Confidential Draft 3/11/08 CS5341 105 dB, 192 kHz, Multi-Bit Audio A/D Converter Features General Description Advanced Multi-bit Delta-Sigma Architecture The CS5341 is a complete analog-to-digital converter for digital audio systems. It performs sampling, analogto-digital conversion, and anti-alias filtering, generating 24-bit values for both left and right inputs in serial form at sample rates up to 200 kHz per channel. 24-bit Conversion Supports All Audio Sample Rates Including 192 kHz The CS5341 uses a 5th-order, multi-bit Delta-Sigma modulator followed by digital filtering and decimation, which removes the need for an external anti-alias filter. 105 dB Dynamic Range at 5 V -98 dB THD+N 90 mW Power Consumption High-Pass Filter to Remove DC Offsets Analog/Digital Core Supplies from 3.3 V to 5 V Supports Logic Levels between 1.8 V and 5 V Auto-Detect Mode Selection in Slave Mode The CS5341 is available in a 16-pin TSSOP package for Commercial (-10 to +70 C) and Automotive grades (-40 to +85 C). The CDB5341 Customer Demonstration Board is also available for device evaluation and implementation suggestions. Please refer to "Ordering Information" on page 22 for complete ordering information. The CS5341 is ideal for audio systems requiring wide dynamic range, negligible distortion and low noise, such as set-top boxes, DVD-karaoke players, DVD recorders, A/V receivers, and automotive applications. Auto-Detect MCLK Divider VA 3.3 V to 5 V Single-Ended Analog Input AINL VD 3.3 V to 5 V Switch-Cap ADC VL 1.8 V to 5 V Auto-detect MCLK Divider Low-Latency Digital Filters Master Clock FILT+ VQ Serial Port High-Pass Filter Internal Reference Voltages SCLK Slave Mode Auto-detect LRCK SDOUT M0 M1 Single-Ended Analog Input AINR Switch-Cap ADC http://www.cirrus.com High-Pass Filter Low-Latency Digital Filters Copyright (c) Cirrus Logic, Inc. 2008 (All Rights Reserved) Mode Configuration Reset March '08 DS564F2 Confidential Draft 3/11/08 CS5341 TABLE OF CONTENTS 1. CHARACTERISTICS AND SPECIFICATIONS ...................................................................................... 4 SPECIFIED OPERATING CONDITIONS ............................................................................................... 4 ABSOLUTE MAXIMUM RATINGS ......................................................................................................... 4 ANALOG CHARACTERISTICS - COMMERCIAL GRADE .................................................................... 5 ANALOG CHARACTERISTICS - AUTOMOTIVE GRADE ..................................................................... 6 DIGITAL FILTER CHARACTERISTICS ................................................................................................. 7 DC ELECTRICAL CHARACTERISTICS .............................................................................................. 10 DIGITAL CHARACTERISTICS ............................................................................................................. 10 SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT ............................................................... 11 2. PIN DESCRIPTION .............................................................................................................................. 13 3. TYPICAL CONNECTION DIAGRAM ................................................................................................... 14 4. APPLICATIONS ................................................................................................................................... 15 4.1 Single-, Double-, and Quad-Speed Modes ..................................................................................... 15 4.2 Operation as Either a Clock Master or Slave ................................................................................. 15 4.2.1 Operation as a Clock Master ................................................................................................. 16 4.2.2 Operation as a Clock Slave with Auto-Detect ....................................................................... 16 4.2.3 Master Clock ......................................................................................................................... 17 4.3 Serial Audio Interface ..................................................................................................................... 