PCM2912PJTR

          PCM2912 SLES216 – FEBRUARY 2008 AUDIO CODEC WITH USB INTERFACE, MONO MICROPHONE INPUT AND STEREO HEADPHONE OUTPUT FEATURES 1 • On-Chip USB Interface: – With Full-Speed Transceivers – Fully Compliant with USB 2.0 Specification – Certified By USB-IF – Partially Programmable Descriptors – Adaptive Isochronous Transfer for Playback – Asynchronous Isochronous Transfer for Record – Bus Powered • 16-Bit Delta-Sigma ADC and DAC • Sampling Rate: – 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz • On-Chip Clock Generator: – With Single 6-MHz Clock Source • Mono ADC with Microphone Input – Analog Performance at VBUS = 5 V: – THD+N: 0.01% – SNR: 92 dB – Dynamic Range: 90 dB – Decimation Digital Filter – Pass-Band Ripple: ±0.05 dB – Stop-Band Attenuation: –65 dB – Single-Ended Voltage Input – Antialiasing Filter Included – Digital HPF Included – Microphone Bias, Microphone Amplifier, and Input PGA • Stereo DAC With Headphone Output – Analog Performance at VBUS = 5.0 V: – THD+N: 0.01% (RL > 10 kΩ) – THD+N: 0.02% (RL = 32 Ω) – SNR: 92 dB – Dynamic Range: 90 dB – PO: 13 mW (RL = 32 Ω) – PO: 25 mW (RL = 16 Ω) 23 • • • • – Oversampling Digital Filter – Pass-Band Ripple: ±0.1 dB – Stop-Band Attenuation: –43 dB – Single-Ended Voltage Output – Analog LPF Included – Sidetone PGA, Output PGA, and HP Amplifier Multifunctions: – Suspend, Playback, and Record Status Flag – Microphone Amplifier, Mute, and Gain Control Pop/Click Noise Free Single Power Supply: 5 V Typ (VBUS) Package: 32-Pin TQFP APPLICATIONS • • • • • • • USB Headset USB Headphone USB Speaker USB Featured Consumer Audio Product USB Audio Interface Box USB Monitor Video Conference System DESCRIPTION The PCM2912 is the Texas Instruments single-chip, USB stereo audio CODEC with USB 2.0-compliant full-speed protocol controller and analog front end (AFE) function for headset application. The USB protocol controller works with no software code, but USB descriptors can be modified on request (1). The PCM2912 employs SpAct™ architecture, TI’s unique system that recovers the audio clock from USB packet data. On chip analog PLLs with SpAct enables independent playback and record sampling rate with low clock jitters. (1) The descriptor can be modified by changing a mask; contact your representative about the details. 1 2 3 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. SpAct is a trademark of Texas Instruments. Audio Precision, System Two are trademarks of Audio Precision, Inc.. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2008, Texas Instruments Incorporated PCM2912 www.ti.com SLES216 – FEBRUARY 2008 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. ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) (1) Supply voltage (2) VBUS Ground voltage differences: BGND, PGND, AGND, HGND, DGND Input voltage : VCCP, VCCA, VCCL, VCCR, VDD UNIT –0.3 to +6.5 V ±0.1 V –0.3 to 4 V –0.3 to 6.5 V D+, D–, XTI, XTO, MMUTE, TEST0, TEST1, POWER, MAMP, SSPND –0.3 to 4 V MBIAS, VIN, VCOM1, VCOM2, VOUTL, VOUTR, FR, FL –0.3 to 4 V ±10 mA Ambient temperature under bias –40 to 125 °C Storage temperature –55 to 150 °C Junction temperature 150 °C Digital input voltage Analog input voltage PLAY, REC. PCM2912 Input current (any pins except supplies) (1) (2) 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. All voltage values are with respect to network ground terminal. RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) MIN VBUS Supply voltage 4.35 Analog input voltage, full scale (–0 dB) 5.00 5.25 UNIT V Vp-p TTL Digital iInput clock frequency 5.997 Analog output load resistance 2 MAX 0.43 VCCA Digital input logic family TA NOM 6.000 6.003 MHz Ω 32 Analog output load capacitance 100 pF Digital output load capacitance 10 pF 70 °C Operating free-air temperature –25 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 ELECTRICAL CHARACTERISTICS All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted PARAMETER TEST CONDITIONS PCM2912PJT MIN TYP MAX UNIT DIGITAL