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Texas Instruments PCM2906BDBR
- Part No.:
- PCM2906BDBR
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2906BDBR.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,301
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Product details
Overview
PCM2906BDBR from Texas Instruments is a single-chip, USB-compliant stereo audio codec with integrated full-speed USB protocol controller, 16-bit delta-sigma ADC/DAC, S/PDIF I/O, and on-chip SpAct™ clock recovery. It delivers THD+N = 0.005% (DAC) and SNR = 96 dB at 44.1 kHz, operating from a single 5-V VBUS supply in 28-pin SSOP packaging. It enables plug-and-play USB audio endpoints such as headsets and speaker systems without host-side firmware.
For engineers reviewing the PCM2906BDBR datasheet, PCM2906BDBR pinout, PCM2906BDBR application, or PCM2906BDBR equivalent, this page provides verified technical context, validated pin functions, real-world audio interface use cases, and confirmed alternative parts for USB audio system design and legacy component replacement.
Technical Context
The PCM2906BDBR implements TI's SpAct™ architecture to recover low-jitter audio clocks directly from USB packet timing-enabling independent asynchronous ADC and DAC sampling (e.g., 44.1 kHz record + 48 kHz playback). Its dual-path digital filter architecture includes decimation (ADC) with ±0.05 dB passband ripple and interpolation (DAC) with ±0.1 dB ripple, both featuring >65 dB stop-band attenuation.
It integrates four USB interfaces: IF#0 (audio control), IF#1 (isochronous-out streaming), IF#2 (isochronous-in streaming), and IF#3 (HID for mute/volume keys). All USB descriptors-including VID/PID and string fields-are partially mask-programmable per TI specification, supporting OEM branding without custom firmware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC Resolution | 16-bit delta-sigma; supports 32/44.1/48 kHz playback with adaptive or asynchronous USB mode |
| ADC Resolution | 16-bit delta-sigma; supports 8–48 kHz sampling across 7 rates including 11.025 and 22.05 kHz |
| Analog Performance (DAC) | THD+N = 0.005%, SNR = 96 dB, dynamic range = 93 dB (A-weighted, VBUS = 5 V, 44.1 kHz) |
| Analog Performance (ADC) | THD+N = 0.01%, SNR = 89 dB, dynamic range = 89 dB (A-weighted, VBUS = 5 V, 44.1 kHz) |
| USB Compliance | Fully compliant with USB 2.0 full-speed spec; USB-IF certified; bus-powered (≤500 mA) |
| S/PDIF Interface | 3.3-V CMOS-level DIN input (5-V tolerant) and DOUT output; supports coaxial or optical audio transport |
| Supply & Power | Single 4.35–5.25 V VBUS supply; 67 mA typical operational current; 250 µA suspend mode |
| Package | 28-pin SSOP (DB package); –25°C to +85°C operating temperature range |
Pinout & Package
PCM2906BDBR is housed in a 28-pin SSOP (DB) package with 0.65 mm lead pitch and exposed thermal pad not connected internally. Pin functions are validated per TI SLES227 datasheet Rev. December 2008.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+, D– | USB differential transceiver I/O | LV-TTL level; connect directly to USB upstream port; require 27-Ω series termination per TI layout guidelines |
| VINL, VINR | ADC analog inputs | Single-ended voltage inputs referenced to VCOM; support 0.6×VCCCI peak-to-peak swing |
| VOUTL, VOUTR | DAC analog outputs | Single-ended voltage outputs; DC-coupled to VCOM; drive 10-kΩ AC-coupled loads |
| DIN, DOUT | S/PDIF serial interface | 3.3-V CMOS I/O; DIN has internal pulldown; both tolerate 5-V logic; enable digital audio passthrough |
| HID0–HID2 | HID key inputs | Active-high mute/volume-up/volume-down signals; report to host via HID interface without ADC/DAC involvement |
| SSPND | Suspend flag output | Active-low open-drain signal indicating USB suspend state; used for power gating external circuitry |
| XTI, XTO | Crystal oscillator terminals | Support 12 MHz ±6 ppm crystal; internal oscillator drives PLLs for SpAct™ clock recovery and audio clocks |
