CS4331

CS4330/31/33 8 Pin Stereo D/A Converter for Digital Audio Features Description The CS4330, CS4331 and CS4333 are complete, stereo digital-to-analog output systems including interpolation, 1-bit D/A conversion and output analog filtering in an 8pin package. These devices differ in the serial interface format used to input audio data. The CS4330, CS4331 and CS4333 are based on deltasigma modulation, where the modulator output controls the reference voltage input to an ultra-linear analog lowpass filter. This architecture allows for infinite adjustment of sample rate between 2 kHz and 50 kHz while maintaining linear phase response simply by changing the master clock frequency. The CS4330, CS4331 and CS4333 contain on-chip digital de-emphasis, operate from a single +3 V or +5 V power supply, and consume only 60mW of power with a 3 V power supply. These features make them ideal for portable CD players and other portable playback systems. ORDERING INFORMATION See page 21. I l Complete Stereo DAC System: Interpolation, D/A, Output Analog Filtering l 18-Bit Resolution l 94 dB Dynamic Range l 0.003% THD l Low Clock Jitter Sensitivity l Single +3 V or +5 V Power Supply l Filtered Line Level Outputs Linear Phase Filtering l On-Chip Digital De-emphasis DEM/SCLK 2 LRCK SDATA 3 1 Serial Input Interface De-emphasis AGND 6 VA+ 7 Voltage Reference Interpolator Delta-Sigma Modulator DAC Analog Low-Pass Filter AOUTL 8 Interpolator Delta-Sigma Modulator 4 MCLK DAC Analog Low-Pass Filter AOUTR 5 Cirrus Logic, Inc. Crystal Semiconductor Products Division P.O. Box 17847, Austin, Texas 78760 (512) 445 7222 FAX: (512) 445 7581 http://www.crystal.com Copyright © Cirrus Logic, Inc. 1997 (All Rights Reserved) MAY ‘97 DS136F1 1 CS4330, CS4331, CS4333 ANALOG CHARACTERISTICS (TA = 25°C; Logic "1" = VA+; Logic "0" = AGND; MCLK = 12.288 MHz; Full-Scale Output Sine Wave, 991 Hz; Input Sample Rate = 48 kHz; Input Data = 18 Bits; SCLK = 3.072 MHz; Measurement Bandwidth is 10 Hz to 20 kHz, unweighted; unless otherwise specified. Resistive load = 20 kΩ, capacitive load = 100 pF) CS4330/31/33-KS VA +5V Parameter Specified Temperature Range Resolution Symbol Min TA -10 (A-weighted) THD+N 0 26.23 60 tgd 16 / Fs 90 0.1 250 ± 10 -86 -72 -32 ± 0.5 to ± 0.1 -81 -68 -28 21.77 ±0.05 0 26.23 60 16 / Fs 90 0.1 250 ± 10 -85 -67 -27 ± 0.5 to ± 0.1 -80 21.77 ±0.05 -88 0 26.23 60 -86 -72 -32 ± 0.5 to ± 0.1 16 / Fs 90 0.1 250 -79 -66 -26 21.77 ±0.05 ± 10 dB dB dB deg kHz dB dB kHz dB s dB dB % ppm/°C Vpp VDC kΩ pF mA µA mW mW dB 90 Typ to 94 Max 70 18 CS4330/31/33-KS VA +3V Min -10 Typ to 89 0.003 Max 70 18 CS4330/31/33-BS VA +5V only Min -40 88 Typ to 94 .003 Max +85 18 .008 Units °C Bits dB % Dynamic Performance Dynamic Range Total Harmonic Distortion Total Harmonic Distortion + Noise 0 dB Output, -20 dB Output, -60 dB Output Deviation From Linear Phase Passband: to 0.05 dB corner (Note 1) (Note 2,3) 0.003 0.007 Frequency Response 10 Hz to 20 kHz(Note 1) Passband Ripple StopBand StopBand Attenuation Interchannel Isolation (1 kHz) (Note 3) (Notes 2,3) (Note 4) Group Delay (Fs = Input Sample Rate) dc Accuracy Interchannel Gain Mismatch Gain Error Gain Drift Analog Output Full Scale Output Voltage Output Common Mode Voltage Minimum Resistive Load Maximum Capacitive Load 3.33 IA+ IA+ PSRR 3.70 2.3 10 100 28 60 140 0.3 50 4.07 32 160 1.66 1.85 1.3 10 100 20 20 60 0.06 50 2.03 25 75 3.33 3.70 2.3 20 100 28 60 140 0.3 50 4.07 32 160 - Power Supplies Power Supply Current: Power Dissipation normal operation power-down normal operation power-down (1 kHz) Power Supply Rejection Ratio Notes: 1. Combined digital and analog filter characteristics. 2. The passband and stopband edges scale with frequency. For input sample rates, Fs, other than 48 kHz, the 0.05 dB passband edge is 0.4535×Fs and the stopband edge is 0.5465×Fs. 3. Digital filter characteristics. 4. Measurement Bandwidth is 10 Hz to Fs (kHz) 2 DS136F1 CS4330, CS4331, CS4333 SWITCHING CHARACTERISTICS (TA = 25 °C; VA+ = 2.7V - 5.5V; Inputs: Logic 0 = 0V, Logic 1 = VA+, CL = 20 pF) Switching characteristics are guaranteed by characterization. Parameter Input Sample Rate LRCK Duty Cycle (External SCLK only) MCLK Pulse Width High MCLK Pulse Width Low MCLK Pulse Width High MCLK Pulse Width Low MCLK Pulse Width High MCLK Pulse Width Low External SCLK Mode SCLK Pulse Width Low SCLK Pulse Width High SCLK Period SCLK rising to LRCK edge delay SCLK rising to LRCK edge setup time SDATA valid to SCLK rising setup time SCLK rising to SDATA hold time Internal SCLK Mode SCLK Period SCLK rising to LRCK edge SDATA valid to SCLK rising setup time SCLK rising to SDATA hold time SCLK rising to SDATA hold time MCLK / LRCK = 256 or 512 MCLK / LRCK = 384 (Note 6) tsclkw tsclkr tsdlrs tsdh tsdh 1 SCLK Symbol Fs (Note 5) MCLK / LRCK = 512 MCLK / LRCK = 512 MCLK / LRCK = 384 MCLK / LRCK = 384 MCLK / LRCK = 256 MCLK / LRCK = 256 Min 2 30 10 15 21 21 35 39 Typ 50 - Max 50 70 1000 1000 1000 1000 1000 1000 Units kHz % ns ns ns ns ns ns tsclkl tsclkh tsclkw tslrd tslrs tsdlrs tsdh 20 20 1 (128)Fs - - ns ns ns ns ns ns ns 20 20 20 20 tsclkw 2 - ns µs ns ns ns 1 + 15 (512)Fs 1 +15 (512)Fs 1 +15 (384)Fs - Notes: 5. In Internal SCLK Mode, the Duty Cycle must be 50% ±1/2 MCLK Period. 