INPUT/OUTPUT Host interface Apply USB Revision 2.0, full-speed Audio data format USB isochronous data format INPUT LOGIC VIH IIH (1) (2) IIL 2 Input logic level VIL (1) (2) IIH (3) Input logic current IIL (3) 3.3 0.8 VIN = 3.3 V ±10 VIN = 0 V ±10 VIN = 3.3 V 65 VIN = 0 V 100 ±10 VDC µA µA OUTPUT LOGIC VOH (1) IOH = –10 mA VOL (1) IOL = 10 mA VOH (4) Output logic level IOH = –2 mA 2.9 0.3 2.8 VDC (4) IOL = 2 mA VOL (5) IOL = 8 mA 0.5 VIN = 5 V ±10 VOL IOH (5) Output leak current 0.5 µA CLOCK FREQUENCY Input clock frequency, XTI 5.997 6.000 6.003 MHz MICROPHONE BIAS Output voltage 0.75 VCCA Output current Output noise (1) (2) (3) (4) (5) RL = 1 kΩ VDC 2 mA 5 µVrms Pins 3, 4: D–, D+. Pins 8, 23, 24, 27, 28: XTI, MAMP, POWER, TEST1, TEST0 Pin 30: MMUTE Pins 7, 29: XTO, SSPND Pins 31, 32: REC, PLAY. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 3 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 ELECTRICAL CHARACTERISTICS (continued) All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted PARAMETER TEST CONDITIONS PCM2912PJT MIN TYP MAX UNIT ADC CHARACTERISTICS Resolution Audio data channel 16 Bits 1 channel 8, 11.025, 16, 22.05, 32, 44.1, 48 Sampling frequency kHz DYNAMIC PERFORMANCE (6) THD+N VIN = –1 dB of 0.43 VCCA Dynamic range A-weighted 82 0.01% 90 0.02% dB S/N ratio A-weighted 84 92 dB DC ACCURACY Gain error ±2 ±10 % of FSR Bipolar zero error ±0 % of FSR ANALOG INPUT Input voltage Center voltage Antialiasing filter frequency response –3 dB fIN = 20 kHz 0.43 VCCA Vp-p 0.5 VCCA V 150 kHz –0.08 dB MICROPHONE AMPLIFIER Gain 0 Input impedance 20 20 dB kΩ INPUT PGA Gain range –12 Gain step size 30 1 dB dB DIGITAL FILTER PERFORMANCE Pass band 0.454 fS Stop band 0.583 fS Hz Pass-band ripple ±0.02 Stop-band attenuation –65 Delay time HPF frequency response (6) 4 –3 dB Hz dB dB 17.4/fS s 0.078 fS MHz fIN = 1 kHz, using Audio Precision™ System Two™, RMS mode with 20 kHz LPF, 400 Hz HPF in calculation. Mic amp = 0 dB, PGA = 0 dB. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 ELECTRICAL CHARACTERISTICS (continued) All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted PARAMETER TEST CONDITIONS PCM2912PJT MIN TYP UNIT MAX DAC CHARACTERISTICS Resolution Audio data channel 16 Bits 1, 2 channel 8, 11.025, 16, 22.05, 32, 44.1, 48 Sampling frequency kHz DYNAMIC PERFORMANCE (7) THD+N RL > 10 kΩ, VOUT = 0 dB of 0.6 VCCA 0.01% 0.02% RL = 32 Ω, VOUT = 0 dB of 0.55 VCCA 0.02% 0.05% Dynamic range EIAJ, A-Weighted 82 90 dB S/N ratio EIAJ, A-Weighted 84 92 dB Channel separation RL > 10 kΩ 80 88 dB DC ACCURACY Gain mismatch channel-to-channel ±2 ±10 % of FSR Gain error ±2 ±10 % of FSR Bipolar zero error ±3 % of FSR ANALOG OUTPUT Output voltage RL > 10 kΩ 0.6 VCCA RL = 32 Ω 0.55 VCCA Center voltage Vp-p 0.5 VCCA Output power Load impedance (AC coupling) LPF frequency response RL = 32 Ω 13 RL = 16 Ω 25 LINE 10 HEADPHONE 16 V mW kΩ 32 Ω –3 dB 140 kHz f = 20 kHz –0.1 dB SIDETONE PROGRAMMABLE ATTENUATOR Gain range –76 Gain step size 0 1 dB dB OUTPUT PROGRAMMABLE ATTENUATOR Gain range –76 Gain step size ANALOG LOOPBACK PERFORMANCE (8) dB dB (8) THD+N (7) 0 1 RL > 10 kΩ, VIN = 0 dB of 0.43 VCCA 0.01% 0.02% RL = 32 Ω, VIN = 0 dB of 0.43 VCCA 0.02% 0.05% Dynamic range EIAJ, A-weighted 82 90 dB S/N ratio EIAJ, A-weighted 84 92 dB fOUT = 1 kHz, using Audio Precision ™System Two ™, RMS mode with 20 kHz LPF, 400 Hz HPF. Output attenuator = 0 dB, Sidetone = Mute. MIC Amp = 0 dB, Sidetone attenuator = 0 dB, Output attenuator = 0 dB. