop nop nop goto bsend nop nop nop return _ enable nop nop nop return _ enable nop nop return _ enable nop nop nop dgoto #0e4h nop nop .space 24*16 ;00; RESET * DO NOT MODIFY IF USING DEBUGGER * ;04; non-maskable external interrupt ;08; trap2 * DO NOT MODIFY IF USING DEBUGGER * ;0C-3F: vectors for software interrupts 18-30 ;40; external interrupt int0 ;44; external interrupt int1 ;48; external interrupt int2 ;4C; internal timer interrupt ;50; BSP receive interrupt ;54; BSP transmit interrupt ;58; TDM receive interrupt ;5C; TDM transmit interrupt ;60; external interrupt int3 ;64; HPIint * DO NOT MODIFY IF USING DEBUGGER * ;68-7F; reserved area 1403fc For more information www.linear.com/LTC1403 19 LTC1403/LTC1403A Package Description Please refer to http://www.linear.com/product/LTC1403#packaging for the most recent package drawings. MSE Package 10-Lead Plastic MSOP, Exposed Die Pad MSE Package (Reference LTC DWG # 05-08-1664 Rev I) 10-Lead Plastic MSOP, Exposed Die Pad (Reference LTC DWG # 05-08-1664 Rev I) BOTTOM VIEW OF EXPOSED PAD OPTION 1.88 0.102 (.074 .004) 5.10 (.201) MIN 1.68 0.102 (.066 .004) 0.05 REF 10 0.305 0.038 (.0120 .0015) TYP RECOMMENDED SOLDER PAD LAYOUT 3.00 0.102 (.118 .004) (NOTE 3) DETAIL "B" CORNER TAIL IS PART OF DETAIL "B" THE LEADFRAME FEATURE. FOR REFERENCE ONLY NO MEASUREMENT PURPOSE 10 9 8 7 6 DETAIL "A" 0 - 6 TYP 1 2 3 4 5 GAUGE PLANE 0.53 0.152 (.021 .006) DETAIL "A" 0.18 (.007) SEATING PLANE 0.86 (.034) REF 1.10 (.043) MAX 0.17 - 0.27 (.007 - .011) TYP 0.50 (.0197) BSC NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 6. EXPOSED PAD DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH ON E-PAD SHALL NOT EXCEED 0.254mm (.010") PER SIDE. 20 0.497 0.076 (.0196 .003) REF 3.00 0.102 (.118 .004) (NOTE 4) 4.90 0.152 (.193 .006) 0.254 (.010) 0.29 REF 1.68 (.066) 3.20 - 3.45 (.126 - .136) 0.50 (.0197) BSC 1.88 (.074) 1 0.889 0.127 (.035 .005) 0.1016 0.0508 (.004 .002) MSOP (MSE) 0213 REV I 1403fc For more information www.linear.com/LTC1403 LTC1403/LTC1403A Revision History (Revision history begins at Rev C) REV DATE DESCRIPTION C 02/17 Updated Timing Characteristics Including tCONV Minimum Conversion Time of 17 Clocks PAGE NUMBER 5, 9, 14, 15 1403fc Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. For more information www.linear.com/LTC1403 21 LTC1403/LTC1403A Related Parts PART NUMBER DESCRIPTION COMMENTS LTC1608 16-Bit, 500ksps Parallel ADC 5V Supply, 2.5V Span, 90dB SINAD LTC1604 16-Bit, 333ksps Parallel ADC 5V Supply, 2.5V Span, 90dB SINAD LTC1609 16-Bit, 250ksps Serial ADC 5V, Configurable Bipolar/Unipolar Inputs LTC1411 14-Bit, 2.5Msps Parallel ADC 5V, Selectable Spans, 80dB SINAD LTC1414 14-Bit, 2.2Msps Parallel ADC 5V Supply, 2.5V Span, 78dB SINAD LTC1407/LTC1407A 12-/14-Bit, 3Msps Simultaneous Sampling ADC 3V, 2-Channel Differential, 14mW, MSOP Package LTC1420 12-Bit, 10Msps Parallel ADC 5V, Selectable Spans, 72dB SINAD LTC1405 12-Bit, 5Msps Parallel ADC 5V, Selectable Spans, 115mW LTC1412 12-Bit, 3Msps Parallel ADC 5V Supply, 2.5V Span, 72dB SINAD LTC1402 12-Bit, 2.2Msps Serial ADC 5V or 5V Supply, 4.096V or 2.5V Span LTC1864/LTC1865 16-Bit, 250ksps Serial ADC 5V Supply, 1 and 2 Channel, 4.3mW, MSOP Package ADCs DACs LTC1666/LTC1667/LTC1668 12-/14-/16-Bit, 50Msps DACs 87dB SFDR, 20ns Settling Time 16-Bit, Serial SoftSpanTM IOUT DAC 1LSB INL/DNL, Software Selectable Spans LT(R)1790-2.5 Micropower Series Reference in SOT-23 0.05% Initial Accuracy, 10ppm Drift LT1461-2.5 Precision Voltage Reference 0.04% Initial Accuracy, 3ppm Drift LT1460-2.5 Micropower Series Voltage Reference 0.1% Initial Accuracy, 10ppm Drift LTC1592 References 22 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 For more information www.linear.com/LTC1403 (408) 432-1900 l FAX: (408) 434-0507 l www.linear.com/LTC1403 1403fc LT 0217 REV C * PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2007