| VCCCI, VCCP1I, VCCP2I, VCCXI, VDDI | Internal power domains | Five dedicated supply pins requiring individual 0.1-µF decoupling to respective AGND/DGND planes |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ Clock Recovery | Eliminates need for external crystal or PLL IC; recovers low-jitter audio clocks directly from USB isochronous packets |
| Programmable USB Descriptors | Vendor ID, Product ID, and string descriptors modifiable via TI mask option-enables OEM branding without firmware changes |
| Integrated Analog Filters | On-chip antialiasing (ADC) and low-pass (DAC) filters with –3 dB points at 150 kHz and 250 kHz respectively |
| HID Function Support | Dedicated mute/volume-up/volume-down inputs mapped to standard USB HID class-no driver customization required |
| S/PDIF Transceiver | Full-duplex S/PDIF I/O enables digital audio loopback, format conversion, or external DAC/ADC interfacing |
| Bus-Powered Operation | Draws ≤500 mA from VBUS; meets USB 2.0 power budget; includes suspend-mode current reduction to 250 µA |
Applications
| USB Headset | USB Audio Interface Box |
|---|---|
|
Use Scenario: Compact wired headset with microphone and stereo playback, connecting directly to PC or laptop via USB Type-A. IC Role / Device Role / Timing Role: PCM2906BDBR serves as the sole audio codec-handling bidirectional 16-bit/48 kHz streams, HID volume/mute, and S/PDIF passthrough for digital mic input. Use Value: Eliminates separate USB controller and audio codec ICs; reduces BOM count by ≥3 components while maintaining <0.01% THD+N performance. |
Use Scenario: External audio adapter converting analog line-in/line-out to USB for legacy equipment integration. IC Role / Device Role / Timing Role: PCM2906BDBR acts as bridge between analog audio jacks and USB host, managing independent ADC/DAC sample rates and S/PDIF sync. Use Value: Enables asynchronous sample rate conversion (e.g., 44.1 kHz mic → 48 kHz USB stream), avoiding dropouts during host clock drift. |
| USB Monitor | USB Speaker |
|
Use Scenario: All-in-one monitor with built-in speakers and microphone array, using single USB-C or USB-A for video + audio + HID. IC Role / Device Role / Timing Role: PCM2906BDBR handles stereo playback, mono recording, and HID controls-coordinated via four USB interfaces under one device descriptor. Use Value: Supports simultaneous isochronous IN/OUT endpoints plus HID and control interfaces-reducing USB enumeration complexity vs. multi-chip solutions. |
Use Scenario: Powered desktop speaker system accepting USB audio input and providing analog line-out to subwoofer or headphones. IC Role / Device Role / Timing Role: PCM2906BDBR operates as USB audio sink-converting incoming isochronous data to analog L/R outputs with integrated LPF and volume control. Use Value: Delivers 96 dB SNR and <0.005% THD+N without external op-amps or regulators-meeting premium consumer audio specifications. |
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 |
|---|---|---|---|
| PCM2902CDBR | Legacy TI part; identical 28-pin SSOP package but lacks S/PDIF I/O and SpAct™; supports only 44.1/48 kHz ADC/DAC | Not suitable for S/PDIF passthrough or asynchronous dual-rate operation; limited to basic USB speaker/headset designs | Select only if S/PDIF and independent sample rate support are unnecessary and cost is primary constraint |
| CY7C66113-BZXI | Cypress (now Infineon) USB audio controller; requires external ADC/DAC; no integrated analog front-end or S/PDIF | Demands additional signal chain components (op-amps, filters, converters); increases PCB area and BOM cost | Choose when flexible topology (e.g., high-resolution external DAC) outweighs integration benefits of PCM2906BDBR |
Compared with PCM2906BDBR, PCM2902CDBR offers lower integration and reduced feature set, while CY7C66113-BZXI shifts analog design burden to external components-making PCM2906BDBR the optimal choice for compact, self-contained USB audio endpoints requiring S/PDIF and jitter-resilient clocking.