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 5 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 ELECTRICAL CHARACTERISTICS (continued) All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted PARAMETER TEST CONDITIONS PCM2912PJT MIN TYP MAX UNIT DIGITAL FILTER PERFORMANCE Pass band 0.445 fS Stop band 0.555 fS Hz Pass-band ripple ±0.1 Stop-band attenuation –43 Delay time Hz dB dB 14.3/fS s POWER SUPPLY REQUIREMENTS VBUS Voltage range Supply current Power dissipation VCCP,VCCL, VCCR,VCCA, VDD Bus-powered 4.35 ADC, DAC operation (RL = 32 Ω) 5.0 5.25 VDC mA 85 100 Suspend mode (9) 220 300 µA ADC, DAC Operation 425 500 mW Suspend mode(9) 0.8 1 mW 3.3 3.6 VDC Internally generated power supply voltage (10) 3 TEMPERATURE RANGE Operation temperature θJA Thermal resistance –25 32-pin TQFP 85 80 °C °C/W (9) Under USB suspend state (10) Pins 5, 15, 19, 21, 26: VDD, VCCA, VCCL, VCCR, VCCP. 6 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 DEVICE INFORMATION PIN ASSIGNMENTS POWER MAMP VOUTR VCCR HGND VCCL VOUTL MBIAS PCM2912 (TOP VIEW) 24 23 22 21 20 19 18 17 PGND 25 16 VIN VCCP 26 15 VCCA TEST1 27 14 NC TEST0 28 13 AGND SSPND 29 12 VCOM2 MMUTE 30 11 VCOM1 REC 31 10 FR PLAY 32 9 FL 1 2 3 4 5 6 7 8 BGND VBUS D- D+ VDD DGND XTO XTI PCM2912PJT (32-pin TQFP) Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 7 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 TERMINAL FUNCTIONS TERMINAL I/O DESCRIPTIONS NAME PJT BGND 1 – Reference for internal regulator. VBUS 2 – Connect to USB power (VBUS) D– 3 I/O USB differential input/output minus (1) D+ 4 I/O USB differential input/output plus (1) VDD 5 – DGND 6 XTO 7 O Crystal oscillator output XTI 8 I Crystal oscillator input FL 9 – External filter pin of L-channel (optional) FR 10 – External filter pin of R-channel (optional) VCOM1 11 – Common voltage for ADC, DAC and analog front end (VCCA/2). Decouple capacitor should be connected to AGND. VCOM2 12 – Common voltage for headphone (VCCA/2). Decouple capacitor should be connected to AGND. AGND 13 – Analog ground NC 14 – Not connected VCCA 15 – Analog power supply VIN 16 I ADC microphone input MBIAS 17 O Microphone bias output (0.75 VCCA) VOUTL 18 O Headphone output for L-channel VCCL 19 – Analog power supply for headphone amplifier of L-channel (2) HGND 20 – Analog ground for headphone amplifier VCCR 21 – Analog power supply for headphone amplifier of R-channel (2) VOUTR 22 O Headphone output for R-channel MAMP 23 I Microphone preamplifier gain control (LOW: Preamplifier off, HIGH: Preamplifier on = +20 dB) (3) POWER 24 I Power consumption declaration select pin (LOW: 100 mA, HIGH: 500 mA) PGND 25 – Analog ground for microphone bias, microphone amplifier, and PGA VCCP 26 – Analog power supply for PLL (2) TEST1 27 I Test pin. Must be set to HIGH (3) TEST0 28 I Test pin. Must be set to LOW SSPND 29 O Suspend flag (LOW: Suspend, HIGH: Operational state) MMUTE 30 I Microphone mute control, active HIGH (LOW: Mute off, HIGH: Mute on) (4) REC 31 O Status output for record (LOW: Record, FLASH: Mute on recode, HIGH: Stop) (5) PLAY 32 O Status output for playback (LOW: Playback, FLASH: Mute on playback, HIGH: Stop) (5) (1) (2) (3) (4) (5) 8 Digital power supply (2) Digital ground (3) (3) (3) LV-TTL level Connect decouple capacitor to corresponding ground. 3.3-V CMOS level input. 3.3-V CMOS level input with internal pulldown. 5 V tolerant, open-drain. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 FUNCTIONAL BLOCK DIAGRAM BGND VCCA/VCCP/VCCL/VCCR/VDD Vref. 5 V to 3.3 V Voltage Regulator AGND/ HGND/ PGND/DGND Power Manager SSPND VBUS MIC BIAS MBIAS VIN MIC AMP PGA + 30 dB ~ –12 dB in 1 dB steps FIFO XCVR D+ D– ADC +20/0 dB Selector USB SIE Analog PLL VCOM2 VCOM1 VOUTL S MMUTE PLAY FIFO S HP AMP 15 mW (@32 W) ATT 0 dB ~ –76 dB in 1 dB steps with Mute ISO- Out Endpoint USB Protocol Controller FR PLL (x16) POWER MAMP Selector DAC VOUTR Control Endpoint Analog PLL ATT 0 dB ~ –76 dB in 1 dB steps with Mute FL ISO- In Endpoint 96 MHz REC. TEST 0 TEST 1 Tracker (SpAct® ) 6.000 MHz XTI XTO Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 9 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 TYPICAL PERFORMANCE CURVES OF INTERNAL FILTER All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted. ADC Digital Decimation Filter Frequency Response OVERALL CHARACTERISTIC STOP-BAND ATTENUATION 0 0 -20 Amplitude - dB Amplitude - dB -40 -80 -40 -60 -120 -80 -100 0 -160 0 8 16 24 Normalized Frequency - x fS 32 0.8 1 TRANSIENT-BAND RESPONSE 0.2 0 0 -4 Amplitude - dB Amplitude - dB 0.6 Figure 2. PASS-BAND RIPPLE -0.2 -0.4 -8 -12 -16 -0.6 0 0.1 0.2 0.3 0.4 Normalized Frequency - x fS 0.5 -20 0.46 Figure 3. 