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Texas Instruments PCM2906BDB
- Part No.:
- PCM2906BDB
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2906BDB.pdf
- Description:
- IC STEREO CODEC 16B USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,944
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Product details
Overview
PCM2906BDB from Texas Instruments is a single-chip, USB 2.0–compliant stereo audio codec with integrated full-speed USB transceiver, 16-bit delta-sigma ADC/DAC, S/PDIF I/O, and on-chip SpAct™ clock recovery. It delivers THD+N = 0.005% (DAC) and 0.01% (ADC) at 44.1 kHz, 96 dB SNR (DAC), and operates from a single 5-V VBUS supply in 28-pin SSOP packaging. It serves as the core audio interface in USB speaker and headset designs.
For engineers reviewing the PCM2906BDB datasheet, PCM2906BDB pinout, PCM2906BDB application, or PCM2906BDB equivalent, this page provides verified functional role, validated USB audio topology, confirmed analog performance at 5 V, real-world S/PDIF timing behavior, and precise SpAct™ jitter-reduction architecture - all directly extracted from TI's SLES227 datasheet.
Technical Context
The PCM2906BDB implements a dual-path USB audio architecture: asynchronous mode for ADC recording (USB packet-driven clock recovery via SpAct™) and adaptive mode for DAC playback (host-synchronized timing). Its analog front-end integrates antialiasing (ADC) and low-pass (DAC) filters, plus digital high-pass filtering for DC offset suppression.
It embeds four USB interfaces - control (IF #0), stereo/mono playback (IF #1), stereo/mono record (IF #2), and HID (IF #3) - supporting volume/mute control and suspend flag signaling. All USB descriptors (VID/PID/vendor/product strings) are partially programmable per TI specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC Resolution | 16-bit delta-sigma; supports 32/44.1/48 kHz playback with ±0.1 dB passband ripple and –43 dB stop-band attenuation. |
| ADC Resolution | 16-bit delta-sigma; supports 8–48 kHz sampling (including 11.025/22.05 kHz) with ±0.05 dB passband ripple and –65 dB stop-band attenuation. |
| Analog Performance | DAC: THD+N = 0.005%, SNR = 96 dB, dynamic range = 93 dB; ADC: THD+N = 0.01%, SNR = 89 dB, dynamic range = 89 dB (VBUS = 5 V). |
| USB Compliance | Fully compliant with USB 2.0 full-speed spec; certified by USB-IF; bus-powered (500 mA max); no external firmware required. |
| S/PDIF Interface | 3.3-V CMOS-level DIN (input, 5-V tolerant) and DOUT (output); supports consumer-grade digital audio I/O without external transceiver. |
| Power & Package | Single 5-V supply (4.35–5.25 V); 28-pin SSOP (DB package); operating temperature: –25°C to +85°C; thermal resistance θJA = 100°C/W. |
| Human Interface | HID inputs (HID0–HID2) support mute/volume-up/volume-down key reporting; SSPND pin outputs active-low suspend status. |
Pinout & Package
PCM2906BDB is housed in a 28-pin SSOP (DB) package with 0.65-mm lead pitch, designed for surface-mount assembly and thermal dissipation in compact audio peripherals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+, D– | USB differential I/O | LV-TTL level; connect directly to USB upstream port; enable full-speed (12 Mbps) isochronous audio streaming. |
| VINL, VINR | ADC analog inputs | Single-ended voltage inputs (0.6 × VCCCI peak-to-peak); include on-chip antialiasing filter and digital HPF. |
| VOUTL, VOUTR | DAC analog outputs | Single-ended voltage outputs (0.6 × VCCCI peak-to-peak); include on-chip analog LPF and oversampling digital filter. |
| DIN, DOUT | S/PDIF digital I/O | 3.3-V CMOS-level; DIN has internal pulldown and 5-V tolerance; enables direct connection to optical/coaxial digital audio sources/sinks. |
| HID0–HID2 | HID key inputs | Active-high CMOS inputs; report mute/volume up/down states to host OS without requiring custom driver logic. |
| SSPND | Suspend flag output | Active-low open-drain signal; asserts low during USB suspend state to enable system-level power management. |
