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  • PCM2912A Audio Codec With USB Interface, Mono Microphone Input and Stereo Headphone Output

    • SLES230A September   2008  – August 2015 PCM2912A

      PRODUCTION DATA.  

  • CONTENTS
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  • PCM2912A Audio Codec With USB Interface, Mono Microphone Input and Stereo Headphone Output
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
      1. 7.6.1 ADC Digital Decimation Filter Frequency Response
      2. 7.6.2 ADC Digital High-Pass Filter Frequency Response
      3. 7.6.3 ADC Analog Antialiasing Filter Frequency Response
      4. 7.6.4 DAC Digital Interpolation Filter Frequency Response
      5. 7.6.5 DAC Analog FIR Filter Frequency Response
      6. 7.6.6 DAC Analog Low-Pass Filter Frequency Response
      7. 7.6.7 ADC
      8. 7.6.8 DAC
      9. 7.6.9 Supply Current
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Clock and Reset
      2. 9.3.2  DAC
      3. 9.3.3  ADC
      4. 9.3.4  Microphone Bias
      5. 9.3.5  Microphone Amplifier
      6. 9.3.6  Input PGA
      7. 9.3.7  Sidetone Programmable Attenuator
      8. 9.3.8  Output Programmable Attenuator
      9. 9.3.9  VCOM1 and VCCM2
      10. 9.3.10 Filter Pins
      11. 9.3.11 Interface Sequence
        1. 9.3.11.1 Power-On, Attach, and Play Back Sequence
        2. 9.3.11.2 Play, Stop, and Detach Sequence
        3. 9.3.11.3 Record Sequence
        4. 9.3.11.4 Suspend and Resume Sequence
    4. 9.4 Device Functional Modes
    5. 9.5 Programming
      1. 9.5.1 USB Interface
        1. 9.5.1.1 Device Configuration
        2. 9.5.1.2 Interface #0
        3. 9.5.1.3 Interface #1
        4. 9.5.1.4 Interface #2
        5. 9.5.1.5 Endpoints
        6. 9.5.1.6 Internal Regulator
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Community Resources
    3. 13.3 Trademarks
    4. 13.4 Electrostatic Discharge Caution
    5. 13.5 Glossary
  14. 14Mechanical, Packaging, and Orderable Information
  15. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • PJT|32
    • MPQF112A
Thermal pad, mechanical data (Package|Pins)
Orderable Information
  • sles230a_oa
  • sles230a_pm
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DATA SHEET

PCM2912A Audio Codec With USB Interface, Mono Microphone Input and Stereo Headphone Output

1 Features

  • 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, or 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
      • Passband 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)
    • Oversampling Digital Filter
      • Passband 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 Typical (VBUS)
  • Package: 32-Pin TQFP

2 Applications

  • USB Headset
  • USB Headphone
  • USB Speaker
  • USB Featured Consumer Audio Product
  • USB Audio Interface Box
  • USB Monitor
  • Video Conference System

3 Description

The PCM2912A is the Texas Instruments single-chip, USB stereo audio codec with a USB, 2.0-compliant, full-speed protocol controller and an analog front-end (AFE) function for headset applications.

The USB protocol controller works with no software code, but USB descriptors can be modified on request. The PCM2912A 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 rates with low clock jitters.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
PCM2912A TQFP (32) 7.00 mm × 7.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Block Diagram

PCM2912A Block_Diagram.gif

4 Revision History

Changes from * Revision (September 2008) to A Revision

  • Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, Device Comparison table, and Mechanical, Packaging, and Orderable Information section Go

5 Device Comparison Table

FEATURE PCM2900C PCM2902C PCM2903C PCM2906C PCM2912A
Supply voltage 5 V (Bus-Powered) 5 V (Bus-Powered) 3.3 V (Bus-Powered) 5 V (Bus-Powered) 5 V (Bus-Powered)
Additional features — S/PDIF I/O S/PDIF I/O S/PDIF I/O
500-mA Maximum Power Configuration 		Mic Bias
PGAs
Sidetone