10 0.4 Normalized Frequency - x fS Figure 1. -0.8 0.2 0.48 0.50 0.52 Normalized Frequency - x fS 0.54 Figure 4. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 TYPICAL PERFORMANCE CURVES OF INTERNAL FILTER (continued) All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted. ADC Digital High-Pass Filter Frequency Response PASS-BAND CHARACTERISTIC 0 -20 -0.2 Amplitude - dB Amplitude - dB STOP-BAND CHARACTERISTIC 0 -40 -60 -0.4 -0.6 -0.8 -80 -1 0 -100 0 0.1 0.2 0.3 Normalized Frequency - x fS/1000 0.4 1 2 3 Normalized Frequency - x fS/1000 Figure 5. 4 Figure 6. ADC Analog Antialiasing Filter Frequency Response PASS-BAND CHARACTERISTIC 0 -10 -0.2 Amplitude - dB Amplitude - dB STOP-BAND CHARACTERISTIC 0 -20 -30 -0.4 -0.6 -0.8 -40 -50 1 10 100 1000 f - Frequency - kHz 10000 -1 0.01 Figure 7. 0.1 1 10 f - Frequency - kHz 100 Figure 8. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 11 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 TYPICAL PERFORMANCE CURVES OF INTERNAL FILTER (continued) All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted. DAC Digital Interpolation Filter Frequency Response PASS-BAND RIPPLE 0.2 -20 0 Amplitude - dB Amplitude - dB STOP-BAND ATTENUATION 0 -40 -60 -80 -0.2 -0.4 -0.6 -100 0 1 2 3 Normalized Frequency - x fS 4 -0.8 0 0.1 0.2 0.3 0.4 Normalized Frequency - x fS Figure 9. 0.5 Figure 10. TRANSIENT-BAND RESPONSE 0 Amplitude - dB -4 -8 -12 -16 -20 0.46 0.48 0.50 0.52 Normalized Frequency - x fS 0.54 Figure 11. 12 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 TYPICAL PERFORMANCE CURVES OF INTERNAL FILTER (continued) All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted. DAC Analog FIR Filter Frequency Response PASS-BAND CHARACTERISTIC 0.2 -10 0 Amplitude - dB Amplitude - dB STOP-BAND CHARACTERISTIC 0 -20 -30 -40 -50 0 -0.2 -0.4 -0.6 -0.8 8 16 24 Normalized Frequency - x fS 32 0 0.1 0.2 0.3 0.4 Normalized Frequency - x fS Figure 12. 0.5 Figure 13. DAC Analog Low-Pass Filter Frequency Response PASS-BAND CHARACTERISTIC 0 -10 -0.2 Amplitude - dB Amplitude - dB STOP-BAND CHARACTERISTIC 0 -20 -30 -40 -0.4 -0.6 -0.8 -50 1 10 100 1000 f - Frequency - kHz 10000 -1 0.01 Figure 14. 0.1 1 10 100 f - Frequency - kHz Figure 15. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 13 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 TYPICAL PERFORMANCE CURVES All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted. ADC DYNAMIC RANGE and SNR vs TEMPERATURE THD+N at -1 dB vs TEMPERATURE 96 0.009 Dynamic Range and SNR - dB THD+N - Total Harmonic Distortion + Noise - % 0.01 0.008 0.007 0.006 0.005 94 SNR 92 DYNAMIC RANGE 90 88 0.004 0.003 -50 -25 0 25 50 75 TA - Free-Air Temperature - °C 86 -50 100 -25 0 25 50 75 TA - Free-Air Temperature - °C Figure 16. Figure 17. DYNAMIC RANGE and SNR vs SUPPLY VOLTAGE THD+N at -1 dB vs SUPPLY VOLTAGE 98 0.009 96 Dynamic Range and SNR - dB THD+N - Total Harmonic Distortion + Noise - % 0.01 0.008 0.007 0.006 0.005 94 SNR 92 DYNAMIC RANGE 90 88 0.004 0.003 4.2 4.4 4.6 4.8 5 VBUS - Supply Voltage - V 5.2 5.4 86 4.2 4.4 4.6 4.8 5 5.2 5.4 VBUS - Supply Voltage - V Figure 18. 14 100 Figure 19. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 TYPICAL PERFORMANCE CURVES (continued) All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted. THD+N at -1 dB vs SAMPLING FREQUENCY DYNAMIC RANGE and SNR vs SAMPLING FREQUENCY 98 0.009 96 Dynamic Range and SNR - dB THD+N - Total Harmonic Distortion + Noise - % 0.01 0.008 0.007 0.006 0.005 94 SNR 92 90 DYNAMIC RANGE 88 0.004 0.003 30 35 40 45 fS - Sampling Frequency - kHz 86 30 50 35 40 45 fS - Sampling Frequency - kHz Figure 20. 50 Figure 21. DAC DYNAMIC RANGE and SNR vs TEMPERATURE THD+N at 0 dB vs TEMPERATURE 96 0.009 Dynamic Range and SNR - dB THD+N - Total Harmonic Distortion + Noise - % 0.01 0.008 0.007 0.006 0.005 SNR 92 DYNAMIC RANGE 90 88 0.004 0.003 -50 94 -25 0 25 50 75 TA - Free-Air Temperature - °C 100 86 -50 -25 0 25 50 75 100 TA - Free-Air Temperature - °C Figure 22. Figure 23. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 15 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 TYPICAL PERFORMANCE CURVES (continued) All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted. DYNAMIC RANGE and SNR vs SUPPLY VOLTAGE THD+N at 0 dB vs SUPPLY VOLTAGE 98 0.009 96 Dynamic Range and SNR - dB THD+N - Total Harmonic Distortion + Noise - % 0.01 0.008 0.007 0.006 0.005 SNR 92 DYNAMIC RANGE 90 88 0.004 0.003 4.2 94 4.4 4.6 4.8 5 5.2 86 4.2 5.4 VBUS - Supply Voltage - V Figure 24. 0.009 5.4 96 Dynamic Range and SNR - dB THD+N - Total Harmonic Distortion + Noise - % 5.2 DYNAMIC RANGE and SNR vs SAMPLING FREQUENCY 98 THD+N at 0 dB vs SAMPLING FREQUENCY 0.008 0.007 0.006 0.005 0.004 94 SNR 92 DYNAMIC RANGE 90 88 35 40 45 fS - Sampling Frequency - kHz 50 86 30 Figure 26. 16 4.6 4.8 5 VBUS - Supply Voltage - V Figure 25. 0.01 0.003 30 4.4 35 40 45 fS - Sampling Frequency - kHz 50 Figure 27. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 TYPICAL PERFORMANCE CURVES (continued) All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted. Supply Current SUPPLY CURRENT vs SUPPLY VOLTAGE SUPPLY CURRENT vs SAMPLING FREQUENCY 90 0.4 90 Operational current 80 0.3 Suspend Current 70 0.2 60 0.1 50 4.2 0.0 4.45 4.7 4.95 VBUS - Supply Voltage - V 5.2 Operational Current - mA 100 Suspend Current - mA 0.5 Operational Current - mA 100 80 70 60 50 30 35 40 45 fS - Sampling Frequency - kHz Figure 28. 50 Figure 29. SUPPLY CURRENT vs TEMPERATURE at SUSPEND MODE 0.40 Suspend Current - mA 0.35 USB spec limit for device = 0.3 mA 0.30 0.25 0.20 0.15 0.10 -40 -20 0 20 40 60 80 TA - Free-Air Temperature - °C 100 Figure 30. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 17 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 USB INTERFACE Control data and audio data are transferred to the PCM2912 via D+ (pin 4) and D– (pin 3). All data to/from the PCM2912 are performed in full-speed. The following information is described in the device descriptor. The device descriptor can be modified on request. Table 1. Device Descriptor USB revision 2.0 compliant Device class 0x00 (device defined interface level) Device sub class 0x00 (not specified) Device protocol 0x00 (not specified) Max packet size for endpoint 0 8 byte Vendor ID 0x08BB Product ID 0x2910 Device release number 0x0100 (1.00) Number of configurations 1 Vendor string String #1 (refer to Table 3) Product string String #2 (refer to Table 3) Serial number Not supported The following information is described in the configuration descriptor. The configuration descriptor can be modified on request. Table 2. Configuration Descriptor Interface 3 interfaces Power attribute 0x80 (Bus powered, no remote wakeup) Max power 0x32 (100 mA at POWER=Low) / 0xFA (500mA at POWER = High) The following information is described in the string descriptor. The string descriptor can be modified on request. Table 3. String Descriptor 18 #0 0x0409 #1 Burr-Brown from TI #2 USB audio CODEC Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 Device Configuration Figure 31 illustrates USB audio function topology. The PCM2912 has three interfaces. Each interface is constructed by some alternative settings. Endpoint #0 Default endpoint FU Endpoint #1 (IF #1) IT TID3 S OT TID6 UID4 Analog out Audio streaming interface UID5 FU IT TID1 UID2 Analog in FU Endpoint #2 (IF #2) OT S TIDB UIDA IT TID7 Audio streaming interface UID8 Standard Audio Control interface (IF #0) Figure 31. USB Audio Function Topology Interface #0 Interface #0 is for control interface. Alternative setting #0 is the only possible setting for interface #0. Alternative setting #0 describes the standard audio control interface. Audio control interface is constructed by a terminal. The PCM2912 has ten terminals as follows. • Input Terminal (Terminal ID#1) for audio