6. The SCLK / LRCK ratio may be either 32, 48, or 64. DS136F1 3 CS4330, CS4331, CS4333 LRCK t slrd t slrs t sclkl t sclkh SCLK t sdlrs SDATA t sdh External Serial Mode Input Timing *LRCK t sclkr SDATA t sclkw t sdlrs **INTERNAL SCLK t sdh Internal Serial Mode Input Timing * LRCK for CS4331 ** The SCLK pulses shown are internal to the CS4330/31/33. LRCK MCLK 1 *INTERNAL SCLK N 2 N SDATA Internal Serial Clock Generation * The SCLK pulses shown are internal to the CS4330/31/33. N equals MCLK divided by SCLK 4 DS136F1 CS4330, CS4331, CS4333 DIGITAL CHARACTERISTICS Parameter High-Level Input Voltage (TA = 25 °C; VA+ = 2.7V - 5.5V) Symbol (VA+ = 5.5V) (VA+ = 5.0V) VIH VIH VIL (Note 7) Iin Min 2.4 2.0 Typ Max 0.8 ±10 Units V V V µA Low-Level Input Voltage Input Leakage Current Notes: 7. Iin for CS4331 LRCK is ± 20 µA max. ABSOLUTE MAXIMUM RATINGS Parameter DC Power Supply: Input Current, Any Pin Except Supplies Digital Input Voltage Ambient Operating Temperature (power applied) Storage Temperature (AGND = 0V; all voltages with respect to ground.) Symbol VA+ Iin VIND TA Tstg Min -0.3 -0.3 -55 -65 Max 6.0 Units V mA V °C °C ±10 (VA+)+0.4 125 150 WARNING: Operation at or beyond these limits may result in permanent damage to the device. Normal operation is not guaranteed at these extremes. RECOMMENDED OPERATING CONDITIONS (AGND = 0V; all voltages with respect to ground) Parameter DC Power Supply: (3V mode) (5V mode) Symbol VA+ VA+ Min 2.7 4.75 Typ 3.0 5.0 Max 4.0 5.5 Units V V DS136F1 5 CS4330, CS4331, CS4333 7 VA+ 1 Audio Data Processor 2 3 SDATA DEM/SCLK LRCK CS4330 CS4331 CS4333 External Clock 4 0.1 µF + +3V/+5V 10 µF 8 AOUTL 10 µF + * * 2.4kΩ 56kΩ ** C Left Audio Output AOUTR MCLK AGND 6 5 10 µF + * * 2.4kΩ 56kΩ ** C Right Audio Output * Required for AC coupling only 1 ** C = (2π)(2400Ω)(Fs)(2) Figure 1. Recommended Connection Diagram 6 DS136F1 CS4330, CS4331, CS4333 GENERAL DESCRIPTION The CS4330, CS4331, and CS4333 are complete stereo digital-to-analog systems including digital interpolation, 128× third-order delta-sigma digital-to-analog conversion, digital de-emphasis and analog filtering, Figure 2. This architecture provides a high tolerance to clock jitter. The primary purpose of using delta-sigma modulation techniques is to avoid the limitations of laser trimmed resistive digital-to-analog converter architectures by using an inherently linear 1-bit digital-to-analog converter. The advantages of a 1-bit digital-to-analog converter include: ideal differential linearity, no distortion mechanisms due to resistor matching errors and no linearity drift over time and temperature due to variations in resistor values. Digital Interpolation Filter The digital interpolation filter increases the sample rate by a factor of 32 and is followed by a 4× digital sample-and-hold to effectively achieve a 128× interpolation filter. This filter eliminates images of the baseband audio signal which exist at multiples of the input sample rate, Fs. This allows for the selection of a less complex analog filter based on out-of-band noise attenuation requirements rather than anti-image filtering. Following the interpolation filter, the resulting frequency spectrum has images of the input signal at multiples of 128× the input sample rate. These images are removed by the external analog filter. Delta-Sigma Modulator The interpolation filter is followed by a thirdorder delta-sigma modulator which converts the 22-bit interpolation filter output into 1-bit data at 128× . Switched-Capacitor Filter The delta-sigma modulator is followed by a digital-to-analog converter which translates the 1-bit data into a series of charge packets. The magnitude of the charge in each packet is determined by sampling of a voltage reference onto a switched capacitor, where the polarity of each packet is controlled by the 1-bit signal. This technique greatly reduces the sensitivity to clock jitter and is a major improvement over earlier generations of 1-bit digital-to-analog converters. Digital Input Interpolator Delta-Sigma Modulator DAC Analog Low-Pass Filter Analog Output Figure 2. System Block Diagram DS136F1 7 CS4330, CS4331, CS4333 SYSTEM DESIGN The CS4330/31/33 accept data at standard audio frequencies including 48 kHz, 44.1 kHz and 32 kHz. Audio data is input via the serial data input pin (SDATA). The Left/Right Clock (LRCK) defines the channel and delineation of data and the Serial Clock (SCLK) clocks audio data into the input data buffer. The CS4330, CS4331 and