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Texas Instruments PCM2903E
- Part No.:
- PCM2903E
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2903E.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,938
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Product details
Overview
PCM2903E 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 using a single 12-MHz crystal. It delivers 96 dB SNR (DAC) and 89 dB SNR (ADC) at 3.3 V, supporting USB headset and audio interface box applications with self-powered operation.
For engineers reviewing the PCM2903E datasheet, PCM2903E pinout, PCM2903E application, or PCM2903E equivalent, key selection considerations include its SSOP-28 package, S/PDIF capability (distinguishing it from PCM2901), USB adaptive playback / asynchronous record modes, SpAct™ clock recovery architecture, and dual-role HID control support for mute/volume functions.
Technical Context
The PCM2903E integrates a USB protocol controller compliant with USB 1.1, eliminating host-side firmware requirements while supporting programmable descriptors (vendor ID/product ID). Its SpAct™ architecture recovers audio clocks from USB packet data to minimize jitter during independent playback and record sampling.
It features separate analog PLLs for ADC and DAC paths, on-chip decimation/interpolation digital filters, analog antialiasing and low-pass filters, and dedicated power domains (VCCC, VCCP1, VCCP2, VCCX, VDD) with individual ground pins (AGNDC, AGNDP, AGNDX, DGND, DGNDU) to isolate noise between signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC SNR | 96 dB (EIAJ, A-weighted) - enables high-fidelity playback in USB speaker/headset designs |
| ADC THD+N | 0.01% at –0.5 dB - supports clean microphone input capture in USB audio interfaces |
| Sampling Rates | DAC: 32/44.1/48 kHz; ADC: 8–48 kHz - covers CD, streaming, and telephony audio standards |
| S/PDIF Support | Input (DIN) and output (DOUT) - enables digital audio passthrough and external DAC integration |
| USB Mode | Adaptive playback + asynchronous record - ensures stable timing for bidirectional real-time audio |
| Supply Voltage | 3.3 V ±0.3 V - single-supply operation simplifies power design vs. dual-rail codecs |
| Operating Temp | –25°C to +85°C - suitable for commercial-grade embedded audio products |
Pinout & Package
PCM2903E is housed in a 28-pin SSOP (Small Outline Package) with 0.65 mm pitch, optimized for compact USB audio peripherals. Pin assignments are validated per TI SLES034C datasheet Rev. November 2007.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN (Pin 24) | S/PDIF input | 3.3-V CMOS-level digital audio input with internal pulldown; enables optical/coaxial digital source connection |
| DOUT (Pin 25) | S/PDIF output | 3.3-V CMOS-level digital audio output; supports daisy-chaining or external DAC interfacing |
| HID0–HID2 (Pins 5–7) | HID control inputs | Active-high mute/volume-up/volume-down signals; inform host OS of user controls without ADC/DAC involvement |
| SSPND (Pin 28) | Suspend flag output | Active-low open-drain signal indicating USB suspend state; used for system power management |
| VINL/VINR (Pins 12–13) | ADC analog inputs | Single-ended voltage inputs referenced to VCOM (VCCC/2); accept 0.6×VCCC p-p signals |
| VOUTL/VOUTR (Pins 16–15) | DAC analog outputs | Single-ended voltage outputs with integrated analog LPF; drive 10-kΩ AC-coupled loads |
| XTI/XTO (Pins 21–20) | Clock oscillator interface | Connects to 12-MHz fundamental-mode crystal; enables on-chip PLL generation of 96-MHz USB clock |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ clock recovery | Eliminates external PLL components and reduces jitter-sensitive layout constraints for USB audio sync |
| Integrated S/PDIF transceiver | Enables digital audio I/O without external transceivers-unique among PCM29xx family members |
| Programmable USB descriptors | Allows vendor ID/product ID customization for OEM branding and driver compatibility |
| Four-interface USB topology | Supports simultaneous audio streaming (in/out), HID control, and standard audio class control via distinct endpoints |
| Self-powered USB operation | Draws power directly from VBUS; no external regulator needed for bus-powered devices |
Applications
| USB Headset | USB Audio Interface Box |
|---|---|
Use Scenario: Plug-and-play stereo headset with mic for VoIP calls and conferencing. IC Role / Device Role / Timing Role: Audio codec handling bidirectional 16-bit PCM streams over USB; SpAct™ ensures low-jitter playback timing. Use Value: Eliminates need for separate USB controller and audio processing ICs-reduces BOM count and PCB area. |
Use Scenario: Desktop audio hub connecting analog mics/speakers and digital S/PDIF sources to PC. IC Role / Device Role / Timing Role: Dual-role codec with S/PDIF I/O and HID volume/mute buttons; manages independent sample clocks for record/playback. Use Value: Single-chip solution supports analog-to-digital conversion, digital-to-analog conversion, and S/PDIF bridging-no external clock synthesis required. |
| USB Monitor Audio | USB Speaker System |
Use Scenario: Flat-panel monitor with built-in speakers and mic input for video conferencing. IC Role / Device Role / Timing Role: Stereo DAC driving line-level speakers; ADC captures mic input; SSPND pin coordinates system suspend/resume. Use Value: Integrated analog filters and single 3.3-V supply simplify power and signal conditioning-ideal for space-constrained monitor PCBs. |
