PCM1792ADBG4

Burr Brown Products from Texas Instruments PCM1792A SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 24 BIT, 192 kHz SAMPLING, ADVANCED SEGMENT, AUDIO STEREO DIGITAL TO ANALOG CONVERTER FEATURES D 24-Bit Resolution D Analog Performance: − Dynamic Range: − 132 dB (9 V rms, Mono) − 129 dB (4.5 V rms, Stereo) − 127 dB (2 V rms, Stereo) − THD+N: 0.0004% − 5-V Analog, 3.3-V Digital D 5-V Tolerant Digital Inputs D Small 28-Lead SSOP Package APPLICATIONS D A/V Receivers D SACD Player D DVD Players D HDTV Receivers D Car Audio Systems D Digital Multitrack Recorders D Other Applications Requiring 24-Bit Audio DESCRIPTION The PCM1792A is a monolithic CMOS integrated circuit that includes stereo digital-to-analog converters and support circuitry in a small 28-lead SSOP package. The data converters use TI’s advanced segment DAC architecture to achieve excellent dynamic performance and improved tolerance to clock jitter. The PCM1792A provides balanced current outputs, allowing the user to optimize analog performance externally. The PCM1792A accepts PCM and DSD audio data formats, providing easy interfacing to audio DSP and decoder chips. The PCM1792A also interfaces with external digital filter devices (DF1704, DF1706, PMD200). Sampling rates up to 200 kHz are supported. A full set of user-programmable functions is accessible through an SPI or I2C serial control port, which supports register write and readback functions. The PCM1792A also supports the time division multiplexed command and audio (TDMCA) data format. D Differential Current Output: 7.8 mA p-p D 8× Oversampling Digital Filter: − Stop-Band Attenuation: –130 dB − Pass-Band Ripple: ±0.00001 dB D Sampling Frequency: 10 kHz to 200 kHz D System Clock: 128, 192, 256, 384, 512, or D Accepts 16-, 20-, and 24-Bit Audio Data D PCM Data Formats: Standard, I2S, and Left-Justified 768 fS With Autodetect D DSD Format Interface Available D Optional Interface to External Digital Filter or DSP Available D TDMCA or Serial Port (SPI/I2C) D User-Programmable Mode Controls: − Digital Attenuation: 0 dB to –120 dB, 0.5 dB/Step − Digital De-Emphasis − Digital Filter Rolloff: Sharp or Slow − Soft Mute − Zero Flag for Each Output D Dual Supply Operation: This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright  2006, Texas Instruments Incorporated PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 ORDERING INFORMATION PRODUCT PACKAGE PACKAGE CODE OPERATION TEMPERATURE RANGE −25°C to 85°C PACKAGE MARKING PCM1792A ORDERING NUMBER PCM1792ADB PCM1792ADBR TRANSPORT MEDIA Tube Tape and reel PCM1792ADB 28-lead SSOP 28DB ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range unless otherwise noted(1) PCM1792A Supply voltage VCC1, VCC2L, VCC2R VDD −0.3 V to 6.5 V −0.3 V to 4 V ±0.1 V ±0.1 V –0.3 V to 6.5 V –0.3 V to (VDD + 0.3 V) < 4 V –0.3 V to (VCC + 0.3 V) < 6.5 V ±10 mA –40°C to 125°C –55°C to 150°C 150°C 260°C, 5 s 250°C Supply voltage differences: VCC1, VCC2L and VCC2R Ground voltage differences: AGND1, AGND2, AGND3L, AGND3R, and DGND LRCK, DATA, BCK, SCK, MSEL, RST, MS(2), MDI, MC, MDO(2), ZEROL(2), ZEROR(2) Digital input voltage Analog input voltage Input current (any pins except supplies) Ambient temperature under bias Storage temperature Junction temperature Lead temperature (soldering) Package temperature (IR reflow, peak) ZEROL(3), ZEROR(3), MDO(3), MS(3) (1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) Input mode or I2C mode. (3) Output mode except for I2C mode. ELECTRICAL CHARACTERISTICS all specifications at TA = 25°C, VCC1 = VCC2L = VCC2R = 5 V, fS = 44.1 kHz, system clock = 256 fS, and 24-bit data unless otherwise noted PCM1792ADB PARAMETER RESOLUTION DATA FORMAT (PCM Mode) Audio data interface format Audio data bit length Audio data format fS Sampling frequency System clock frequency DATA FORMAT (DSD Mode) Audio data interface format Audio data bit length fS Sampling frequency System clock frequency DIGITAL INPUT/OUTPUT Logic family VIH VIL IIH IIL VOH VOL 2 Input logic level Input logic current Output logic level VIN = VDD VIN = 0 V IOH = −2 mA IOL = 2 mA 2.4 0.4 Vdc TTL compatible 2 0.8 10 –10 Vdc µA 2.8224 DSD (direct stream digital) 1 Bit 2.8224 11.2896 MHz MHz Standard, I2S, left justified 16-, 20-, 24-bit selectable MSB first, 2s complement 10 200 kHz 128, 192, 256, 384, 512, 768 fS TEST CONDITIONS MIN TYP 24 MAX UNIT Bits PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 ELECTRICAL CHARACTERISTICS (Continued) all specifications at TA = 25°C, VCC1 = VCC2L = VCC2R = 5 V, fS = 44.1 kHz, system clock = 256 fS, and 24-bit data unless otherwise noted PCM1792ADB PARAMETER TEST CONDITIONS MIN TYP 0.0004% 0.0008% 0.0015% 123 127 127 127 123 127 127 127 120 123 122 120 ±1 0.0004% 0.0008% 0.0015% 129 129 129 129 129 129 124 123 121 0.0004% 0.0008% 0.0015% 132 132 132 132 132 132 dB dB dB dB dB dB dB dB dB MAX 0.0008% UNIT DYNAMIC PERFORMANCE (PCM MODE, 2-V RMS OUTPUT) (1)(2) THD+N at VOUT = 0 dB dB fS = 44.1 kHz fS = 96 kHz fS = 192 kHz EIAJ, A-weighted, fS = 44.1 kHz Dynamic range EIAJ, A-weighted, fS = 96 kHz EIAJ, A-weighted, fS = 192 kHz EIAJ, A-weighted, fS = 44.1 kHz Signal-to-noise ratio EIAJ, A-weighted, fS = 96 kHz EIAJ, A-weighted, fS = 192 kHz Channel separation fS = 44.1 kHz fS = 96 kHz fS = 192 kHz Level Linearity Error VOUT = −120 dB DYNAMIC PERFORMANCE (PCM Mode, 4.5-V RMS Output) (1)(3) THD+N at VOUT = 0 dB dB fS = 44.1 kHz fS = 96 kHz fS = 192 kHz EIAJ, A-weighted, fS = 44.1 kHz Dynamic range EIAJ, A-weighted, fS = 96 kHz EIAJ, A-weighted, fS = 192 kHz EIAJ, A-weighted, fS = 44.1 kHz Signal-to-noise ratio EIAJ, A-weighted, fS = 96 kHz EIAJ, A-weighted, fS = 192 kHz Channel separation DYNAMIC PERFORMANCE (MONO MODE) (1)(3) THD+N at VOUT = 0 dB dB fS = 44.1 kHz fS = 96 kHz fS = 192 kHz EIAJ, A-weighted, fS = 44.1 kHz Dynamic range EIAJ, A-weighted, fS = 96 kHz EIAJ, A-weighted, fS = 192 kHz EIAJ, A-weighted, fS = 44.1 kHz Signal-to-noise ratio EIAJ, A-weighted, fS = 96 kHz EIAJ, A-weighted, fS = 192 kHz fS = 44.1 kHz fS = 96 kHz fS = 192 kHz (1) Filter condition: THD+N: 20-Hz HPF, 20-kHz apogee LPF Dynamic range: 20-Hz HPF, 20-kHz AES17 LPF, A-weighted Signal-to-noise ratio: 20-Hz HPF, 20-kHz AES17 LPF, A-weighted Channel separation: 20-Hz HPF, 20-kHz AES17 LPF Analog performance specifications are measured using the System Twot Cascade audio measurement system by Audio Precision in the averaging mode. (2) Dynamic performance and dc accuracy are specified at the output of the postamplifier as shown in Figure 36. (3) Dynamic performance and dc accuracy are specified at the output of the postamplifier as shown in Figure 37. Audio Precision and System Two are trademarks of Audio Precision, Inc. Other trademarks are the property of their respective owners. 3 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 ELECTRICAL CHARACTERISTICS (Continued) all specifications at TA = 25°C, VCC1 = VCC2L = VCC2R = 5 V, fS = 44.1 kHz, system clock = 256 fS, and 24-bit data unless otherwise noted PCM1792ADB PARAMETER DSD MODE DYNAMIC PERFORMANCE (1) (2) (44.1 kHz, 64 fS) THD+N at FS Dynamic range Signal-to-noise ratio ANALOG OUTPUT Gain error Gain mismatch, channel-to-channel Bipolar zero error Output current Center current DIGITAL FILTER PERFORMANCE De-emphasis error FILTER CHARACTERISTICS–1: SHARP ROLLOFF Pass band Stop band Pass-band ripple Stop-band attenuation Delay time FILTER CHARACTERISTICS–2: SLOW ROLLOFF Pass band Stop band Pass-band ripple Stop-band attenuation Stop band = 0.732 fS –100 ±0.04 dB –3 dB 0.732 fS ±0.001 dB dB 0.254 fS 0.46 fS Stop band = 0.546 fS –130 55/fS ±0.00001 dB –3 dB 0.546 fS ±0.00001 dB dB s 0.454 fS 0.49 fS ±0.004 dB At BPZ Full scale (0 dB) At BPZ –6 –3 –2 ±2 ±0.5 ±0.5 7.8 –6.2 6 3 2 % of FSR % of FSR % of FSR mA p-p mA 4.5 V rms –60 dB, EIAJ, A-weighted EIAJ, A-weighted 0.0005% 128 128 dB dB TEST CONDITIONS MIN TYP MAX UNIT Delay time 18/fS s (1) Filter condition: THD+N: 20-Hz HPF, 20-kHz apogee LPF Dynamic range: 20-Hz HPF, 20-kHz AES17 LPF, A-weighted Signal-to-noise ratio: 20-Hz HPF, 20-kHz AES17 LPF, A-weighted Channel separation: 20-Hz HPF, 20-kHz AES17 LPF Analog performance specifications are measured using the System Two Cascade audio measurement system by Audio Precision in the averaging mode. (2) Dynamic performance and dc accuracy are specified at the output of the postamplifier as shown in Figure 38. 4 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 ELECTRICAL CHARACTERISTICS (Continued) all specifications at TA = 25°C, VCC1 = VCC2L = VCC2R = 5 V, fS = 44.1 kHz, system clock = 256 fS, and 24-bit data unless otherwise noted PCM1792ADB PARAMETER POWER SUPPLY REQUIREMENTS VDD VCC1 VCC2L VCC2R IDD (1) Supply current (1) fS = 44.1 kHz fS = 96 kHz fS = 192 kHz fS = 44.1 kHz ICC (1) Supply current (1) fS = 96 kHz fS = 192 kHz fS = 44.1 kHz fS = 96 kHz fS = 192 kHz TEMPERATURE RANGE Operation temperature θJA Thermal resistance (1) Input is BPZ data. 28-pin SSOP –25 100 85 °C °C/W 12 23 45 33 35 37 205 250 335 250 mW 40 mA 15 mA 3 Voltage range 4.75 3.3 5 3.6 5.25 Vdc Vdc TEST CONDITIONS MIN TYP MAX UNIT (1) Power dissipation (1) PIN ASSIGNMENTS PCM1792A (TOP VIEW) ZEROL ZEROR MSEL LRCK DATA BCK SCK DGND VDD MS MDI MC MDO RST 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC2L AGND3L IOUTL− IOUTL+ AGND2 VCC1 VCOML VCOMR IREF AGND1 IOUTR− IOUTR+ AGND3R VCC2R 5 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 Terminal Functions TERMINAL NAME AGND1 AGND2 AGND3L AGND3R BCK DATA DGND IOUTL+ IOUTL– IOUTR+ IOUTR– IREF LRCK MC MDI MDO MS MSEL RST SCK VCC1 VCC2L VCC2R VCOML VCOMR VDD ZEROL PIN 19 24 27 16 6 5 8 25 26 17 18 20 4 12 11 13 10 3 14 7 23 28 15 22 21 9 1 I/O − − − − I I − O O O O − I I I I/O I/O I I I − − − − − − I/O Analog ground (internal bias) Analog ground (internal bias) Analog ground (L-channel DACFF) Analog ground (R-channel DACFF) Bit clock input(1) Serial audio data input for normal operation(1) Digital ground L-channel analog current output+ L-channel analog current output– R-channel analog current output+ R-channel analog current output– Output current reference bias pin Left and right clock (fS) input for normal operation(1) Mode control clock input(1) Mode control data input(1) Mode control readback data output(3) Mode control chip-select input(2) I2C/SPI select(1) Reset(1) System clock input(1) Analog power supply, 5 V Analog power supply (L-channel DACFF), 5 V Analog power supply (R-channel DACFF), 5 V L-channel internal bias decoupling pin R-channel internal bias decoupling pin Digital power supply, 3.3 V Zero flag for L-channel(2) DESCRIPTIONS ZEROR 2 I/O Zero flag for R-channel(2) (1) Schmitt-trigger input, 5-V tolerant (2) Schmitt-trigger input and output. 