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PCM2906C

www.ti.com

SBFS037 –NOVEMBER 2011

Stereo Audio Codec

with USB Interface, Single-Ended Analog Input/Output, and S/PDIF

Check for Samples: PCM2906C

FEATURES

• Stereo DAC:

– Analog Performance at V

BUS

= 5 V:

234

• On-Chip USB Interface:

– THD+N = 0.005%

– With Full-Speed Transceivers

– SNR = 96 dB

– Fully Compliant with USB 2.0 Specification

– Dynamic Range = 93 dB

– Certified by USB-IF

– Oversampling Digital Filter:

– USB Adaptive Mode for Playback

– Passband Ripple = ±0.1 dB

– USB Asynchronous Mode for Record

– Stop-Band Attenuation = –43 dB

– Bus Powered

– Single-Ended Voltage Output

• 16-Bit Delta-Sigma ADC and DAC

– Analog LPF Included

• Sampling Rate:

• Multifunctions:

– DAC: 32, 44.1, 48 kHz

– Human Interface Device (HID) Function:

– ADC: 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz

– Volume and Mute Controls

• On-Chip Clock Generator with Single 12-MHz

Clock Source

– Suspend Flag Function

• S/PDIF Input/Output

• 28-Pin SSOP Package

• Single Power Supply:

APPLICATIONS

– 5 V Typical (V

BUS

)

• USB Audio Speaker

• Stereo ADC:

• USB Headset

– Analog Performance at V

BUS

= 5 V:

• USB Monitor

– THD+N = 0.01%

• USB Audio Interface Box

– SNR = 89 dB

– Dynamic Range = 89 dB

DESCRIPTION

– Decimation Digital Filter:

The PCM2906C is Texas Instruments' single-chip,

– Passband Ripple = ±0.05 dB

USB, stereo audio codec with a USB-compliant

full-speed protocol controller and S/PDIF. The USB

– Stop-Band Attenuation = –65 dB

protocol controller requires no software code. The

– Single-Ended Voltage Input

PCM2906C employs SpAct™ architecture, TI's

– Antialiasing Filter Included

unique system that recovers the audio clock from

– Digital HPF Included

USB packet data. On-chip analog PLLs with SpAct

enable playback and record with low clock jitter, as

well as independent playback and record sampling

rates.

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.

2SpAct is a trademark of Texas Instruments.

3System Two, Audio Precision are trademarks of Audio Precision, Inc.

4All other trademarks are the property of their respective owners.

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.

Summary of content (28 pages)