Use Scenario: Compact powered speaker with USB input and front-panel volume control. IC Role / Device Role / Timing Role: High-SNR DAC (96 dB) delivering clean audio output; HID0–HID2 detect physical button presses for host-reported volume/mute. Use Value: On-chip digital volume attenuation (0 to –64 dB in 1-dB steps) removes need for external digital potentiometers or microcontroller-based control. |
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 | No S/PDIF I/O; identical pinout and USB/audio functionality otherwise | Not suitable where digital audio passthrough or external DAC integration is required | Select PCM2901E only when S/PDIF is unnecessary and cost minimization is critical |
| CY7C66113-BZXI | USB 2.0 device controller + configurable GPIO; no integrated ADC/DAC or audio filters | Requires external audio converters and clocking; higher design complexity and component count | Choose only if custom audio processing or non-standard USB class implementation is needed |
Compared with PCM2901E, PCM2903E adds S/PDIF transceivers without changing footprint or power requirements; compared with CY7C66113-BZXI, it delivers complete audio signal chain integration-reducing development time, layout risk, and total system cost.
Availability
PCM2903E is available at Aetrix Electronics and suitable for USB headset, USB audio interface box, and USB monitor audio applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for PCM2903E 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 company specializing in analog, embedded processing, and connectivity technologies, with leadership in precision signal chain and power management solutions.
The PCM290x product line was designed specifically for cost-sensitive, space-constrained USB audio peripherals-delivering full-featured stereo codec functionality in a single SSOP-28 IC with zero firmware dependency.
FAQ
What distinguishes PCM2903E from PCM2901E?
The PCM2903E includes dedicated S/PDIF input (DIN) and output (DOUT) terminals not present on PCM2901E, enabling digital audio I/O without external transceivers. All other pinout, power, USB, and analog specifications-including ADC/DAC performance, SpAct™ clock recovery, and HID control-are identical between the two parts. PCM2903E maintains full pin compatibility with PCM2901E.
Does PCM2903E require external firmware or drivers?
No. The PCM2903E implements a fully compliant USB 1.1 full-speed audio class device with built-in protocol controller. It operates as a standard USB audio device under Windows, macOS, and Linux without custom drivers. HID volume/mute controls are natively recognized by the OS, and audio streaming uses standard isochronous endpoints defined in the USB audio class specification.
What is the role of the SpAct™ architecture in PCM2903E?
SpAct™ is Texas Instruments' proprietary clock recovery system that extracts precise audio sampling clocks directly from USB packet timing data. In PCM2903E, this eliminates the need for external crystal oscillators or PLLs for audio synchronization, reduces jitter in both playback and record paths, and enables independent sampling rates-critical for glitch-free bidirectional USB audio.
Can PCM2903E operate from USB bus power alone?
Yes. PCM2903E is self-powered: it draws operating current from the USB VBUS line (Pin 3), which must be connected to VDD (Pin 27). No external power supply is required. In suspend mode, it draws only 210 µA, meeting USB suspend current limits. Decoupling capacitors on all supply pins (VCCC, VCCP1, VCCP2, VCCX, VDD) are mandatory per datasheet guidelines.
How are HID control signals (HID0–HID2) implemented in PCM2903E?
HID0 (mute), HID1 (volume up), and HID2 (volume down) are 3.3-V CMOS inputs with internal pulldowns. They connect directly to mechanical switches or logic outputs and report state changes to the host PC via USB HID class endpoint. These signals are entirely independent of the ADC/DAC data path-no audio signal routing or processing occurs through them.
PCM2903E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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:
- 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 FAQ
1.How can I place an order for PCM2903E through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2903E 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 reliable?
The price and inventory of PCM2903E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2903E is usually 5 days.
3.What payment methods are accepted for PCM2903E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2903E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2903E?
PCM2903E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2903E 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?
For technical support, including PCM2903E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2903E requirements.
6.How does Aetrix verify that PCM2903E is sourced from the original manufacturer or authorized distributors?
All PCM2903E 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 meets industry standards.
7.What is the process for return or replacement of PCM2903E?
All PCM2903E units undergo pre-shipment inspection (PSI). If there is an issue with PCM2903E, 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 part is unused and in its original packaging.
Return procedure for PCM2903E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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