5-V tolerant input and CMOS output (3) Schmitt-trigger input and output. 5-V tolerant input. In I2C mode, this pin becomes an open-drain 3-state output; otherwise, this pin is a CMOS output. 6 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 FUNCTIONAL BLOCK DIAGRAM LRCK BCK DATA Audio Data Input I/F 8 Oversampling Digital Filter and Function Control Function Control I/F Current Segment DAC IOUTL+ IOUTL− VOUTL RST VCOML Advanced Segment DAC Modulator Bias and Vref IREF VCOMR I/V and Filter MDO MDI MC MS IOUTR− Current Segment DAC IOUTR+ I/V and Filter VOUTR MSEL ZEROL ZEROR Zero Detect System Clock Manager Power Supply AGND3L AGND3R AGND1 AGND2 VCC2L VCC2R DGND VCC1 SCK VDD 7 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 TYPICAL PERFORMANCE CURVES DIGITAL FILTER Digital Filter Response AMPLITUDE vs FREQUENCY 0 2 0.00002 AMPLITUDE vs FREQUENCY −50 Amplitude − dB 1 0.00001 Amplitude − dB −100 0 −150 −1 −0.00001 −200 0 1 2 Frequency [× fS] 3 4 −2 −0.00002 0.0 0.1 0.2 0.3 0.4 0.5 Frequency [× fS] Figure 1. Frequency Response, Sharp Rolloff AMPLITUDE vs FREQUENCY 0 Figure 2. Pass-Band Ripple, Sharp Rolloff AMPLITUDE vs FREQUENCY 0 −2 −4 −50 −6 Amplitude − dB Amplitude − dB 0 1 2 Frequency [× fS] 3 4 −8 −10 −12 −14 −150 −16 −18 −200 −20 0.0 −100 0.1 0.2 0.3 0.4 0.5 0.6 Frequency [× fS] Figure 3. Frequency Response, Slow Rolloff 8 Figure 4. Transition Characteristics, Slow Rolloff PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 De-Emphasis Filter DE-EMPHASIS LEVEL vs FREQUENCY 0 fS = 32 kHz 15 0.015 −2 De-Emphasis Level − dB De-Emphasis Error − dB 10 0.010 5 0.005 0 −5 −0.005 −10 −0.010 −15 −0.015 −10 0 2 4 6 8 10 12 14 f − Frequency − kHz −20 −0.020 0 2 4 6 8 10 12 14 f − Frequency − kHz 20 fS = 32 kHz DE-EMPHASIS ERROR vs FREQUENCY −4 −6 −8 Figure 5 DE-EMPHASIS LEVEL vs FREQUENCY 0 fS = 44.1 kHz 15 0.015 −2 De-Emphasis Level − dB De-Emphasis Error − dB 10 0.010 5 0.005 0 −5 −0.005 −10 −0.010 −15 −0.015 −10 0 2 4 6 8 10 12 14 16 18 20 f − Frequency − kHz −20 −0.020 0 2 4 20 0.020 Figure 6 DE-EMPHASIS ERROR vs FREQUENCY fS = 44.1 kHz −4 −6 −8 6 8 10 12 14 16 18 20 f − Frequency − kHz Figure 7 Figure 8 9 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 De-Emphasis Filter (Continued) DE-EMPHASIS LEVEL vs FREQUENCY 0 fS = 48 kHz 15 0.015 −2 De-Emphasis Level − dB De-Emphasis Error − dB 10 0.010 5 0.005 0 −5 −0.005 −10 −0.010 −15 −0.015 −10 0 2 4 6 8 10 12 14 16 18 20 22 f − Frequency − kHz −20 −0.020 0 2 4 6 8 10 12 14 16 18 20 22 f − Frequency − kHz 20 0.020 fS = 48 kHz DE-EMPHASIS ERROR vs FREQUENCY −4 −6 −8 Figure 9 Figure 10 10 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 ANALOG DYNAMIC PERFORMANCE Supply Voltage Characteristics TOTAL HARMONIC DISTORTION + NOISE vs SUPPLY VOLTAGE 0.01 THD+N − Total Harmonic Distortion + Noise − % 132 DYNAMIC RANGE vs SUPPLY VOLTAGE 130 fS = 96 kHz Dynamic Range − dB 128 fS = 192 kHz 126 fS = 48 kHz 0.001 fS = 192 kHz fS = 96 kHz 124 fS = 48 kHz 0.0001 4.50 122 4.50 4.75 5.00 5.25 5.50 4.75 5.00 5.25 5.50 VCC − Supply Voltage − V VCC − Supply Voltage − V Figure 11 SIGNAL-to-NOISE RATIO vs SUPPLY VOLTAGE 132 130 Figure 12 CHANNEL SEPARATION vs SUPPLY VOLTAGE SNR − Signal-to-Noise Ratio − dB 130 fS = 96 kHz 128 fS = 48 kHz 126 fS = 192 kHz Channel Separation − dB 128 126 fS = 96 kHz fS = 192 kHz fS = 48 kHz 124 124 122 122 4.50 4.75 5.00 5.25 5.50 120 4.50 4.75 5.00 5.25 5.50 VCC − Supply Voltage − V VCC − Supply Voltage − V Figure 13 NOTE: PCM mode, TA = 25°C, VDD = 3.3 V, measurement circuit is Figure 37 (VOUT = 4.5 V rms). Figure 14 11 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 Temperature Characteristics TOTAL HARMONIC DISTORTION + NOISE vs FREE-AIR TEMPERATURE 0.01 THD+N − Total Harmonic Distortion + Noise − % 132 DYNAMIC RANGE vs FREE-AIR TEMPERATURE 130 Dynamic Range − dB fS = 96 kHz fS = 48 kHz 128 fS = 192 kHz 0.001 fS = 192 kHz 126 fS = 96 kHz fS = 48 kHz 124 0.0001 −50 −25 0 25 50 75 100 122 −50 −25 0 25 50 75 100 TA − Free-Air Temperature − °C TA − Free-Air Temperature − °C Figure 15 SIGNAL-to-NOISE RATIO vs FREE-AIR TEMPERATURE 132 130 Figure 16 CHANNEL SEPARATION vs FREE-AIR TEMPERATURE SNR − Signal-to-Noise Ratio − dB 130 Channel Separation − dB fS = 96 kHz 128 fS = 192 kHz fS = 48 kHz 126 128 126 fS = 48 kHz 124 fS = 192 kHz fS = 96 kHz 122 124 122 −50 −25 0 25 50 75 100 120 −50 −25 0 25 50 75 100 TA − Free-Air Temperature − °C TA − Free-Air Temperature − °C Figure 17 Figure 18 NOTE: PCM mode, VDD = 3.3 V, VCC = 5 V, measurement circuit is Figure 37 (VOUT = 4.5 V rms). 12 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 AMPLITUDE vs FREQUENCY 0 −20 −40 −60 −80 −100 −120 −140 −160 −180 0 2 4 6 8 10 12 14 16 18 20 f − Frequency − kHz 0 −20 −40 Amplitude − dB −60 −80 −100 −120 −140 −160 0 10 20 30 AMPLITUDE vs FREQUENCY Amplitude − dB 40 50 60 70 80 90 100 f − Frequency − kHz Figure 19. −60-dB Output Spectrum, BW = 20 kHz Figure 20. −60-dB Output Spectrum, BW = 100 kHz NOTE: PCM mode, fS = 48 kHz, 32,768 point 8 average, TA = 25°C, VDD = 3.5 V VCC = 5 V, measurement circuit is Figure 37. TOTAL HARMONIC DISTORTION + NOISE vs INPUT LEVEL 10 THD+N − Total Harmonic Distortion + Noise − % 1 0.1 0.01 0.001 0.0001 −100 −80 −60 −40 −20 0 Input Level − dBFS Figure 21. THD+N vs Input Level, PCM Mode NOTE: PCM mode, fS = 48 kHz, TA = 25°C, VDD = 3.3 V, VCC = 5 V, measurement circuit is Figure 37. 13 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 AMPLITUDE vs FREQUENCY 0 −20 −40 Amplitude − dB −60 −80 −100 −120 −140 −160 0 2 4 6 8 10 12 14 16 18 20 f − Frequency − kHz Figure 22. −60-dB Output Spectrum, DSD Mode NOTE: DSD mode (FIR-4), 32,768 point 8 average, TA = 25°C, VDD = 3.3 V, VCC = 5 V, measurement circuit is Figure 38. AMPLITUDE vs FREQUENCY −130 −133 −136 −139 Amplitude − dB −142 −145 −148 −151 −154 −157 −160 0 2 4 6 8 10 12 14 16 18 20 f − Frequency − kHz Figure 23. −150-dB Output Spectrum, DSD Mono Mode NOTE: DSD mode (FIR-4), 32,768 point 8 average, TA = 25°C, VDD = 3.3 V, VCC = 5 V, measurement circuit is Figure 38. 14 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 SYSTEM CLOCK AND RESET FUNCTIONS System Clock Input The PCM1792A requires a system clock for operating the digital interpolation filters and advanced segment DAC modulators. The system clock is applied at the SCK input (pin 7). The PCM1792A has a system clock detection circuit that automatically senses if the system clock is operating between 128 fS and 768 fS. Table 1 shows examples of system clock frequencies for common audio sampling rates. If the oversampling rate of the delta-sigma modulator is selected as 128 fS, the system clock frequency is over 256 fS. Figure 24 shows the timing requirements for the system clock input. For optimal performance, it is important to use a clock source with low phase jitter and noise. One of the Texas Instruments’ PLL1700 family of multiclock generators is an excellent choice for providing the PCM1792A system clock. Table 1. System Clock Rates for Common Audio Sampling Frequencies SAMPLING FREQUENCY 32 kHz 44.1 kHz 48 kHz 96 kHz 192 kHz SYSTEM CLOCK FREQUENCY (fSCK) (MHz) 128 fS 4.096(1) 5.6488(1) 6.144(1) 12.288 24.576 192 fS 6.144(1) 8.4672 9.216 18.432 36.864 256 fS 8.192 11.2896 12.288 24.576 49.152(1) 384 fS 12.288 16.9344 18.432 36.864 73.728(1) 512 fS 16.384 22.5792 24.576 49.152(1) (2) 768 fS 24.576 33.8688 36.864 73.728(1) (2) (1) This system clock rate is not supported in I2C fast mode. (2) This system clock rate is not supported for the given sampling frequency. t(SCKH) H System Clock (SCK) L t(SCKL) t(SCY) MIN 13 0.4t (SCY) 0.4t (SCY) MAX UNITS ns ns ns 0.8 V 2V PARAMETERS t(SCY) System clock pulse cycle time t(SCKH) System clock pulse duration, HIGH t(SCKL) System clock pulse duration, LOW Figure 24. System Clock Input Timing Power-On and External Reset Functions The PCM1792A includes a power-on reset function. Figure 25 shows the operation of this function. With VDD > 2 V, the power-on reset function is enabled. The initialization sequence requires 1024 system clocks from the time VDD > 2 V. After the initialization period, the PCM1792A is set to its default reset state, as described in the MODE CONTROL REGISTERS section of this data sheet. The PCM1792A also includes an external reset capability using the RST input (pin 14). This allows an external controller or master reset circuit to force the PCM1792A to initialize to its default reset state. Figure 26 shows the external reset operation and timing. The RST pin is set to logic 0 for a minimum of 20 ns. The RST pin is then set to a logic 1 state, thus starting the initialization sequence, which requires 1024 system clock periods. The external reset is especially useful in applications where there is a delay between the PCM1792A power up and system clock activation. 