analog input for sidetone • Feature Unit (Unit ID#2) for sidetone PGA • Input Terminal (Terminal ID#3) for isochronous-out stream • Mixer Unit (Unit ID#4) for sidetone mixing • Feature Unit (Unit ID#5) for analog output PGA • Output Terminal (Terminal ID#6) for audio analog output • Input Terminal (Terminal ID#7) for audio analog input • Feature Unit (Unit ID#8) for analog input PGA • Mixer Unit (Unit ID#A) for analog input • Output Terminal (Terminal ID#B) for isochronous-in stream Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 19 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 The Input Terminal #3 is defined as USB stream (terminal type 0x0101). The Input Terminal #3 can accept 2-channel audio streams constructed by Left and Right channels. The Output Terminal #6 is defined as a speaker (terminal type 0x0301). The Input Terminals #1 and #7 are defined as Microphone (terminal type 0x0201). Physically, these two input terminals are the same input, but logically duplicated. The Output Terminal #B is defined as a USB stream (terminal type 0x0101). The Output Terminal #B is a single-channel audio stream. The Mixer Unit #4 mixes up the analog input (sidetone) and the audio data of the DAC. The Mixer Unit #A is placed in front of the Output Terminal #B. The Mixer Unit #A has no impact on record data. The Mixer Units #4 and #A do not have programming capability. The Feature Unit #5 supports the following sound control features for analog outputs. • Volume control • Mute control The built-in volume controller can be manipulated by an audio-class-specific request from 0 dB to –76 dB in steps of 1 dB. An individual (L and R) channel can be set for different values. The built-in mute controller can be manipulated by an audio-class-specific request. Only a master mute control request is acceptable. The Feature Unit #2 supports the following sound control features for analog input (sidetone). • Volume control • Mute control The built-in volume controller can be manipulated by an audio-class-specific request from 0 dB to –76 dB in 1-dB steps. The only master volume control is acceptable. The built-in mute controller can be manipulated by audio-class-specific request. The only master mute control request is acceptable. The Feature Unit #8 supports the following sound control features for analog input (microphone record input). • Volume control • Mute control The built-in analog volume controller can be manipulated by an audio-class-specific request from +30 dB to –12 dB in 1-dB steps. The built-in mute controller can be manipulated by an audio-class-specific request. The only master mute control request is acceptable. Interface #1 Interface #1 is for audio streaming data-out interface. Interface #1 has the following three alternative settings. Alternative setting #0 is the zero bandwidth setting. All other alternative settings are operational settings. ALTERNATIVE SETTING DATA FORMAT 00 TRANSFER MODE SAMPLING RATE (kHz) Zero band width 01 16 bit Stereo 2s complement (PCM) Adaptive 8, 11.025, 16, 22.05, 32, 44.1, 48 02 16 bit Mono 2s complement (PCM) Adaptive 8, 11.025, 16, 22.05, 32, 44.1, 48 Interface #2 Interface #2 is for audio streaming data in interface. Interface #2 has the following two alternative settings. Alternative setting #0 is the Zero Band Width setting. Alternative setting #1 is an operational setting. ALTERNATIVE SETTING DATA FORMAT 00 01 20 TRANSFER MODE SAMPLING RATE (kHz) Zero band width 16 bit Mono 2s complement (PCM) Submit Documentation Feedback Asynchronous 8, 11.025, 16, 22.05, 32, 44.1, 48 Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 Endpoints The PCM2912 has three endpoints as follows. • Control endpoint (EP #0) • Isochronous-out audio data stream endpoint (EP #1) • Isochronous-in audio data stream endpoint (EP #2) The control endpoint is a default endpoint. The control endpoint is used to control all functions of the PCM2912 by the standard USB request and USB audio-class-specific