| XTI, XTO | Crystal oscillator interface | Supports 12-MHz ±6 ppm crystal (11.994–12.006 MHz); enables on-chip PLL generation of 96-MHz clock for SpAct™ timing recovery. |
| VCCCI, VCCP1I, VCCP2I, VCCXI, VDDI | Internal power domains | Five isolated analog/digital supplies; each requires local 0.1-µF decoupling to respective AGND/DGND planes to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ Clock Recovery | Eliminates need for external crystal on host side; recovers low-jitter audio clock directly from USB packet data for independent ADC/DAC sampling. |
| Integrated USB Audio Stack | Zero-firmware operation: preconfigured USB descriptors, four-interface topology (control/audio-in/audio-out/HID), and class-compliant enumeration. |
| Programmable Descriptors | Vendor ID (0x08BB), Product ID (0x29B6), vendor/product strings, and max-power value can be modified per TI request for OEM branding. |
| On-Chip Analog Filters | ADC includes antialiasing LPF (–3 dB at 150 kHz); DAC includes reconstruction LPF (–3 dB at 250 kHz); both meet EIAJ/IEC-60958 requirements. |
| Dual-Mode USB Audio | Adaptive mode for playback (host-timed), asynchronous mode for recording (device-timed); enables simultaneous bidirectional streaming without clock drift. |
Applications
| USB Audio Speaker | USB Headset |
|---|---|
Use Scenario: Desktop or conference room speaker with plug-and-play USB connectivity and hardware volume/mute controls. IC Role / Device Role / Timing Role: Primary audio codec handling USB isochronous playback, DAC conversion, analog amplification interface, and HID key reporting. Use Value: Eliminates need for separate USB controller and audio processor; SpAct™ ensures stable playback timing without host clock dependency. |
Use Scenario: Dual-mode headset supporting voice call (mic + speaker) and media playback over single USB cable. IC Role / Device Role / Timing Role: Simultaneous stereo ADC (mic input) and DAC (speaker output) with independent sampling clocks via SpAct™. Use Value: Enables true full-duplex operation at mismatched rates (e.g., 44.1 kHz playback + 16 kHz recording) without buffer underrun/overflow. |
| 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 connecting to AV receivers. IC Role / Device Role / Timing Role: Central audio hub managing USB host interface, analog I/O, and S/PDIF digital I/O with shared clock domain. Use Value: Single-chip solution reduces BOM count and PCB area; S/PDIF I/O allows lossless digital audio routing without re-encoding. |
Use Scenario: Compact external audio adapter for laptops lacking 3.5-mm jacks, supporting mic, line-out, and optical output. IC Role / Device Role / Timing Role: Bridge between USB host and legacy analog/digital audio endpoints; handles sample rate negotiation and format translation. Use Value: Supports 8–48 kHz sampling across all modes; programmable descriptors allow seamless integration into branded peripheral ecosystems. |
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 |
|---|---|---|---|
| PCM2902CDB | Legacy 24-pin SSOP variant; lacks S/PDIF I/O, HID inputs, and SSPND; supports only 44.1/48 kHz ADC/DAC; lower SNR (90 dB DAC). | Targeted at cost-sensitive USB speaker-only designs without digital I/O or system control needs. | Select PCM2902CDB only if S/PDIF, HID, suspend signaling, and 32 kHz/8 kHz sampling are unnecessary. |
| PCM2900E DB | Pin-compatible 28-pin SSOP; identical USB/S/PDIF/HID functionality; but rated for –40°C to +85°C industrial temp range and higher THD+N (0.012% DAC). | Suitable for extended-temperature environments where PCM2906BDB's –25°C min rating is insufficient. | Choose PCM2900E DB when industrial temperature compliance or marginally relaxed audio specs are acceptable trade-offs for wider ambient range. |
Compared with PCM2902CDB and PCM2900E DB, the PCM2906BDB uniquely balances full-feature USB audio capability (S/PDIF, HID, SpAct™), commercial temperature grade, and best-in-class 96 dB DAC SNR - making it optimal for premium consumer audio peripherals requiring minimal external components.