15 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 VDD 2.4 V (Max) 2 V (Typ) 1.6 V (Min) Reset Internal Reset Reset Removal 1024 System Clocks System Clock Figure 25. Power-On Reset Timing RST (Pin 14) 50 % of VDD t(RST) Reset Internal Reset 1024 System Clocks System Clock PARAMETERS t(RST) Reset pulse duration, LOW MIN 20 MAX UNITS ns Reset Removal Figure 26. External Reset Timing 16 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 AUDIO DATA INTERFACE Audio Serial Interface The audio interface port is a 3-wire serial port. It includes LRCK (pin 4), BCK (pin 6), and DATA (pin 5). BCK is the serial audio bit clock, and it is used to clock the serial data present on DATA into the serial shift register of the audio interface. Serial data is clocked into the PCM1792A on the rising edge of BCK. LRCK is the serial audio left/right word clock. The PCM1792A requires the synchronization of LRCK and system clock, but does not need a specific phase relation between LRCK and system clock. If the relationship between LRCK and system clock changes more than ±6 BCK, internal operation is initialized within 1/fS and analog outputs are forced to the bipolar zero level until resynchronization between LRCK and system clock is completed. PCM Audio Data Formats and Timing The PCM1792A supports industry-standard audio data formats, including standard right-justified, I2S, and left-justified. The data formats are shown in Figure 28. Data formats are selected using the format bits, FMT[2:0], in control register 18. The default data format is 24-bit I2S. All formats require binary 2s complement, MSB-first audio data. Figure 27 shows a detailed timing diagram for the serial audio interface. LRCK t(BCH) BCK t(BCY) DATA t(DS) PARAMETERS t(BCY) t(BCL) t(BCH) t(BL) t(LB) t(DS) t(DH) — BCK pulse cycle time BCK pulse duration, LOW BCK pulse duration, HIGH BCK rising edge to LRCK edge LRCK edge to BCK rising edge DATA setup time DATA hold time LRCK clock duty t(DH) MIN 70 30 30 10 10 10 10 MAX UNITS ns ns ns ns ns ns ns t(BL) 50% of VDD t(BCL) t(LB) 50% of VDD 50% of VDD 50% ± 2 bit clocks Figure 27. Timing of Audio Interface 17 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 (1) Standard Data Format (Right-Justified); L-Channel = HIGH, R-Channel = LOW 1/fS LRCK L-Channel R-Channel BCK Audio Data Word = 16-Bit DATA 14 15 16 1 2 MSB Audio Data Word = 20-Bit DATA 18 19 20 1 2 MSB Audio Data Word = 24-Bit DATA 22 23 24 1 2 MSB 23 24 LSB 1 2 23 24 19 20 LSB 1 2 19 20 15 16 LSB 1 2 15 16 (2) Left-Justified Data Format; L-Channel = HIGH, R-Channel = LOW 1/fS LRCK L-Channel R-Channel BCK Audio Data Word = 24-Bit DATA 1 2 MSB 23 24 LSB 1 2 23 24 1 2 (3) I2S Data Format; L-Channel = LOW, R-Channel = HIGH LRCK L-Channel 1/fS R-Channel BCK Audio Data Word = 16-Bit DATA 1 2 MSB Audio Data Word = 24-Bit DATA 1 2 MSB 23 24 LSB 1 2 23 24 1 2 15 16 LSB 1 2 15 16 1 2 Figure 28. Audio Data Input Formats 18 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 External Digital Filter Interface and Timing The PCM1792A supports an external digital filter interface comprising a 3- or 4-wire synchronous serial port, which allows the use of an external digital filter. External filters include the Texas Instruments’ DF1704 and DF1706, the Pacific Microsonics PMD200, or a programmable digital signal processor. In the external DF mode, LRCK (pin 4), BCK (pin 6) and DATA (pin 5) are defined as WDCK, the word clock; BCK, the bit clock; and DATA, the monaural data. The external digital filter interface is selected by using the DFTH bit of control register 20, which functions to bypass the internal digital filter of the PCM1792A. When the DFMS bit of control register 19 is set, the PCM1792A can process stereo data. In this case, ZEROL (pin 1) and ZEROR (pin 2) are defined as L-channel data and R-channel data, respectively. Detailed information for the external digital filter interface mode is provided in the APPLICATION FOR EXTERNAL DIGITAL FILTER INTERFACE section of this data sheet. Direct Stream Digital (DSD) Format Interface and Timing The PCM1792A supports the DSD-format interface operation, which includes out-of-band noise filtering using an internal analog FIR filter. For DSD operation, SCK (pin 7) is redefined as BCK, DATA (pin 5) as DATAL (left channel audio data), and LRCK (pin 4) as DATAR (right channel audio data). BCK (pin 6) must be forced low in the DSD mode. The DSD-format interface is activated by setting the DSD bit of control register 20. Detailed information for the DSD mode is provided in the APPLICATION FOR DSD-FORMAT (DSD MODE) INTERFACE section of this data sheet. TDMCA Interface The PCM1792A supports the time-division-multiplexed command and audio (TDMCA) data format to enable control of and communication with a number of external devices over a single serial interface. Detailed information for the TDMCA format is provided in the TDMCA Format section of this data sheet. 19 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 FUNCTION DESCRIPTIONS Zero Detect The PCM1792A has a zero-detect function. When the PCM1792A detects the zero conditions as shown in Table 2, the PCM1792A sets ZEROL (pin 1) and ZEROR (pin 2) to HIGH. Table 2. Zero Conditions MODE PCM External DF Mode DZ0 DSD DZ1 DETECTING CONDITION AND TIME DATA is continuously LOW for 1024 LRCKs. DATA is continuously LOW for 1024 WDCKs. There are an equal number of 1s and 0s in every 8 bits of DSD input data for 200 ms. The input data is 1001 0110 continuously for 200 ms. Serial Control Interface The PCM1792A supports SPI and I2C serial control interfaces that set the mode control registers as shown in Table 4. This serial control interface is selected by MSEL (pin 3); SPI is activated when MSEL is set to LOW, and I2C is activated when MSEL is set to HIGH. SPI Interface The SPI interface is a 4-wire synchronous serial port which operates asynchronously to the serial audio interface and the system clock (SCK). The serial control interface is used to program and read the on-chip mode registers. The control interface includes MDO (pin 13), MDI (pin 11), MC (pin 12), and MS (pin 10). MDO is the serial data output, used to read back the values of the mode registers; MDI is the serial data input, used to program the mode registers; MC is the serial bit clock, used to shift data in and out of the control port, and MS is the mode control enable, used to enable the internal mode register access. Register Read/Write Operation All read/write operations for the serial control port use 16-bit data words. Figure 29 shows the control data word format. The most significant bit is the read/write (R/W) bit. For write operations, the R/W bit must be set to 0. For read operations, the R/W bit must be set to 1. There are seven bits, labeled IDX[6:0], that hold the register index (or address) for the read and write operations. The least significant eight bits, D[7:0], contain the data to be written to, or the data that was read from, the register specified by IDX[6:0]. Figure 30 shows the functional timing diagram for writing or reading the serial control port. MS is held at a logic 1 state until a register needs to be written or read. To start the register write or read cycle, MS is set to logic 0. Sixteen clocks are then provided on MC, corresponding to the 16 bits of the control data word on MDI and readback data on MDO. After the eighth clock cycle has completed, the data from the indexed-mode control register appears on MDO during the read operation. After the sixteenth clock cycle has completed, the data is latched into the indexed-mode control register during the write operation. To write or read subsequent data, MS must be set to 1 once. 20 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 MSB R/W IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 D7 D6 D5 D4 D3 D2 D1 LSB D0 Register Index (or Address) Register Data Figure 29. Control Data Word Format for MDI MS MC MDI R/W A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 MDO High Impedance D7 D6 D5 D4 D3 D2 D1 D0 When Read Mode is Instructed NOTE: Bit 15 is used for selection of write or read. Setting R/W = 0 indicates a write, while R/W = 1 indicates a read. Bits 14−8 are used for the register address. Bits 7–0 are used for register data. Figure 30. Serial Control Format t(MHH) MS t(MSS) t(MCH) MC t(MCY) MDI t(MDS) t(MDH) MDO 50% of VDD LSB 50% of VDD t(MCL) t(MSH) 50% of VDD 50% of VDD t(MOS) PARAMETER t(MCY) t(MCL) t(MCH) t(MHH) t(MSS) t(MSH) t(MDH) t(MDS) MC pulse cycle time MC low-level time MC high-level time MS high-level time MS falling edge to MC rising edge MS hold time(1) MDI hold time MDI setup time MIN 100 40 40 80 15 15 15 15 MAX UNITS ns ns ns ns ns ns ns ns t(MOS) MC falling edge to MDO stable (1) MC rising edge for LSB to MS rising edge 30 ns Figure 31. Control Interface Timing 21 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 I2C Interface The PCM1792A supports the I2C serial bus and the data transmission protocol for standard and fast mode as a slave device. This protocol is explained in I2C specification 2.0. In I2C mode, the control terminals are changed as follows. TERMINAL NAME MS MDI MC MDO TDMCA NAME ADR0 ADR1 SCL SDA PROPERTY Input Input Input Input/output DESCRIPTION I2C address 0 I2C address 1 I2C clock I2C data Slave Address MSB 1 0 0 1 1 ADR1 ADR0 LSB R/W The PCM1792A has 7 bits for its own slave address. The first five bits (MSBs) of the slave address are factory preset to 10011. The next two bits of the address byte are the device select bits which can be user-defined by the ADR1 and ADR0 terminals. A maximum of four PCM1792As can be connected on the same bus at one time. Each PCM1792A responds when it receives its own slave address. Packet Protocol A master device must control packet protocol, which consists of start condition, slave address, read/write bit, data if write or acknowledge if read, and stop condition. The PCM1792A supports only slave receivers and slave