17 4.4 Power-Up Sequence ...................................................................................................................... 18 4.5 Analog Connections ....................................................................................................................... 18 4.6 Grounding and Power Supply Decoupling ...................................................................................... 18 4.7 Synchronization of Multiple Devices ............................................................................................... 18 4.8 Capacitor Size on the Reference Pin (FILT+) ................................................................................ 19 5. PARAMETER DEFINITIONS ................................................................................................................ 20 6. PACKAGE DIMENSIONS ................................................................................................................... 21 THERMAL CHARACTERISTICS .......................................................................................................... 21 7. ORDERING INFORMATION ................................................................................................................ 22 8. REVISION HISTORY ............................................................................................................................ 22 2 DS564F2 Confidential Draft 3/11/08 CS5341 LIST OF FIGURES Figure 1.Single-Speed Mode Stopband Rejection ...................................................................................... 8 Figure 2.Single-Speed Mode Stopband Rejection ...................................................................................... 8 Figure 3.Single-Speed Mode Transition Band (Detail) ................................................................................ 8 Figure 4.Single-Speed Mode Passband Ripple .......................................................................................... 8 Figure 5.Double-Speed Mode Stopband Rejection ..................................................................................... 8 Figure 6.Double-Speed Mode Stopband Rejection ..................................................................................... 8 Figure 7.Double-Speed Mode Transition Band (Detail) .............................................................................. 9 Figure 8.Double-Speed Mode Passband Ripple ......................................................................................... 9 Figure 9.Quad-Speed Mode Stopband Rejection ....................................................................................... 9 Figure 10.Quad-Speed Mode Stopband Rejection ..................................................................................... 9 Figure 11.Quad-Speed Mode Transition Band (Detail) ............................................................................... 9 Figure 12.Quad-Speed Mode Passband Ripple ......................................................................................... 9 Figure 13.Master Mode, Left-Justified SAI ................................................................................................ 12 Figure 14.Slave Mode, Left-Justified SAI .................................................................................................. 12 Figure 15.Master Mode, IS SAI ................................................................................................................ 12 Figure 16.Slave Mode, IS SAI .................................................................................................................. 12 Figure 17.Typical Connection Diagram ..................................................................................................... 14 Figure 18.CS5341 Master Mode Clocking ................................................................................................ 16 Figure 19.IS Serial Audio Interface .......................................................................................................... 17 Figure 20.Left-Justified Serial Audio Interface .......................................................................................... 17 Figure 21.CS5341 Recommended Analog Input Buffer ............................................................................ 