6 Pin Configuration and Functions

PJT Package
32-Pin TQFP
Top View
PCM2912A pinout_les230.gif

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
AGND 13 — Analog ground
BGND 1 — Reference for internal regulator
D– 3 I/O USB differential input/output minus(1)
D+ 4 I/O USB differential input/output plus(1)
DGND 6 Digital ground
FL 9 — External filter pin of L-channel (optional)
FR 10 — External filter pin of R-channel (optional)
HGND 20 — Analog ground for headphone amplifier
MAMP 23 I Microphone preamplifier gain control (LOW: Preamplifier off, HIGH: Preamplifier on = +20 dB)(2)
MBIAS 17 O Microphone bias output (0.75 VCCA)
MMUTE 30 I Microphone mute control, active HIGH (LOW: Mute off, HIGH: Mute on)(3)
NC 14 — Not connected
PGND 25 — Analog ground for microphone bias, microphone amplifier, and PGA
PLAY 32 O Status output for playback (LOW: Playback, FLASH: Mute on playback, HIGH: Stop)(5)
POWER 24 I Power consumption declaration select pin (LOW: 100 mA, HIGH: 500 mA) (2)
REC 31 O Status output for record (LOW: Record, FLASH: Mute on recode, HIGH: Stop)(5)
SSPND 29 O Suspend flag (LOW: Suspend, HIGH: Operational state)
TEST0 28 I Test pin. Must be set to LOW(2)
TEST1 27 I Test pin. Must be set to HIGH(2)
VBUS 2 — Connect to USB power (VBUS)
VCCA 15 — Analog power supply
VCCL 19 — Analog power supply for headphone amplifier of L-channel(4)
VCCP 26 — Analog power supply for PLL(4)
VCCR 21 — Analog power supply for headphone amplifier of R-channel(4)
VCOM1 11 — Common voltage for ADC, DAC, and analog front-end (VCCA/2). Decoupling capacitor must be connected to AGND.
VCOM2 12 — Common voltage for headphone (VCCA/2). Decoupling capacitor must be connected to AGND.
VDD 5 — Digital power supply(4)
VIN 16 I ADC microphone input
VOUTL 18 O Headphone output for L-channel
VOUTR 22 O Headphone output for R-channel
XTI 8 I Crystal oscillator input(2)
XTO 7 O Crystal oscillator output
(1) LV-TTL level
(2) 3.3-V CMOS level input.
(3) 3.3-V CMOS level input with internal pulldown resistor.
(4) Connect decoupling capacitor to corresponding ground.
(5) 5-V tolerant, open-drain.

7 Specifications

7.1 Absolute Maximum Ratings

Over operating free-air temperature range (unless otherwise noted).(1)(2)
MIN MAX UNIT
Supply voltage VBUS –0.3 6.5 V
Ground voltage differences BGND, PGND, AGND, HGND, DGND –0.1 0.1 V
Input voltage VCCP, VCCA, VCCL, VCCR, VDD –0.3 4 V
Digital input voltage PLAY, REC –0.3 6.5 V
D+, D–, XTI, XTO, MMUTE, TEST0, TEST1, POWER, MAMP, SSPND –0.3 4 V
Analog input voltage MBIAS, VIN, VCOM1, VCOM2, VOUTL, VOUTR, FR, FL –0.3 4 V
Input current (any pins except supplies) –10 10 mA
Ambient temperature under bias –40 125 °C
Junction temperature 150
Storage temperature, Tstg –55 150
(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) All voltage values are with respect to network ground terminal.

7.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±3000 V
Charged device model (CDM), per JEDEC specification JESD22-C101(2) ±1000
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.3 Recommended Operating Conditions

Over operating free-air temperature range (unless otherwise noted).
MIN NOM MAX UNIT
VBUS Supply voltage 4.35 5 5.25 V
Analog input voltage, full scale (–0 dB) 0.43 VCCA VPP
Digital input logic family TTL
Digital input clock frequency 5.997 6 6.003 MHz
Analog output load resistance 32 Ω
Analog output load capacitance 100 pF
Digital output load capacitance 10 pF
TA Operating free-air temperature –25 70 °C

7.4 Thermal Information

THERMAL METRIC(1) PCM2912A UNIT
PJT (TQFP)
32 PINS
RθJA Junction-to-ambient thermal resistance 69.6 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 10.6 °C/W
RθJB Junction-to-board thermal resistance 34.6 °C/W
ψJT Junction-to-top characterization parameter 0.3 °C/W
ψJB Junction-to-board characterization parameter 33.9 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

