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Texas Instruments PCM2906DB
- Part No.:
- PCM2906DB
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2906DB.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,194
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Product details
Overview
PCM2906DB from Texas Instruments is a single-chip stereo audio codec with integrated USB 1.1 full-speed interface, S/PDIF input/output, 16-bit delta-sigma ADC/DAC, and on-chip SpAct™ clock recovery. It operates from a single 5-V USB bus supply, supports independent asynchronous ADC and adaptive DAC sampling (up to 48 kHz), and delivers 96 dB SNR (DAC) and 89 dB SNR (ADC) for USB audio speaker, headset, and monitor applications.
For engineers reviewing the PCM2906DB datasheet, PCM2906DB pinout, PCM2906DB application, or PCM2906DB equivalent, this page provides verified technical context, validated pin functions, confirmed S/PDIF-enabled stereo audio performance, real-world USB audio system integration details, and two documented alternative parts for design flexibility.
Technical Context
The PCM2906DB implements TI's SpAct™ architecture to recover low-jitter audio clocks directly from USB packet timing-enabling independent asynchronous recording (ADC) and adaptive playback (DAC) without external PLLs. Its dual-mode USB interface supports HID volume/mute control via dedicated pins (HID0–HID2) and configurable descriptors for vendor/product ID customization.
It integrates analog front-end circuitry including antialiasing filters (ADC), low-pass filters (DAC), internal voltage regulation (5 V → 3.3 V), and separate analog/digital/PLL ground domains (AGNDC, AGNDP, DGNDU). The S/PDIF transceiver (DIN/DOUT) operates at 3.3-V CMOS level with 5-V tolerance and is exclusive to the PCM2906 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 16-bit delta-sigma with 89 dB SNR and ±0.05 dB pass-band ripple - enables high-fidelity microphone input in USB headsets. |
| DAC Resolution | 16-bit delta-sigma with 96 dB SNR and ±0.1 dB pass-band ripple - supports CD-quality audio output in USB speakers. |
| Sampling Rates | ADC: 8–48 kHz (asynchronous); DAC: 32/44.1/48 kHz (adaptive) - allows flexible host synchronization and jitter-tolerant playback. |
| S/PDIF Interface | DIN (input) and DOUT (output) pins with 3.3-V CMOS logic and 5-V tolerance - enables digital audio passthrough without external level-shifting. |
| USB Compliance | Fully compliant with USB 1.1 specification; certified by USB-IF; supports isochronous IN/OUT + HID control endpoints - ensures plug-and-play OS compatibility. |
| Power Supply | Single 5-V USB bus supply (4.36–5.25 V); internal 3.3-V regulation; 67 mA typical operating current - eliminates need for external LDOs in bus-powered designs. |
| Operating Temperature | –25°C to +85°C - qualified for industrial-grade USB audio peripherals deployed in non-climate-controlled environments. |
Pinout & Package
PCM2906DB is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.64-mm lead pitch, JEDEC MO-153 compliant, and rated for –25°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+ | USB differential data plus | LV-TTL I/O for full-speed USB communication; requires 1.5-kΩ pull-up to VBUS for device enumeration. |
| DIN | S/PDIF digital audio input | 3.3-V CMOS input with internal pulldown; accepts consumer-grade S/PDIF streams (IEC 60958) for digital audio capture. |
| DOUT | S/PDIF digital audio output | 3.3-V CMOS output; drives standard 75-Ω coaxial S/PDIF lines without external buffer. |
| HID0–HID2 | HID control inputs | Active-high 3.3-V CMOS pins for mute/volume up/down; inform host OS of physical button presses without ADC/DAC involvement. |
| SSPND | USB suspend flag output | Active-low open-drain signal indicating USB suspend state; used to gate power to external analog stages. |
| VINL/VINR | ADC analog inputs | Single-ended 0.6×VCCCI p-p inputs with integrated antialiasing filter; accept line/mic-level signals directly. |
| VOUTL/VOUTR | DAC analog outputs | Single-ended 0.6×VCCCI p-p outputs with integrated LPF; drive headphones or line drivers without external filtering. |
| XTI/XTO | Crystal oscillator interface | 3.3-V CMOS input/output pair for 12-MHz fundamental-mode crystal; enables precise clock generation without external oscillator. |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ clock recovery | Eliminates external crystal oscillators for DAC/ADC paths by deriving low-jitter audio clocks directly from USB packet timing. |
| Integrated S/PDIF transceiver | Enables bidirectional digital audio I/O (DIN/DOUT) without external receiver/transmitter ICs or level shifters. |
| Configurable USB descriptors | Vendor ID, Product ID, and string descriptors can be modified per request-supporting custom branding and driver differentiation. |
| On-chip analog filtering | Includes antialiasing (ADC) and low-pass (DAC) filters with –65 dB stop-band attenuation-reducing BOM count and layout complexity. |
| HID volume/mute control | Hardware-accelerated HID endpoint handles volume/mute commands locally-offloading host CPU and enabling instant response. |
Applications
| USB Audio Speaker | USB Headset |
|---|---|
Use Scenario: Compact desktop speaker with USB plug-and-play connectivity and hardware volume control. IC Role / Device Role / Timing Role: Stereo DAC outputs drive amplifier stage; SpAct™ ensures jitter-free playback; HID0–HID2 detect physical volume/mute buttons. Use Value: Eliminates need for external clock source, S/PDIF receiver, or HID microcontroller-reducing BoM cost by ≥3 components. |
Use Scenario: Dual-mode headset supporting analog mic input and digital audio output via USB. IC Role / Device Role / Timing Role: ADC digitizes mono mic signal; DAC outputs stereo audio; S/PDIF (DIN) receives digital audio from PC for sidetone mixing. Use Value: Single-chip solution supports both analog mic path and digital S/PDIF return path-enabling zero-latency sidetone without additional codecs. |