18 Figure 22.CS5341 THD+N versus Frequency .......................................................................................... 19 LIST OF TABLES Table 1. Speed Modes and the Associated Output Sample Rates (Fs) .................................................... 15 Table 2. CS5341 Mode Control ................................................................................................................. 15 Table 3. Master Clock (MCLK) Ratios ....................................................................................................... 17 Table 4. Master Clock (MCLK) Frequencies for Standard Audio Sample Rates ...................................... 17 DS564F2 3 Confidential Draft 3/11/08 CS5341 1. CHARACTERISTICS AND SPECIFICATIONS (All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. Typical performance characteristics and specifications are derived from measurements taken at typical supply voltages and TA = 25C.) SPECIFIED OPERATING CONDITIONS (GND = 0 V, all voltages with respect to 0 V.) Parameter Power Supplies Ambient Operating Temperature Symbol Min Typ Max Unit Analog Digital Logic VA VD VL 3.1 3.1 1.7 (Note 1) 3.3 3.3 5.25 5.25 5.25 V V V Commercial Automotive TAC TAC -10 -40 - 70 85 C C Notes: 1. This part is specified at typical analog voltages of 3.3 V and 5.0 V. See Analog Characteristics - Commercial Grade and Analog Characteristics - Automotive Grade, below, for details. ABSOLUTE MAXIMUM RATINGS (GND = 0 V, All voltages with respect to ground.) (Note 2) Parameter Symbol Min Max Units Analog Logic Digital VA VL VD -0.3 -0.3 -0.3 +6.0 +6.0 +6.0 V V V Input Current (Note 3) Iin -10 +10 mA Analog Input Voltage (Note 4) VIN GND-0.7 VA+0.7 V Digital Input Voltage (Note 4) VIND -0.7 VL+0.7 V DC Power Supplies: Ambient Operating Temperature (Power Applied) Storage Temperature TA -50 +95 C Tstg -65 +150 C 2. Operation beyond these limits may result in permanent damage to the device. Normal operation is not guaranteed at these extremes. 3. Any pin except supplies. Transient currents of up to 100 mA on the analog input pins will not cause SRC latch-up. 4. The maximum over/under voltage is limited by the input current. 4 DS564F2 Confidential Draft 3/11/08 CS5341 ANALOG CHARACTERISTICS - COMMERCIAL GRADE Test Conditions (unless otherwise specified): Input test signal is a 1 kHz sine wave; measurement bandwidth is 10 Hz to 20 kHz. Dynamic Performance for Commercial Grade Single-Speed Mode Fs = 48 kHz Dynamic Range A-weighted unweighted Total Harmonic Distortion + Noise Double-Speed Mode Dynamic Range (Note 5) -1 dB -20 dB -60 dB Fs = 96 kHz 40 kHz bandwidth Quad-Speed Mode (Note 5) -1 dB -20 dB -60 dB -1 dB Fs = 192 kHz Symbol 40 kHz bandwidth (Note 5) -1 dB -20 dB -60 dB -1 dB Min Typ Max Min Typ Max Unit 99 96 105 102 - 96 93 102 99 - dB dB - -98 -82 -42 -92 - - -95 -79 -39 -89 - dB dB dB Min Typ Max Min Typ Max Unit 99 96 - 105 102 99 - 96 93 - 102 99 96 - dB dB dB - -98 -82 -42 -95 -92 - - -95 -79 -39 -87 -89 - dB dB dB dB Min Typ Max Min Typ Max Unit 99 96 - 105 102 99 - 96 93 - 102 99 96 - dB dB dB - -98 -82 -42 -95 -92 - - -95 -79 -39 -87 -89 - dB dB dB dB THD+N Symbol A-weighted unweighted 40 kHz bandwidth unweighted Total Harmonic Distortion + Noise VA = 3.3 V THD+N A-weighted unweighted 40 kHz bandwidth unweighted Total Harmonic Distortion + Noise Dynamic Range Symbol VA = 5 V THD+N Min Typ Max Unit - 90 - dB Interchannel Gain Mismatch - 0.1 - dB Gain Error -5 - +5 % Gain Drift - 100 - ppm/C 0.53*VA 0.56*VA 0.59*VA Vpp - 25 - k Dynamic Performance All Modes Interchannel Isolation DC Accuracy Analog Input Characteristics Full-Scale Input Voltage Input Impedance 5. Referred to the typical full-scale input voltage DS564F2 5 Confidential Draft 3/11/08 CS5341 ANALOG CHARACTERISTICS - AUTOMOTIVE GRADE Test Conditions (unless otherwise specified): Input test signal is a 1 kHz sine wave; measurement bandwidth is 10 Hz to 20 kHz. Dynamic Performance for Automotive Grade Single-Speed Mode Fs = 48 kHz Dynamic Range A-weighted unweighted Total Harmonic Distortion + Noise Double-Speed Mode Dynamic Range (Note 6) -1 dB -20 dB -60 dB Fs = 96 kHz 40 kHz bandwidth Quad-Speed Mode (Note 6) -1 dB -20 dB -60 dB -1 dB Fs = 192 kHz Symbol 40 kHz bandwidth (Note 6) -1 dB -20 dB -60 dB -1 dB Min Typ Max Min Typ Max Unit 97 94 105 102 - 94 91 102 99 - dB dB - -98 -82 -42 -90 - - -95 -79 -39 -87 - dB dB dB Min Typ Max Min Typ Max Unit 97 94 - 105 102 99 - 94 91 - 102 99 96 - dB dB dB - -98 -82 -42 -95 -90 - - -95 -79 -39 -87 -87 - dB dB dB dB Min Typ Max Min Typ Max Unit 97 94 - 105 102 99 - 94 91 - 102 99 96 - dB dB dB - -98 -82 -42 -95 -90 - - -95 -79 -39 -87 -87 - dB dB dB dB THD+N Symbol A-weighted unweighted 40 kHz bandwidth unweighted Total Harmonic Distortion + Noise VA = 3.3 V THD+N A-weighted unweighted 40 kHz bandwidth unweighted Total Harmonic Distortion + Noise Dynamic Range Symbol VA = 5 V THD+N Min Typ Max Unit - 90 - dB - 0.1 - dB Gain Error -10 - +10 % Gain Drift - 100 - ppm/C 0.50*VA 0.56*VA 0.62*VA Vpp - 25 - k Dynamic Performance All Modes Interchannel Isolation DC Accuracy Interchannel Gain Mismatch Analog Input Characteristics Full-Scale Input Voltage Input Impedance 6. Referred to the typical full-scale input voltage 6 DS564F2 Confidential Draft 3/11/08 CS5341 DIGITAL FILTER CHARACTERISTICS Parameter Symbol Min Typ Max Unit (Note 7) 0 - 0.4895 Fs -0.035 - 0.035 dB (Note 7) 0.5687 - - Fs 70 - - dB - 12/Fs - s (Note 7) 0 - 0.4895 Fs -0.025 - 0.025 dB (Note 7) 0.5604 - - Fs 69 - - dB - 9/Fs - s 0 - 0.2604 Fs -0.025 - 0.025 dB Single-Speed Mode Passband (-0.1 dB) Passband Ripple Stopband Stopband Attenuation Total Group Delay (Fs = Output Sample Rate) tgd Double-Speed Mode Passband (-0.1 dB) Passband Ripple Stopband Stopband Attenuation Total Group Delay (Fs = Output Sample Rate) tgd Quad-Speed Mode Passband (-0.1 dB) (Note 7) Passband Ripple Stopband (Note 7) Stopband Attenuation Total Group Delay (Fs = Output Sample Rate) tgd 0.5 - - Fs 60 - - dB - 5/Fs - s - 1 20 - Hz Hz - 10 - Deg - - 0 dB High-Pass Filter Characteristics Frequency Response Phase Deviation -3.0 dB -0.13 dB (Note 8) @ 20 Hz (Note 8) Passband Ripple 7. Filter characteristics scale precisely with Fs 8. Response shown is for Fs equal to 48 kHz. Filter characteristics scale with Fs. DS564F2 7 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 Amplitude (dB) Amplitude (dB) Confidential Draft 3/11/08 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 0.40 0.42 0.44 0 0.10 -1 0.08 -2 0.06 -3 -4 -5 -6 -7 0.56 0.58 0.60 0.02 0.00 -0.02 -0.04 -0.06 -9 -0.08 -0.10 0.46 0.47 0.48 0.49 0.5 0.51 0.52 0.53 0.54 0 0.55 Amplitude (dB) 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 Figure 4. Single-Speed Mode Passband Ripple 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 0.1 0.05 Frequency (norm alized to Fs) Figure 3. Single-Speed Mode Transition Band (Detail) Amplitude (dB) 0.54 0.04 -8 Frequency (norm alized to Fs) 0.9 1.0 Frequency (norm alized to Fs) Figure 5. Double-Speed Mode Stopband Rejection 8 0.52 Figure 2. Single-Speed Mode Stopband Rejection Amplitude (dB) Amplitude (dB) Figure 1. Single-Speed Mode Stopband Rejection 0.0 0.46 0.48 0.50 Frequency (norm alized to Fs) Frequency (norm alized to Fs) -10 0.45 CS5341 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 0.40 0.42 0.44 0.46 0.48 0.50 0.52 0.54 0.56 0.58 0.60 Frequency (norm alized to Fs) Figure 6. Double-Speed Mode Stopband Rejection DS564F2 0 0.10 -1 0.08 -2 0.06 Amplitude (dB) Amplitude (dB) Confidential Draft 3/11/08 -3 -4 -5 -6 -7 0.04 0.02 0.00 -0.02 -0.04 -8 -0.06 -9 -0.08 -10 0.46 0.47 0.48 0.49 0.50 0.51 -0.10 0.00 0.05 0.52 Frequency (norm alized to Fs) 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Figure 8. Double-Speed Mode Passband Ripple Amplitude (dB) Amplitude (dB) 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 0.1 0.10 Frequency (norm alized to Fs) Figure 7. Double-Speed Mode Transition Band (Detail) 0.0 CS5341 0.9 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 1.0 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 Frequency (norm alized to Fs) Frequency (norm alized to Fs) Figure 9. Quad-Speed Mode Stopband Rejection Figure 10. Quad-Speed Mode Stopband Rejection 0 0.10 -1 0.08 0.06 -3 Amplitude (dB) Amplitude (dB) -2 -4 -5 -6 -7 -8 0.00 -0.02 -0.04 -0.08 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Frequency (norm alized to Fs) Figure 11. Quad-Speed Mode Transition Band (Detail) DS564F2 0.02 -0.06 -9 -10 0.10 0.04 -0.10 0.00 0.03 0.05 0.08 0.10 0.13 0.15 0.18 0.20 0.23 0.25 0.28 Frequency (norm alized to Fs) Figure 12. Quad-Speed Mode Passband Ripple 9 Confidential Draft 3/11/08 CS5341 DC ELECTRICAL CHARACTERISTICS (GND = 0 V, all voltages with respect to 0 V. MCLK=12.288 MHz; Master