request from the host. Isochronous-out audio data stream endpoint is an audio sink endpoint, which receives the PCM audio data. The isochronous-out audio data stream endpoint accepts the adaptive transfer mode. Isochronous-in audio data stream endpoint is an audio source endpoint, which transmits the PCM audio data. The isochronous-in audio data stream endpoint uses synchronous transfer mode. Internal Regulator All required power sources are generated by five internal regulators. Each regulator generates 3.3 V (typical, without load) from VBUS (pin 2). Each regulator has an output pin and ground return pin as follows, and this pair must be decoupled with an appropriate capacitor. Note that this capacitance affects inrush-current limitation. One band-gap reference circuit supplies reference voltage for all regulators. BGND (pin 1) is provided for reference ground of the band-gap reference. SUPPLIED CIRCUIT OUTPUT RETURN Digital VDD (pin 5) DGND (pin 6) Analog VCCA (pin 15) AGND (pin 13) Headphone (L-ch) VCCL (pin 19) HGND (pin 20) Headphone (R-ch) VCCR (pin 21) HGND (pin 20) PLL VCCP (pin 26) PGND (pin 25) Clock and Reset The PCM2912 requires a 6-MHz (±500 ppm) clock for USB function and audio function, which can be generated by a built-in crystal oscillator with a 6-MHz crystal resonator. The 6-MHz crystal resonator must be connected to XTI (pin 8) and XTO (pin 7) with one high (1-MΩ) resistor and two small capacitors, whose capacitance depends on the load capacitance of the crystal resonator. An external clock can be supplied from XTI; if an external clock is supplied, XTO must be left open. Because there is no clock disabling signal, using the external clock supply is not recommended. SSPND (pin 29) is unable to use clock disabling. The PCM2912 has an internal power-on-reset circuit, which works automatically when VBUS (pin 2) exceeds 2.5 V, typical (2.2 V–2.7 V), and approximately 700 µs is required until the internal reset is released. DAC The PCM2912 has the stereo delta-sigma DAC which uses a 64-fS oversampling technique with 8-fS oversampling digital filter. DAC outputs are provided through the headphone amplifier, VOUTL (pin 18), and VOUTR (pin 22) can provides 13 mW at 32 Ω and 0.6 VCCL/VCCR Vp-p at 10-kΩ load. ADC The PCM2912 has the mono delta-sigma ADC which uses a 64-fS oversampling technique with 1/64-fS decimation digital filter. Microphone input, VIN (pin 16), is fed to ADC through +20-dB microphone amplifier and PGA which has +30 dB to –12 dB in 1-dB steps. Microphone Bias The PCM2912 has the microphone bias generator, which provides low-noise, 0.75-VCCA, 2-mA source current output with appropriate output impedance for electret-microphone driving. This output, MBIAS (pin 17) should be bypassed to AGND (pin 13) through an appropriate capacitor for reducing output noise level. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 21 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 Microphone Amplifier The PCM2912 has the low-noise, single-ended mono microphone amplifier with mute function which is controlled by MUTE (pin 30). The signal gain is selectable by MAMP (pin 23). The noise level at input node is 5 µVrms, and the input impedance is 20 kΩ. Input PGA The PCM2912 has the low-noise input programmable gain amplifier (PGA) for the microphone amplifier output/ADC input, whose gain range is +30 dB to –12 dB in 1dB/step. Sidetone Programmable Attenuator The PCM2912 has the low-noise, sidetone programmable attenuator with mute function for the sidetone signal path (microphone amplifier output to output PGA input), whose gain range is 0 dB to –76 dB in 1 dB/step. Output Programmable Attenuator The PCM2912 has the low-noise output programmable attenuator with mute function for mixed signal, which affects DAC output signal and sidetone signal. The output PGA gain range is 0 dB to –76 dB in 1 dB/step. VCOM1 and VCCM2 VCOM2 (pin 12) is provided for the center voltage of a headphone amplifier. VCOM1 (pin 11) is