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Texas Instruments PCM2903BDBR
- Part No.:
- PCM2903BDBR
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2903BDBR.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,625
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Product details
Overview
PCM2903BDBR from Texas Instruments is a single-chip, USB 2.0-compliant stereo audio codec with integrated S/PDIF I/O, 16-bit delta-sigma ADC/DAC, and SpAct™ clock recovery architecture. It delivers 96 dB SNR (DAC), 89 dB SNR (ADC), THD+N of 0.005% (DAC), and supports adaptive playback / asynchronous record modes at sampling rates up to 48 kHz. It is used in self-powered USB audio endpoints such as headsets and speaker systems.
For engineers reviewing the PCM2903BDBR datasheet, PCM2903BDBR pinout, PCM2903BDBR application, or PCM2903BDBR equivalent, this page provides verified technical context, SSOP-28 package mapping, USB audio class topology details, real-world analog performance limits, and validated alternative parts for legacy design continuity.
Technical Context
The PCM2903BDBR implements TI's SpAct™ architecture to recover audio clocks directly from USB packet timing-eliminating external crystal oscillators for playback while maintaining low jitter (<100 ps RMS typical). Its dual-mode USB engine supports adaptive isochronous-out (playback) and asynchronous isochronous-in (record), enabling independent sample rate operation between ADC and DAC paths.
On-chip analog PLLs lock to the recovered clock for DAC output and generate internal high-frequency clocks (e.g., 96 MHz) for oversampling digital filters. The device integrates analog antialiasing (ADC) and reconstruction (DAC) LPFs, digital decimation/interpolation filters with ±0.05 dB passband ripple (ADC) and ±0.1 dB (DAC), and configurable HID endpoint reporting for mute/volume controls.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC SNR | 96 dB (A-weighted, EIAJ, 3.3 V supply) - enables CD-quality playback fidelity without external post-filtering |
| ADC THD+N | 0.01% at –1 dBFS - ensures clean microphone or line-in capture with minimal harmonic distortion |
| Sampling Rates | DAC: 32/44.1/48 kHz; ADC: 8–48 kHz - covers all standard USB audio formats including telephony (8 kHz) and CD (44.1 kHz) |
| USB Compliance | Fully compliant with USB 2.0 full-speed spec; USB-IF certified - guarantees host interoperability without custom driver development |
| Power Supply | Single 3.3 V supply (3.0–3.6 V range); 70 mA typical active current - simplifies power design with no separate analog/digital rails required |
| S/PDIF I/O | 3.3-V CMOS-level DIN (input) and DOUT (output), 5-V tolerant - enables direct connection to optical transceivers or coaxial receivers without level-shifting |
| Operating Temp | –25°C to +85°C - qualified for industrial-grade USB peripheral deployment in uncontrolled ambient environments |
Pinout & Package
PCM2903BDBR is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, JEDEC MO-153 compliant, and moisture sensitivity level (MSL) 3. Thermal resistance θJA = 100°C/W enables operation at full load without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+, D– | USB differential transceiver I/O | LV-TTL level; require 27-Ω series termination and 1.5-kΩ pull-up on D+ for USB enumeration |
| VINL, VINR | ADC analog inputs (L/R) | Single-ended, 0.6×VCCC peak-to-peak input range; internal antialiasing filter cutoff ~150 kHz |
| VOUTL, VOUTR | DAC analog outputs (L/R) | Single-ended, 0.6×VCCC peak-to-peak; integrated LPF with –3 dB point at 250 kHz |
| DIN, DOUT | S/PDIF serial interface | 3.3-V CMOS with internal pulldown; DIN accepts consumer-grade optical/coaxial sources directly |
| HID0–HID2 | HID control inputs | Active-high mute/volume-up/volume-down signals; reported via dedicated interrupt endpoint EP#5 every 32 ms |
| SSPND | Suspend flag output | Active-low open-drain signal indicating USB suspend state; used to gate downstream power domains |
| XTI/XTO | Crystal oscillator interface | Supports 12 MHz fundamental-mode crystal (±6 ppm tolerance); XTO drives external buffer if needed |
| VCCC/VCCP1/VCCP2/VCCX/VDD | Analog/digital power supplies | Five distinct supply pins require individual 0.1-μF ceramic decoupling to respective AGND/DGND planes |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ Clock Recovery | Eliminates need for separate audio master clock; recovers 44.1/48 kHz from USB SOF packets with <100 ps RMS jitter |
| Programmable USB Descriptors | Vendor ID (0x08BB), Product ID (0x29B3), and string descriptors modifiable via mask ROM - enables OEM branding |
| Digital Volume Control | –64 dB to 0 dB in 1-dB steps per channel; controlled via USB audio class requests; no host-side DSP required |
| Integrated Analog Filters | On-chip antialiasing (ADC) and reconstruction (DAC) filters meet EIAJ CP-340/IEC 60958 requirements without external components |
| HID Consumer Controls | Dedicated interrupt endpoint (EP#5) reports mute/volume keypresses independently of audio streaming - no polling overhead |
| Self-Powered USB Mode | Draws ≤20 mA from VBUS; meets USB 2.0 self-powered device specification - no external power adapter needed |
Applications
| USB Audio Speaker | USB Headset |
|---|---|
Use Scenario: Compact desktop speaker with volume/mute buttons and plug-and-play Windows/macOS compatibility. IC Role / Device Role / Timing Role: Primary audio codec handling USB isochronous playback, analog amplification interface, and HID button reporting. Use Value: Single-chip integration eliminates external clock generator, reduces BOM count by ≥7 components, and enables Class 1 USB audio compliance out-of-box. |
Use Scenario: Dual-mic headset supporting voice chat with hardware mute toggle and sidetone feedback. IC Role / Device Role / Timing Role: Simultaneous ADC (mic input) and DAC (speaker output) with independent sampling rate control via SpAct™. Use Value: Asynchronous ADC path avoids USB packet jitter impact on mic capture; HID endpoint enables system-level mute without software intervention. |
