(R) (R) ADC-228A 8-Bit, 20MHz, Complete Flash A/D Converter INNOVATION and EXCELLENCE PRELIMINARY PRODUCT DATA FEATURES * * * * * * * 8-Bit flash A/D converter 20MHz sampling rate Complete support circuitry Low power, 900mW Sample-hold not required Three-state outputs MIL-STD-883 versions GENERAL DESCRIPTION The ADC-228A combines analog front-end circuitry and a flash A/D converter to digitize high-speed analog signals at a rate of 20 million samples per second. The ADC-228A contains an 8bit, 20MHz, flash A/D, a wideband analog input buffer, a precision voltage reference, temperature compensation circuitry, reference trims, and a three-state output buffer in a 24-pin package. The ADC-228A offers significant savings by combining all of the circuitry in a single package. Valuable board real estate is saved, and design time and manufacturing costs are reduced. The ADC-228A is housed in a 24-pin ceramic DDIP package and is available in the commercial, 0 to +70C, or military, -55 to +125C, temperature ranges. A MIL-STD-883 version is also available. Operation is from 15V and +5V power supplies. C S 1 N O N O C S C O N N E C T IO C O N N E C T IO C L O C A N A L O G INPUT/OUTPUT CONNECTIONS PIN FUNCTION PIN FUNCTION 1 2 3 4 5 6 7 8 9 10 11 12 +5V SUPPLY GROUND +5V REFERENCE OUT GROUND ANALOG INPUT GROUND GROUND NO CONNECTION NO CONNECTION -15V SUPPLY CS1 CS2 24 23 22 21 20 19 18 17 16 15 14 13 BIT 8 (LSB) BIT 7 BIT 6 BIT 5 NO CONNECTION +15V SUPPLY CLOCK INPUT BIT 4 BIT 3 BIT 2 BIT 1 (MSB) NO CONNECTION 1 1 2 N 1 2 8 N K 9 1 8 IN P U T 5 IN P U T B U F F E R + 1 5 V S U P P L Y 1 9 1 5 V S U P P L Y 1 0 G R O U N D G R O U N D 7 G R O U N D 6 G R O U N D + 5 V S U P P L Y 4 2 1 L IN E A & T E M C O M P N E R IZ P E R E N S T W O A T IO N A T U R E A T IO N R K 8 -B 2 0 M F L A C O N V E IT H z S H R T E R T R I-S T A T E B U F F E R 1 3 N O C O N N E C T IO N 2 0 N O C O N N E C T IO N 1 4 B IT 1 (M S B ) 1 5 1 6 B IT 2 B IT 3 1 7 B IT 4 2 1 B IT 5 2 2 B IT 6 2 3 B IT 7 2 4 B IT 8 (L S B ) 3 + 5 V R E F . O U T V O L T A G E R E F E R E N C E N E T W O R K Figure 1. Functional Block Diagram DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) * Tel: (508) 339-3000 Fax: (508) 339-6356 * For immediate assistance (800) 233-2765 (R) (R) ADC-228A ABSOLUTE MAXIMUM RATINGS PARAMETER LIMITS DYNAMIC PERFORMANCE Power Supply Voltage, Pin 1 Pin 19 Pin 10 Digital Inputs, Pins 8,9,11,12,18 Analog Input, Pin 5 Digital Outputs -0.3 to +7V -0.3 to +18V +0.3 to -18V -0.5 to +5.5V -3.8 to +6.6V -0.5 to +5.5V (short circuit protected to ground) Total Harm. Distortion, -0.5dB DC to 2.5 MHz 2.5 MHz to 5 MHz 5 MHz to 10 MHz Signal-to-Noise Ratio and Distortion, -0.5dB DC to 2.5 MHz 2.5 MHz to 5 MHz 5 MHz to 10 MHz Signal-to-Noise Ratio w/o Distortion, -0.5 dB DC to 2.5 MHz 2.5 MHz to 5 MHz 5 MHz to 10 MHz Effective Bits, -0.5dB DC to 2.5 MHz 2.5 MHz to 5 MHz 5 MHz to 10 MHz Input Bandwidth Large Signal (-3dB) Small Signal (-20dB) Lead Temp. (10 seconds)+300C FUNCTIONAL SPECIFICATIONS (Apply over the operating temperature range with 20MHz clock and 15V and +5V power supply voltages, unless otherwise specified.) ANALOG INPUTS MIN. TYP. MAX. UNITS Single-Ended, Non-Isolated Input Range, dc-20MHz Input Resistance Input Capacitance 0 1.95 -- -- 2 5 +5.0 -- 10 Volts k pF DIGITAL INPUTS Logic Levels Logic 1 Logic 0 Logic Loading Logic 1 Logic 0 Clock Pulse Widths "High" "Low" +2.0 -- -- -- -- +0.8 Volts Volts -- -- -- -- +160 -0.5 A mA 20 20 -- -- -- -- ns ns Power Supply Range +15V Supply -15V Supply +5V Supply Power Supply Current +15V Supply -15V Supply +5V Supply Power Dissipation 15V, +5V Nominal MAX. UNITS -- -- -- -55 -49 -39 -53 -44 -36 dB dB dB 44 41 35 49 46 38 -- -- -- dB dB dB 45 44 42 48 49 45 -- -- -- dB dB dB 7.1 6.8 5.6 7.75 7.4 6.1 -- -- -- Bits Bits Bits 15 40 -- -- -- -- MHz MHz +11 -11 +4.75 +15 -15 +5 +15.75 -15.75 +5.25 Volts Volts Volts -- -- -- +12 -13 +70 +20 -20 +80 mA mA mA -- 0.7 0.9 Watts PHYSICAL/ENVIRONMENTAL Straight Binary 8 Bits +2.4 -- -- -- -- +0.4 Volts Volts -- -- -- -- -1 +1 mA mA -- 6 -- -- 40 -- ns ns 20 -- -- MHz -- 0.5 0.75 LSB -- -- -- -- 0.5 0.35 -- -- 1 0.75 1.75 1 LSB LSB LSB LSB -- -- -- -- -- -- -- -- 0.5 0.5 0.5 0.5 2 1 8 50 1 1.5 1.5 