transmitters. SDA SCL St 1−7 Slave Address 8 R/W 9 ACK 1−8 DATA 9 ACK 1−8 DATA 9 ACK 9 ACK Sp Start Condition Write Operation Transmitter Data Type R/W: Read Operation if 1; Otherwise, Write Operation DATA: 8 Bits (Byte) ACK: Acknowledgement of a Byte if 0 NACK:Not Acknowledgement if 1 M Slave Address M W S ACK M DATA S ACK M DATA S ACK S ACK Stop Condition M St M Sp Read Operation Transmitter Data Type M St M Slave Address M R S ACK S DATA M ACK S DATA M ACK M NACK M Sp M: Master Device St: Start Condition S: Slave Device Sp: Stop Condition W: Write R: Read Figure 32. Basic I2C Framework 22 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 Write Register A master can write to any PCM1792A registers using single or multiple accesses. The master sends a PCM1792A slave address with a write bit, a register address, and the data. If multiple access is required, the address is that of the starting register, followed by the data to be transferred. When the data are received properly, the index register is incremented by 1 automatically. When the index register reaches 0x7F, the next value is 0x0. When undefined registers are accessed, the PCM1792A does not send an acknowledgement. Figure 33 is a diagram of the write operation. Transmitter Data Type M St M Slave Address M W S ACK M Reg Address S ACK M Write Data 1 S ACK M Write Data 2 S ACK S ACK M Sp M: Master Device St: Start Condition S: Slave Device ACK: Acknowledge Sp: Stop Condition W: Write Figure 33. Write Operation Read Register A master can read the PCM1792A register. The value of the register address is stored in an indirect index register in advance. The master sends a PCM1792A slave address with a read bit after storing the register address. Then the PCM1792A transfers the data which the index register points to. When the data are transferred during a multiple access, the index register is incremented by 1 automatically. (When first going into read mode immediately following a write, the index register is not incremented. The master can read the register that was previously written.) When the index register reaches 0x7F, the next value is 0x0. The PCM1792A outputs some data when the index register is 0x10 to 0x1F, even if it is not defined in Table 4. Figure 34 is a diagram of the read operation. Transmitter Data Type M St M Slave Address M W S M S M Sr M Slave Address M R S ACK Slave Data M ACK S NACK M Sp ACK Reg Address ACK M: Master Device St: Start Condition W: Write S: Slave Device Sr: Repeated Start Condition ACK: Acknowledge R: Read Sp: Stop Condition NACK: Not Acknowledge Figure 34. Read Operation Noise Suppression The PCM1792A incorporates noise suppression using the system clock (SCK). However, there must be no more than two noise spikes in 600 ns. The noise suppression works for SCK frequencies between 8 MHz and 40 MHz in fast mode. However, it works incorrectly in the following conditions. Case 1: 1. t(SCK) > 120 ns (t(SCK): period of SCK) 2. t(HI) + t(D−HD) < t(SCK) × 5 3. Spike noise exists on the first half of the SCL HIGH pulse. 4. Spike noise exists on the SDA HIGH pulse just before SDA goes LOW. SCL Noise SDA When these conditions occur at the same time, the data is recognized as LOW. 23 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 Case 2: 1. t(SCK) > 120 ns 2. t(S−HD) or t(RS−HD) < t(SCK) × 5 3. Spike noise exists on both SCL and SDA during the hold time. SCL Noise SDA When these conditions occur at the same time, the PCM1792A fails to detect a start condition. Case 3: 1. t(SCK) < 50 ns 2. t(SP) > t(SCK) 3. Spike noise exists on SCL just after SCL goes LOW. 4. Spike noise exists on SDA just before SCL goes LOW. SCL SDA Noise When these conditions occur at the same time, the PCM1792A erroneously detects a start or stop condition. 24 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 TIMING DIAGRAM Start Repeated Start t(D-HD) t(BUF) t(D-SU) t(SDA-R) t(SDA-F) t(P-SU) Stop SDA t(SCL-R) t(LOW) SCL t(RS-HD) t(SP) t(S-HD) t(SCL-F) t(HI) t(RS-SU) TIMING CHARACTERISTICS PARAMETER f(SCL) t(BUF) t(LOW) t(HI) t(RS-SU) (RS-SU) t(S-HD) t(RS-HD) t(D-SU) t(D-HD) t(SCL-R) SCL clock frequency Bus free time between stop and start conditions Low period of the SCL clock High period of the SCL clock Setup time for (repeated) start condition Hold time for (repeated) start condition Data setup time Data hold time Rise time of SCL signal CONDITIONS Standard Fast Standard Fast Standard Fast Standard Fast Standard Fast Standard Fast Standard Fast Standard Fast Standard Fast Standard Fast Standard Fast Standard Fast Standard Fast Standard Fast Fast Standard VNH Noise margin at high level for each connected device (including hysteresis) Fast 0.2 VDD V 25 4.7 1.3 4.7 1.3 4 600 4.7 600 4 600 250 100 0 0 20 + 0.1 CB 20 + 0.1 CB 20 + 0.1 CB 20 + 0.1 CB 20 + 0.1 CB 20 + 0.1 CB 20 + 0.1 CB 20 + 0.1 CB 20 + 0.1 CB 20 + 0.1 CB 4 600 400 50 900 900 1000 300 1000 300 1000 300 1000 300 1000 300 MIN MAX 100 400 UNIT kHz µs µs µs ns µs ns µs ns ns ns ns ns ns ns ns µs ns pF ns Rise time of SCL signal after a repeated start condition and after an t(SCL-R1) (SCL-R1) acknowledge bit t(SCL-F) t(SDA-R) (SDA-R) t(SDA-F) t(P-SU) C(B) t(SP) Fall time of SCL signal Rise time of SDA signal Fall time of SDA signal Setup time for stop condition Capacitive load for SDA and SCL lines Pulse duration of suppressed spike PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 MODE CONTROL REGISTERS User-Programmable Mode Controls The PCM1792A includes a number of user-programmable functions which are accessed via mode control registers. The registers are programmed using the serial control interface, which was previously discussed in this data sheet. Table 3 lists the available mode-control functions, along with their default reset conditions and associated register index. Table 3. User-Programmable Function Controls FUNCTION Digital attenuation control 0 dB to –120 dB and mute, 0.5 dB/step Attenuation load control Disabled, enabled Input audio data format selection 16-, 20-, 24-bit standard (right-justified) format 24-bit MSB-first left-justified format 16-/24-bit I2S format Sampling rate selection for de-emphasis Disabled, 44.1 kHz, 48 kHz, 32 kHz De-emphasis control Disabled, enabled Soft mute control Mute disabled, enabled Output phase reversal Normal, reverse Attenuation speed selection ×1 fS, ×(1/2) fS, ×(1/4) fS, ×(1/8) fS DAC operation control Enabled, disabled Stereo DF bypass mode select Monaural, stereo Digital filter rolloff selection Sharp rolloff, slow rolloff Infinite zero mute control Disabled, enabled System reset control Reset operation, normal operation DSD interface mode control DSD enabled, disabled Digital-filter bypass control DF enabled, DF bypass Monaural mode selection Stereo, monaural Channel selection for monaural mode data L-channel, R-channel Delta-sigma oversampling rate selection ×64 fS, ×128 fS, ×32 fS PCM zero output enable DSD zero output enable Function available only for read Zero detection flag Not zero, zero detected Not zero = 0 Zero detected = 1 Register 22 ZFGL (for L-ch) ZFGR (for R-ch) yes yes yes yes 0 dB Attenuation disabled 24-bit I2S format DEFAULT REGISTER Register 16 Register 17 Register 18 Register 18 BIT ATL[7:0] (for L-ch) ATR[7:0] (for R-ch) ATLD FMT[2:0] PCM yes yes yes yes DSD DF BYPASS De-emphasis disabled De-emphasis disabled Mute disabled Normal ×1 fS DAC operation enabled Monaural Sharp rolloff Disabled Normal operation Disabled DF enabled Stereo L-channel ×64 fS Enabled Disabled Register 18 Register 18 Register 18 Register 19 Register 19 Register 19 Register 19 Register 19 Register 19 Register 20 Register 20 Register 20 Register 20 Register 20 Register 20 Register 21 Register 21 DMF[1:0] DME MUTE REV ATS[1:0] OPE DFMS FLT INZD SRST DSD DFTH MONO CHSL OS[1:0] PCMZ DZ[1:0] yes yes yes yes yes yes yes(1) yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes(2) yes yes yes yes yes yes yes yes yes Device ID (at TDMCA) — Register 23 ID[4:0] (1) When in DSD mode, DMF[1:0] is defined as DSD filter (analog FIR) performance selection. (2) When in DSD mode, OS[1:0] is defined as DSD filter (analog FIR) operation rate selection. 26 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 Register Map The mode control register map is shown in Table 4. Registers 16–21 include an R/W bit, which determines whether a register read (R/W = 1) or write (R/W = 0) operation is performed. Registers 22 and 23 are read-only. Table 4. Mode Control Register Map B15 Register 16 Register 17 Register 18 Register 19 Register 20 Register 21 Register 22 Register 23 R/W R/W R/W R/W R/W R/W R R B14 0 0 0 0 0 0 0 0 B13 0 0 0 0 0 0 0 0 B12 1 1 1 1 1 1 1 1 B11 0 0 0 0 0 0 0 0 B10 0 0 0 0 1 1 1 1 B9 0 0 1 1 0 0 1 1 B8 0 1 0 1 0 1 0 1 B7 ATL7 ATR7 ATLD REV RSV RSV RSV RSV B6 ATL6 ATR6 FMT2 ATS1 SRST RSV RSV RSV B5 ATL5 ATR5 FMT1 ATS0 DSD RSV RSV RSV B4 ATL4 ATR4 FMT0 OPE DFTH RSV RSV ID4 B3 ATL3 ATR3 DMF1 RSV MONO RSV RSV ID3 B2 ATL2 ATR2 DMF0 DFMS CHSL DZ1 RSV ID2 B1 ATL1 ATR1 DME FLT OS1 DZ0 ZFGR ID1 B0 ATL0 ATR0 MUTE INZD OS0 PCMZ ZFGL ID0 Register Definitions B15 Register 16 Register 17 R/W R/W B14 0 0 B13 0 0 B12 1 1 B11 0 0 B10 0 0 B9 0 0 B8 0 1 B7 ATL7 B6 ATL6 B5 ATL5 B4 ATL4 B3 ATL3 ATR3 B2 ATL2 ATR2 B1 ATL1 ATR1 B0 ATL0 ATR0 ATR7 ATR6 ATR5 ATR4 R/W: Read/Write Mode Select When R/W = 0, a write operation is performed. When R/W = 1, a read operation is performed. Default value: 0 ATx[7:0]: Digital Attenuation Level Setting These bits are available for read and write. Default value: 1111 1111b Each DAC output has a digital attenuator associated with it. The attenuator can be set from 0 dB to –120 dB, in 0.5-dB steps. Alternatively, the attenuator can be set to infinite attenuation (or mute). The attenuation data for each channel can be set individually. However, the data load control (the ATLD bit of control register 18) is common to both attenuators. ATLD must be set to 1 in order to change an attenuator setting. The attenuation level can be set using the following formula: Attenuation level (dB) = 0.5 dB • (ATx[7:0] DEC – 255) where: ATx[7:0]DEC = 0 through 255 For ATx[7:0]DEC = 0 through 14, the attenuator is set to infinite attenuation. The following table shows attenuation levels for various settings: ATx[7:0] 1111 1111b 1111 1110b 1111 1101b L 0001 0000b 0000 1111b 0000 1110b L 0000 0000b Decimal Value 255 254 253 L 16 15 14 L 0 Attenuation Level Setting 0 dB, no attenuation (default) –0.5 dB –1.0 dB L –119.5 dB –120.0 dB Mute L Mute 27 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 B15 Register 18 R/W B14 0 B13 0 B12 1 B11 0 B10 0 B9 1 B8 0 B7 ATLD B6 FMT2 B5 FMT1 B4 FMT0 B3 B2 B1 DME B0 MUTE DMF1 DMF0 R/W: Read/Write Mode Select When R/W = 0, a write operation is performed. When R/W = 1, a read operation is performed. Default value: 0 ATLD: Attenuation Load Control This bit is available for read and write. Default value: 0 ATLD = 0 ATLD = 1 Attenuation control disabled (default) Attenuation control enabled The ATLD bit is used to enable loading of the attenuation data contained in registers 16 and 17. When ATLD = 0, the attenuation settings remain at the previously programmed levels, ignoring new data loaded from registers 16 and 17. When ATLD = 1, attenuation data written to registers 16 and 17 is loaded normally. FMT[2:0]: Audio Interface Data Format These bits are available for read and write. Default value: 101 For the external digital filter interface mode (DFTH mode), this register is operated as shown in the Application for Interfacing With an External Digital Filter section of this data sheet. FMT[2:0] 000 001 010 011 100 101 110 111 Audio Data Format Selection 16-bit standard, right-justified format data 20-bit standard, right-justified format data 24-bit standard, right-justified format data 24-bit MSB-first, left-justified format data 16-bit I2S format data 24-bit I2S format data (default) Reserved Reserved The FMT[2:0] bits are used to select the data format for the serial audio interface. DMF[1:0]: Sampling Frequency Selection for the De-Emphasis Function These bits are available for read and write. Default value: 00 DMF[1:0] 00 01 10 11 De-Emphasis Sampling Frequency Selection Disabled (default) 48 kHz 44.1 kHz 32 kHz The DMF[1:0] bits are used to select the sampling frequency used by the digital de-emphasis function when it is enabled by setting the DME bit. The de-emphasis curves are shown in the TYPICAL PERFORMANCE CURVES section of this data sheet. For the DSD mode, analog FIR filter performance can be selected using this register. Filter response plots are shown in the TYPICAL PERFORMANCE CURVES section of this data sheet. A register map is shown in the Configuration for the DSD Interface Mode section of this data sheet. 28 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 DME: Digital De-Emphasis Control This bit is available for read and write. Default value: 0 DME = 0 DME = 1 De-emphasis disabled (default) De-emphasis enabled The DME bit is used to enable or disable the de-emphasis function for both channels. MUTE: Soft Mute Control This bit is available for read and write. Default value: 0 MUTE = 0 MUTE = 1 MUTE disabled (default) MUTE enabled The MUTE bit is used to enable or disable the soft mute function for both channels. Soft mute is operated as a 256-step attenuator. The speed for each step to – ∞ dB (mute) is determined by the attenuation rate selected in the ATS register. B15 Register 19 R/W B14 0 B13 0 B12 1 B11 0 B10 0 B9 1 B8 1 B7 REV B6 ATS1 B5 ATS0 B4 OPE B3 RSV B2 DFMS B1 FLT B0 INZD R/W: Read/Write Mode Select When R/W = 0, a write operation is performed. When R/W = 1, a read operation is performed. Default value: 0 REV: Output Phase Reversal This bit is available for read and write. Default value: 0 REV = 0 REV = 1 Normal output (default) Inverted output The REV bit is used to invert the output phase for both channels. ATS[1:0]: Attenuation Rate Select These bits are available for read and write. Default value: 00 ATS[1:0] 00 01 10 11 Attenuation Rate Selection LRCK/1 (default) LRCK/2 LRCK/4 LRCK/8 The ATS[1:0] bits are used to select the rate at which the attenuator is decremented/incremented during level transitions. 29 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 OPE: DAC Operation Control This bit is available for read and write. Default value: 0 OPE = 0 OPE = 1 DAC operation enabled (default) DAC operation disabled The OPE bit is used to enable or disable the analog output for both channels. Disabling the analog outputs forces them to the bipolar zero level (BPZ) even if digital audio data is present on the input. DFMS: Stereo DF Bypass Mode Select This bit is available for read and write. Default value: 0 DFMS = 0 DFMS = 1 Monaural (default) Stereo input enabled The DFMS bit is used to enable stereo operation in DF bypass mode. In the DF bypass mode, when DFMS is set to 0, the pin for the input data is DATA (pin 5) only, therefore the PCM1792A operates as a monaural DAC. When DFMS is set to 1, the PCM1792A can operate as a stereo DAC with inputs of L-channel and R-channel data on ZEROL (pin 1) and ZEROR (pin 2), respectively. FLT: Digital Filter Rolloff Control This bit is available for read and write. Default value: 0 FLT = 0 FLT = 1 Sharp rolloff (default) Slow rolloff The FLT bit is used to select the digital filter rolloff characteristic. The filter responses for these selections are shown in the TYPICAL PERFORMANCE CURVES section of this data sheet. INZD: Infinite Zero Detect Mute Control This bit is available for read and write. Default value: 0 INZD = 0 INZD = 1 Infinite zero detect mute disabled (default) Infinite zero detect mute enabled The INZD bit is used to enable or disable the zero detect mute function. Setting INZD to 1 forces muted analog outputs to hold a bipolar zero level when the PCM1792A detects a zero condition in both channels. The infinite zero detect mute function is disabled in the DSD mode. B15 Register 20 R/W B14 0 B13 0 B12 1 B11 0 B10 1 B9 0 B8 0 B7 RSV B6 SRST B5 DSD B4 DFTH B3 MONO B2 CHSL B1 OS1 B0 OS0 R/W: Read/Write Mode Select When R/W = 0, a write operation is performed. When R/W = 1, a read operation is performed. Default value: 0 30 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 SRST: System Reset Control This bit is available for write only. Default value: 0 SRST = 0 SRST = 1 Normal operation (default) System reset operation (generate one reset pulse) The SRST bit is used to reset the PCM1792A to the initial system condition. DSD: DSD Interface Mode Control This bit is available for read and write. Default value: 0 DSD = 0 DSD = 1 DSD interface mode disabled (default) DSD interface mode enabled The DSD bit is used to enable or disable the DSD interface mode. DFTH: Digital Filter Bypass (or Through Mode) Control This bit is available for read and write. Default value: 0 DFTH = 0 DFTH = 1 Digital filter enabled (default) Digital filter bypassed for external digital filter The DFTH bit is used to enable or disable the external digital filter interface mode. MONO: Monaural Mode Selection This bit is available for read and write. Default value: 0 MONO = 0 MONO = 1 Stereo mode (default) Monaural mode The MONO function is used to change operation mode from the normal stereo mode to the monaural mode. When the monaural mode is selected, both DACs operate in a balanced mode for one channel of audio input data. Channel selection is available for L-channel or R-channel data, determined by the CHSL bit as described immediately following. CHSL: Channel Selection for Monaural Mode This bit is available for read and write. Default value: 0 This bit is available when MONO = 1. CHSL = 0 CHSL = 1 L-channel selected (default) R-channel selected The CHSL bit selects L-channel or R-channel data to be used in monaural mode. 31 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 OS[1:0]: Delta-Sigma Oversampling Rate Selection These bits are available for read and write. Default value: 00 OS[1:0] 00 01 10 11 Operation Speed Select 64 times fS (default) 32 times fS 128 times fS Reserved The OS bits are used to change the oversampling rate of delta-sigma modulation. Use of this function enables the designer to stabilize the conditions at the post low-pass filter for different sampling rates. As an application example, programming to set 128 times in 44.1-kHz operation, 64 times in 96-kHz operation, and 32 times in 192-kHz operation allows the use of only a single type (cutoff frequency) of post low-pass filter. The 128 fS oversampling rate is not available at sampling rates above 100 kHz. If the 128-fS oversampling rate is selected, a system clock of more than 256 fS is required. In DSD mode, these bits are used to select the speed of the bit clock for DSD data coming into the analog FIR filter. B15 Register 21 R/W B14 0 B13 0 B12 1 B11 0 B10 1 B9 0 B8 1 B7 RSV B6 RSV B5 RSV B4 RSV B3 RSV B2 DZ1 B1 DZ0 B0 PCMZ R/W: Read/Write Mode Select When R/W = 0, a write operation is performed. When R/W = 1, a read operation is performed. Default value: 0 DZ[1:0]: DSD Zero Output Enable These bits are available for read and write. Default value: 00 DZ[1:0] 00 01 1x Zero Output Enable Disabled (default) Even pattern detect 96H pattern detect The DZ bits are used to enable or disable the output zero flags, and to select the zero pattern in the DSD mode. PCMZ: PCM Zero Output Enable These bits are available for read and write. Default value: 1 PCMZ = 0 PCMZ = 1 PCM zero output disabled PCM zero output enabled (default) The PCMZ bit is used to enable or disable the output zero flags in the PCM mode and the external DF mode. B15 Register 22 R