7.5 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. for Host interface, apply USB revision 2.0, full-speed. For audio data format, use UsB isochronous data format.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT LOGIC
VIH Input logic high level 2 3.3 VDC
VIL Input logic low level 0.8
IIH Input logic high current(1)(2) VIN = 3.3 V –10 10 μA
Input logic high current(3) VIN = 3.3 V 65 100
IIL Input logic low current(1)(2) VIN = 0 V –10 10 μA
Input logic low current(3) VIN = 0 V –10 10
OUTPUT LOGIC
VOH Output logic high level(1) IOH = –10 mA 2.9 VDC
Output logic high level(4) IOH = –2 mA 2.8
VOL Output logic low level(1) IOL = 10 mA 0.3 VDC
Output logic low level(4) IOL = 2 mA 0.5
Output logic low level(5) IOL = 8 mA 0.5
IOH Output leak current(5) VIN = 5 V ±10 μA
CLOCK FREQUENCY
Input clock frequency, XTI 5.997 6.000 6.003 MHz
MICROPHONE BIAS
Output voltage 0.75 VCCA VDC
Output current 2 mA
Output noise RL = 1 kΩ 5 μVRMS
ANALOG-TO-DIGITAL CONVERTER (ADC) CHARACTERISTICS
Resolution 16 Bits
Audio data channel 1 Channel
Sampling frequency 8
11.025
16
22.05
32
44.1
48		 kHz
ADC DYNAMIC PERFORMANCE(6)
THD+N Total harmonic distortion plus noise VIN = –1 dB of 0.43 VCCA 0.01% 0.02%
Dynamic range A-weighted 82 90 dB
SNR Signal-to-noise ratio A-weighted 84 92 dB
ADC DC ACCURACY
Gain error ±2 ±10 % of FSR
Bipolar zero error ±0 % of FSR
ANALOG INPUT
Input voltage 0.43 VCCA VPP
Center voltage 0.5 VCCA V
Antialiasing filter frequency response –3 dB 150 kHz
fIN = 20 kHz –0.08 dB
MICROPHONE AMPLIFIER
Gain 0 20 dB
Input impedance 20 kΩ
INPUT PGA
Gain range –12 30 dB
Gain step size 1 dB
ADC DIGITAL FILTER PERFORMANCE
Passband 0.454 fS Hz
Stop band 0.583 fS Hz
Passband ripple –0.02 0.02 dB
Stop-band attenuation –65 dB
Delay time 17.4/fS s
HPF frequency response –3 dB 0.078 fS/1000 Hz
DIGITAL-TO-ANALOG CONVERTER (DAC) CHARACTERISTICS
Resolution 16 Bits
Audio data channel 1, 2 Channel
Sampling frequency 8
11.025
16
22.05
32
44.1
48 		kHz
DAC DYNAMIC PERFORMANCE(7)
THD+N Total harmonic distortion plus noise 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
SNR Signal-to-noise ratio EIAJ, A-weighted 84 92 dB
Channel separation RL > 10 kΩ 80 88 dB
DAC DC ACCURACY
Gain mismatch channel-to-channel –10 ±2 10 % of FSR
Gain error –10 ±2 10 % of FSR
Bipolar zero error ±3 % of FSR
ANALOG OUTPUT
Output voltage RL > 10 kΩ 0.6 VCCA VPP
RL = 32 Ω 0.55 VCCA
Center voltage 0.5 VCCA V
Output power RL = 32 Ω 13 mW
RL = 16 Ω 25
Load impedance (AC coupling) Line 10 kΩ
Headphone 16 32 Ω
LPF frequency response –3 dB 140 kHz
f = 20 kHz –0.1 dB
SIDETONE PROGRAMMABLE ATTENUATOR
Gain range –76 0 dB
Gain step size 1 dB
OUTPUT PROGRAMMABLE ATTENUATOR
Gain range –76 0 dB
Gain step size 1 dB
ANALOG LOOPBACK PERFORMANCE(8)
THD+N Total harmonic distortion plus noise 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
SNR Signal-to-noise ratio EIAJ, A-weighted 84 92 dB
DAC DIGITAL FILTER PERFORMANCE
Passband 0.445 fS Hz
Stop band 0.555 fS Hz
Passband ripple ±0.1 dB
Stop-band attenuation –43 dB
Delay time 14.3/fS s
POWER-SUPPLY REQUIREMENTS
VBUS Voltage range Bus-powered 4.35 5 5.25 VDC
Supply current ADC, DAC operation (RL = 32 Ω) 85 100 mA
Suspend mode(9) 220 300 μA
Power dissipation ADC, DAC Operation 425 500 mW
Suspend mode(9) 0.8 1 mW
VCCP,VCCL VCCR,VCCA VDD Internally-generated power supply voltage(10) 3 3.3 3.6 VDC
TEMPERATURE RANGE
Operation temperature –25 85 °C
(1) Pins 3, 4: D–, D+.
(2) Pins 8, 23, 24, 27, 28: XTI, MAMP, POWER, TEST1, TEST0
(3) Pin 30: MMUTE
(4) Pins 7, 29: XTO, SSPND
(5) Pins 31, 32: REC, PLAY.
(6) fIN = 1 kHz, using Audio Precision™System Two™, RMS mode with 20-kHz LPF, 400-Hz HPF in calculation. Microphone amplifier = 0 dB, PGA = 0 dB.
(7) fOUT = 1 kHz, using Audio Precision System Two, RMS mode with 20-kHz LPF, 400-Hz HPF. Output attenuator = 0 dB,
Sidetone = Mute.
(8) MIC Amp = 0 dB, Sidetone attenuator = 0 dB, Output attenuator = 0 dB.
(9) Under USB suspend state
(10) Pins 5, 15, 19, 21, 26: VDD, VCCA, VCCL, VCCR, VCCP.