CS4333 differ in the serial data format as shown in Figures 4-7. The Master Clock (MCLK) is used to operate the digital interpolation filter and the delta-sigma modulator. Master Clock The MCLK must be either 256×, 384×, or 512× the desired input sample rate, Fs. Fs is the frequency at which words for each channel are input to the digital-to-analog converter, and is equal to the LRCK frequency. The MCLK to LRCK frequency ratio is detected automatically during the initialization sequence by counting the number of MCLK transitions during a single LRCK period. Internal dividers are set to generate the proper clocks for the digital filter, delta-sigma modulator and switched-capacitor filter. Table 1 illustrates several standard audio sample rates and the required MCLK and LRCK frequencies. LRCK (kHz) 32 44.1 48 MCLK (MHz) 384x 512x 12.2880 16.3840 16.9344 22.5792 18.4320 24.5760 External Serial Clock Mode The CS4330/31/33 will enter the External Serial Clock Mode when 4 low to high transitions are detected on the DEM/SCLK pin during any phase of the LRCK period. When this mode is enabled, the Internal Serial Clock Mode and deemphasis filter cannot be accessed. The CS4330/31/33 must return to Power-Down to exit this mode. Refer to Figure 8. Internal Serial Clock Mode In the Internal Serial Clock Mode, the serial clock is internally derived and synchronous with MCLK and LRCK. The SCLK/LRCK frequency ratio is either 32, 48, or 64. Operation in this mode is identical to operation with an external serial clock synchronized with LRCK. This mode allows access to the digital de-emphasis function. Refer to Figure 8. While the Internal Serial Clock Mode is provided to allow access to the de-emphasis filter, the Internal Serial Clock Mode also eliminates possible clock interference from an external SCLK. Use of Internal Serial Clock Mode is always preferred, even when de-emphasis filtering is not required. De-Emphasis 256x 8.1920 11.2896 12.2880 Table 1. Common Clock Frequencies The CS4330/31/33 include on-chip digital deemphasis. Figure 3 shows the de-emphasis curve for Fs equal to 44.1 kHz. The frequency response of the de-emphasis curve will scale proportionally with changes in sample rate, Fs. The de-emphasis filter is active (inactive) if the DEM/SCLK pin is low (high) for 8 consecutive falling edges of LRCK. This function is available only in the internal serial clock mode. Serial Clock The serial clock controls the shifting of data into the input data buffers. The CS4330/31/33 support both external and internal serial clock generation modes. Refer to Figures 4-7 for data formats. 8 DS136F1 CS4330, CS4331, CS4333 Gain dB T1=50ms 0dB T2 = 15ms -10dB CS4330/31/33 adapt to these new operating conditions. It is recomended that the CS4330/31/33 not be powered up with the clocks (MCLK, LRCK, SCLK) going. Power Supply Determination The nominal power supply voltage for the CS4330/31/33 may be either +5 or +3 Volts. "SMART Analog" circuitry senses the power supply voltage during the initialization sequence or when exiting the Power-Down mode. +5V operation will be set with a 3.7 Vpp full scale output if VA+ is between 4.75 and 5.5 Volts. The CS4330/31/33 will be set for +3V operation with a 1.85 Vpp full scale output if VA+ is between 2.7 and 4.0 Volts. Supply voltages between 4.0 and 4.75 Volts should be avoided to prevent operation in the 5V mode. In this condition there is insufficient headroom to produce a 3.7 Vpp output. Grounding and Power Supply Decoupling As with any high resolution converter, the CS4330/31/33 require careful attention to power supply and grounding arrangements to optimize performance. Figure 1 shows the recommended power arrangements with VA+ connected to a clean +3/+5V supply. Decoupling capacitors should be located as near to the CS4330/31/33 as possible. Analog Output and Filtering The CS4330/31/33 analog filter is a switched-capacitor filter. The switched-capacitor filter frequency response is clock dependent and will scale with sample rate. The digital filter of the CS4330/31/33 is designed to compensate for the magnitude and phase response of a single-pole low-pass filter at twice the sample rate. Output filters consisting of a 2.4 kohm resistor and capacitor are recom9 F1 3.183 kHz F2 Frequency 10.61 kHz Figure 3. De-Emphasis Curve (Fs = 44.1kHz) Initialization and Power-Down The Initialization and Power-Down sequence flow chart is shown in Figure 8. The CS4330/31/33 enter the Power-Down mode upon initial powerup. The interpolation filters and delta-sigma modulators are reset, and the internal voltage reference, one-bit digital-to-analog converters and switched-capacitor low-pass filters are powered down. The device will remain in the PowerDown mode until MCLK and LRCK are presented. Once MCLK and LRCK are detected, MCLK occurrences are counted over one LRCK period to determine