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Texas Instruments PCM2902CDB
- Part No.:
- PCM2902CDB
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2902CDB.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,035
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Product details
Overview
PCM2902CDB from Texas Instruments is a stereo audio codec IC with integrated USB 2.0 full-speed interface, 16-bit delta-sigma ADC/DAC, S/PDIF input/output, and on-chip clock recovery via SpAct™ architecture. It delivers 96 dB SNR (DAC), 89 dB SNR (ADC), ±0.1 dB passband ripple, and operates from a single 5 V supply in SSOP-28 package for USB audio endpoint applications.
For engineers reviewing the PCM2902CDB datasheet, PCM2902CDB pinout, PCM2902CDB application, or PCM2902CDB equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed S/PDIF-enabled use cases, and two field-tested alternative parts with documented functional trade-offs.
Technical Context
The PCM2902CDB implements dual-mode USB audio streaming: adaptive mode for playback (DAC) and asynchronous mode for recording (ADC), enabling independent sample rate control. Its SpAct™ architecture recovers audio clock directly from USB packet timing, eliminating external crystal PLL jitter and supporting 32/44.1/48 kHz DAC rates and 8–48 kHz ADC rates.
It integrates analog antialiasing (ADC) and low-pass (DAC) filters, digital decimation/interpolation filters with –65 dB stopband attenuation (ADC) and –43 dB (DAC), plus S/PDIF encoder/decoder logic-functionality absent in the pin-compatible PCM2900CDB variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC SNR | 96 dB A-weighted - enables high-fidelity playback with >15-bit effective resolution in noise-sensitive audio systems |
| ADC THD+N | 0.01% at –1 dBFS - supports clean microphone or line-in capture without audible harmonic distortion |
| S/PDIF I/O | 3.3-V CMOS-level DIN/DOUT with internal pull-down - allows direct connection to optical/toslink transceivers without level-shifting |
| USB Compliance | Fully compliant with USB 2.0 specification and certified by USB-IF - ensures plug-and-play compatibility across Windows/macOS/Linux hosts |
| Sampling Rates | DAC: 32/44.1/48 kHz; ADC: 8–48 kHz - covers CD, streaming, VoIP, and legacy telephony sampling requirements |
| Package | SSOP-28 (DB), –25°C to +85°C - surface-mount compatible with standard reflow profiles and industrial ambient operation |
| Power Supply | Single 5 V (VBUS), 67 mA typical - simplifies power design by eliminating need for separate analog/digital rails |
Pinout & Package
PCM2902CDB uses a 28-pin SSOP (DB) package with 0.65 mm pitch, 9.7 mm × 3.9 mm body size, and exposed thermal pad not connected internally. Pin functions are validated per TI SBFS039 datasheet Rev. SEPTEMBER 2011.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN (Pin 24) | S/PDIF input | 3.3-V CMOS-level receiver for coaxial or optical digital audio; requires no external termination resistor |
| DOUT (Pin 25) | S/PDIF output | CMOS-level transmitter driving 75 Ω coaxial cable or optical TOSLINK emitter directly |
| VINL/VINR (Pins 12,13) | ADC analog inputs | Single-ended, 0.6×VCCCI differential swing inputs with integrated antialiasing filter |
| VOUTL/VOUTR (Pins 16,15) | DAC analog outputs | Single-ended voltage outputs referenced to VCOM (VCCCI/2), with integrated LPF and 10 kΩ load capability |
| SSPND (Pin 28) | Suspend flag | Active-low open-drain output signaling USB suspend state to host or system controller |
| HID0/HID1/HID2 (Pins 5–7) | HID control inputs | 3.3-V CMOS mute/volume-up/volume-down keys with internal pull-down - generate USB HID reports without firmware |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ clock recovery | Eliminates external crystal oscillator and reduces jitter to <100 ps RMS - critical for bit-perfect audio playback |
| Integrated S/PDIF transceiver | Enables bidirectional digital audio transport without external PHY - reduces BOM count and PCB area by 3+ components |
| USB HID endpoint | Supports plug-and-play volume/mute controls via standard USB HID class - no custom driver required on host OS |
| On-chip analog filters | Antialiasing (ADC) and low-pass (DAC) filters meet EIAJ/IEC-60958 requirements - removes need for external RC networks |
| Bus-powered operation | Draws ≤100 mA from VBUS - qualifies as low-power USB device, eliminating dedicated power supply in portable designs |
Applications
| USB Audio Speaker | USB Headset |
|---|---|
Use Scenario: Compact desktop speaker with USB plug-and-play connectivity and hardware volume control. IC Role / Device Role / Timing Role: PCM2902CDB acts as USB audio endpoint, performing DAC conversion, analog output filtering, and HID volume/mute reporting. Use Value: Delivers 96 dB SNR playback and zero-latency HID response - eliminates need for MCU or external audio controller. | Use Scenario: Dual-mode headset supporting both microphone input and stereo playback over single USB cable. IC Role / Device Role / Timing Role: PCM2902CDB serves as full-duplex audio codec with asynchronous ADC (mic) and adaptive DAC (speaker), plus S/PDIF loopback for monitoring. Use Value: Enables simultaneous 48 kHz recording and playback with independent clocks - avoids USB bandwidth contention and dropouts. |
| USB Monitor | USB Audio Interface Box |
Use Scenario: All-in-one monitor with built-in speakers and mic input for video conferencing. IC Role / Device Role / Timing Role: PCM2902CDB handles stereo DAC output to speakers and mono/stereo ADC input from mic array, using HID for mute control. Use Value: Single-chip solution reduces layout complexity and meets USB audio class 1.0 compliance - accelerates CE/FCC certification. | Use Scenario: External audio interface connecting microphones/instruments to PC with S/PDIF passthrough. IC Role / Device Role / Timing Role: PCM2902CDB functions as bidirectional S/PDIF bridge: converting USB audio ↔ S/PDIF while maintaining sample rate integrity. Use Value: Supports professional-grade 24-bit/48 kHz S/PDIF I/O with <0.01% THD+N - preserves studio-quality signal chain integrity. |
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 |
|---|---|---|---|
| PCM2900CDB | No S/PDIF I/O; identical pinout, USB interface, and analog performance except missing DIN/DOUT pins (24/25) | Cannot support digital audio passthrough or optical output; suitable only for pure analog I/O designs | Select PCM2900CDB when S/PDIF is unnecessary and cost reduction is prioritized |
| CY7C68013A-56PVXC | USB 2.0 microcontroller (FX2LP) with no integrated ADC/DAC; requires external audio codec and S/PDIF PHY | Demands full firmware development for USB audio class, HID, and clock management - increases time-to-market | Choose CY7C68013A only when custom USB descriptors, multi-function HID, or non-standard sample rates are required |
Compared with PCM2900CDB, PCM2902CDB adds S/PDIF functionality without changing layout or power design; compared with CY7C68013A, it eliminates firmware development and external analog components but fixes USB audio class compliance and sample rate flexibility.
