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Texas Instruments PCM2903BDB
- Part No.:
- PCM2903BDB
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2903BDB.pdf
- Description:
- IC STEREO CODEC 8/16B USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,811
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Product details
Overview
PCM2903BDB 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 I/O, and SpAct™ clock recovery architecture. It delivers THD+N = 0.005% (DAC), SNR = 96 dB (DAC), and supports adaptive playback / asynchronous record modes at sampling rates up to 48 kHz. It targets USB audio endpoints requiring self-powered, single-supply (3.3 V) operation with HID control.
For engineers reviewing the PCM2903BDB datasheet, PCM2903BDB pinout, PCM2903BDB application, or PCM2903BDB equivalent, this page provides verified technical context, package mapping, real-world use scenarios, and validated alternative options for legacy USB audio system design and maintenance.
Technical Context
The PCM2903BDB implements TI's SpAct™ architecture to recover low-jitter audio clocks directly from USB packet timing-enabling independent DAC and ADC sampling rates without external crystal oscillators beyond the required 12-MHz reference. Its USB protocol controller operates fully autonomously with no firmware required.
It integrates four USB interfaces: Control (IF #0), isochronous-out streaming (IF #1), isochronous-in streaming (IF #2), and HID interrupt (IF #3). Audio data paths include on-chip analog LPF (DAC), antialiasing filter (ADC), digital HPF (ADC), and programmable decimation/interpolation filters with ±0.05 dB passband ripple (ADC) and ±0.1 dB (DAC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC SNR | 96 dB (EIAJ, A-weighted) - enables high-fidelity playback in consumer-grade USB speakers/headsets |
| DAC THD+N | 0.005% at 0 dBFS - ensures clean output with minimal harmonic distortion under nominal load |
| ADC Dynamic Range | 89 dB (A-weighted) - supports clear voice capture in headset/mic applications with >80 dB channel separation |
| Sampling Rates | DAC: 32/44.1/48 kHz (adaptive); ADC: 8–48 kHz (asynchronous/synchronous) - covers CD, VoIP, and broadcast audio standards |
| USB Compliance | Fully compliant with USB 2.0 specification and certified by USB-IF - guarantees host interoperability without custom drivers |
| Power Supply | Single 3.3 V supply (VDD/VCCC/VCCP1/VCCP2/VCCX = 3.0–3.6 V) - simplifies PCB power design and reduces BOM count |
| Suspend Current | 250 µA - enables low-power USB suspend mode for energy-efficient portable devices |
Pinout & Package
PCM2903BDB is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, optimized for compact USB audio peripheral layouts and compatible with standard reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+, D– | USB differential transceiver I/O | LV-TTL level; connect directly to USB upstream port per USB 2.0 full-speed routing rules |
| VINL, VINR | ADC analog input (L/R) | Single-ended voltage inputs referenced to VCOM (VCCC/2); require AC-coupled signal conditioning |
| VOUTL, VOUTR | DAC analog output (L/R) | Single-ended voltage outputs; drive 10 kΩ loads with 0.6 VPP swing and integrated LPF |
| DIN, DOUT | S/PDIF serial I/O | 3.3-V CMOS-level, 5-V tolerant; support optical/coaxial digital audio interfacing |
| HID0–HID2 | HID key state inputs | Active-high mute/volume-up/volume-down signals; report via dedicated HID endpoint (EP #5) |
| SSPND | Suspend flag output | Active-low open-drain signal indicating USB suspend state; used for system power management |
| XTI/XTO | Crystal oscillator interface | Supports 12.000 MHz ±6 ppm crystal; internal oscillator circuit eliminates need for external PLL components |
| VCCC, VCCP1, VCCP2, VCCX, VDD | Analog/digital power domains | Five separate supply pins require individual 0.1 µF decoupling to respective ground planes (AGNDC/AGNDP/AGNDX/DGND/DGNDU) |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ Clock Recovery | Eliminates master clock jitter sensitivity by deriving audio sample clocks directly from USB packet timing-no external PLL needed |
| Programmable USB Descriptors | Vendor ID (0x08BB) and Product ID (0x29B3) can be modified per customer request-enables OEM branding and driver differentiation |
| Integrated Analog Filters | On-chip antialiasing (ADC) and low-pass (DAC) filters meet EIAJ/IEC-60958 requirements-reduces external passive component count |
| HID Consumer Controls | Dedicated HID endpoint reports mute/volume keys independently of audio streams-allows host OS to handle controls without audio path interruption |
| Self-Powered USB Operation | Draws <20 mA from VBUS; meets USB 2.0 self-powered device class-no external power adapter required for bus-powered designs |
Applications
| USB Audio Speaker | USB Headset |
|---|---|
|
Use Scenario: Compact desktop speaker with volume/mute buttons and plug-and-play USB connectivity. IC Role / Device Role: Primary audio codec handling USB-to-analog conversion, S/PDIF passthrough, and HID key reporting. Use Value: Single-chip integration eliminates separate USB controller, DAC, and HID logic-reducing BOM cost and board area by >40% vs discrete solution. |
Use Scenario: Dual-mic mono headset for VoIP conferencing with hardware mute toggle. IC Role / Device Role: Stereo ADC captures mic signals; DAC drives earpiece; HID0 reports mute status to OS. Use Value: Asynchronous ADC sampling (44.1 kHz) and adaptive DAC playback ensure synchronized, low-latency audio without host clock dependency. |
| USB Monitor Audio Hub | USB Audio Interface Box |
|
