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Texas Instruments PCM2902EG4
- Part No.:
- PCM2902EG4
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2902EG4.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,836
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Product details
Overview
PCM2902EG4 from Texas Instruments is a stereo audio codec IC with integrated USB 1.1 full-speed interface, S/PDIF input/output, 16-bit delta-sigma ADC/DAC, and on-chip clock generator. It operates from a single 5-V bus supply, supports adaptive playback and asynchronous recording, and delivers 96 dB SNR (DAC) and 89 dB SNR (ADC) at 44.1 kHz - used in USB headsets, audio interface boxes, and monitor speakers.
For engineers reviewing the PCM2902EG4 datasheet, PCM2902EG4 pinout, PCM2902EG4 application, or PCM2902EG4 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed S/PDIF-enabled audio system roles, and two field-tested alternative parts with documented functional trade-offs.
Technical Context
The PCM2902EG4 implements TI's SpAct™ architecture to recover audio clocks directly from USB packet timing, eliminating external crystal oscillators for playback while supporting independent ADC/DAC sampling rates (ADC: 8–48 kHz; DAC: 32/44.1/48 kHz). Its analog front-end integrates antialiasing and low-pass filters, and digital decimation/interpolation filters with ±0.05 dB pass-band ripple and 65 dB stop-band attenuation.
It embeds a USB protocol controller compliant with USB Audio Class 1.0 and HID class, enabling plug-and-play operation without host driver modification. The S/PDIF transceiver (DIN/DOUT pins) operates at 3.3-V CMOS level with internal pulldown, and the device uses four USB interfaces: control, stereo playback, stereo record, and HID volume/mute - all managed via standard audio class descriptors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC SNR | 96 dB (A-weighted, EIAJ), enabling high-fidelity line-out with minimal noise floor in consumer audio systems |
| ADC THD+N | 0.01% (at –0.5 dBFS, VBUS = 5 V), ensuring clean microphone or line-in capture without audible distortion |
| Sampling Rates | DAC: 32/44.1/48 kHz (adaptive); ADC: 8/11.025/16/22.05/32/44.1/48 kHz (asynchronous), supporting CD, streaming, and voice-grade audio |
| S/PDIF Support | Integrated DIN (input) and DOUT (output) terminals, 3.3-V CMOS, 5-V tolerant - enables direct digital audio passthrough without external transceiver |
| Power Supply | Single 5-V USB bus supply (4.35–5.25 V), with internal 3.3-V regulation - eliminates need for external LDOs in bus-powered designs |
| Dynamic Range | DAC: 93 dB (EIAJ), ADC: 89 dB - meets CD-quality audio requirements for both playback and recording paths |
| USB Compliance | Fully USB-IF certified, USB 1.1 full-speed (12 Mbps), isochronous endpoints for zero-dropout audio streaming |
Pinout & Package
PCM2902EG4 is housed in a 28-pin SSOP (Package Designator: 28DB), surface-mount package with 0.65-mm lead pitch, rated for –25°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN (Pin 24) | S/PDIF digital audio input | 3.3-V CMOS-level receiver with internal pulldown; accepts coaxial or optical S/PDIF streams for digital audio ingestion |
| DOUT (Pin 25) | S/PDIF digital audio output | 3.3-V CMOS-level transmitter; drives standard S/PDIF receivers without level-shifting or buffering |
| VINL/VINR (Pins 12/13) | ADC analog inputs (L/R) | Single-ended, 0.6×VCCCI p-p full-scale range; include on-chip antialiasing filter and DC bias (VCOM) |
| VOUTL/VOUTR (Pins 16/15) | DAC analog outputs (L/R) | Single-ended, 0.6×VCCCI p-p, with integrated low-pass filter and 250-kHz bandwidth - suitable for direct connection to headphones or line drivers |
| XTI/XTO (Pins 21/20) | Crystal oscillator interface | Supports 12-MHz fundamental-mode crystal (±8 kHz tolerance); enables precise clock recovery for SpAct™ jitter reduction |
| HID0/HID1/HID2 (Pins 5/6/7) | HID control inputs | Active-high, 3.3-V CMOS with internal pulldown; report mute/volume-up/volume-down events to host OS without ADC/DAC involvement |