the MCLK/LRCK frequency ratio. Power is then applied to the internal voltage reference and the +5 or +3 Volt power supply mode is determined. Finally, power is applied to the D/A converters and switched-capacitor filters, and the analog outputs will move to approximately 2.3V (1.3V in 3V mode). This process requires approximately 1ms plus 1024 cycles of LRCK. The CS4330/31/33 enter the Power-Down mode within 1 period of LRCK if either MCLK or LRCK is removed. The initialization sequence begins when MCLK and LRCK are restored. If the MCLK/LRCK frequency ratio or the VA+ voltage changes during Power-Down, the DS136F1 CS4330, CS4331, CS4333 LRCK Left Channel Right Channel SCLK SDATA 10 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Internal SCLK Mode Right Justified, 18-Bit Data Data Valid on Rising Edge of SCLK INT SCLK = 64 Fs if MCLK/LRCK = 256 or 512 INT SCLK = 48 Fs if MCLK/LRCK = 384 External SCLK Mode Right Justified, 18-Bit Data Data Valid on Rising Edge of SCLK SCLK must have at least 36 cycles per LRCK Figure 4. CS4330 Data Format LRCK SCLK Left Channel Right Channel SDATA 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Internal SCLK Mode I2S, 16-Bit Data Data Valid on Rising Edge of SCLK INT SCLK = 32 Fs if MCLK/LRCK = 512 or 256 INT SCLK = 48 Fs if MCLK/LRCK = 384 Figure 5. CS4331 Internal SCLK Data Format (I2S) 10 DS136F1 CS4330, CS4331, CS4333 LRCK SCLK Left Channel Right Channel SDATA 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 External SCLK Mode I2S, 18-Bit Data Data Valid on Rising Edge of SCLK SCLK must have at least 36 cycles per LRCK Figure 6. CS4331 External SCLK Data Format (I2S) LRCK Left Channel Right Channel SCLK SDATA 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Internal SCLK Mode Right Justified, 16-Bit Data Data Valid on Rising Edge of SCLK INT SCLK = 32 Fs if MCLK/LRCK = 512 or 256 INT SCLK = 48 Fs if MCLK/LRCK = 384 External SCLK Mode Right Justified, 16-Bit Data Data Valid on Rising Edge of SCLK SCLK must have at least 32 cycles per LRCK Figure 7. CS4333 SCLK Data Format DS136F1 11 CS4330, CS4331, CS4333 USER: Apply Power Power-Down Mode USER: Apply MCLK and LRCK 256/384/512 MCLK/LRCK Determination Power Supply Determination +3 or +5 Volt mode USER: set SCLK mode USER: Remove Clocks SCLK mode internal external USER: Remove Clocks Normal Operation De-emphasis available USER: Apply SDATA Normal Operation De-emphasis not available USER: Apply SDATA Analog Output is Generated Analog Output is Generated Figure 8. CS4330/31/33 Initialization and Power-Down Sequence 12 DS136F1 CS4330, CS4331, CS4333 mended on the analog outputs. The required capacitor value is defined by: 1 C= (2π) (Fs) (2400 Ω) (2) Example: Fs = 48 kHz C = 690 pF Combined Digital and Analog Filter Response The frequency response of the combined analog switched-capacitor filter, digital filter, and offchip single pole RC-filter at 2 Fs, is shown in Figures 9, 10, 11, and 12. The overall response is clock dependent and will scale with Fs. Note that the response plots have been normalized to Fs and can be de-normalized by multiplying the X-axis scale by Fs. A value of 680 pF may be used with only 1.45% error which is negligible. Figure 9. CS4330/31/33 Combined Digital and Analog Filter Stopband Rejection Figure 11. CS4330/31/33 Combined Digital and Analog Filter Transition Band Figure 10. CS4330/31/33 Combined Digital and Analog Filter Transition Band DS136F1 Figure 12. CS4330/31/33 Combined Digital and Analog Filter Passband Ripple 13 CS4330, CS4331, CS4333 Performance Plots The following CS4330/31/33 measurement plots were taken on the CDB4330/31/33 evaluation board with an Audio Precision Dual Domain System One. All plots are done in +5V mode at a 48 kHz sampling rate, and are shown in Figures 13-20. Figure 13 shows the CS4330/31/33 frequency response. The response is flat to 20 kHz ± 0.1dB as specified. Figure 14 shows THD+N versus signal amplitude for a 1 kHz 20-bit dithered input signal. Figure 15 shows a 16k FFT of a 1 kHz full-scale input signal. The signal has been filtered by a notch filter within the System One to remove the fundamental component of the signal. This minimizes the distortion created in the analyzer analog-to-digital converter. This technique is discussed by Audio Precision in the 10th anniversary edition of AUDIO.TST. Figure 16 shows a 16k FFT of a 1 kHz -3 dBFs input signal. The signal has been filtered by a notch filter within the System One to remove the fundamental component of the signal. Figure 17 shows a 16k FFT of a 1 kHz -20 dBFs input signal. The signal has been filtered by a notch filter within the System One to remove the fundamental component of the signal. Figure 18 shows a 16k FFT of a 1 kHz -60 dBFs input signal. Figure 19 shows a 16k FFT of a 1 kHz -90 dBFs input signal. Figure 20 shows the fade-to-noise linearity. The input signal is a dithered 18-bit 500 Hz sine Figure 14. THD+N vs. Amplitude Figure 13. Frequency Response Figure 15. 