PAGE 1
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com Stereo Audio Codec with USB Interface, Single-Ended Analog Input/Output, and S/PDIF Check for Samples: PCM2906C FEATURES 1 • On-Chip USB Interface: – With Full-Speed Transceivers – Fully Compliant with USB 2.0 Specification – Certified by USB-IF – USB Adaptive Mode for Playback – USB Asynchronous Mode for Record – Bus Powered • 16-Bit Delta-Sigma ADC and DAC • Sampling Rate: – DAC: 32, 44.1, 48 kHz – ADC: 8, 11.025, 16, 22.05, 32, 44.
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PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com 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.
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PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com ELECTRICAL CHARACTERISTICS All specifications at TA = +25°C, VBUS, = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data (unless otherwise noted). PCM2906C PARAMETER TEST CONDITIONS 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 (1) 2 3.3 VIL (1) 0.8 VIH (2) (3) VIL (2) (3) VIH (4) 2.52 3.3 2 5.25 2.52 5.25 0.
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PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) All specifications at TA = +25°C, VBUS, = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data (unless otherwise noted). PCM2906C PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ADC CHARACTERISTICS Resolution Audio data channel 8, 16 Bits 1, 2 Channel ADC Clock Frequency fs Sampling frequency 8, 11.025, 16, 22.05, 32, 44.
PAGE 5
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) All specifications at TA = +25°C, VBUS, = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data (unless otherwise noted). PCM2906C PARAMETER TEST CONDITIONS MIN TYP MAX UNIT DAC CHARACTERISTICS Resolution Audio data channel 8, 16 Bits 1, 2 Channel DAC Clock Frequency fs Sampling frequency 32, 44.
PAGE 6
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com PIN ASSIGNMENTS DB PACKAGE SSOP-28 (TOP VIEW) D+ D– VBUS DGNDU HID0 HID1 HID2 SEL0 SEL1 VCCCI AGNDC VINL VINR VCOM 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 SSPND VDDI DGND DOUT DIN VCCXI AGNDX XTI XTO VCCP2I AGNDP VCCP1I VOUTL VOUTR P0007-05 Table 1. TERMINAL FUNCTIONS (1) (2) (3) (4) (5) (6) 6 NAME NO.
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PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com FUNCTIONAL BLOCK DIAGRAM VCCCI VCCP1I VCCP2I VCCXI VDDI AGNDC AGNDP AGNDX DGND DGNDU 5-V to 3.
PAGE 8
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com BLOCK DIAGRAM OF ANALOG FRONT-END (RIGHT CHANNEL) 4.
PAGE 9
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com TYPICAL CHARACTERISTICS: ADC All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, using REG103xA-A, unless otherwise noted. TOTAL HARMONIC DISTORTION + NOISE AT –1 dB vs FREE-AIR TEMPERATURE DYNAMIC RANGE and SNR vs FREE-AIR TEMPERATURE 95 0.009 Dynamic Range and SNR – dB THD+N – Total Harmonic Distortion + Noise – % 0.010 0.008 0.007 0.006 0.005 91 Dynamic Range 89 SNR 87 0.004 0.
PAGE 10
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com TYPICAL CHARACTERISTICS: ADC (continued) All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, using REG103xA-A, unless otherwise noted. TOTAL HARMONIC DISTORTION + NOISE AT –1 dB vs SAMPLING FREQUENCY DYNAMIC RANGE and SNR vs SAMPLING FREQUENCY 95 0.009 Dynamic Range and SNR – dB THD+N – Total Harmonic Distortion + Noise – % 0.010 0.008 0.007 0.006 0.005 93 91 Dynamic Range 89 SNR 87 0.004 0.
PAGE 11
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com TYPICAL CHARACTERISTICS: DAC (continued) All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, using REG103xA-A, unless otherwise noted. TOTAL HARMONIC DISTORTION + NOISE AT 0 dB vs SUPPLY VOLTAGE DYNAMIC RANGE and SNR vs SUPPLY VOLTAGE 98 97 0.007 Dynamic Range and SNR – dB THD+N – Total Harmonic Distortion + Noise – % 0.008 0.006 0.005 0.004 95 Dynamic Range 94 93 92 91 0.003 4.0 4.5 5.0 90 4.0 5.
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PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com TYPICAL CHARACTERISTICS: SUPPLY CURRENT All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, using REG103xA-A, unless otherwise noted. OPERATIONAL and SUSPEND SUPPLY CURRENT vs SUPPLY VOLTAGE ICC – Operational Supply Current – mA 60 0.28 Operational 0.26 50 Suspend 40 0.24 30 0.22 20 4.00 4.25 4.50 4.75 5.00 5.25 ICC – Suspend Supply Current – mA 0.30 70 0.20 5.50 VBUS – Supply Voltage – V G013 Figure 13.
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PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com TYPICAL CHARACTERISTICS: ADC DIGITAL DECIMATION FILTER FREQUENCY RESPONSE All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted. OVERALL CHARACTERISTICS STOP-BAND ATTENUATION 0 0 −10 −20 −20 −40 Amplitude – dB Amplitude – dB −30 −60 −80 −100 −40 −50 −60 −70 −120 −80 −140 −90 −100 0.0 −160 0 8 16 24 32 Frequency [y fS] 0.2 G016 Figure 16. PASSBAND RIPPLE 0.8 1.
PAGE 14
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com TYPICAL CHARACTERISTICS: ADC DIGITAL HIGH-PASS FILTER FREQUENCY RESPONSE All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted. STOP-BAND CHARACTERISTICS PASSBAND CHARACTERISTICS 0 0.0 −10 −20 −0.2 Amplitude – dB Amplitude – dB −30 −40 −50 −60 −0.4 −0.6 −70 −80 −0.8 −90 −100 0.0 −1.0 0.1 0.2 0.3 Frequency [y fS/1000] 0.4 0 1 2 3 Frequency [y fS/1000] G020 Figure 20.