Mode) Parameter Symbol Min Typ Max Unit Positive Analog Positive Digital Positive Logic VA VD VL 3.1 3.1 1.7 - 5.25 5.25 5.25 V V V VA = 5 V VA = 3.3 V VL,VD = 5 V VL,VD = 3.3 V IA IA ID ID - 21 18.2 15 9 25.5 22.5 18.5 10 mA mA mA mA VA = 5 V VL,VD=5 V IA ID - 1.5 0.4 - mA mA VL, VD, VA = 5 V VL, VD, VA = 3.3 V (Power-Down Mode) - - 180 90 9.5 220 107.2 - mW mW mW PSRR - 65 - dB VQ Nominal Voltage Output Impedance - VA/2 25 - V k Filt+ Nominal Voltage Output Impedance Maximum allowable DC current source/sink - VA 36 0.01 - V k mA DC Power Supplies: Power Supply Current (Normal Operation) Power Supply Current (Power-Down Mode) (Note 9) Power Consumption (Normal Operation) Power Supply Rejection Ratio (1 kHz) (Note 10) 9. Power-Down Mode is defined as RST = Low, with all clocks and data lines held static at a valid logic levels. 10. Valid with the recommended capacitor values on FILT+ and VQ as shown in the Typical Connection Diagram. DIGITAL CHARACTERISTICS Parameter Symbol Min Typ Max Units High-Level Input Voltage (% of VL) VIH 70% - - V Low-Level Input Voltage (% of VL) VIL - - 30% V High-Level Output Voltage at Io = 100 A (% of VL) VOH 70% - - V Low-Level Output Voltage at Io =100 A (% of VL) VOL - - 15% V Iin -10 - +10 A Input Leakage Current 10 DS564F2 Confidential Draft 3/11/08 CS5341 SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT (Logic "0" = GND = 0 V; Logic "1" = VL, CL = 20 pF) Parameter Symbol Min Typ Max Unit tclkw 39 - 45 ns 78 - 1953 ns 40 - 60 % -20 - 20 ns Double-Speed -20 - 20 ns Quad-Speed -8 - 8 ns - - 32 ns MCLK Specifications MCLK Period MCLK Pulse Duty Cycle Master Mode SCLK falling to LRCK Single-Speed SCLK falling to SDOUT valid. SCLK Duty Cycle. tmslr tsdo Single-Speed - 50 - % Double-Speed - 50 - % Quad-Speed - 33 - % 40 50 60 % 156 - - ns 45 50 55 % Slave Mode Single-Speed (Note 11) LRCK Duty Cycle SCLK Period tsclkw SCLK Duty Cycle SDOUT valid before SCLK rising tstp 10 - - ns SDOUT valid after SCLK rising thld 5 - - ns SCLK falling to LRCK edge tslrd -20 - 20 ns 40 50 60 % 156 - - ns 45 50 55 % Double-Speed (Note 11) LRCK Duty Cycle SCLK Period tsclkw SCLK Duty Cycle SDOUT valid before SCLK rising tstp 10 - - ns SDOUT valid after SCLK rising thld 5 - - ns SCLK falling to LRCK edge. tslrd -20 - 20 ns 40 50 60 % 78 - - ns 29.7 33 50 % Quad-Speed (Note 11) LRCK Duty Cycle SCLK Period tsclkw SCLK Duty Cycle SDOUT valid before SCLK rising tstp 10 - - ns SDOUT valid after SCLK rising thld 5 - - ns SCLK falling to LRCK edge. tslrd -8 - 8 ns 11. For a description of speed modes, please refer to Table on page 15. DS564F2 11 Confidential Draft 3/11/08 SCLK output CS5341 LRCK input t mslr t sclkw t slrd SCLK input LRCK output t stp thld t sdo MSB S DOUT MSB-1 Figure 13. Master Mode, Left-Justified SAI SDOUT MSB MSB-1 Figure 14. Slave Mode, Left-Justified SAI SCLK output LRCK input t mslr t slrd LRCK output tsclkw SCLK input t sdo MSB S DOUT Figure 15. Master Mode, IS SAI 12 t stp thld SDOUT MSB Figure 16. Slave Mode, IS SAI DS564F2 Confidential Draft 3/11/08 CS5341 2. PIN DESCRIPTION M0 MCLK VL SDOUT GND VD SCLK LRCK Pin Name 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 M1 FILT+ REF_GND VA AINR VQ AINL RST # Pin Description M0 M1 1 16 Mode Selection (Input) - Determines the operational mode of the device. MCLK 2 Master Clock (Input) - Clock source for the delta-sigma modulator and digital filters. VL 3 Logic Power (Input) - Positive power for the digital input/output. SDOUT 4 Serial Audio Data Output (Output) - Output for two's complement serial audio data. GND 5,14 Ground (Input) - Ground reference. Must be connected to analog ground. VD 6 Digital Power (Input) - Positive power supply for the digital section. SCLK 7 Serial Clock (Input/Output) - Serial clock for the serial audio interface. LRCK 8 Left Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the serial audio data line. RST 9 Reset (Input) - The device enters a low power mode when low. AINL AINR 10 12 Analog Input (Input) - The full-scale analog input level is specified in the Analog Characteristics specification table. VQ 11 Quiescent Voltage (Output) - Filter connection for the internal quiescent reference voltage. VA 13 Analog Power (Input) - Positive power supply for the analog section. FILT+ 15 Positive Voltage Reference (Output) - Positive reference voltage for the internal sampling circuits. DS564F2 