0 dBFs FFT 14 DS136F1 CS4330, CS4331, CS4333 wave which fades from -60 to -120 dBFs. During the fade, the output from the CS4330/31/33 is measured and compared to the ideal level. Notice the very close tracking of the output level to the ideal, even at low level inputs. This indicates very good low-level linearity, one of the key benefits of delta-sigma digital-to-analog conversion. Figure 18. -60 dBFs FFT Figure 16. -3 dBFs FFT Figure 19. -90 dBFs FFT Figure 17. -20 dBFs FFT DS136F1 Figure 20. Fade-to-Noise Linearity 15 CS4330, CS4331, CS4333 Configuration Register The CS4330, CS4331, CS4333 support multiple 2’s-complement data/clock formats. The required format is governed by the contents of the Configuration Register. The 5-bit register determines which serial data format is acceptable, the frequency of the Internal Serial Clock, on which edge of SCLK audio data must be valid, and the number of bits to be loaded into the input buffer. On initial power-up, the register is loaded with the default settings, and it is not necessary to write to the register if this format is appropriate. The default settings are shown in Figures 4-7. The 8-bit code includes a 3-bit preamble to prevent accidental access to the Configuration Register. Each bit of the code is read on the falling edge of LRCK as shown in the Figures 21 and 22. The code 01000000 is considered to be an error condition and is ignored. The configuration routine requires that the SDATA pin is held high, as shown in Figures 21 and 22, to prevent accidental writing to the register. The Configuration Register is only accessible prior to entering the External Serial Clock Mode. For I2S mode, the user must set B6 to 0, and B7 to 1. B1 B2 B3 B4 B5 B6 B7 B8 B1 B2 B3 0 1 0 All other Codes Configuration Access Code Access Allowed Access Denied B4 B5 Internal SCLK Mode only Sets Internal SCLK/LRCK Ratio * 0 0 SCLK/LRCK = 32 0 1 Reserved 1 0 SCLK/LRCK = 64 1 1 SCLK/LRCK = 128 * The Internal SCLK will be 48 Fs, if the MCLK/LRCK ratio is 384×. B4 B5 External SCLK Mode only Selects Data Sampling edge of SCLK 1 0 Rising edge of SCLK 1 1 Falling edge of SCLK B6 0 1 B7 0 1 B8 0 1 Left or Right Justified Data in relation to LRCK transition Left Justified Right Justified I2S Data Format Disabled Enabled Sets the number of Bits 18 Bits 16 Bits Schematic & Layout Review Service Confirm Optimum Schematic & Layout Before Building Your Board. For Our Free Review Service Call Applications Engineering. Call: (512) 445-7222 16 DS136F1 CS4330, CS4331, CS4333 Figure 21. Configuration Operation Figure 22. Configuration Timing Parameter DEM/SCLK TIMING DEM/SCLK valid to LRCK falling setup time LRCK falling to DEM/SCLK hold time SDATA setup time SDATA hold time Symbol tclrs tclrh tsetup thold Min 20 20 1 1 Typ - Max - Units ns ns us us Table 2. Configuration Timing Characteristics DS136F1 17 CS4330, CS4331, CS4333 REFERENCES 1)"An 18-Bit, 8-Pin Stereo Digital-to-Analog Converter" by J.J. Paulos, A.W. Krone, G.D Kamath, and S.T. Dupuie. Paper presented at the 97th Convention of the Audio Engineering Society, November 1994. 2)"How to Achieve Optimum Performance from Delta-Sigma A/D & D/A Converters" by Steven Harris. Paper presented at the 93rd Convention of the Audio Engineering Society, October 1992. 3)"Multiplier-Free Interpolation for Oversampled Digital-to-Analog Conversion" by Jeffrey W. Scott. Paper presented at the 92nd Convention of the Audio Engineering Society, March 1992. 4)"An 18-Bit Stereo D/A Converter With Integrated Digital and Analog Filters" by Nav S. Sooch, Jeffrey W. Scott. Paper presented at the 91st Convention of the Audio Engineering Society, November 1991. 5)CDB4330/31/33 Evaluation board Data Sheet; DS136DB2 MAR’96 18 DS136F1 CS4330, CS4331, CS4333 PIN DESCRIPTIONS SERIAL DATA INPUT DE-EMPHASIS / SCLK LEFT / RIGHT CLOCK MASTER CLOCK SDATA DEM/SCLK LRCK MCLK 1 2 3 4 8 7 6 5 AOUTL VA+ AGND AOUTR ANALOG ANALOG ANALOG ANALOG LEFT CHANNEL OUTPUT POWER GROUND RIGHT CHANNEL OUTPUT Power Supply Connections VA+ - Positive Analog Power, PIN 7. Positive analog supply. Nominally +5V or +3V. AGND - Analog Ground, PIN 6. Analog ground reference. Analog Outputs AOUTL - Analog Left Channel Output, PIN 8. Analog output for the left channel. Typically 3.7 Vpp for a full-scale input signal at VA+ = 5V and 1.85 Vpp at VA+ = 3V. AOUTR - Analog Right Channel Output, PIN 5. Analog output for the right channel. Typically 3.7 Vpp for a full-scale input signal at VA+ = 5V and 1.85 Vpp at VA+ = 3V. Digital Inputs MCLK - Master Clock Input, PIN 4. The frequency must be 256×, 384× , or 512× the input sample rate (Fs). LRCK - Left/Right Clock, PIN 3. This input determines which channel is currently being input on the Audio Serial Data Input pin, SDATA. SDATA - Audio Serial Data Input, PIN 1. Two’s complement MSB-first serial data is input on this pin. The data is clocked into the CS4330, CS4331, and CS4333 via internal or external SCLK and the channel is determined by LRCK. DEM/SCLK - De-emphasis / External serial clock input , PIN 2. A dual-purpose input used for de-emphasis filter control or external serial clock input. DS136F1 19 CS4330, CS4331, CS4333 PARAMETER DEFINITIONS Total Harmonic Distortion + Noise (THD+N)- 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. Dynamic Range - The ratio of the full scale 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 measurement over the specified bandwidth made with a -60 dBFs signal. 