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Texas Instruments PCM2902E/2K
- Part No.:
- PCM2902E/2K
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2902E/2K.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,240
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Product details
Overview
PCM2902E/2K 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 SpAct™ clock recovery architecture. It operates from a single 5-V USB bus supply, supports independent ADC (8–48 kHz) and DAC (32–48 kHz) sampling rates, and delivers 89 dB SNR (ADC) and 96 dB SNR (DAC) at 44.1 kHz - used in USB audio interface boxes and professional headset designs.
For engineers reviewing the PCM2902E/2K datasheet, PCM2902E/2K pinout, PCM2902E/2K application, or PCM2902E/2K equivalent, key selection considerations include its SSOP-28 package, S/PDIF capability (distinguishing it from PCM2900), USB HID volume/mute control support, and SpAct-based jitter reduction for low-latency audio streaming.
Technical Context
The PCM2902E/2K implements TI's SpAct™ architecture to recover audio clocks directly from USB packet timing, eliminating external crystal oscillators for playback and enabling independent adaptive (playback) and asynchronous (record) USB audio modes. Its analog front-end integrates antialiasing (ADC) and low-pass (DAC) filters, while digital decimation/interpolation filters provide ±0.05 dB pass-band ripple and 65 dB stop-band attenuation.
It features four USB interfaces: Interface #0 (audio control), #1 (ISO-out streaming), #2 (ISO-in streaming), and #3 (HID for mute/volume buttons). S/PDIF functionality is implemented via dedicated DIN/DOUT pins with 3.3-V CMOS-level I/O and internal pulldown, distinct from the PCM2900 variant which lacks these terminals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 16-bit delta-sigma with 8–48 kHz sampling (supports legacy 8/11.025/16/22.05 kHz rates) |
| DAC Resolution | 16-bit delta-sigma with 32/44.1/48 kHz fixed-rate playback |
| Analog Performance | ADC: THD+N = 0.01%, SNR = 89 dB; DAC: THD+N = 0.005%, SNR = 96 dB (at VBUS = 5 V, fS = 44.1 kHz) |
| USB Compliance | Fully compliant with USB 1.1 specification; certified by USB-IF; full-speed (12 Mbps) transceivers on D+/D– |
| S/PDIF Support | Dedicated DIN (pin 24) and DOUT (pin 25); 3.3-V CMOS, 5-V tolerant, internal pulldown |
| Power Supply | Single 5-V USB bus supply (VBUS = 4.35–5.25 V); draws 67 mA typical during ADC+DAC operation |
| Operating Temp | –25°C to +85°C ambient; specified for industrial-grade USB audio peripheral deployment |
Pinout & Package
Package: 28-pin SSOP (28DB), surface-mount, 0.635 mm pitch, body size 10.2 × 5.3 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN (24) | S/PDIF input | 3.3-V CMOS-level receiver with internal pulldown; enables digital audio input without external level-shifting |
| DOUT (25) | S/PDIF output | 3.3-V CMOS-level transmitter; drives standard coaxial S/PDIF loads (75 Ω) |
| VINL/VINR (12/13) | ADC analog inputs | Single-ended, 0.6×VCCCI p-p full-scale; include on-chip antialiasing filter (–3 dB @ 150 kHz) |
| VOUTL/VOUTR (16/15) | DAC analog outputs | Single-ended, 0.6×VCCCI p-p; include on-chip low-pass filter (–3 dB @ 250 kHz) |
| XTI/XTO (21/20) | Crystal oscillator interface | Supports 12 MHz fundamental-mode crystal (11.994–12.008 MHz); required only if S/PDIF master clock or precise jitter control needed |
| SEL0/SEL1 (8/9) | Configuration select | Must be tied high (5-V tolerant TTL Schmitt trigger); configures device as PCM2902 (S/PDIF enabled) |
| HID0–HID2 (5–7) | HID control inputs | 3.3-V CMOS active-high inputs for mute/volume up/down; reported to host via USB HID class without ADC/DAC path involvement |
| SSPND (28) | Suspend flag output | Active-low open-drain signal indicating USB suspend state; used for system power management coordination |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ clock recovery | Eliminates need for separate audio PLL; recovers low-jitter 44.1/48 kHz clocks directly from USB packet timing |
| Independent adaptive/asynchronous modes | Playback uses USB packet timing (adaptive); recording uses local clock (asynchronous), enabling simultaneous bidirectional streaming at different sample rates |
| Integrated analog filtering | On-chip antialiasing (ADC) and low-pass (DAC) filters reduce external component count and PCB area |
| Partially programmable USB descriptors | Vendor ID, Product ID, and string descriptors modifiable per TI request - supports OEM branding without firmware development |
| Bus-powered operation | Draws ≤67 mA from VBUS; meets USB 1.1 100 mA limit with margin for S/PDIF and HID functions |
Applications
| USB Audio Interface Box | Professional USB Headset |
|---|---|
Use Scenario: Desktop or studio audio interface connecting microphones/instruments to PC via USB, with line-level analog I/O and S/PDIF digital passthrough. IC Role / Device Role / Timing Role: Primary stereo audio codec handling bidirectional 16-bit streaming, S/PDIF bridging, and HID volume control - managed entirely by USB audio class drivers. Use Value: Enables zero-driver plug-and-play operation on Windows/macOS/Linux; SpAct™ ensures <100 ns RMS jitter for clean 24-bit/96 kHz-capable analog paths. | Use Scenario: Dual-mic, stereo-output USB headset for call centers or VoIP conferencing with hardware mute button and sidetone control. IC Role / Device Role / Timing Role: Integrated ADC/DAC processes mic input and speaker output; HID0–HID2 pins route physical button presses to OS-level mute/volume without host CPU intervention. Use Value: Reduces BOM by integrating USB PHY, audio converters, filters, and HID logic - eliminates need for separate MCU or USB controller. |
| USB Monitor Speaker System | Embedded Audio Capture Module |
