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Texas Instruments PCM2906DBRG4
- Part No.:
- PCM2906DBRG4
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2906DBRG4.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,236
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Product details
Overview
PCM2906DBRG4 from Texas Instruments is a stereo audio codec IC 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 bus supply, supports independent adaptive playback (32/44.1/48 kHz) and asynchronous record (8–48 kHz), and delivers 93 dB dynamic range (DAC) and 89 dB (ADC) for USB audio speaker, headset, and monitor applications.
For engineers reviewing the PCM2906DBRG4 datasheet, PCM2906DBRG4 pinout, PCM2906DBRG4 application, or PCM2906DBRG4 equivalent, key selection criteria include S/PDIF capability, THD+N ≤ 0.005% (DAC), USB HID volume/mute control support, 28-pin SSOP package compatibility, and SpAct-based jitter reduction for low-latency audio streaming.
Technical Context
The PCM2906DBRG4 integrates a USB protocol controller compliant with USB 1.1, eliminating host-side firmware requirements while supporting programmable descriptors (vendor ID/product ID). Its SpAct™ architecture recovers audio clocks directly from USB packet timing, enabling independent playback and record sampling rates without external PLLs.
It features dual delta-sigma converters: a stereo ADC with antialiasing filter and decimation digital filter (±0.05 dB pass-band ripple, –65 dB stop-band attenuation), and a stereo DAC with oversampling interpolation and de-emphasis filter (±0.1 dB pass-band ripple, –43 dB stop-band attenuation), both operating from a single 12-MHz crystal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC SNR | 96 dB (A-weighted, EIAJ); enables high-fidelity playback in consumer audio interfaces |
| ADC THD+N | 0.01% at –0.5 dBFS; ensures clean microphone/line-in capture in USB headsets |
| Sampling Rates | DAC: 32/44.1/48 kHz (adaptive); ADC: 8–48 kHz (asynchronous); supports multi-rate USB audio streaming |
| S/PDIF Support | DIN (pin 24) and DOUT (pin 25); enables digital audio passthrough and optical I/O in audio boxes |
| Supply Voltage | VBUS = 4.36–5.25 V; fully bus-powered with no external regulator required |
| Operating Temp | –25°C to +85°C; suitable for industrial-grade USB peripherals and embedded audio systems |
| Package | 28-lead SSOP (28DB); surface-mount compatible with standard reflow profiles |
Pinout & Package
PCM2906DBRG4 uses a 28-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch, optimized for compact USB audio designs requiring analog and digital I/O isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+ / D– (pins 1, 2) | USB differential transceiver | LV-TTL-level full-speed USB interface; requires 27-Ω series termination per line |
| VINL / VINR (pins 12, 13) | ADC analog inputs | Single-ended stereo line/mic inputs referenced to VCOM (VCCCI/2); 30-kΩ input impedance |
| VOUTL / VOUTR (pins 16, 15) | DAC analog outputs | Single-ended voltage outputs (0.6×VCCCI p-p); AC-coupled to 10-kΩ load |
| DIN / DOUT (pins 24, 25) | S/PDIF digital I/O | 3.3-V CMOS-level S/PDIF receiver/transmitter; 5-V tolerant; supports optical/toslink interfaces |
| XTI / XTO (pins 21, 20) | Crystal oscillator interface | Drives 12-MHz fundamental-mode crystal; internal oscillator eliminates external clock source |
| HID0–HID2 (pins 5–7) | HID control inputs | Active-high mute/volume-up/volume-down signals; inform host OS of physical button presses |
| SSPND (pin 28) | Suspend flag output | Active-low open-drain signal indicating USB suspend state; used for power management sequencing |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ clock recovery | Eliminates external PLL and reduces jitter to <100 ps RMS for stable playback/record sync |
| Integrated USB audio class compliance | Fully implements USB Audio Class 1.0 descriptors; plug-and-play on Windows/macOS/Linux |
| Programmable HID endpoints | Supports mute/volume control via standard USB HID reports-no custom driver needed |
| On-chip analog filters | Includes antialiasing (ADC) and low-pass (DAC) filters; removes need for external RC networks |
| Bus-powered operation | Draws ≤67 mA at 5 V; meets USB 1.1 500-mA limit with margin for peripheral expansion |
Applications
| USB Audio Speaker | USB Headset |
|---|---|
Use Scenario: Desktop speaker system with USB plug-and-play connectivity and hardware volume/mute controls. IC Role / Device Role / Timing Role: Primary audio codec handling USB isochronous data ingestion, DAC conversion, analog output buffering, and HID reporting. Use Value: Delivers 96 dB SNR and ±0.1 dB pass-band ripple for transparent stereo playback without external clocking or filtering components. |
Use Scenario: Dual-mode headset supporting analog mic input and stereo headphone output over USB. IC Role / Device Role / Timing Role: Simultaneous ADC (mic path) and DAC (headphone path) with independent sampling rate control via SpAct™. Use Value: Enables zero-latency voice capture (8–48 kHz async) and high-fidelity playback (44.1/48 kHz adaptive) using one 12-MHz crystal. |
| USB Audio Interface Box | USB Monitor with Audio |
Use Scenario: Compact desktop audio interface with S/PDIF loopback, analog I/O, and USB host connection. IC Role / Device Role / Timing Role: Central hub for bidirectional S/PDIF (DIN/DOUT), stereo ADC/DAC, and USB streaming with HID control. Use Value: Integrates digital and analog audio paths in one chip-reduces BOM count by eliminating separate S/PDIF transceivers and clock buffers. |
Use Scenario: All-in-one monitor with built-in speakers, mic input, and USB-C/USB-A upstream audio interface. IC Role / Device Role / Timing Role: Audio subsystem managing USB audio class enumeration, analog output drive, and HID volume control. Use Value: Supports simultaneous USB audio streaming and HID reporting within 500-mA bus power budget-no auxiliary power required. |
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 |
|---|---|---|---|
| PCM2906DBR | Same die, tape-and-reel packaging (vs. PCM2906DBRG4's tube); identical electrical specs and pinout | No functional difference; selected for automated SMT assembly vs. manual/hand-solder prototyping | Choose PCM2906DBR for high-volume production; PCM2906DBRG4 for evaluation and low-run builds |
| MAX14547ETL+ | 32-bit stereo USB audio codec with integrated Class D amplifier; requires external 24.576-MHz crystal | Targets battery-powered portable speakers; lacks S/PDIF and has higher THD+N (0.02%) | Select MAX14547ETL+ only when integrated amplification and extended resolution are required-S/PDIF and SpAct™ are exclusive to PCM2906DBRG4 |
Compared with PCM2906DBR, PCM2906DBRG4 offers identical performance in tube packaging for flexibility in small-batch design validation; compared with MAX14547ETL+, it provides superior jitter performance via SpAct™ and native S/PDIF I/O-critical for professional audio routing and optical interconnects.