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PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com TYPICAL CHARACTERISTICS: DAC DIGITAL INTERPOLATION FILTER FREQUENCY RESPONSE All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted. STOP-BAND ATTENUATION PASSBAND RIPPLE 0 0.2 −10 −20 0.0 Amplitude – dB Amplitude – dB −30 −40 −50 −60 −0.2 −0.4 −70 −80 −0.6 −90 −100 0 1 2 3 −0.8 0.0 4 Frequency [y fS] 0.1 0.2 0.3 0.4 Frequency [y fS] G024 Figure 24. 0.5 G025 Figure 25.
PAGE 16
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com TYPICAL CHARACTERISTICS: DAC ANALOG FIR FILTER FREQUENCY RESPONSE All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted. PASSBAND CHARACTERISTICS 0.2 −10 0.0 Amplitude – dB Amplitude – dB STOP-BAND CHARACTERISTICS 0 −20 −30 −40 −0.2 −0.4 −0.6 −50 0 8 16 24 Frequency [y fS] −0.8 0.0 32 0.1 0.2 0.3 0.4 Frequency [y fS] G027 Figure 27. 0.5 G028 Figure 28.
PAGE 17
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com DETAILED DESCRIPTION USB INTERFACE Control data and audio data are transferred to the PCM2906C via D+ (pin 1) and D– (pin 2). All data to/from the PCM2906C are transferred at full speed. The device descriptor contains the information described in Table 2. Table 2. Device Descriptor USB revision 2.
PAGE 18
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com DEVICE CONFIGURATION Figure 31 illustrates the USB audio function topology. The PCM2906C has four interfaces. Each interface consists of alternative settings. End-Point #0 Default End-Point FU End-Point #2 (IF #1) Analog Out IT TID1 OT TID2 Audio Streaming Interface UID3 End-Point #4 (IF #2) Analog In IT TID4 OT TID5 Audio Streaming Interface Standard Audio Control Interface (IF #0) End-Point #5 (IF #3) HID Interface Device M0024-02 Figure 31.
PAGE 19
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com Interface #0 Interface #0 is the control interface. Alternative setting #0 is the only possible setting for interface #0. Alternative setting #0 describes the standard audio control interface. The audio control interface consists of a single terminal.
PAGE 20
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com Interface #2 Interface #2 is the audio streaming data-in interface. Interface #2 has the 19 alternative settings listed in Table 6. Alternative setting #0 is the zero-bandwidth setting. All other alternative settings are operational settings. Table 6.
PAGE 21
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com Clock and Reset The PCM2906C requires a 12-MHz (±500 ppm) clock for the USB and audio functions. The clock can be generated by a built-in oscillator with a 12-MHz crystal resonator. The 12-MHz crystal resonator must be connected to XTI (pin 21) and XTO (pin 20) with one high-value (1-MΩ) resistor and two small capacitors, the capacitance of which depends on the load capacitance of the crystal resonator. An external clock can be supplied to XTI (pin 21).
PAGE 22
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com INTERFACE SEQUENCE Power-On, Attach, and Playback Sequence The PCM2906C is ready for setup when the reset sequence has finished and the USB device is attached. After a connection has been established by setup, the PCM2906C is ready to accept USB audio data. While waiting for the audio data (idle state), the analog output is set to bipolar zero (BPZ).
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PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com Record Sequence The PCM2906C starts audio capture into the internal memory after receiving the SET_INTERFACE command, as shown in Figure 34. Audio Data SET_INTERFACE IN Token Audio Data IN Token Audio Data IN Token D+/D– SOF SOF SOF SOF SOF VINL VINR 1 ms T0259-01 Figure 34. Record Sequence Suspend and Resume Sequence The PCM2906C enters the suspend state after a constant idle state on the USB bus (approximately 5 ms), as shown in Figure 35.
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PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com APPLICATION INFORMATION TYPICAL CIRCUIT CONNECTION 1 Figure 36 illustrates a typical circuit connection for a simple application. The circuit illustrated is for information only. The entire board design should be considered to meet the USB specification as a USB-compliant product. 1.5 kW ´ 3 1.
PAGE 25
PCM2906C SBFS037 – NOVEMBER 2011 www.ti.com TYPICAL CIRCUIT CONNECTION 2 Figure 37 illustrates a typical circuit connection for a simple application. The circuit illustrated is for information only. The entire board design should be considered to meet the USB specification as a USB-compliant product. 1.
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PACKAGE OPTION ADDENDUM www.ti.
PAGE 27
MECHANICAL DATA MSSO002E – JANUARY 1995 – REVISED DECEMBER 2001 DB (R-PDSO-G**) PLASTIC SMALL-OUTLINE 28 PINS SHOWN 0,38 0,22 0,65 28 0,15 M 15 0,25 0,09 8,20 7,40 5,60 5,00 Gage Plane 1 14 0,25 A 0°–ā8° 0,95 0,55 Seating Plane 2,00 MAX 0,10 0,05 MIN PINS ** 14 16 20 24 28 30 38 A MAX 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 DIM 4040065 /E 12/01 NOTES: A. B. C. D. All linear dimensions are in millimeters.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.