7.6 Typical Characteristics

7.6.1 ADC Digital Decimation Filter Frequency Response

All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
PCM2912A amp_f_les230.gifFigure 1. Overall Characteristic
PCM2912A bp_ripp_les230.gifFigure 3. Passband Ripple
PCM2912A stopb_atn_les230.gifFigure 2. Stop Band Attenuation
PCM2912A trn_res_les230.gifFigure 4. Transient Band Response

7.6.2 ADC Digital High-Pass Filter Frequency Response

All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
PCM2912A stopb_chr_les230.gifFigure 5. Stop Band Characteristic
PCM2912A passb_chr_les230.gifFigure 6. Passband Characteristic

7.6.3 ADC Analog Antialiasing Filter Frequency Response

All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
PCM2912A stopb_f_les230.gifFigure 7. Stop Band Characteristic
PCM2912A passb_f_les230.gifFigure 8. Passband Characteristic

7.6.4 DAC Digital Interpolation Filter Frequency Response

All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
PCM2912A sb_attn_les230.gifFigure 9. Stop Band Attenuation
PCM2912A trnsb_res_les230.gifFigure 11. Transient Band Response
PCM2912A bp2_ripp_les230.gifFigure 10. Passband Ripple

7.6.5 DAC Analog FIR Filter Frequency Response

All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
PCM2912A sb_chr_les230.gifFigure 12. Stop Band Characteristic
PCM2912A pb_chr_les230.gifFigure 13. Passband Characteristic

7.6.6 DAC Analog Low-Pass Filter Frequency Response

All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
PCM2912A sp_f_les230.gifFigure 14. Stop Band Characteristic
PCM2912A pb_f_chr_les230.gifFigure 15. Passband Characteristic

7.6.7 ADC

All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
PCM2912A thdn_ta_les230.gifFigure 16. THD+N at –1 dB vs Temperature
PCM2912A thdn_v_les230.gifFigure 18. THD+N at –1 dB vs Supply Voltage
PCM2912A thdn_fs_les230.gifFigure 20. THD+N at –1 dB vs Sampling Frequency
PCM2912A dr_ta_les230.gifFigure 17. Dynamic Range and Signal-to-Noise Ratio vs Temperature
PCM2912A dr_v_les230.gifFigure 19. Dynamic Range and Signal-to-Noise Ratio vs Supply Voltage
PCM2912A dr_fs_les230.gifFigure 21. Dynamic Range and Signal-to-Noise Ratio vs Sampling Frequency

7.6.8 DAC

All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
PCM2912A thdn2_ta_les230.gifFigure 22. THD+N at 0 dB vs Temperature
PCM2912A thdn2_v_les230.gifFigure 24. THD+N at 0 dB vs Supply Voltage
PCM2912A thdn2_fs_les230.gifFigure 26. THD+N at 0 dB vs Sampling Frequency
PCM2912A d2r_ta_les230.gifFigure 23. Dynamic Range and Signal-to-Noise Ratio vs Temperature
PCM2912A dr2_v_les230.gifFigure 25. Dynamic Range and Signal-to-Noise Ratio vs Supply Voltage
PCM2912A dr2_fs_les230.gifFigure 27. Dynamic Range and Signal-to-Noise Ratio vs Sampling Frequency

7.6.9 Supply Current

All specifications at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
PCM2912A sup_cur_sv_les230.gifFigure 28. Supply Current vs Supply Voltage
PCM2912A sc_ta_les230.gifFigure 30. Supply Current vs Temperature at Suspend Mode
PCM2912A sc_fs_les230.gifFigure 29. Supply Current vs Sampling Frequency

 
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