Availability
PCM2906DBRG4 is available at Aetrix Electronics and suitable for USB audio speaker, USB headset, and USB audio interface box applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.
Supply support for PCM2906DBRG4 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 decades of expertise in precision audio signal chains and USB interface IP.
The PCM2906DBRG4 belongs to TI's Burr-Brown audio codec product line, designed specifically for cost-sensitive, bus-powered USB audio peripherals requiring high-fidelity conversion, minimal external components, and seamless OS compatibility.
FAQ
What is the primary function of the PCM2906DBRG4 in a USB audio system?
The PCM2906DBRG4 serves as a complete stereo audio codec with integrated USB 1.1 interface, performing analog-to-digital conversion (ADC) for microphone/line input, digital-to-analog conversion (DAC) for headphone/speaker output, S/PDIF digital I/O, and USB HID volume/mute control-all within a single 28-pin SSOP package. It eliminates the need for external USB controllers, clock generators, or audio filters in compliant USB audio devices.
Does the PCM2906DBRG4 require an external crystal oscillator?
Yes-the PCM2906DBRG4 requires a 12-MHz fundamental-mode crystal connected between XTI (pin 21) and XTO (pin 20). This crystal drives the internal oscillator that feeds the SpAct™ clock recovery engine and PLLs. No external clock source or buffer is needed, but the crystal must meet TI's specified load capacitance and stability requirements per the PCM2906DBRG4 datasheet.
How does the PCM2906DBRG4 handle different sampling rates for playback and recording?
The PCM2906DBRG4 uses SpAct™ technology to independently recover clocks for playback (adaptive mode) and recording (asynchronous mode). Playback supports 32/44.1/48 kHz via USB isochronous OUT endpoints, while recording supports 8–48 kHz via isochronous IN endpoints-including non-standard rates like 11.025 kHz and 22.05 kHz-without requiring synchronized master clocks or external FIFOs.
Can the PCM2906DBRG4 be used in a bus-powered USB device without external regulators?
Yes-the PCM2906DBRG4 is fully bus-powered and operates directly from the USB VBUS (4.36–5.25 V). It integrates internal LDOs to generate all required analog (VCCCI, VCCP1I, etc.) and digital (VDDI) supply rails. Total active current draw is ≤67 mA at 5 V, well within the USB 1.1 500-mA limit, making external regulation unnecessary for standard audio applications.
What is the role of the HID0, HID1, and HID2 pins on the PCM2906DBRG4?
HID0 (pin 5), HID1 (pin 6), and HID2 (pin 7) are active-high CMOS inputs that report physical button states-mute, volume up, and volume down-to the host PC via USB HID class endpoints. These pins connect directly to momentary switches (with internal pulldowns), enabling OS-level audio control without custom drivers or MCU intervention. The PCM2906DBRG4 handles HID descriptor enumeration and report generation autonomously.
PCM2906DBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
PCM2906DBRG4 FAQ
1.How can I place an order for PCM2906DBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2906DBRG4 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 PCM2906DBRG4 reliable?
The price and inventory of PCM2906DBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2906DBRG4 is usually 5 days.
3.What payment methods are accepted for PCM2906DBRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2906DBRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2906DBRG4?
PCM2906DBRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2906DBRG4 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 PCM2906DBRG4?
For technical support, including PCM2906DBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2906DBRG4 requirements.
6.How does Aetrix verify that PCM2906DBRG4 is sourced from the original manufacturer or authorized distributors?
All PCM2906DBRG4 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 PCM2906DBRG4 meets industry standards.
7.What is the process for return or replacement of PCM2906DBRG4?
All PCM2906DBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with PCM2906DBRG4, 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 PCM2906DBRG4 part is unused and in its original packaging.
Return procedure for PCM2906DBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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