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Texas Instruments PCM2903E/2K
- Part No.:
- PCM2903E/2K
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2903E/2K.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,054
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Product details
Overview
PCM2903E/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 clock generator. It delivers THD+N = 0.01% (ADC) and 0.005% (DAC), SNR = 89 dB (ADC) / 96 dB (DAC), and supports sampling rates up to 48 kHz for playback and record in USB adaptive/asynchronous modes. It targets USB audio endpoints requiring self-powered, single-supply (3.3 V) operation with minimal external components.
For engineers reviewing the PCM2903E/2K datasheet, PCM2903E/2K pinout, PCM2903E/2K application, or PCM2903E/2K equivalent, this device is selected for embedded USB audio interfaces where S/PDIF I/O, low-jitter SpAct™ clock recovery, HID volume/mute control, and SSOP-28 package compatibility are required - not for non-USB or multi-channel (>2) audio systems.
Technical Context
The PCM2903E/2K integrates a USB protocol controller compliant with USB 1.1, eliminating host-side firmware requirements while supporting configurable descriptors (vendor ID/product ID). Its SpAct™ architecture recovers audio clocks directly from USB packet timing, enabling independent playback and record sampling without external PLLs.
It features dual analog front-ends: a decimation digital filter for ADC (–65 dB stop-band attenuation, ±0.05 dB pass-band ripple) and interpolation digital filter for DAC (–43 dB stop-band attenuation, ±0.1 dB pass-band ripple), plus integrated analog antialiasing and low-pass filters. Power management includes suspend mode (210 µA) and self-powered operation via VBUS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit delta-sigma ADC and DAC - enables CD-quality audio digitization and reconstruction with 96 dB dynamic range. |
| THD+N (DAC) | 0.005% at 0 dB output - ensures high-fidelity playback with minimal harmonic distortion in consumer audio paths. |
| SNR (ADC) | 89 dB A-weighted - provides clean microphone or line-in signal capture with low noise floor in USB headsets. |
| Sampling Rates | DAC: 32/44.1/48 kHz; ADC: 8–48 kHz - supports standard audio formats including CD (44.1 kHz) and DVD (48 kHz) without resampling. |
| Supply Voltage | 3.0–3.6 V (typical 3.3 V) - allows direct connection to common USB-powered 3.3 V rails with no LDO required. |
| Suspend Current | 210 µA - enables ultra-low-power standby in battery-backed USB peripherals like portable audio interfaces. |
| S/PDIF Support | Integrated DIN/DOUT pins with 3.3-V CMOS-level I/O - eliminates need for external transceivers in digital audio routing applications. |
Pinout & Package
PCM2903E/2K is housed in a 28-pin SSOP (Small Outline Package) with 0.65 mm pitch, optimized for compact USB audio PCB layouts and compatible with standard reflow profiles (peak 250 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+, D– | USB differential transceiver I/O | LV-TTL level interface to USB host; requires 27-Ω series resistors and ESD protection per USB 1.1 spec. |
| VINL, VINR | ADC analog inputs | Single-ended voltage inputs referenced to VCOM (VCCC/2); accept 0.6 VCCC p-p signals with 30 kΩ input impedance. |
| VOUTL, VOUTR | DAC analog outputs | Single-ended voltage outputs with 0.6 VCCC p-p swing; require AC-coupling and 10-kΩ load for LPF compliance. |
| DIN, DOUT | S/PDIF digital I/O | 3.3-V CMOS-level S/PDIF input/output with internal pulldown (DIN); enables direct optical/coaxial digital audio interfacing. |
| HID0–HID2 | HID control inputs | Active-high mute/volume-up/volume-down keys; inform host OS of user controls without affecting audio path. |
| SSPND | Suspend flag output | Active-low open-drain signal indicating USB suspend state; used to gate power to downstream analog stages. |
| XTI/XTO | Crystal oscillator interface | Supports 12 MHz ±6 kHz crystal; internal PLL generates 96 MHz clock for USB and audio processing. |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ clock recovery | Eliminates external crystal for USB audio sync; reduces jitter to enable high-SNR playback without master clock source. |
| Integrated analog filters | On-chip antialiasing (ADC) and low-pass (DAC) filters meet EIAJ/A-weighted specs - removes need for external RC networks. |
| Partially programmable descriptors | Vendor ID (0x08BB) and Product ID (0x2903) can be customized - supports OEM branding and driver differentiation. |
| HID volume/mute control | Dedicated GPIOs (HID0–HID2) map to standard USB HID usage pages - enables plug-and-play OS-level audio control without custom drivers. |
| Self-powered USB operation | Draws power from VBUS (pin 3 → VDD); operates with no external supply - simplifies design for bus-powered headsets and speakers. |
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: Stereo DAC + USB interface + HID controller; handles playback stream decoding, analog output generation, and volume/mute signaling. Use Value: Single-chip solution replaces separate USB controller, DAC, and microcontroller - reduces BOM count by ≥4 components and PCB area by >30%. |
Use Scenario: Dual-mode headset supporting analog mic input and USB digital audio streaming to PC. IC Role / Device Role / Timing Role: Stereo ADC + DAC + S/PDIF I/O; digitizes mic signal, renders PC audio, and routes digital audio to external S/PDIF receiver. Use Value: Simultaneous bidirectional audio with independent sampling clocks - avoids USB bandwidth contention and enables zero-latency sidetone. |
| USB Monitor Audio Hub | USB Audio Interface Box |
Use Scenario: All-in-one monitor with built-in speakers, mic input, and USB-C/USB-A upstream port. IC Role / Device Role / Timing Role: Full-duplex audio codec with suspend flag (SSPND); manages audio I/O, power gating during display sleep, and HID reporting. Use Value: SSPND output synchronizes analog stage shutdown with USB suspend - cuts system idle power by 210 µA without firmware intervention. |