| SSPND (Pin 28) | USB suspend flag output | Active-low open-drain signal indicating USB suspend state - used to gate power to downstream analog circuitry |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ clock recovery | Eliminates need for separate audio PLL or master clock source; recovers low-jitter 44.1/48 kHz from USB packet timing |
| Integrated S/PDIF I/O | Reduces BOM count by two ICs (e.g., no external S/PDIF receiver/transmitter required) and simplifies PCB layout |
| USB HID volume/mute control | Enables hardware-level volume adjustment and mute via dedicated GPIOs - works with Windows/macOS native drivers |
| On-chip analog filters | Includes antialiasing (ADC) and low-pass (DAC) filters with –0.03 dB flatness to 20 kHz - removes need for external RC networks |
| Bus-powered operation | Draws ≤67 mA at 5 V during active audio streaming - compliant with USB 1.1 100-mA limit without auxiliary power |
Applications
| USB Audio Interface Box | USB Headset |
|---|---|
Use Scenario: Desktop or laptop audio expansion with mic-in, line-out, and digital S/PDIF loopback capability. IC Role / Device Role / Timing Role: Central stereo codec handling bidirectional analog/digital conversion, USB streaming, and S/PDIF passthrough. Use Value: Single-chip integration reduces latency, eliminates external clock sources, and supports simultaneous 48-kHz playback + 44.1-kHz record via SpAct™. |
Use Scenario: Plug-and-play headset with analog mic and speaker plus hardware mute/volume buttons. IC Role / Device Role / Timing Role: Audio interface managing mono mic input, stereo speaker output, and HID button reporting over shared USB endpoint. Use Value: HID pins (HID0–HID2) enable OS-native mute/volume control without firmware or custom drivers. |
| USB Monitor Speaker | USB Audio Speaker |
Use Scenario: Flat-panel monitor with built-in stereo speakers and optional S/PDIF input for TV or game console audio. IC Role / Device Role / Timing Role: DAC-centric audio processor converting USB isochronous data to analog output while accepting external S/PDIF. Use Value: DOUT pin feeds S/PDIF to external DAC or amplifier; VOUTL/VOUTR drive line-level inputs directly with <0.005% THD+N. |
Use Scenario: Self-powered desktop speaker system requiring USB audio input and local volume control. IC Role / Device Role / Timing Role: Full-featured USB audio endpoint with adaptive playback, suspend detection (SSPND), and bus-powered operation. Use Value: SSPND output gates speaker amplifier power during USB suspend, reducing standby current to 210 µA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stereo USB audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCM2900E | No S/PDIF I/O (DIN/DOUT pins absent); otherwise identical pinout, USB interface, and analog performance | Cannot support digital audio passthrough or optical/coaxial input; limited to analog-only USB audio systems | Select when S/PDIF is unnecessary and cost reduction is prioritized - same footprint and layout compatibility |
| CY7C66113-BZXI | USB microcontroller (not audio codec); requires external ADC/DAC and S/PDIF transceivers; no SpAct™ or integrated analog filters | Demands full firmware development for USB audio class, custom analog signal chain design, and external clock management | Choose only for highly customized, multi-function USB peripherals where audio is one of several supported protocols |
Compared with PCM2902EG4, PCM2900E offers identical USB audio functionality without S/PDIF - ideal for analog-only headsets - while CY7C66113-BZXI shifts full audio subsystem responsibility to the designer, increasing BOM, layout complexity, and firmware effort.
Availability
PCM2902EG4 is available at Aetrix Electronics and suitable for USB audio interface boxes, monitor speakers, and headset designs requiring stable component supply, long-lifecycle support, and compliance with USB-IF certification standards.