60 dB is then added to the resulting measurement to refer the measurement to full scale. This technique ensures that the distortion components are below the noise level and do not effect 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. Interchannel Isolation - A measure of crosstalk between the left and right channels. Measured for each channel at the converter’s output with all zeros 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 output for a full scale digital input. Gain Drift - The change in gain value with temperature. Units in ppm/°C. 20 DS136F1 CS4330, CS4331, CS4333 ORDERING INFORMATION: Model CS4330-KS CS4331-KS CS4333-KS CS4330-BS CS4331-BS CS4333-BS PACKAGE DIMENSIONS A Temperature -10 to +70°C -10 to +70°C -10 to +70°C -40 to +85°C -40 to +85°C -40 to +85°C Package 8-pin Plastic SOIC 8-pin Plastic SOIC 8-pin Plastic SOIC 8-pin Plastic SOIC 8-pin Plastic SOIC 8-pin Plastic SOIC MILLIMETERS DIM 8-Pin SOIC A B C B E D INCHES MAX 5.35 TYP 0.25 1.88 0.51 MIN 5.15 1.27 0 1.77 0.33 MIN 0.203 0.050 0 0.070 MAX 0.210 TYP 0.010 0.074 0.020 E F G D F H I J 0.013 0.006 0 0.204 0.019 0.302 0.15 0 5.18 0.48 7.67 0.25 8 5.4 0.76 8.1 0.010 8 0.213 G H I J C 0.030 0.319 Note: The EIAJ package is not a standard JEDEC package size DS136F1 21 • Notes • CDB4330 CDB4331 CDB4333 Evaluation Board for CS4330 / CS4331 / CS4333 Features General Description The CDB4330/31/33 evaluation board is an excellent means for quickly evaluating the CS4330/31/33 18-bit, stereo D/A converter. Evaluation requires an analog signal analyzer, a digital signal source and a power supply. Analog outputs are provided via RCA connectors for both channels. The CS8412 digital audio receiver I.C. provides the system timing necessary to operate the CS4330/31/33 and will accept AES/EBU, S/PDIF, and EIAJ-340 compatible audio data. The evaluation board may also be configured to accept external timing signals for operation in a user application during system development. ORDERING INFORMATION: CDB4330, CDB4331, CDB4333 • Demonstrates recommended layout and grounding arrangements • CS8412 Receives AES/EBU, S/PDIF, & EIAJ-340 Compatible Digital Audio • Digital and Analog Patch Areas • Requires only a digital signal source and power supplies for a complete Digital-to-Analog-Converter system I/O for Clocks and Data Digital Audio Input CS8412 Digital Audio Interface CS4330/31/33 Analog Filter Crystal Semiconductor Corporation P.O. Box 17847, Austin, TX 78760 (512) 445-7222 Fax: (512) 445 7581 Copyright © Crystal Semiconductor Corporation 1996 (All Rights Reserved) MAR ’96 DS136DB2 23 CDB4330, CDB4331, CDB4333 CDB4330/31/33 System Overview The CDB4330/31/33 evaluation board is an excellent means of quickly evaluating the CS4330/31/33. The CS8412 digital audio interface receiver provides an easy interface to digital audio signal sources including the majority of digital audio test equipment. The evaluation board also allows the user to supply clocks and data through a 10-pin header for system development. The CDB4330/31/33 schematic has been partitioned into 5 schematics shown in Figures 2 through 7. Each partitioned schematic is represented in the system diagram shown in Figure 1. Notice that the the system diagram also includes the interconnections between the partitioned schematics. CS4330/31/33 Digital to Analog Converter A description of the CS4330/31/33 is included in the CS4330/31/33 data sheet. CS8412 Digital Audio Receiver The system receives and decodes the standard S/PDIF data format using a CS8412 Digital Audio Receiver, Figure 4. The outputs of the CS8412 include a serial bit clock, serial data, left-right clock (FSYNC), de-emphasis control and a 256Fs master clock. The operation of the CS8412 and a discussion of the digital audio interface are included in the 1994 Crystal Semiconductor Audio Data Book. During normal operation, the CS8412 operates in the Channel Status mode where the LED’s display channel status information for the channel selected by the CSLR/FCK jumper. This allows the CS8412 to decode and supply the de-emphasis bit from the digital audio interface for control of the CS4330/31/33 de-emphasis filter via pin 3, CC/F0, of the CS8412. 