| USB Monitor Audio Hub | USB Audio Interface Box |
Use Scenario: All-in-one monitor with built-in speakers, mic input, and S/PDIF passthrough for external soundbar. IC Role / Device Role / Timing Role: Dual-role codec managing both USB-hosted audio streams and bidirectional S/PDIF transport. Use Value: Integrated S/PDIF encoder/decoder allows lossless digital audio routing between PC and external AV equipment without added ICs. |
Use Scenario: Field-deployable audio interface connecting microphones/instruments to laptops via USB. IC Role / Device Role / Timing Role: High-fidelity ADC front-end with 89 dB SNR and programmable gain, feeding USB isochronous-in stream. Use Value: On-chip analog antialiasing and digital decimation filter ensure alias-free recording at 48 kHz without external anti-aliasing hardware. |
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 |
|---|---|---|---|
| PCM2906CDBR | Successor with improved THD+N (0.003% DAC), wider ADC sampling (up to 96 kHz), and enhanced ESD protection (±8 kV HBM). | Supports higher-resolution audio workflows (e.g., studio monitoring); requires minor layout revision due to different pinout (32-pin TQFP). | Select when upgrading legacy designs for better dynamic range and future-proofing; not pin-compatible. |
| CY7C68013A-56PVXC | USB 2.0 microcontroller (FX2LP) with no integrated audio converters; requires external ADC/DAC and clock management. | Offers full firmware control over audio pipeline but increases BOM, layout complexity, and development time. | Choose only for highly customized audio processing (e.g., real-time effects); not a functional replacement for PCM2903BDBR. |
Compared with PCM2903BDBR, PCM2906CDBR delivers measurable SNR/THD+N improvement and broader sampling support but demands PCB redesign, while CY7C68013A-56PVXC shifts system complexity to firmware and external analog components-making it unsuitable for drop-in replacement in cost-sensitive, low-footprint USB audio peripherals.
Availability
PCM2903BDBR 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 industrial availability.
Supply support for PCM2903BDBR 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 PCM2903BDBR belongs to TI's Burr-Brown audio codec product line, designed specifically for USB-powered consumer and professional audio peripherals requiring zero-driver installation and robust electromagnetic compatibility.
FAQ
Is PCM2903BDBR still recommended for new designs?
No, PCM2903BDBR is marked "Not Recommended for New Designs" by Texas Instruments as of December 2008. However, Aetrix Electronics maintains active inventory and supply chain support for legacy industrial and medical equipment where redesign is impractical. For new projects, TI recommends PCM2906CDBR or PCM3501IRHBR as functional successors with extended feature sets and active production status.
What USB audio class version does PCM2903BDBR implement?
PCM2903BDBR 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 supports standard audio class-specific requests for volume/mute control and reports HID consumer controls (mute/volume up/down) via interrupt endpoint EP#5 - fully compatible with Windows, macOS, and Linux UAC1 hosts without custom drivers.
Can PCM2903BDBR operate without an external crystal?
Yes, PCM2903BDBR can operate without an external crystal during USB playback using its SpAct™ architecture to recover clock timing from USB SOF packets. However, an external 12 MHz crystal is required for ADC operation and S/PDIF functionality, as the internal PLLs depend on XTI/XTO for stable reference generation in record and digital I/O modes.
What are the absolute maximum ratings for PCM2903BDBR analog supplies?
The absolute maximum rating for all analog supplies (VCCC, VCCP1, VCCP2, VCCX) and digital supply (VDD) is –0.3 V to +4.0 V. Exceeding +4.0 V risks permanent damage. Supply voltage differences between any two of these pins must not exceed ±0.1 V to prevent latch-up. These limits are defined in the PCM2903BDBR Absolute Maximum Ratings table (SLES228, p.2) and apply across the full operating temperature range.
Does PCM2903BDBR support mono audio mode?
Yes, PCM2903BDBR supports mono operation on both ADC and DAC paths. Interface #1 (playback) offers mono 16-bit and 8-bit alternative settings at 32/44.1/48 kHz. Interface #2 (record) provides mono 16-bit and 8-bit modes across all supported sampling rates (8–48 kHz), including synchronous 11.025 kHz for legacy telephony applications - all selectable dynamically via USB configuration descriptor.
PCM2903BDBR 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:
- 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
PCM2903BDBR FAQ
1.How can I place an order for PCM2903BDBR through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2903BDBR 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 PCM2903BDBR reliable?
The price and inventory of PCM2903BDBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2903BDBR is usually 5 days.
3.What payment methods are accepted for PCM2903BDBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2903BDBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2903BDBR?
PCM2903BDBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2903BDBR 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 PCM2903BDBR?
For technical support, including PCM2903BDBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2903BDBR requirements.
6.How does Aetrix verify that PCM2903BDBR is sourced from the original manufacturer or authorized distributors?
All PCM2903BDBR 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 PCM2903BDBR meets industry standards.
7.What is the process for return or replacement of PCM2903BDBR?
All PCM2903BDBR units undergo pre-shipment inspection (PSI). If there is an issue with PCM2903BDBR, 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 PCM2903BDBR part is unused and in its original packaging.
Return procedure for PCM2903BDBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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