Availability
PCM2906BDBR is available at Aetrix Electronics and suitable for USB audio endpoint development, legacy audio system upgrades, and industrial human-interface audio modules requiring stable component supply and long-term lifecycle support.
Supply support for PCM2906BDBR 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 PCM2906BDBR belongs to TI's Burr-Brown audio codec product line, designed specifically for USB-audio-class-compliant, bus-powered stereo interfaces requiring minimal external components and robust electromagnetic compatibility.
FAQ
Is PCM2906BDBR still recommended for new designs?
No, PCM2906BDBR is marked "Not Recommended for New Designs" in its official TI datasheet (SLES227, December 2008). While fully functional and supported for existing production, TI advises evaluating newer alternatives like the PCM2912A or PCM2900C series for new projects due to enhanced USB compliance, lower power, and extended lifecycle assurance. PCM2906BDBR remains available through Aetrix Electronics for legacy continuity.
What USB audio class does PCM2906BDBR implement?
PCM2906BDBR implements USB Audio Class 1.0 (UAC1) with four interfaces: IF#0 (standard audio control), IF#1 (isochronous-out), IF#2 (isochronous-in), and IF#3 (HID). It uses class-specific requests for volume/mute control and supports Windows, macOS, and Linux native drivers without custom INF files-verified per TI's USB-IF certification documentation for PCM2906BDBR.
Does PCM2906BDBR support asynchronous USB audio mode for both ADC and DAC?
Yes, PCM2906BDBR supports USB asynchronous mode for ADC (record) and adaptive mode for DAC (playback), enabled by its SpAct™ architecture. This allows independent sampling-e.g., recording at 44.1 kHz while playing back at 48 kHz-without shared clock constraints. The datasheet confirms this capability in Section "USB Adaptive Mode for Playback" and "USB Asynchronous Mode for Record" for PCM2906BDBR.
Can the USB vendor and product IDs of PCM2906BDBR be customized?
Yes, PCM2906BDBR supports partial descriptor programmability: Vendor ID (default 0x08BB), Product ID (default 0x29B6), and string descriptors (e.g., "Burr-Brown from TI", "USB Audio CODEC") can be modified via TI's mask option process. This customization requires coordination with TI prior to wafer fabrication and is documented in the "Device Descriptor" table of the PCM2906BDBR datasheet.
What is the function of the SSPND pin on PCM2906BDBR?
The SSPND pin (Pin 28) is an active-low suspend flag output that asserts low during USB suspend state and returns high during active operation. It is an open-drain signal intended to control external power management-such as disabling analog amplifiers or switching off LDOs-to reduce system-level standby current. Its behavior is explicitly defined in Table 1 ("Terminal Functions") of the PCM2906BDBR datasheet.
PCM2906BDBR 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 / 93
- 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
PCM2906BDBR FAQ
1.How can I place an order for PCM2906BDBR through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2906BDBR 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 PCM2906BDBR reliable?
The price and inventory of PCM2906BDBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2906BDBR is usually 5 days.
3.What payment methods are accepted for PCM2906BDBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2906BDBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2906BDBR?
PCM2906BDBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2906BDBR 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 PCM2906BDBR?
For technical support, including PCM2906BDBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2906BDBR requirements.
6.How does Aetrix verify that PCM2906BDBR is sourced from the original manufacturer or authorized distributors?
All PCM2906BDBR 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 PCM2906BDBR meets industry standards.
7.What is the process for return or replacement of PCM2906BDBR?
All PCM2906BDBR units undergo pre-shipment inspection (PSI). If there is an issue with PCM2906BDBR, 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 PCM2906BDBR part is unused and in its original packaging.
Return procedure for PCM2906BDBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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