24 When the Error Information Switch is activated, the CS8412 operates in the Error and Frequency information mode. The information displayed by the LED’s can be decoded by consulting the CS8412 data sheet. If the Error Information Switch is activated, and the CS4330/31/33 is in the internal serial clock mode, then it is likely that the de-emphasis control for the CS4330/31/33 will be erroneous and produce an incorrect audio output. Encoded sample frequency information can be displayed provided a proper clock is being applied to the FCK pin of the CS8412. When an LED is lit, this indicates a "1" on the corresponding pin located on the CS8412. When an LED is off, this indicates a "0" on the corresponding pin. Neither the L or R option of CSLR/FCK should be selected if the FCK pin is being driven by a clock signal. The evaluation board has been designed such that the input can be either optical or coax, Figure 6. It is not necessary to select the active input. However, both inputs can not be driven simultaneously. CS8412 Data Format The CS8412 data format can be set with jumpers M0, M1, M2, and M3. These formats are shown in the CS8412 datasheet found in the 1994 Crystal Semiconductor Audio Data Book. The format selected must be compatible with the corresponding data format of the CS4330/31/33 shown in Figures 4-7 of the CS4330/31/33 datasheet. The default settings for M0-M3 on the evaluation board are given in Tables 2-4. The compatible data formats we have chosen for the CS8412 and CS4330/31/33 are: CS8412 format 6;CS4330 CS8412 format 2;CS4331 (External SCLK only) CS8412 format 5;CS4333 (External SCLK only) DS136DB2 CDB4330, CDB4331, CDB4333 Analog output filter The recommended single pole filter required for the CS4330/31/33 has been combined with a unity gain output buffer (see Figure 2). The analog output filter uses a Motorola MC33202 single supply, dual op-amp. The low pass filter corner frequency is located at 2 Fs, or 88.2 kHz and is calculated by: 1 F= (2π) (R8 || R9) (C29) The transceiver operates as a transmitter with the CLK SOURCE jumper in the 8412 position. LRCK, SDATA, and SCLK from the CS8412 will be available on J1. J22 must be in the 0 position and J23 must be in the 1 position for MCLK to be an output and to avoid bus contention on MCLK. The transceiver operates as a receiver with the CLK SOURCE jumper in the EXTERNAL position. LRCK, SDATA and SCLK on J1 become inputs. The CS8412 must be removed from the evaluation board for operation in this mode. There are 2 options for the source of MCLK in the External Clock Source mode. MCLK can be an input with J23 in the 1 position and J22 in the 0 position. However, the recommended mode of operation is to generate MCLK on the evaluation board. MCLK becomes an output with LRCK, SCLK and SDATA inputs. This technique insures that the CS4330/31/33 receives a jitter free clock to maximize performance. This can be accomplished by installing a crystal oscillator into U5, see Figure 4 (the socket for U5 is located within the footprint for the CS8412) and placing J22 in the 1 position and J23 in the 0 position. Grounding and Power Supply Decoupling The CS4330/31/33 requires careful attention to power supply and grounding arrangements to optimize performance. Figure 2 shows the recommended power arrangements. The CS4330/31/33 is positioned over the analog ground plane near the digital/analog ground plane split. These ground planes are connected elsewhere on the board. This layout technique is used to minimizing digital noise and to insure proper power supply matching/sequencing. The decoupling capacitors are located as close to the CS4330/31/33 as possible. Extensive use of ground plane fill on both the analog and digital sections of the evaluation board yield large reductions in radiated noise effects. 25 F= 1 (2π) (15kΩ || 6.65kΩ) (390pF) = 88.5 kHz Power Supply Circuitry Power is supplied to the evaluation board by three binding posts (GND, +5V, +3V/+5V), See Figure 7. The +5V input supplies power to the +5 Volt digital circuitry (VD+5), while the +3V/+5V input supplies power to the Voltage Level Converter (VD+3/+5), and CS4330/31/33 (VA+3/+5) for evaluation in either +3 or +5 Volt mode. The op-amp is supplied from the analog supply (VA+) which can be derived from either the +5V post (VA+5) or the +3/+5V post (VA+3/+5) depending upon which Ferrite bead (L4 or L5) is installed. The evaluation board is configured with VA+ derived from VA+5 (L5 installed). To derive VA+ from the +3V/+5V post (VA+3/+5), remove the Ferrite bead at L5, and install it at L4. Input/Output for Clocks and Data The evaluation board has been designed to allow the interface to external systems via the 10-pin header, J1. This header allows the evaluation board to accept externally generated clocks and data. The schematic for the clock/data