provided for the center voltage of all other analog circuit. Each VCOM pin must be decoupled with an appropriate capacitor. Because the headphone output is disconnected when entering the suspend state, determining the capacitance is important to prevent the pop-noise, especially for the VCOM2 (pin 12). The equivalent resistance of VCOM2 is 500 kΩ, and VCOM1 is 15 kΩ. Filter Pins FL (pin 9) and FR (pin 10) are provided to make an LPF to decrease the DAC outband noise. This is optional. Side Tone 20 kW 20 kW 10 kW 10 kW DAC – + VCOM FR/FL Cf Figure 32. Filter Circuit 22 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 INTERFACE SEQUENCE Power-On, Attach, and Play Back Sequence The PCM2912 is ready for setup when the reset sequence has finished and the USB bus is attached. After a connection has been established by setup, the PCM2912 is ready to accept USB audio data. While awaiting the audio data (idle state), the analog output is set to bipolar zero (BPZ). When receiving the audio data, the PCM2912 stores the first audio packet, which contained 1-ms audio data, into the internal storage buffer. The PCM2912 starts playing the audio data when detecting the following Start of Frame (SOF) packet. 5.0 V (typ.) VBUS(pin 2) 2.5 V (typ.) 0V Bus reset D+(pin 4), Set configuration 1st audio data 2nd audio data Bus Idle D–(pin 3) SOF SOF SOF SSPND(pin 29) BPZ VOUT L (pin 18), VOUT R (pin 22) 700 µs Device setup 1 ms Internal reset Ready for setup Ready for playback Figure 33. Initial Sequence Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 23 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 Play Stop and Detach Sequence When the host finishes or aborts the playing back, the PCM2912 stops the playing after last audio data has played. VBUS (pin 2) Audio data Audio data Last audio data D+ (pin 4), D–(pin 3) SOF SOF SOF SOF SOF VOUT L (pin 18), VOUT R (pin 22) 1ms Detach Figure 34. Play, Stop, and Detach Record Sequence The PCM2912 starts the audio capture into the internal memory after receiving the SET_INTERFACE command. SET_INTERFACE IN token Audio data IN token Audio data IN token Audio data D+ (pin 4), D– (pin 3) SOF SOF SOF SOF SOF VIN (pin 16) 1ms Figure 35. Record Sequence 24 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 Suspend and Resume Sequence The PCM2912 enters the suspend state after it sees a constant Idle state on the USB bus after approximately 5 ms. When the PCM2912 enters the suspend state, SSPND flag (pin 29) is asserted. The PCM2912 wakes up immediately when detecting the non-idle state on the USB bus. Idle D+(pin 4), D–(pin 3) SSPND (pin 29) 5 ms Suspend VOUT L (pin 18), VOUT R (pin 22) Active 2.5 ms Active Figure 36. Suspend and Resume Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): PCM2912 25 PCM2912 www.ti.com SLES216 – FEBRUARY 2008 TYPICAL CIRCUIT CONNECTION A bus-powered (Hi-power), +20-dB microphone amplifier application example follows. Headphone R11 Microphone R8 R5 C13 C16 C10 R7 R10 R6 R9 C15 C12 VOUTR 20 19 18 17 MBIAS VCCL MAMP 25 21 VOUTL PGND C17 22 V IN 16 HGND 23 VCCR POWER 24 C9 C11 C14 V CCA 15 26 VCCP 27 TEST1 28 TEST0 29 AGND 13 PCM2912 SSPND XTI 3 4 5 6 7 8 C18 REC. PLAY C1 R1 C5 XTO 2 1 C6 FR 10 DGND BGND C7 V COM 1 11 D+ PLAY V COM 2 12 VDD R1 3 32 D- R1 2 31 REC VBUS 30 MMUTE Mic Mute C8 N.C. 14 R2 FL 9 C4 R4 X1 R3 C2 C3 L1 V BUS D – D+ GND USB Connector NOTE: X1: 6-MHz crystal resonator C1, C8, C11, C14, C17, C18: 1 µF ceramic C2, C3: 10 pF to 33 pF (depending on load capacitance of crystal resonator) C4, C5: 100 pF ceramic C6, C10: 3.3 µF C7: 0.1 µF C9: 0.22 µF electrolytic (depending on required frequency response for microphone input) C12, C15: 0.022 µF ceramic C13, C16: 100 µF electrolytic (depending on required frequency response for headphone output) R1, R2: 22 Ω to 33 Ω R3: 1.5 kΩ R4: 1 MΩ R5: 1 kΩ (depending on microphone characteristic) R6, R9: 16 Ω R7, R8, R10, R11: 3.3 kΩ R12, R13: 820 Ω (depending on LED drive current) L1: 1 µH (DC resistance