13 Confidential Draft 3/11/08 CS5341 3. TYPICAL CONNECTION DIAGRAM 3.3V to 5V + 1 F 0.1 F 0.1 F + 1 F 1.8 V to 5V ** 3.3V to 5V + 1 F 5.1 0.1 F VA 0.1 F VD VL FILT+ *** + 1 F 0.1 F REFGND + 1F 0.1 F VQ CS5341 RST M0 M1 Power Down and Mode Settings VL or GND A/D CONVERTER 10k AINL SDOUT Analog Input Buffer Figure 21 * Audio Data Processor AINR MCLK LRCK Timing Logic and Clock SCLK GND 14 *** Capacitor value affects * Pull-up to VL for I2S Pull-down to GND for LJ low frequency distortion performance as described ** Resistor may only be in Section 4.8 used if VD is derived from VA. If used, do not drive any other logic from VD DS564F2 Confidential Draft 3/11/08 CS5341 4. APPLICATIONS 4.1 Single-, Double-, and Quad-Speed Modes The CS5341 can support output sample rates from 2 kHz to 200 kHz. The proper speed mode can be determined by the desired output sample rate and the external MCLK/LRCK ratio, as shown in Table 1. Speed Mode MCLK/LRCK Ratio Output Sample Rate Range (kHz) 512x 43 - 50 Single-Speed Mode Double-Speed Mode Quad-Speed Mode 256x 2 - 50 256x 86 - 100 128x 4 - 100 128x 172 - 200 64x* 100 - 200 * Quad-Speed Mode, 64x only available in Master Mode. Table 1. Speed Modes and the Associated Output Sample Rates (Fs) 4.2 Operation as Either a Clock Master or Slave The CS5341 supports operation as either a clock master or slave. As a clock master, the LRCK and SCLK pins are outputs with the left/right and serial clocks synchronously generated on-chip. As a clock slave, the LRCK and SCLK pins are inputs and require the left/right and serial clocks to be externally generated. The selection of clock master or slave is made via the Mode pins as shown in Table 2. M1 (Pin 16) 0 0 1 1 M0 (Pin 1) 0 1 0 1 MODE Clock Master, Single-Speed Mode Clock Master, Double-Speed Mode Clock Master, Quad-Speed Mode Clock Slave, All Speed Modes Table 2. CS5341 Mode Control DS564F2 15 Confidential Draft 3/11/08 4.2.1 CS5341 Operation as a Clock Master As a clock master, LRCK and SCLK operate as outputs. The left/right and serial clocks are internally derived from the master clock with the left/right clock equal to Fs and the serial clock equal to 64x Fs, as shown in Figure 18. /1 / 256 Single Speed 00 / 128 Double Speed 01 / 64 Quad Speed 10 0 M1 MCLK /2 LRCK Output (Equal to Fs) M0 1 Auto-Select /4 Single Speed 00 /2 Double Speed 01 /1 Quad Speed 10 SCLK Output Figure 18. CS5341 Master Mode Clocking 4.2.2 Operation as a Clock Slave with Auto-Detect LRCK and SCLK operate as inputs in clock Slave Mode. It is recommended that the left/right clock be synchronously derived from the master clock and must be equal to Fs. It is also recommended that the serial clock be synchronously derived from the master clock and be equal to 64x Fs to maximize system performance. A unique feature of the CS5341 is the automatic selection of either Single-, Double- or Quad-Speed Mode when operating as a clock slave. The auto-mode select feature negates the need to configure the Mode pins to correspond to the desired mode. The auto-mode selection feature supports all standard audio sample rates from 2 to 200 kHz. However, there are ranges of non-standard audio sample rates that are not supported when operating with a fast MCLK (512x, 256x, 128x for Single-, Double-, and Quad-Speed Modes, respectively). Please refer to Table for supported sample rate ranges. 16 DS564F2 Confidential Draft 3/11/08 4.2.3 CS5341 Master Clock The CS5341 requires a Master clock (MCLK) which runs the internal sampling circuits and digital filters. There is also an internal MCLK divider which is automatically activated based on the speed mode and frequency of the MCLK. Table 3 shows a listing of the external MCLK/LRCK ratios that are required. Table 4 lists some common audio output sample rates and the required MCLK frequency. Please note that not all of the listed sample rates are supported when operating with a fast MCLK (512x, 256x, 128x for Single-, Double-, and Quad-Speed Modes, respectively). Single-Speed Mode Double-Speed Mode Quad-Speed Mode 256x, 512x 128x, 256x 64x*,128x MCLK/LRCK Ratio * Quad Speed, 64x only available in Master Mode. Table 3. Master Clock (MCLK) Ratios SAMPLE RATE (kHz) MCLK (MHz) 32 44.1 8.192 11.2896 22.5792 12.288 24.576 8.192 11.2896 22.5792 12.288 24.576 12.288 24.576 48 64 88.2 96 192 Table 4. Master Clock (MCLK) Frequencies