I/O is shown in Figure 5. The 74HC243 transceiver functions as an I/O buffer where the CLK SOURCE jumper determines if the transceiver operates as a transmitter or receiver. DS136DB2 CDB4330, CDB4331, CDB4333 CONNECTOR +5V +3/+5V GND Digital Input Optical Input MCLK, SCLK, LRCK SDATA AOUTL AOUTR INPUT/OUTPUT input input input input input input input input/output input/output output output SIGNAL PRESENT (VD+5V) for CS8412 and digital section (VA+) for Analog output filter op-amp (configured for +5V) (VD+3/+5V) for Voltage Level Converter (VA+3/+5V) for CS4330/31/33 ground connection from power supply digital audio interface input via coax digital audio interface input via optical I/O for master, serial, and left/right clocks I/O for serial data left channel analog output right channel analog output Table 1. System Connections JUMPER CSLR/FCK Clock Select J22 J23 M0 M1 M2 M3 SCLK DEM_8412 PURPOSE selects channel for CS8412 channel status information Selects source of system clocks and data Selects MCLK as Input or Output CS8412 mode select POSITION L R *8412 EXT *0 *1 *Low *High *High *Low INT *EXT *Low High FUNCTION SELECTED See CS8412 data sheet for details CS8412 clock/data source External clock/data source See Input/Output for Clocks and Data section of text See CS8412 data sheet for details Internal SCLK Mode External SCLK Mode CS8412 de-emphasis De-emphasis input static high Selects SCLK Mode Selects source of deemphasis control * Default setting from factory Table 2. CDB4330 Jumper Selectable Options 26 DS136DB2 CDB4330, CDB4331, CDB4333 JUMPER CSLR/FCK Clock Select J22 J23 M0 M1 M2 M3 SCLK DEM_8412 PURPOSE selects channel for CS8412 channel status information Selects source of system clocks and data Selects MCLK as Input or Output CS8412 mode select POSITION L R *8412 EXT *0 *1 *Low *High *Low *Low INT *EXT *Low High FUNCTION SELECTED See CS8412 data sheet for details CS8412 clock/data source External clock/data source See Input/Output for Clocks and Data section of text See CS8412 data sheet for details Internal SCLK Mode (Note 1) External SCLK Mode (Note 1) CS8412 de-emphasis De-emphasis input static high Selects SCLK Mode Selects source of deemphasis control * Default setting from factory Note 1. The CS8412 output data format requires the CS4331 be in the External SCLK Mode Table 3. CDB4331 Jumper Selectable Options JUMPER CSLR/FCK Clock Select J22 J23 M0 M1 M2 M3 SCLK DEM_8412 PURPOSE selects channel for CS8412 channel status information Selects source of system clocks and data Selects MCLK as Input or Output CS8412 mode select POSITION L R *8412 EXT *0 *1 *High *Low *High *Low INT *EXT *Low High FUNCTION SELECTED See CS8412 data sheet for details CS8412 clock/data source External clock/data source See Input/Output for Clocks and Data section of text See CS8412 data sheet for details Internal SCLK Mode (Note 1) External SCLK Mode (Note 1) CS8412 de-emphasis De-emphasis input static high Selects SCLK Mode Selects source of deemphasis control * Default setting from factory Note 1. The CS8412 output data format requires the CS4333 be in the External SCLK Mode Table 4. CDB4333 Jumper Selectable Options DS136DB2 27 CDB4330, CDB4331, CDB4333 Digital Audio Input Fig 6 I/O for Clocks and Data Fig 5 RXN RXP CS8412 Digital Audio Interface MCLK LRCK SCLK SDATA Power Down Fig 3 MCLK Voltage LRCK Level SCLK Converter SDATA AOUTL CS4330/31/33 AOUTR Fig 2 Fig 2 Analog Filter Fig 3 Fig 4 Figure 1. System Block Diagram and Signal Flow 28 DS136DB2 DS136DB2 CDB4330, CDB4331, CDB4333 Figure 2. CS4330/31/33 and Connections 29 CDB4330, CDB4331, CDB4333 Figure 3. Voltage Level Conversion and Power Down Circuitry 30 DS136DB2 DS136DB2 CDB4330, CDB4331, CDB4333 NOTE: U2 and U5 cannot be installed simultaneously Figure 4. CS8412 Digital Audio Receiver Connections 31 CDB4330, CDB4331, CDB4333 Figure 5. I/O Interface for Clocks and Data Figure 6. Digital Audio Input Optical Toshiba part TORX173 available through Insight Electronics 32 DS136DB2 CDB4330, CDB4331, CDB4333 Figure 7. Power Supply DS136DB2 33 CDB4330, CDB4331, CDB4333 Figure 8. CDB4330/31/33 Component Side Silkscreen 34 DS136DB2 CDB4330, CDB4331, CDB4333 Figure 9. CDB4330/31/33 Component Side (top) DS136DB2 35 CDB4330, CDB4331, CDB4333 Figure 10. CDB4330/31/33 Solder Side (bottom) 36 DS136DB2 • Notes • Advance product information describes products which are in development and subject to development changes. Cirrus Logic, Inc. has made best efforts to ensure 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). No responsibility is assumed by Cirrus Logic, Inc. for the use of this information, nor for infringements of patents or other rights of third parties. This document is the property of Cirrus Logic, Inc. and implies no license under patents, copyrights, trademarks, or trade secrets. 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