Use Scenario: Compact powered monitor speakers with USB input, analog line-in, and optical S/PDIF input for multi-source switching. IC Role / Device Role / Timing Role: Acts as USB audio endpoint and S/PDIF decoder/encoder; routes digital streams between USB host and speaker amplifier via analog or S/PDIF paths. Use Value: Supports seamless source switching with no driver reload; S/PDIF I/O allows daisy-chaining to other digital audio devices without format conversion loss. | Use Scenario: Industrial sound-level recorder capturing environmental audio with timestamped metadata over USB to embedded Linux host. IC Role / Device Role / Timing Role: Provides low-power, high-SNR analog capture (89 dB SNR) with flexible sampling (8–48 kHz) and USB isochronous streaming - immune to host clock drift via SpAct™. Use Value: Ensures consistent audio fidelity across variable host USB bandwidth; suspend mode draws only 210 µA for battery-backed logging. |
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/2K | No S/PDIF I/O (pins 24/25 unused); identical pinout and USB/HID functionality | Not suitable where optical digital I/O or S/PDIF passthrough is required | Select PCM2902E/2K when S/PDIF support is mandatory; PCM2900E/2K reduces cost where digital I/O is unnecessary |
| CY7C68013A-56PVXC | USB 2.0 FX2LP microcontroller (not an audio codec); requires external ADC/DAC and firmware | Demands custom driver/firmware development; no native USB audio class compliance | Choose PCM2902E/2K for turnkey USB audio class compliance; CY7C68013A only when proprietary protocols or non-standard sample rates are needed |
Compared with PCM2900E/2K, the PCM2902E/2K adds S/PDIF I/O without changing footprint or power requirements; versus CY7C68013A, it delivers fully autonomous, driverless audio streaming with integrated analog signal chain and jitter-controlled clocking.
Availability
PCM2902E/2K is available at Aetrix Electronics and suitable for USB audio interface boxes, professional headsets, and embedded audio capture modules requiring stable component supply, long-term industrial temperature support (–25°C to +85°C), and guaranteed tape-and-reel packaging (2000 pcs/reel).
Supply support for PCM2902E/2K 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 focused on analog, embedded processing, and connectivity technologies, serving industrial, automotive, and consumer markets with high-reliability components.
The PCM2900/2902 product line was designed specifically for USB audio peripherals requiring minimal external components, driverless operation, and robust jitter performance - targeting cost-sensitive yet performance-critical audio endpoints.
FAQ
What distinguishes PCM2902E/2K from PCM2900E/2K?
The PCM2902E/2K includes dedicated S/PDIF input (DIN, pin 24) and output (DOUT, pin 25) functionality, while the PCM2900E/2K omits these pins and associated circuitry. Both share identical SSOP-28 packaging, USB HID controls, SpAct™ clock recovery, and analog performance specs. The PCM2902E/2K is selected when optical digital audio I/O is required.
Does PCM2902E/2K require an external crystal oscillator?
The PCM2902E/2K can operate without an external crystal using its internal USB-derived clock for basic audio streaming. However, a 12-MHz crystal connected to XTI/XTO (pins 21/20) is required to enable S/PDIF master clocking, precise jitter control, or operation outside nominal USB frame timing tolerances - as specified in the PCM2902 terminal functions table.
How does PCM2902E/2K handle USB suspend mode?
In USB suspend mode, the PCM2902E/2K asserts SSPND (pin 28) low and reduces supply current to 210 µA. All analog functions halt, but the USB transceiver remains responsive to resume signaling. The device resumes full operation within 10 ms of resume detection - meeting USB 1.1 suspend/resume timing requirements without host-side driver changes.
Can PCM2902E/2K support 96 kHz sampling?
No. The PCM2902E/2K supports ADC sampling at 8, 11.025, 16, 22.05, 32, 44.1, and 48 kHz, and DAC playback at 32, 44.1, and 48 kHz only. It does not support 96 kHz or higher rates. This limitation is inherent to the SpAct™ architecture and digital filter design documented in the SLES035E datasheet's electrical characteristics tables.
Is PCM2902E/2K compatible with modern operating systems without custom drivers?
Yes. The PCM2902E/2K implements standard USB audio class (UAC) 1.0 descriptors and is natively supported on Windows (XP onward), macOS (10.4 onward), and Linux (ALSA UAC module) without additional drivers. HID volume/mute controls appear as standard OS audio controls, and all streaming uses class-compliant isochronous endpoints.
PCM2902E/2K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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
PCM2902E/2K FAQ
1.How can I place an order for PCM2902E/2K through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2902E/2K 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 PCM2902E/2K reliable?
The price and inventory of PCM2902E/2K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2902E/2K is usually 5 days.
3.What payment methods are accepted for PCM2902E/2K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2902E/2K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2902E/2K?
PCM2902E/2K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2902E/2K 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 PCM2902E/2K?
For technical support, including PCM2902E/2K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2902E/2K requirements.
6.How does Aetrix verify that PCM2902E/2K is sourced from the original manufacturer or authorized distributors?
All PCM2902E/2K 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 PCM2902E/2K meets industry standards.
7.What is the process for return or replacement of PCM2902E/2K?
All PCM2902E/2K units undergo pre-shipment inspection (PSI). If there is an issue with PCM2902E/2K, 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 PCM2902E/2K part is unused and in its original packaging.
Return procedure for PCM2902E/2K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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