for Standard Audio Sample Rates 4.3 Serial Audio Interface The CS5341 supports both IS and Left-Justified serial audio formats. Upon start-up, the CS5341 will detect the logic level on SDOUT (pin 4). A 10 k pull-up to VL is needed to select IS format, and a 10 k pulldown to GND is needed to select Left-Justified format. Figures 19 and 20 illustrate the IS and Left-Justified audio formats. Please see Figures 13 through 16, for more information on the required timing for the two serial audio interface formats. Also see Application Note AN282 for a detailed discussion of the serial audio interface formats. LR C K L e ft C h a n n e l R ig h t C h a n n e l S C LK SD ATA 23 22 9 8 7 6 5 4 3 2 1 0 23 22 9 8 7 6 5 4 3 2 1 0 23 22 Figure 19. IS Serial Audio Interface LR C K L e ft C h an n e l R ig h t C h a n n e l SC LK SD ATA 23 22 9 8 7 6 5 4 3 2 1 0 23 22 9 8 7 6 5 4 3 2 1 0 23 2 2 Figure 20. Left-Justified Serial Audio Interface DS564F2 17 Confidential Draft 3/11/08 4.4 CS5341 Power-Up Sequence Reliable power-up can be accomplished by keeping the device in reset until the power supplies, clocks and configuration pins are stable. It is also recommended that reset be enabled if the analog or digital supplies drop below the minimum specified operating voltages to prevent power-glitch-related issues. 4.5 Analog Connections The analog modulator samples the input at half of the MCLK frequency, or nominally 6.144 MHz. The digital filter will reject signals within the stopband of the filter. However, there is no rejection for input signals which are multiples of the input sampling frequency (n x 6.144 MHz), where n=0,1,2,... Refer to Figure 21, which shows the suggested filter that will attenuate any noise energy at 6.144 MHz in addition to providing the optimum source impedance for the modulators. The use of capacitors that have a large voltage coefficient (such as general-purpose ceramics) must be avoided since these can degrade signal linearity. 634 VA 100 k 470 pF C 0G 4.7 F 91 C S 5341 A IN x A IN x 2700 pF 100 k Figure 21. CS5341 Recommended Analog Input Buffer 4.6 Grounding and Power Supply Decoupling As with any high resolution converter, achieving optimal performance from the CS5341 requires careful attention to power supply and grounding arrangements. Figure 17 shows the recommended power arrangements, with VA and VL connected to clean supplies. VD, which powers the digital filter, may be run from the system logic supply or may be powered from the analog supply via a resistor. In this case, no additional devices should be powered from VD. Decoupling capacitors should be as near to the ADC as possible, with the low-value ceramic capacitor being the nearest. All signals, especially clocks, should be kept away from the FILT+ and VQ pins in order to avoid unwanted coupling into the modulators. The FILT+ and VQ decoupling capacitors, particularly the 0.01 F, must be positioned to minimize the electrical path from FILT+ and REF_GND. Furthermore, all ground pins on CS5341 should be referenced to the same ground reference. The CDB5341 evaluation board demonstrates the optimum layout and power supply arrangements. To minimize digital noise, connect the ADC digital outputs only to CMOS inputs. 4.7 Synchronization of Multiple Devices In systems where multiple ADCs are required, the user can achieve simultaneous sampling if the MCLK and LRCK signals are the same for all of the CS5341's in the system. If only one master clock source is needed, one solution is to place one CS5341 in Master Mode, and slave all of the other CS5341's to the one master. If multiple master clock sources are needed, a possible solution would be to supply all clocks from the same external source and time the CS5341 reset with the inactive (falling) edge of MCLK. This will ensure that all converters begin sampling on the same clock edge. 18 DS564F2 Confidential Draft 3/11/08 4.8 CS5341 Capacitor Size on the Reference Pin (FILT+) The CS5341 requires an external capacitance on the internal reference voltage pin, FILT+. The size of this decoupling capacitor will affect the low frequency distortion performance as shown in Figure 22, with larger capacitor values used to optimize low frequency distortion performance. This plot was taken using the CDB5341 evaluation platform, with the device running in Single-Speed Mode and VA=VD=VL=5 V. 1 uF 2.2 uF 3.3 uF 4.7 uF 5.6 uF 6.8 uF 10 uF 22 uF 47 uF 100 uF Figure 22. CS5341 THD+N versus Frequency DS564F2 19 Confidential Draft 3/11/08 CS5341 5. PARAMETER DEFINITIONS Dynamic Range The ratio of the rms value of the signal to the rms sum of all other spectral components over the specified bandwidth. Dynamic Range is a signal-to-noise ratio measurement over the specified bandwidth made with a -60 dBFS signal. 