Use Scenario: All-in-one monitor with built-in speakers, mic input, and headphone jack. IC Role / Device Role: Central audio hub managing bidirectional streaming, S/PDIF output to external DAC, and volume control via HID. Use Value: Simultaneous 48 kHz DAC playback + 44.1 kHz ADC recording enables full-duplex operation-critical for video conferencing UX. |
Use Scenario: External audio interface connecting microphones/instruments to PC for recording. IC Role / Device Role: High-fidelity ADC front-end with 89 dB dynamic range and digital HPF for DC offset suppression. Use Value: Integrated antialiasing filter and ±1% gain mismatch enable clean 16-bit capture without external op-amp anti-alias stages. |
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 |
|---|---|---|---|
| PCM2906CDB | Successor with improved THD+N (0.003% DAC), extended temperature range (–40°C to +85°C), and updated USB descriptors; same 28-pin SSOP footprint | Supports industrial ambient conditions and tighter audio fidelity specs; requires minor firmware descriptor update | Select when new designs require extended temp rating or lower distortion; not drop-in due to revised HID report descriptor layout |
| CY7C66113-BZXI | USB 2.0 microcontroller with configurable audio endpoints; requires external ADC/DAC; no integrated SpAct or analog filters | Offers full firmware control over USB audio class behavior but increases BOM, layout complexity, and development time | Choose only if custom HID behavior, multi-channel expansion, or non-standard sampling rates are mandatory |
Compared with PCM2903BDB, PCM2906CDB delivers measurable SNR/THD+N improvement and broader operating temperature, while CY7C66113-BZXI trades integration for flexibility-making PCM2903BDB optimal for cost-sensitive, fixed-function USB audio peripherals where proven reliability matters most.
Availability
PCM2903BDB is available at Aetrix Electronics and suitable for USB audio speaker, USB headset, and USB monitor audio hub applications requiring stable component supply and long-term legacy support.
Supply support for PCM2903BDB 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 solutions with over 50 years of innovation in precision signal chain components.
The PCM2903BDB belongs to TI's Burr-Brown audio codec product line, engineered specifically for USB-audio-peripheral integration-emphasizing plug-and-play compatibility, low-jitter clocking, and minimal external component count.
FAQ
Is PCM2903BDB still recommended for new designs?
No. Texas Instruments explicitly marks PCM2903BDB as "Not Recommended for New Designs" in its official documentation. While fully functional and supported for existing production, new projects should evaluate successors like PCM2906CDB for enhanced specs and extended lifecycle. PCM2903BDB remains viable for maintenance, repair, and legacy system refreshes where qualification timelines prohibit redesign.
What USB audio class compliance does PCM2903BDB support?
PCM2903BDB implements USB Audio Class 1.0 (UAC1) with four interfaces: control (IF #0), isochronous-out (IF #1), isochronous-in (IF #2), and HID (IF #3). It uses standard descriptors certified by USB-IF and requires no custom drivers on Windows/macOS/Linux-enabling true plug-and-play operation for stereo playback and recording.
Does PCM2903BDB require an external crystal oscillator?
Yes. PCM2903BDB requires a 12.000 MHz ±6 ppm fundamental-mode crystal connected between XTI (pin 21) and XTO (pin 20). The internal oscillator circuit drives the PLLs for SpAct™ clock recovery and USB timing-no external PLL or clock generator is needed, but the crystal must meet specified load capacitance and stability.
Can PCM2903BDB operate with different sampling rates for ADC and DAC simultaneously?
Yes. PCM2903BDB supports independent sampling-DAC uses USB adaptive mode (32/44.1/48 kHz), while ADC uses asynchronous mode (8–48 kHz). This allows simultaneous playback at 48 kHz and recording at 44.1 kHz, essential for professional audio monitoring and conferencing applications without resampling artifacts.
How is HID functionality implemented on PCM2903BDB?
HID functionality on PCM2903BDB is implemented via three dedicated CMOS inputs (HID0/HID1/HID2) tied to physical buttons and reported through a separate interrupt endpoint (EP #5). These pins map to standard USB HID consumer usage codes (mute: 0xE209, volume up: 0xE909, volume down: 0xEA09)-enabling OS-level control without interfering with audio streaming endpoints.
PCM2903BDB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
PCM2903BDB FAQ
1.How can I place an order for PCM2903BDB through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2903BDB 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 PCM2903BDB reliable?
The price and inventory of PCM2903BDB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2903BDB is usually 5 days.
3.What payment methods are accepted for PCM2903BDB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2903BDB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2903BDB?
PCM2903BDB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2903BDB 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 PCM2903BDB?
For technical support, including PCM2903BDB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2903BDB requirements.
6.How does Aetrix verify that PCM2903BDB is sourced from the original manufacturer or authorized distributors?
All PCM2903BDB 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 PCM2903BDB meets industry standards.
7.What is the process for return or replacement of PCM2903BDB?
All PCM2903BDB units undergo pre-shipment inspection (PSI). If there is an issue with PCM2903BDB, 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 PCM2903BDB part is unused and in its original packaging.
Return procedure for PCM2903BDB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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