1.5 -- -- -- -- LSB LSB LSB LSB % deg. ns ps Operating Temp. Range, Case ADC-228AMC ADC-228AMM, ADC-228A/883 Storage Temp. Range Package Type Weight Footnotes: At full power input and chip selects enabled. For 10-step, 40 IRE NTSC ramp test. PERFORMANCE Sampling Rate Differential Linearity Code Transitions Integral Linearity, +25C End-point Best-fit Line Over Temperature End-point Best-fit Line Zero-Scale Offset Code "0" to "1" Transition +25C -55 to +125C Gain error Full Scale Absolute Accuracy Differential Gain Differential Phase Aperture Delay Aperture Jitter No Missing Codes Power Supply Rejection TYP. POWER SUPPLY DIGITAL OUTPUTS Coding Resolution Logic Levels Logic 1 Logic 0 Logic Loading Logic 1 Logic 0 Output Data Valid Delay From Rising Edge Output Hold Time MIN. Over the operating temperature range 0.02% FSR/%VS maximum 2 0 to +70C -55 to +125C -65 to +150C 24-pin, ceramic DDIP 0.3 ounces (8.5 grams) (R) (R) ADC-228A TECHNICAL NOTES Table 1. ADC-228A Unipolar Output Coding 1. Rated performance requires using good high-frequency techniques. The analog and digital ground pins are connected to each other internally. Avoid ground related problems by connecting the grounds to one point, the ground plane beneath the converter. Due to the inductance and resistance of the power supply return paths, return the analog and digital ground separately to the power supplies. ANALOG INPUT +4.96V +3.75V +2.50V +1.25V +0.02V 0.00V 2. Bypass all the analog and digital supplies and the +5V REFERENCE (pin 3) to ground with a 4.7F, 25V tantalum electrolytic capacitor in parallel with a 0.1F ceramic capacitor. STRAIGHT BIN. 1111 1110 1100 0000 1000 0000 0100 0000 0000 0001 0000 0000 Table 2. Chip Select Truth Table CS2 Pin 12 0 0 1 1 CS1 Pin 11 0 1 0 1 S A M P L E N + 1 S A M P L E N C L O C K CODE +FS - 1 LSB + 3/4 FS + 1/2 FS + 1/4 FS + 1 LSB ZERO Bits 1-8 Three State Mode Three State Mode Data Outputted Three State Mode S A M P L E N + 2 O U T P U T D E L A Y D A T A N D IG IT A L O U T P U T D A T A N + 2 D A T A N + 1 O U T P U T H O L D T IM E Figure 2. ADC-228A Timing Diagram 1 5 V + 5 V 0 .1 F 4 .7 F 0 .1 F + 1 1 0 + 4 .7 F 1 4 1 5 1 6 1 7 C S 1 2 1 1 1 A D C -2 2 8 A C S 1 1 2 C L O C K 1 8 A N A L O G IN P U T 2 2 2 3 2 4 8 , 9 , 1 3 , 2 0 V 5 1 9 IN 5 3 1 9 9 k 9 * O p tio n a l * U s e o p tio n a l r e s is to r o n ly if a m p is n o t u s e d to d r iv e in p u t. R = V E E /1 .6 6 7 m A B 2 B 3 B 4 B 5 B 6 B 7 B 8 (L S B ) N O + 4 .7 F 4 .7 F + 1 5 V Figure 3. ADC-228A Typical Connections 3 C O N N E C T IO N + 5 V R E F E R E N C E O U T 2 , 4 , 6 , 7 0 .1 F + B 1 (M S B ) 0 .1 F (R) (R) ADC-228A MECHANICAL DIMENSIONS INCHES (mm) 1.31 MAX. (33.27) 24 Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) 0.010 (0.254) 3 place decimal (.XXX) 0.005 (0.127) 13 0.80 MAX. (20.32) 1 Lead Material: Kovar alloy Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating 12 0.100 TYP. (2.540) 1.100 (27.940) 0.235 MAX. (5.969) 0.200 MAX. (5.080) +0.002 0.010 -0.001 (0.254) 0.190 MAX. (4.826) 0.100 (2.540) 0.040 (1.016) 0.018 0.002 (0.457) SEATING PLANE 0.025 (0.635) 0.600 0.010 (15.240) 0.100 (2.540) ORDERING INFORMATION MODEL TEMPERATURE RANGE ADC-228AMC ADC-228AMM ADC-228A/883 * 0 to +70C -55 to +125C -55 to +105C SAMPLING RATE 20MSPS 20MSPS 15MSPS Receptacle for PC board mounting can be ordered through AMP Inc., part # 3-331272-8 (component lead socket), 24 required. Contact DATEL for 883 product specifications * DATEL's initial qualification was done at 15MSPS and as a Mil-STD-883 Class G product per customer request. Mil-STD-883 Class G allows for a reduced temperature range (-55C to +105C) that applies to this device. Contact DATEL if a 20MSPS rate or a Mil-STD-883 Class H (-55C to +125C) temperature range is desired. (R) (R) ISO 9001 INNOVATION and EXCELLENCE R E G I S T E R E D DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 Internet: www.datel.com E-mail:sales@datel.com DS-0513 Preliminary 5/03 DATEL (UK) LTD. Tadley, England Tel: (01256)-880444 DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 1-34-60-01-01 DATEL GmbH Munchen, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-6354-2025 DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.