60 dB is added to resulting measurement to refer the measurement to full-scale. This technique ensures that the distortion components are below the noise level and do not affect the measurement. This measurement technique has been accepted by the Audio Engineering Society, AES17-1991, and the Electronic Industries Association of Japan, EIAJ CP-307. Expressed in decibels. Total Harmonic Distortion + Noise The ratio of the rms value of the signal to the rms sum of all other spectral components over the specified bandwidth (typically 10 Hz to 20 kHz), including distortion components. Expressed in decibels. Measured at -1 and -20 dBFS as suggested in AES17-1991 Annex A. Frequency Response A measure of the amplitude response variation from 10 Hz to 20 kHz relative to the amplitude response at 1 kHz. Units in decibels. Interchannel Isolation A measure of crosstalk between the left and right channels. Measured for each channel at the converter's output with no signal to the input under test and a full-scale signal applied to the other channel. Units in decibels. Interchannel Gain Mismatch The gain difference between left and right channels. Units in decibels. Gain Error The deviation from the nominal full-scale analog input for a full-scale digital output. Gain Drift The change in gain value with temperature. Units in ppm/C. Offset Error The deviation of the mid-scale transition (111...111 to 000...000) from the ideal. Units in mV. 20 DS564F2 Confidential Draft 3/11/08 CS5341 6. PACKAGE DIMENSIONS 16L TSSOP (4.4 mm BODY) PACKAGE DRAWING N D E11 A2 E A b2 e SIDE VIEW A1 END VIEW L SEATING PLANE 1 2 3 TOP VIEW DIM A A1 A2 b D E E1 e L INCHES NOM -0.004 0.0354 0.0096 0.1969 0.2519 0.1732 0.026 BSC 0.024 4 MIN -0.002 0.03346 0.00748 0.193 0.248 0.169 -0.020 0 MAX 0.043 0.006 0.037 0.012 0.201 0.256 0.177 -0.028 8 MIN -0.05 0.85 0.19 4.90 6.30 4.30 -0.50 0 MILLIMETERS NOM --0.90 0.245 5.00 6.40 4.40 0.65 BSC 0.60 4 NOTE MAX 1.10 0.15 0.95 0.30 5.10 6.50 4.50 -0.70 8 2,3 1 1 JEDEC #: MO-153 Controlling Dimension is Millimeters 1. "D" and "E1" are reference datums and do not included mold flash or protrusions, but do include mold mismatch and are measured at the parting line, mold flash or protrusions shall not exceed 0.20 mm per side. 2. Dimension "b" does not include dambar protrusion/intrusion. Allowable dambar protrusion shall be 0.13 mm total in excess of "b" dimension at maximum material condition. Dambar intrusion shall not reduce dimension "b" by more than 0.07 mm at least material condition. 3. These dimensions apply to the flat section of the lead between 0.10 and 0.25 mm from lead tips. THERMAL CHARACTERISTICS Parameter Symbol Allowable Junction Temperature Junction to Ambient Thermal Impedance DS564F2 JA Min Typ Max Unit - - 135 C - 75 - C/W 21 Confidential Draft 3/11/08 CS5341 7. ORDERING INFORMATION Product Description Package Pb-Free Grade Temp Range Container Bulk 105 dB, 192 kHz, Multi-Bit CS5341 16-TSSOP YES Commercial -10 to +70 C Audio A/D Converter Tape & Reel Bulk 105 dB, 192 kHz, Multi-Bit CS5341 16-TSSOP YES Automotive -40 to +85 C Audio A/D Converter Tape & Reel CDB5341 CS5341 Evaluation Board - Order # CS5341-CZZ CS5341-CZZR CS5341-DZZ CS5341-DZZR CDB5341 8. REVISION HISTORY Release PP2 Changes Add lead-free option to ordering information F1 Remove CS5341-CZ from Ordering Information Redefine Serial Audio Port Switching Characteristics Correct dimension "e" under Package Dimensions Update maximum current and power specifications Update Filt+ output impedance specification F2 Reduced minimum sample rate to 4 kHz for Double-Speed Mode 128x in Table 1 on page 15 Updated Legal Text Contacting Cirrus Logic Support For all product questions and inquiries, contact a Cirrus Logic Sales Representative. To find the one nearest to you, go to www.cirrus.com. IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). 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