| USB Audio Interface Box | USB Monitor with Audio |
Use Scenario: External audio interface for content creators requiring clean ADC/DAC conversion and S/PDIF loopback. IC Role / Device Role / Timing Role: ADC captures line-in with 89 dB SNR; DAC outputs to headphones/line-out; DIN/DOUT enable digital monitoring and routing. Use Value: Full-duplex 16-bit audio with independent sample rate control (asynchronous record + adaptive play) avoids resampling artifacts. |
Use Scenario: All-in-one monitor with built-in speakers and USB-C/USB-A audio input. IC Role / Device Role / Timing Role: DAC converts USB audio stream to analog for internal speakers; SSPND signal gates speaker amplifier during USB suspend. Use Value: Integrated suspend flag (SSPND) enables automatic power-down of audio amplifiers-meeting USB power budget requirements. |
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 |
|---|---|---|---|
| PCM2904DB | No S/PDIF interface (DIN/DOUT pins absent); otherwise identical pinout, USB functionality, and analog performance. | Not suitable for designs requiring digital audio I/O; ideal for cost-sensitive USB speaker/headset where S/PDIF is unused. | Select PCM2904DB only if S/PDIF functionality is unnecessary-reduces component cost while maintaining full USB audio compatibility. |
| CY7C65632 | USB 2.0 hub controller with no integrated ADC/DAC; requires external audio codec; supports up to 4 downstream ports. | Used in multi-peripheral USB hubs-not a functional replacement; only relevant when expanding USB topology alongside audio devices. | CY7C65632 serves a different system role (hub expansion) and cannot replace PCM2906DB's audio conversion function-evaluate only for upstream port aggregation. |
Compared with PCM2904DB, PCM2906DB adds S/PDIF I/O at identical pin count and power profile; compared with CY7C65632, it delivers complete audio signal chain functionality rather than USB infrastructure-making it the sole direct functional alternative among TI's legacy audio codecs.
Availability
PCM2906DB is available at Aetrix Electronics and suitable for USB audio speaker, USB headset, and USB monitor applications requiring stable component supply, long-term industrial temperature support (–25°C to +85°C), and certified USB-IF compliance.
Supply support for PCM2906DB 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 PCM2906DB belongs to TI's legacy USB audio codec product line, designed specifically for cost-effective, bus-powered stereo audio peripherals requiring minimal external components and full USB audio class compliance.
FAQ
What distinguishes PCM2906DB from PCM2904DB?
The PCM2906DB includes dedicated S/PDIF input (DIN) and output (DOUT) pins, while the PCM2904DB omits them entirely. Both share identical 28-pin SSOP packaging, USB 1.1 compliance, 16-bit ADC/DAC performance, and SpAct™ clock recovery. The S/PDIF capability makes PCM2906DB suitable for digital audio passthrough applications where PCM2904DB is not.
Does PCM2906DB require an external crystal oscillator?
No. PCM2906DB uses an internal 12-MHz crystal oscillator circuit connected to XTI/XTO pins. A fundamental-mode 12.000 MHz ±100 ppm crystal is required, but no external oscillator IC is needed-the chip generates all necessary clocks internally via PLL and SpAct™.
Can PCM2906DB operate with USB 2.0 hosts?
Yes. PCM2906DB is USB 1.1 full-speed compliant (12 Mbps) and fully backward compatible with USB 2.0 and USB 3.x hosts. It enumerates as a standard USB audio device under Windows, macOS, and Linux without custom drivers-leveraging native OS USB audio class support.
What is the function of the SSPND pin on PCM2906DB?
The SSPND pin is an active-low open-drain output that asserts low during USB suspend mode. It allows external circuitry-such as headphone amplifiers or LED indicators-to power down automatically, helping the overall system meet USB suspend current limits (<500 µA).
How does PCM2906DB handle different sampling rates between ADC and DAC?
PCM2906DB uses asynchronous mode for ADC (sampling clock derived independently) and adaptive mode for DAC (clock synchronized to USB packet timing). This decoupling prevents sample rate conversion artifacts and enables simultaneous 44.1 kHz recording and 48 kHz playback without resampling.
PCM2906DB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- 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
PCM2906DB FAQ
1.How can I place an order for PCM2906DB through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2906DB 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 PCM2906DB reliable?
The price and inventory of PCM2906DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2906DB is usually 5 days.
3.What payment methods are accepted for PCM2906DB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2906DB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2906DB?
PCM2906DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2906DB 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 PCM2906DB?
For technical support, including PCM2906DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2906DB requirements.
6.How does Aetrix verify that PCM2906DB is sourced from the original manufacturer or authorized distributors?
All PCM2906DB 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 PCM2906DB meets industry standards.
7.What is the process for return or replacement of PCM2906DB?
All PCM2906DB units undergo pre-shipment inspection (PSI). If there is an issue with PCM2906DB, 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 PCM2906DB part is unused and in its original packaging.
Return procedure for PCM2906DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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