B14 0 B13 0 B12 1 B11 0 B10 1 B9 1 B8 0 B7 RSV B6 RSV B5 RSV B4 RSV B3 RSV B2 RSV B1 ZFGR B0 ZFGL R: Read Mode Select Value is always 1, specifying the readback mode. 32 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 ZFGx: Zero-Detection Flag Where x = L or R, corresponding to the DAC output channel. These bits are available only for readback. Default value: 00 ZFGx = 0 ZFGx = 1 Not zero Zero detected These bits show zero conditions. Their status is the same as that of the zero flags at ZEROL (pin 1) and ZEROR (pin 2). See Zero Detect in the FUNCTION DESCRIPTIONS section. B15 Register 23 R B14 0 B13 0 B12 1 B11 0 B10 1 B9 1 B8 1 B7 RSV B6 RSV B5 RSV B4 ID4 B3 ID3 B2 ID2 B1 ID1 B0 ID0 R: Read Mode Select Value is always 1, specifying the readback mode. ID[4:0]: Device ID The ID[4:0] bits hold a device ID in the TDMCA mode. TYPICAL CONNECTION DIAGRAM IN PCM MODE 5V 0.1 µF + 1 2 3 4 PCM Audio Data Source 5 6 7 0.1 µF 8 9 ZEROL ZEROR MSEL LRCK DATA BCK SCK DGND VDD PCM1792A VCC2L AGND3L 28 27 10 µF − + Cf Rf 5V − + + 47 µF 10 kΩ − + Cf 0.1 µF 5V − 10 µF + + Rf Differential to Single Converter With Low-Pass Filter 47 µF 10 µF + + Cf Rf IOUTL− 26 IOUTL+ AGND2 VCC1 VCOML VCOMR IREF AGND1 IOUTR− IOUTR+ AGND3R VCC2R 25 24 23 22 21 20 19 18 17 16 15 Differential to Single Converter With Low-Pass Filter Cf Rf VOUT L-Channel 10 MS 11 MDI Controller 12 MC 13 MDO 14 RST 3.3 V + 10 µF VOUT R-Channel Figure 35. Typical Application Circuit for Standard PCM Audio Operation 33 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 APPLICATION INFORMATION APPLICATION CIRCUIT The design of the application circuit is important in order to actually realize the high S/N ratio of which the PCM1792A is capable. This is because noise and distortion that are generated in an application circuit are not negligible. In the circuit of Figure 36, the output level is 2 V rms and 127 dB S/N is achieved. The circuit of Figure 37 can realize the highest performance. In this case the output level is set to 4.5 V rms and 129 dB S/N is achieved (stereo mode). In monaural mode, if the output of the L-channel and R-channel is used as a balanced output, 132 dB S/N is achieved (see Figure 39). Figure 38 shows a circuit for the DSD mode, which is a 4th-order LPF in order to reduce the out-of-band noise. I/V Section The current of the PCM1792A on each of the output pins (IOUTL+, IOUTL–, IOUTR+, IOUTR–) is 7.8 mA p-p at 0 dB (full scale). The voltage output level of the I/V converter (Vi) is given by following equation: Vi = 7.8 mA p-p × Rf (Rf : feedback resistance of I/V converter) An NE5534 operational amplifier is recommended for the I/V circuit to obtain the specified performance. Dynamic performance such as the gain bandwidth, settling time, and slew rate of the operational amplifier affects the audio dynamic performance of the I/V section. Differential Section The PCM1792A voltage outputs are followed by differential amplifier stages, which sum the differential signals for each channel, creating a single-ended I/V op-amp output. In addition, the differential amplifiers provide a low-pass filter function. The operational amplifier recommended for the IV circuit is the NE5534, and the operational amplifier recommended for the differential circuit is the Linear Technology LT1028, because its input noise is low. 34 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 C1 2200 pF R1 750 Ω VCC VCC C11 0.1 µF C17 22 pF 5 – + 4 8 6 U1 NE5534 C12 0.1 µF VEE C2 2200 pF R4 560 Ω R3 560 Ω C3 2700 pF R5 270 Ω C15 0.1 µF C19 33 pF 5 – + 4 U3 LT1028 C16 0.1 µF VEE 6 R7 100 Ω 7 IOUT– 2 3 7 2 3 R6 270 Ω C4 2700 pF R2 750 Ω VCC C13 0.1 µF C18 22 pF 5 – + 4 8 6 U2 NE5534 C14 0.1 µF VEE VCC = 15 V VEE = –15 V fc = 217 kHz 7 IOUT+ 2 3 Figure 36. Measurement Circuit for PCM, VOUT = 2 V rms 35 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 C1 2200 pF R1 820 Ω VCC VCC C11 0.1 µF C17 22 pF 5 – + 4 8 6 U1 NE5534 C12 0.1 µF VEE C2 2200 pF R4 360 Ω R3 360 Ω C3 2700 pF R5 360 Ω C15 0.1 µF C19 33 pF 5 – + 4 U3 LT1028 C16 0.1 µF VEE 6 R7 100 Ω 7 IOUT– 2 3 7 2 3 R6 360 Ω C4 2700 pF R2 820 Ω VCC C13 0.1 µF C18 22 pF 5 – + 4 8 6 U2 NE5534 C14 0.1 µF VEE VCC = 15 V VEE = –15 V fc = 162 kHz 7 IOUT+ 2 3 Figure 37. Measurement Circuit for PCM, VOUT = 4.5 V rms 36 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 C1 2200 pF R1 820 Ω VCC VCC C11 0.1 µF C17 22 pF 5 – + 4 8 6 U1 NE5534 C12 0.1 µF VEE C2 2200 pF R4 110 Ω R3 110 Ω R8 220 Ω C3 18000 pF R9 220 Ω C5 10000 pF R5 330 Ω C15 0.1 µF C19 33 pF 5 – + 4 U3 LT1028 C14 0.1 µF VEE 6 R7 100 Ω 7 IOUT– 2 3 R10 68 Ω C4 47000 pF R11 68 Ω C6 10000 pF 7 2 3 R6 330 Ω R2 820 Ω VCC C13 0.1 µF C18 22 pF 5 – + 4 8 6 U2 NE5534 C14 0.1 µF VEE VCC = 15 V VEE = –15 V fc = 38 kHz 7 IOUT+ 2 3 Figure 38. Measurement Circuit for DSD 37 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 IOUTL– (Pin 26) IOUTL+ (Pin 25) IOUT– IOUT+ Figure 37 Circuit OUT+ 3 1 2 IOUTR– (Pin 18) IOUTR+ (Pin 17) IOUT– Figure 37 Circuit IOUT+ OUT– Balanced Out Figure 39. Measurement Circuit for Monaural Mode APPLICATION FOR EXTERNAL DIGITAL FILTER INTERFACE DFMS = 0 External Filter Device 1 2 3 WDCK (Word Clock) DATA BCK SCK 4 5 6 7 ZEROL ZEROR MSEL LRCK DATA BCK SCK PCM1792A DFMS = 1 External Filter Device DATA_L DATA_R 1 2 3 WDCK (Word Clock) 4 5 BCK SCK 6 7 ZEROL ZEROR MSEL LRCK DATA BCK SCK PCM1792A Figure 40. Connection Diagram for External DIgital Filter (Internal DF Bypass Mode) Application 38 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 Application for Interfacing With an External Digital Filter For some applications, it may be desirable to use an external digital filter to perform the interpolation function, as it can provide improved stop-band attenuation when compared to the internal digital filter of the PCM1792A. The PCM1792A supports several external digital filters, including: D Texas Instruments DF1704 and DF1706 D Pacific Microsonics PMD200 HDCD filter/decoder IC D Programmable digital signal processors The external digital filter application mode is accessed by programming the following bits in the corresponding control register: D DFTH = 1 (register 20) The pins used to provide the serial interface for the external digital filter are shown in the connection diagram of Figure 40. The word (WDCK) signal must be operated at 8× or 4× the desired sampling frequency, fS. System Clock (SCK) and Interface Timing The PCM1792A in an application using an external digital filter requires the synchronization of WDCK and the system clock. The system clock is phase-free with respect to WDCK. Interface timing among WDCK, BCK, DATAL, and DATAR is shown in Figure 42. Audio Format The PCM1792A in the external digital filter interface mode supports right-justified audio formats including 16-bit, 20-bit, and 24-bit audio data, as shown in Figure 41. The audio format is selected by the FMT[2:0] bits of control register 18. 1/4 fS or 1/8 fS WDCK BCK Audio Data Word = 16-Bit DATA 15 16 1 2 3 MSB Audio Data Word = 20-Bit DATA 19 20 1 2 3 MSB Audio Data Word = 24-Bit DATA 23 24 1 2 3 MSB 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 LSB 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 LSB 4 5 6 7 8 9 10 11 12 13 14 15 16 LSB Figure 41. Audio Data Input Format for External Digital Filter (Internal DF Bypass Mode) Application 39 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 WDCK (LRCK) t(BCH) BCK t(BCY) DATA t(DS) PARAMETER t(BCY) BCK pulse cycle time t(BCL) BCK pulse duration, LOW t(BCH) BCK pulse duration, HIGH t(BL) BCK rising edge to WDCK falling edge t(LB) t(DS) t(DH) WDCK falling edge to BCK rising edge DATA setup time DATA hold time t(DH) MIN 20 7 7 5 5 5 5 MAX UNITS ns ns ns ns ns ns ns t(BL) t(BCL) t(LB) 50% of VDD 50% of VDD 50% of VDD Figure 42. Audio Interface Timing for External Digital Filter (Internal DF Bypass Mode) Application Functions Available in the External Digital Filter Mode The external digital filter mode allows access to the majority of the PCM1792A mode control functions. The following table shows the register mapping available when the external digital filter mode is selected, along with descriptions of functions which are modified when using this mode selection. B15 Register 16 Register 17 Register 18 Register 19 Register 20 Register 21 Register 22 R/W R/W R/W R/W R/W R/W R B14 0 0 0 0 0 0 0 B13 0 0 0 0 0 0 0 B12 1 1 1 1 1 1 1 B11 0 0 0 0 0 0 0 B10 0 0 0 0 1 1 1 B9 0 0 1 1 0 0 1 B8 0 1 0 1 0 1 0 B7 – – – REV – – – B6 – – FMT2 – SRST – – B5 – – FMT1 – 0 – – B4 – – FMT0 OPE 1 – – B3 – – – – MONO – – B2 – – – DFMS CHSL – – B1 – – – – OS1 – ZFGR B0 – – – INZD OS0 PCMZ ZFGL NOTE: 1: Bit is required for selection of external digital filter mode. –: Function is disabled. No operation even if data bit is set FMT[2:0]: Audio Data Format Selection Default value: 000 FMT[2:0] 000 001 010 Other Audio Data Format Select 16-bit right-justified format (default) 20-bit right-justified format 24-bit right-justified format N/A 40 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 OS[1:0]: Delta-Sigma Modulator Oversampling Rate Selection Default value: 00 OS[1:0] 00 01 10 11 Operation Speed Select 8 times WDCK (default) 4 times WDCK 16 times WDCK Reserved The effective oversampling rate is determined by the oversampling performed by both the external digital filter and the delta-sigma modulator. For example, if the external digital filter is 8× oversampling, and the user selects OS[1:0] = 00, then the delta-sigma modulator oversamples by 8×, resulting in an effective oversampling rate of 64×. The 16× WDCK oversampling rate is not available above a 100-kHz sampling rate. If the oversampling rate selected is 16× WDCK, the system clock frequency must be over 256 fS. APPLICATION FOR DSD FORMAT (DSD MODE) INTERFACE DSD Decoder ZEROL ZEROR MSEL LRCK DATA BCK SCK PCM1792A 1 2 3 DATA_R DATA_L 4 5 6 Bit Clock 7 Figure 43. Connection Diagram in DSD Mode Feature This mode is used for interfacing directly to a DSD decoder, which is found in Super Audio CDt (SACD) applications. The DSD mode is accessed by programming the following bit in the corresponding control register. DSD = 1 (register 20) The DSD mode provides a low-pass filtering function. The filtering is provided using an analog FIR filter structure. Four FIR responses are available and are selected by the DMF[1:0] bits of control register 18. The DSD bit must be set before inputting DSD data; otherwise, the PCM1792A erroneously detects the TDMCA mode, and commands are not accepted through the serial control interface. Super Audio CD is a trademark of Sony Kabushiki Kaisha TA Sony Corporation, Japan. 