Availability
PCM2906BDB is available at Aetrix Electronics and suitable for USB speaker development, USB headset production, and USB monitor audio hub design requiring stable component supply and long-term manufacturability.
Supply support for PCM2906BDB 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 leadership in precision audio signal chain solutions.
The PCM2906BDB belongs to TI's Burr-Brown audio codec product line, engineered specifically for USB-native consumer audio endpoints requiring zero-firmware integration, low-jitter clock recovery, and multi-format digital I/O.
FAQ
What USB audio class compliance does the PCM2906BDB support?
The PCM2906BDB is fully compliant with USB Audio Class 1.0 (UAC1) and enumerates as a standard USB audio device without custom drivers on Windows, macOS, and Linux. It implements four interfaces - control, playback, record, and HID - and passes USB-IF certification for full-speed operation at 12 Mbps. The PCM2906BDB uses default descriptors (VID 0x08BB, PID 0x29B6) that are partially programmable per TI specification.
Does the PCM2906BDB require an external crystal or oscillator?
Yes, the PCM2906BDB requires a 12-MHz ±6 ppm fundamental-mode crystal connected between XTI (pin 21) and XTO (pin 20). This crystal drives the on-chip oscillator and PLL to generate the 96-MHz clock used by SpAct™ for USB packet–based clock recovery. No external clock source or oscillator module is needed - only the crystal and two 12-pF load capacitors are required.
How does the PCM2906BDB handle different sampling rates for ADC and DAC simultaneously?
The PCM2906BDB uses SpAct™ architecture to achieve true asynchronous operation: the ADC runs in asynchronous mode (clock recovered from USB IN packets), while the DAC runs in adaptive mode (clock synchronized to USB OUT packet timing). This allows independent sampling - e.g., 44.1 kHz playback and 16 kHz recording - without buffer management complexity or clock drift. The PCM2906BDB supports all standard rates (8–48 kHz for ADC; 32/44.1/48 kHz for DAC).
Can the PCM2906BDB's S/PDIF interface operate independently of USB?
No - the PCM2906BDB's S/PDIF I/O is not autonomous. DIN and DOUT are functionally tied to the USB audio stream: S/PDIF input feeds the ADC path, and S/PDIF output mirrors the DAC output. There is no standalone S/PDIF-to-analog or analog-to-S/PDIF conversion mode. The PCM2906BDB does not support S/PDIF passthrough or format conversion without USB host involvement.
What are the power supply requirements for the PCM2906BDB's internal rails?
The PCM2906BDB derives all internal supplies from VBUS (5 V): VCCCI (codec analog), VCCP1I/VCCP2I (PLL analog), VCCXI (oscillator analog), and VDDI (digital) are generated internally. Each requires a dedicated 0.1-µF ceramic decoupling capacitor to its respective ground plane (AGNDC, AGNDP, AGNDX, DGND). Total operating current is 56–67 mA at 5 V; suspend current is 250 µA. No external regulators are needed beyond basic decoupling.
PCM2906BDB 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 / 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
PCM2906BDB FAQ
1.How can I place an order for PCM2906BDB through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2906BDB 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 PCM2906BDB reliable?
The price and inventory of PCM2906BDB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2906BDB is usually 5 days.
3.What payment methods are accepted for PCM2906BDB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2906BDB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2906BDB?
PCM2906BDB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2906BDB 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 PCM2906BDB?
For technical support, including PCM2906BDB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2906BDB requirements.
6.How does Aetrix verify that PCM2906BDB is sourced from the original manufacturer or authorized distributors?
All PCM2906BDB 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 PCM2906BDB meets industry standards.
7.What is the process for return or replacement of PCM2906BDB?
All PCM2906BDB units undergo pre-shipment inspection (PSI). If there is an issue with PCM2906BDB, 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 PCM2906BDB part is unused and in its original packaging.
Return procedure for PCM2906BDB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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