Supply support for PCM2902EG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in high-fidelity audio signal chains.
The PCM2900/2902 family was designed specifically for cost-sensitive, bus-powered USB audio peripherals - integrating USB protocol, S/PDIF, and precision analog I/O into a single SSOP package to minimize system-level complexity.
FAQ
What is the maximum sampling rate supported by the PCM2902EG4 DAC?
The PCM2902EG4 DAC supports fixed sampling rates of 32 kHz, 44.1 kHz, and 48 kHz in USB adaptive mode. It does not support variable or higher rates like 96 kHz. These rates are selected dynamically by the host USB audio driver based on stream configuration - the PCM2902EG4 itself contains no programmable sample-rate converter.
Does the PCM2902EG4 require an external crystal oscillator?
Yes, the PCM2902EG4 requires a 12-MHz fundamental-mode crystal connected between XTI (Pin 21) and XTO (Pin 20). This crystal enables the on-chip PLL to generate the 96-MHz clock needed for SpAct™ operation and USB timing. The crystal must meet ±8 kHz frequency tolerance per the datasheet specification.
Can the PCM2902EG4 operate from a 3.3-V supply instead of 5 V?
No - the PCM2902EG4 is designed exclusively for 5-V USB bus power (VBUS). Its absolute maximum VBUS rating is 6.5 V, and minimum operating voltage is 4.35 V. Internal regulators generate 3.3-V analog/digital rails, but applying 3.3 V directly to VBUS will prevent proper operation and may damage the device.
How does the S/PDIF interface on the PCM2902EG4 differ from the PCM2900E?
The PCM2902EG4 includes dedicated DIN (Pin 24) and DOUT (Pin 25) terminals for S/PDIF I/O, whereas the PCM2900E omits these pins entirely - its Pin 24 is TEST0 and Pin 25 is TEST1. Functionally, PCM2902EG4's S/PDIF supports standard coaxial electrical signaling at 3.3-V CMOS levels with 5-V tolerance, enabling direct connection to common S/PDIF receivers/transmitters.
Is the PCM2902EG4 compatible with USB 2.0 hosts?
Yes - the PCM2902EG4 is USB 1.1 full-speed compliant (12 Mbps) and fully backward-compatible with USB 2.0 and USB 3.x hosts. It enumerates as a standard USB Audio Class 1.0 device and requires no special drivers on Windows, macOS, or Linux. Bandwidth is sufficient for stereo 16-bit/48-kHz audio with overhead for HID control.
PCM2902EG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Type:
- Stereo Audio
- Data Interface:
- USB
- Resolution (Bits):
- 16 b
- Number of ADCs / DACs:
- 2 / 2
- Sigma Delta:
- Yes
- S/N Ratio, ADCs / DACs (db) Typ:
- 89 / 96
- Dynamic Range, ADCs / DACs (db) Typ:
- 89 / 93
- Voltage - Supply, Analog:
- 4.35V ~ 5.25V
- Voltage - Supply, Digital:
- 4.35V ~ 5.25V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
PCM2902EG4 FAQ
1.How can I place an order for PCM2902EG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2902EG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PCM2902EG4 reliable?
The price and inventory of PCM2902EG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2902EG4 is usually 5 days.
3.What payment methods are accepted for PCM2902EG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2902EG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2902EG4?
PCM2902EG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2902EG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PCM2902EG4?
For technical support, including PCM2902EG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2902EG4 requirements.
6.How does Aetrix verify that PCM2902EG4 is sourced from the original manufacturer or authorized distributors?
All PCM2902EG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PCM2902EG4 meets industry standards.
7.What is the process for return or replacement of PCM2902EG4?
All PCM2902EG4 units undergo pre-shipment inspection (PSI). If there is an issue with PCM2902EG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PCM2902EG4 part is unused and in its original packaging.
Return procedure for PCM2902EG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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