41 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 Pin Assignment When Using DSD Format Interface Several pins are redefined for DSD mode operation. These include: D D D D DATA (pin 5): DSDL as L-channel DSD data input LRCK (pin 4): DSDR as R-channel DSD data input SCK (pin 7): DBCK as bit-clock input BCK (pin 6): Set LOW (N/A) t = 1/(64 × 44.1 kHz) DBCK DSDL DSDR D0 D1 D2 D3 D4 Figure 44. Normal Data Output Form From DSD Decoder t(BCH) DBCK t(BCY) DSDL DSDR t(DS) t(BCL) 50% of VDD 50% of VDD t(DH) PARAMETER t(BCY) DBCK pulse cycle time t(BCH) DBCK high-level time t(BCL) DBCK low-level time t(DS) DSDL, DSDR setup time MIN 85(1) 30 30 10 MAX UNITS ns ns ns ns t(DH) DSDL, DSDR hold time 10 ns (1) 2.8224 MHz × 4. (2.8224 MHz = 64 × 44.1 kHz. This value is specified as a sampling rate of DSD.) Figure 45. Timing for DSD Audio Interface 42 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 ANALOG FIR FILTER PERFORMANCE IN DSD MODE GAIN vs FREQUENCY 0 0 fc = 185 kHz Gain(1) = –6.6 dB −1 −10 GAIN vs FREQUENCY −2 Gain – dB Gain – dB 0 50 100 f – Frequency – kHz 150 200 −20 −3 −30 −4 −40 −5 −50 −6 −60 0 500 1000 1500 f – Frequency – kHz Figure 46. DSD Filter-1, Low BW GAIN vs FREQUENCY 0 0 Figure 47. DSD Filter-1, High BW GAIN vs FREQUENCY fc = 77 kHz Gain(1) = –6 dB −1 −10 −2 Gain – dB Gain – dB 0 50 100 f – Frequency – kHz 150 200 −20 −3 −30 −4 −40 −5 −50 −6 −60 0 500 1000 1500 f – Frequency – kHz Figure 48. DSD Filter-2, Low BW Figure 49. DSD Filter-2, High BW (1) This gain is in comparison to PCM 0 dB, when the DSD input signal efficiency is 50%. All specifications at DBCK = 2.8224 MHz (44.1 kHz × 64 fS), and 50% modulation DSD data input, unless otherwise noted. 43 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 GAIN vs FREQUENCY 0 0 GAIN vs FREQUENCY fc = 85 kHz Gain(1) = –1.5 dB −1 −10 −2 Gain – dB Gain – dB 0 50 100 f – Frequency – kHz 150 200 −20 −3 −30 −4 −40 −5 −50 −6 −60 0 500 1000 1500 f – Frequency – kHz Figure 50. DSD Filter-3, Low BW GAIN vs FREQUENCY 0 0 Figure 51. DSD Filter-3, High BW GAIN vs FREQUENCY fc = 94 kHz Gain(1) = –3.3 dB −1 −10 −2 Gain – dB Gain – dB 0 50 100 f – Frequency – kHz 150 200 −20 −3 −30 −4 −40 −5 −50 −6 −60 0 500 1000 1500 f – Frequency – kHz Figure 52. DSD Filter-4, Low BW Figure 53. DSD Filter-4, High BW (1) This gain is in comparison to PCM 0 dB, when the DSD input signal efficiency is 50%. All specifications at DBCK = 2.8224 MHz (44.1 kHz × 64 fS), and 50% modulation DSD data input, unless otherwise noted. 44 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 DSD MODE CONFIGURATION AND FUNCTION CONTROLS Configuration for the DSD Interface Mode DSD = 1 (Register 20, B5) B15 Register 16 Register 17 Register 18 Register 19 Register 20 Register 21 Register 22 R/W R/W R/W R/W R/W R R B14 0 0 0 0 0 0 0 B13 0 0 0 0 0 0 0 B12 1 1 1 1 1 1 1 B11 0 0 0 0 0 0 0 B10 0 0 0 0 1 1 1 B9 0 0 1 1 0 0 1 B8 0 1 0 1 0 1 0 B7 – – – REV – – – B6 – – – – SRST – – B5 – – – – 1 – – B4 – – – OPE – – – B3 – – DMF1 – MONO – – B2 – – DMF0 – CHSL DZ1 – B1 – – – – OS1 DZ0 ZFGR B0 – – – – OS0 – ZFGL NOTE: –: Function is disabled. No operation even if data bit is set DMF[1:0]: Analog FIR Performance Selection Default value: 00 DMF[1:0] 00 01 10 11 Analog-FIR Performance Select FIR-1 (default) FIR-2 FIR-3 FIR-4 Plots for the four analog FIR filter responses are shown in the TYPICAL PERFORMANCE CURVES section of this data sheet. OS[1:0]: Analog-FIR Operation-Speed Selection Default value: 00 OS[1:0] 00 01 10 11 Operation Speed Select fDBCK (default) fDBCK /2 Reserved fDBCK/4 The OS bit in the DSD mode is used to select the operating rate of the analog FIR. The OS bits must be set before setting the DSD bit to1. TDMCA Format The PCM1792A supports the time-division-multiplexed command and audio (TDMCA) data format to simplify the host control serial interface. The TDMCA format is designed not only for the McBSP of TI DSPs but also for any programmable devices. The TDMCA format can transfer not only audio data but also command data, so that it can be used together with any kind of device that supports the TDMCA format. The TDMCA frame consists of command field, extended command field, and some audio data fields. Those audio data are transported to IN devices (such as a DAC) and/or from OUT devices (such as an ADC). The PCM1792A is an IN device. LRCK and BCK are used with both IN and OUT devices so that the sample frequency of all devices in a system must be the same. The TDMCA mode supports a maximum of 30 device IDs. The maximum number of audio channels depends on the BCK frequency. 45 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 TDMCA Mode Determination The PCM1792A recognizes the TDMCA mode automatically when it receives an LRCK signal with a pulse duration of two BCK clocks. If the TDMCA mode operation is not needed, the duty cycle of LRCK must be 50%. Figure 54 shows the LRCK and BCK timing that determines the TDMCA mode. The PCM1792A enters the TDMCA mode after two continuous TDMCA frames. Any TDMCA commands can be issued during the next TDMCA frame after the TDMCA mode is entered. Pre-TDMCA Frame LRCK TDMCA Frame Command Accept 2 BCK BCK Figure 54. LRCK and BCK Timing of Determination TDMCA Mode TDMCA Terminals TDMCA requires six signals, of which four signals are for command and audio data interface, and one pair is for daisy chaining. Those signals can be shared as in the following table. The DO signal has a 3-state output so that it can be connected directly to other devices. TERMINAL NAME LRCK BCK DATA MDO MC MS TDMCA NAME LRCK BCK DI DO DCI DCO PROPERTY input input input output input output DESCRIPTION TDMCA frame start signal. It must be the same as the sampling frequency. TDMCA clock. Its frequency must be high enough to communicate a TDMCA frame within an LRCK cycle. TDMCA command and audio data input signal TDMCA command data 3-state output signal TDMCA daisy-chain input signal TDMCA daisy-chain output signal Device ID Determination The TDMCA mode also supports a multichip implementation in one system. This means a host controller (DSP) can simultaneously support several TDMCA devices, which can be of the same type or different types, including PCM devices. The PCM devices are categorized as IN device, OUT device, IN/OUT device, and NO device. The IN device has an input port to get audio data, the OUT device has an output port to supply audio data, the IN/OUT device has both input and output ports for audio data, and the NO device has no port for audio data but needs command data from the host. A DAC is an IN device, an ADC is an OUT device, a CODEC is an IN/OUT device, and a PLL is a NO device. The PCM1792A is an IN device. For the host controller to distinguish the devices, each device is assigned its own device ID by the daisy chain. The devices obtain their own device IDs automatically by connecting their DCI to the DCO of the preceding device and their DCO to the DCI of the following device in the daisy chain. The daisy chains are categorized as the IN chain and the OUT chain, which are completely independent and equivalent. Figure 55 shows an example daisy chain connection. If a system needs to chain the PCM1792A and a NO device in the same IN or OUT chain, the NO device should be chained at the back end of the chain because it does not require any audio data. Figure 56 shows an example of TDMCA system including an IN chain and an OUT chain with a TI DSP. For a device to get its own device ID, the DID signal must be set to 1 (see the Command Field section for details), and LRCK and BCK must be driven in the TDMCA mode for all PCM devices which are chained. The device at the top of the chain knows its device ID is 1 because its DCI is fixed HIGH. Other devices count the BCK pulses and observe their own DCI signal to determine their position and ID. Figure 57 shows the initialization of each device ID. 46 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 IN Chain DCI DCI DCI DCOi DCOi DCO DCO DCO DCI ••• IN Device IN Device IN IN/OUT Device IN ••• NO Device NO Device ••• DCOo IN/OUT Device OUT DCOo DCIo NO Device DCO DCI NO Device DCO 47 DCI OUT Device DCO DCI OUT Device DCO DCI DCIo ••• OUT ••• OUT Chain Figure 55. Daisy-Chain Connection DCO DCIi DCIi PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 DCII LRCK BCK DI DCIO DO DCOO Device ID = 1 IN/OUT DCOI Device (DIX1700) LRCK BCK DI DO IN Device (PCM1792A) DCI DCO Device ID = 2 LRCK BCK DI DO NO Device DCI DCO Device ID = 3 • • • FSX FSR CLKX CLKR DX DR TI DSP LRCK BCK DI DO DCO Device ID = 3 OUT Device DCI LRCK BCK DI DO DCO Device ID = 2 OUT Device DCI • • • Figure 56. IN Daisy-Chain and OUT Daisy-Chain Connection for a Multichip System 48 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 LRCK BCK DI DID Command Field Device ID = 1 Device ID = 2 DCO1 DCO1 DCI2 DCO2 DCI3 • • • • • • Device ID = 30 DCO29 DCI30 Device ID = 3 58 BCK Figure 57. Device ID Determination Sequence TDMCA Frame In general, the TDMCA frame consists of the command field, extended command (EMD) field, and audio data fields. All of them are 32 bits in length, but the lowest byte has no meaning. The MSB is transferred first for each field. The command field is always transferred as the first packet of the frame. The EMD field is transferred if the EMD flag of the command field is HIGH. If any EMD packets are transferred, no audio data follows the EMD packets. This frame is for quick system initialization. All devices of a daisy chain should respond to the command field and extended command field. The PCM1792A has two audio channels that can be selected by OPE (register 19). If this OPE bit is not set to HIGH, those audio channels are transferred. Figure 58 shows the general TDMCA frame. If some DACs are enabled, but corresponding audio data packets are not transferred, the analog outputs are unpredictable. 