Availability
PCM2902CDB is available at Aetrix Electronics and suitable for USB audio speaker, USB headset, and USB monitor applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for PCM2902CDB 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 over 50 years of innovation in precision signal chain solutions.
The PCM2900C/2902C product line was designed specifically for cost-sensitive, low-footprint USB audio endpoints requiring zero-driver installation, integrated clock recovery, and compliance with USB audio class 1.0 standards.
FAQ
What is the maximum supported sampling rate for ADC and DAC in PCM2902CDB?
The PCM2902CDB supports DAC sampling rates of 32 kHz, 44.1 kHz, and 48 kHz in adaptive mode. For ADC, it supports rates from 8 kHz up to 48 kHz in asynchronous mode, including 11.025 kHz and 22.05 kHz for legacy compatibility. These values are specified in the Electrical Characteristics table of the TI SBFS039 datasheet and validated across temperature and supply voltage ranges. PCM2902CDB does not support 96 kHz or higher sample rates.
Does PCM2902CDB require an external crystal oscillator?
No, PCM2902CDB does not require an external crystal oscillator for USB audio operation. It uses an internal 12 MHz crystal oscillator (XTI/XTO pins) combined with SpAct™ architecture to recover audio clock from USB packet timing, eliminating crystal-related jitter and reducing BOM cost. The datasheet specifies XTI input frequency tolerance as ±8 ppm, and operation is guaranteed with a standard 12.000 MHz ±100 ppm crystal.
How does the S/PDIF functionality differ between PCM2902CDB and PCM2900CDB?
PCM2902CDB includes dedicated DIN (Pin 24) and DOUT (Pin 25) terminals for S/PDIF input and output, implemented as 3.3-V CMOS-level interfaces with internal pull-downs. PCM2900CDB lacks these pins entirely - its pin 24 is TEST0 (must tie to GND) and pin 25 is TEST1 (must leave open). This makes PCM2902CDB the only variant capable of bidirectional digital audio transport without external logic.
Can PCM2902CDB operate in bus-powered mode without external regulators?
Yes, PCM2902CDB is fully bus-powered from VBUS (5 V) and contains an internal 5-V-to-3.3-V regulator. All internal supplies - VCCCI, VCCP1I, VCCP2I, VCCXI, and VDDI - are generated on-chip. The datasheet specifies 67 mA typical supply current at 44.1 kHz, well within USB 2.0's 100 mA limit. No external LDOs or DC/DC converters are required for basic operation.
What human interface functions does PCM2902CDB support natively?
PCM2902CDB supports native USB HID consumer control reporting for mute (HID0), volume up (HID1), and volume down (HID2) via dedicated CMOS inputs with internal pull-downs. These generate standard USB HID reports without firmware intervention, enabling immediate OS-level control in Windows, macOS, and Linux. The device does not support play/pause, track skip, or custom HID descriptors beyond these three functions.
PCM2902CDB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 3.1V ~ 3.5V
- Voltage - Supply, Digital:
- 3.1V ~ 3.5V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
PCM2902CDB FAQ
1.How can I place an order for PCM2902CDB through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2902CDB 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 PCM2902CDB reliable?
The price and inventory of PCM2902CDB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2902CDB is usually 5 days.
3.What payment methods are accepted for PCM2902CDB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2902CDB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2902CDB?
PCM2902CDB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2902CDB 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 PCM2902CDB?
For technical support, including PCM2902CDB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2902CDB requirements.
6.How does Aetrix verify that PCM2902CDB is sourced from the original manufacturer or authorized distributors?
All PCM2902CDB 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 PCM2902CDB meets industry standards.
7.What is the process for return or replacement of PCM2902CDB?
All PCM2902CDB units undergo pre-shipment inspection (PSI). If there is an issue with PCM2902CDB, 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 PCM2902CDB part is unused and in its original packaging.
Return procedure for PCM2902CDB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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