Use Scenario: Prosumer audio interface connecting microphones/instruments to DAW software via USB. IC Role / Device Role / Timing Role: High-fidelity ADC/DAC with S/PDIF loopback; captures analog sources, renders DAW output, and routes digital tracks to external gear. Use Value: S/PDIF I/O enables bit-transparent digital monitoring and recording - preserves 24-bit integrity without analog conversion loss. |
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 |
|---|---|---|---|
| PCM2901E/2K | Lacks S/PDIF I/O (no DIN/DOUT pins); identical ADC/DAC performance, pinout, and USB functionality. | Not suitable for designs requiring digital audio passthrough or optical output; otherwise drop-in for basic USB speaker/headset. | Select PCM2903E/2K only when S/PDIF routing or external digital audio synchronization is required. |
| CY7C66113-BZXI | USB 2.0 peripheral controller with external ADC/DAC interface; no integrated audio converters or analog filters. | Requires external audio components and layout for analog signal chain - increases design complexity and cost. | Choose only when flexible multi-function USB peripheral capability outweighs integration benefits of PCM2903E/2K. |
Compared with PCM2901E/2K, PCM2903E/2K adds S/PDIF I/O without sacrificing audio fidelity or power efficiency; compared with CY7C66113-BZXI, it delivers complete audio subsystem integration - reducing component count, layout area, and qualification effort for USB audio endpoints.
Availability
PCM2903E/2K is available at Aetrix Electronics and suitable for USB audio speaker, USB headset, and USB monitor audio hub applications requiring stable component supply, tape-and-reel packaging (2000 pcs/reel), and long-term industrial availability.
Supply support for PCM2903E/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 specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in high-performance audio signal chains.
The PCM2903E/2K belongs to TI's Burr-Brown audio codec product line, designed specifically for cost-sensitive, space-constrained USB audio peripherals requiring integrated analog front-end, digital audio processing, and USB protocol handling.
FAQ
What is the operating temperature range for the PCM2903E/2K?
The PCM2903E/2K is specified for operation from –25°C to +85°C ambient temperature. This industrial-grade range supports reliable deployment in USB audio devices exposed to varying environmental conditions, including desktop peripherals and embedded monitors. The device's thermal resistance (θJA = 100°C/W) ensures safe junction temperatures under typical 70 mA operational current at 3.3 V.
Does the PCM2903E/2K require an external crystal?
Yes, the PCM2903E/2K requires a 12 MHz ±6 kHz crystal connected between XTI (pin 21) and XTO (pin 20). This crystal feeds the on-chip PLL that generates the 96 MHz clock for USB and audio processing. The device does not support external clock input - only crystal-based oscillation is supported per the datasheet.
Can the PCM2903E/2K operate in bus-powered mode?
Yes, the PCM2903E/2K supports self-powered operation via VBUS (pin 3), which must be connected to VDD (pin 27). In this configuration, it draws power directly from the USB host port and consumes 54–70 mA during active audio operation - well within USB 1.1 full-speed bus-power limits (100 mA).
How does the S/PDIF interface on the PCM2903E/2K differ from the PCM2901E/2K?
The PCM2903E/2K includes dedicated DIN (pin 24) and DOUT (pin 25) terminals for S/PDIF input and output, whereas the PCM2901E/2K omits these pins entirely. Both share identical ADC/DAC performance, USB functionality, and pinout except for those two S/PDIF signals - making them mechanically incompatible for S/PDIF-capable designs.
What USB descriptors are modifiable on the PCM2903E/2K?
The vendor ID (default 0x08BB), product ID (default 0x2903), vendor string (#1), and product string (#2) can be modified upon request through Texas Instruments. The USB revision (1.1), device class (0x00), and configuration descriptors remain fixed. Modifications require TI support and are implemented at mask level - not field-programmable.
PCM2903E/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:
- Obsolete
- 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:
- 3V ~ 3.6V
- Voltage - Supply, Digital:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
PCM2903E/2K FAQ
1.How can I place an order for PCM2903E/2K through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2903E/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 PCM2903E/2K reliable?
The price and inventory of PCM2903E/2K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2903E/2K is usually 5 days.
3.What payment methods are accepted for PCM2903E/2K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2903E/2K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2903E/2K?
PCM2903E/2K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2903E/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 PCM2903E/2K?
For technical support, including PCM2903E/2K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2903E/2K requirements.
6.How does Aetrix verify that PCM2903E/2K is sourced from the original manufacturer or authorized distributors?
All PCM2903E/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 PCM2903E/2K meets industry standards.
7.What is the process for return or replacement of PCM2903E/2K?
All PCM2903E/2K units undergo pre-shipment inspection (PSI). If there is an issue with PCM2903E/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 PCM2903E/2K part is unused and in its original packaging.
Return procedure for PCM2903E/2K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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