1/fS LRCK BCK [For Initialization] DI CMD 32 Bits DO [For Operation] DI CMD Ch1 Ch2 Ch3 Ch4 Ch(n) Don’t Care EMD EMD EMD EMD EMD Don’t Care CMD CMD CMD CMD CMD CMD CMD CMD DO CMD Ch1 Ch2 Ch3 Ch4 Ch(m) Figure 58. General TDMCA Frame 49 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 1/fS (256 PBCK Clocks) 7 Packets × 32 Bits LRCK BCK DI CMD Ch1 Ch2 Ch3 Ch4 Ch5 Ch6 Don’t Care CMD IN and OUT Channel Orders are Completely Independent DO CMD Ch1 Ch2 Figure 59. TDMCA Frame Example of 6-Ch DAC and 2-Ch ADC With Command Read Command Field The normal command field is defined as follows. When the DID bit (MSB) is 1, this frame is used only for device ID determination, and all remaining bits in the field are ignored. 31 command DID 30 EMD 29 DCS 28 24 23 R/W 22 register ID 16 15 data 8 7 not used 0 device ID Bit 31: Device ID enable flag The PCM1792A operates to get its own device ID for TDMCA initialization if this bit is HIGH. Bit 30: Extended command enable flag The EMD packet will be transferred if this bit is HIGH, otherwise skipped. Once this bit is HIGH, this frame does not contain any audio data. This is for system initialization. Bit 29: Daisy-chain selection flag HIGH designates OUT-chain devices, LOW designates IN-chain devices. The PCM1792A is an IN device, so the DCS bit must be set to LOW. Bits[28:24]: Device ID. It is 5 bits length, and it can be defined. These bits identify the order of a device in the IN or OUT daisy chain. The top of the daisy chain defines device ID 1 and successive devices are numbered 2, 3, 4, etc. All devices for which the DCI is fixed HIGH are also defined as ID 1. The maximum device ID is 30 each in the IN and OUT chains. If a device ID of 0x1F is used, all devices are selected as broadcast when in the write mode. If a device ID of 0x00 is used, no device is selected. Bit 23: Command Read/Write flag If this bit is HIGH, the command is a read operation. Bits[22:16]: Register ID It is 7 bits in length. Bits[15:8]: Command data It is 8 bits in length. Any valid data can be chosen for each register. Bits[7:0]: Not used These bits are never transported when a read operation is performed. Extended command field The extended command field is the same as the command field, except that it does not have a DID flag. 31 extended command rsvd 30 EMD 29 DCS 28 24 23 R/W 22 register ID 16 15 data 8 7 not used 0 device ID 50 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 Audio Fields The audio field is 32 bits in length and the audio data is transferred MSB first, so the other fields must be stuffed with 0s as shown in the following example. 31 audio data MSB 16 24 bits 12 8 LSB 7 43 All 0s 0 TDMCA Register Requirements TDMCA mode requires device ID and audio channel information, previously described. The OPE bit in register 19 indicates audio channel availability and register 23 indicates the device ID. Register 23 is used only in the TDMCA mode. See the mode control register map (Table 4). Register Write/Read Operation The command supports register write and read operations. If the command requests to read one register, the read data is transferred on DO during the data phase of the timing cycle. The DI signal can be retrieved at the positive edge of BCK, and the DO signal is driven at the negative edge of BCK. DO is activated one BCK cycle early to compensate for the output delay caused by high impedance. Figure 60 shows the TDMCA write and read timing. Register ID Phase Data Phase BCK DI Read Mode and Proper Register ID Write Data Retrieved, if Write Mode DO Read Data Driven, if Read Mode 1 BCK Early DOEN (Internal) Figure 60. TDMCA Write and Read Operation Timing TDMCA-Mode Operation DCO specifies the owner of the next audio channel in TDMCA-mode operation. When a device retrieves its own audio channel data, DCO goes HIGH during the last audio channel period. Figure 61 shows the DCO output timing in TDMCA-mode operation. The host controller ignores the behavior of DCI and DCO. DCO indicates the last audio channel of each device. Therefore, DCI means the next audio channel is allocated. If some devices are skipped due to no active audio channel, the skipped devices must notify the next device that the DCO will be passed through the next DCI. Figure 62 and Figure 63 show DCO timing with skip operation. Figure 64 shows the ac timing of the daisy-chain signals. 51 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 1/fS (384 PBCK Clocks) 9 Packets y 32 Bits LRCK BCK IN Daisy Chain DI DCI1 DID = 1 DID = 2 DID = 3 DID = 4 DCO1 DCI2 DCO2 DCI3 DCO3 DCI4 DCO4 CMD Ch1 Ch2 Ch3 Ch4 Ch5 Ch6 Ch7 Ch8 Don’t Care CMD Figure 61. DCO Output Timing of TDMCA Mode Operation 1/fS (256 PBCK Clocks) 5 Packets × 32 Bits LRCK BCK DI CMD Ch1 Ch2 Ch15 Ch16 Don’t Care CMD DCI DID = 1 DCO DCI DID = 2 • • • • • • DID = 8 DCO DCO • • • DCI 14 PBCK Delay 2 PBCK Delay Figure 62. DCO Output Timing With Skip Operation 52 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 Command Packet LRCK BCK DID EMD DI DCO1 DCO2 • • • Figure 63. DCO Output Timing With Skip Operation (for Command Packet 1) 53 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 LRCK t(LB) BCK t(BL) t(BCY) DI t(DS) t(DH) t(DOE) DO t(DS) DCI t(DH) t(COE) DCO PARAMETER t(BCY) BCK pulse cycle time t(LB) LRCK setup time t(BL) t(DS) t(DH) t(DS) LRCK hold time DI setup time DI hold time DCI setup time MIN 20 0 3 0 3 0 3 8 6 MAX UNITS ns ns ns ns ns ns ns ns ns t(DH) DCI hold time t(DOE) DO output delay(1) t(COE) DCO output delay(1) (1) Load capacitance is 10 pF. Figure 64. AC Timing of Daisy-Chain Signals 54 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 THEORY OF OPERATION Upper 6 Bits ICOB Decoder 0–62 Level 0–66 Advanced DWA 0–4 Level Current Segment DAC Analog Output Digital Input 24 Bits 8 fS MSB and Lower 18 Bits 3rd-Order 5-Level Sigma-Delta Figure 65. Advanced Segments DAC The PCM1792A uses TI’s advanced segment DAC architecture to achieve excellent dynamic performance and improved tolerance to clock jitter. The PCM1792A provides balanced current outputs. Digital input data via the digital filter is separated into six upper bits and 18 lower bits. The six upper bits are converted to inverted complementary offset binary (ICOB) code. The lower 18 bits, associated with the MSB, are processed by a five-level third-order delta-sigma modulator operated at 64 fS by default. The 1 level of the modulator is equivalent to the 1 LSB of the ICOB code converter. The data groups processed in the ICOB converter and third-order delta-sigma modulator are summed together to an up to 66-level digital code, and then processed by data-weighted averaging (DWA) to reduce the noise produced by element mismatch. The data of up to 66 levels from the DWA is converted to an analog output in the differential-current segment section. This architecture has overcome the various drawbacks of conventional multibit processing and also achieves excellent dynamic performance. 55 PCM1792A www.ti.com SLES105B − FEBRUARY 2004 − REVISED NOVEMBER 2006 Analog output The following table and Figure 66 show the relationship between the digital input code and analog output. 800000 (–FS) IOUTN [mA] IOUTP [mA] VOUTN [V] VOUTP [V] –2.3 –10.1 –1.725 –7.575 000000 (BPZ) –6.2 –6.2 –4.650 –4.650 7FFFFF (+FS) –10.1 –2.3 –7.575 –1.725 VOUT [V] –2.821 0 2.821 NOTE: VOUTN is the output of U1, VOUTP is the output of U2, and VOUT is the output of U3 in the measurement circuit of Figure 36. OUTPUT CURRENT vs INPUT CODE 0 −2 IO – Output Current – mA IOUTN −4 −6 −8 IOUTP −10 −12 800000(–FS) 000000(BPZ) Input Code – Hex 7FFFFF(+FS) Figure 66. The Relationship Between Digital Input and Analog Output 56 PACKAGE OPTION ADDENDUM www.ti.com 7-May-2007 PACKAGING INFORMATION Orderable Device PCM1792ADB PCM1792ADBG4 PCM1792ADBR PCM1792ADBRG4 (1) Status (1) ACTIVE ACTIVE ACTIVE ACTIVE Package Type SSOP SSOP SSOP SSOP Package Drawing DB DB DB DB Pins Package Eco Plan (2) Qty 28 28 28 28 47 47 Green (RoHS & no Sb/Br) Green (RoHS & no Sb/Br) Lead/Ball Finish CU NIPDAU CU NIPDAU CU NIPDAU CU NIPDAU MSL Peak Temp (3) Level-1-260C-UNLIM Level-1-260C-UNLIM Level-1-260C-UNLIM Level-1-260C-UNLIM 2000 Green (RoHS & no Sb/Br) 2000 Green (RoHS & no Sb/Br) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. 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Addendum-Page 1 MECHANICAL DATA MSSO002E – JANUARY 1995 – REVISED DECEMBER 2001 DB (R-PDSO-G**) 28 PINS SHOWN 0,65 28 0,38 0,22 15 0,15 M PLASTIC SMALL-OUTLINE 0,25 0,09 5,60 5,00 8,20 7,40 Gage Plane 1 A 14 0°– 8° 0,25 0,95 0,55 Seating Plane 2,00 MAX 0,05 MIN 0,10 PINS ** DIM A MAX 14 16 20 24 28 30 38 6,50 6,50 7,50 8,50 10,50 10,50 12,90 A MIN 5,90 5,90 6,90 7,90 9,90 9,90 12,30 4040065 /E 12/01 NOTES: A. B. C. D. All linear dimensions are in millimeters. This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion not to exceed 0,15. Falls within JEDEC MO-150 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. 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