My Inquiry
My Account
Texas Instruments PCM2906DBR
- Part No.:
- PCM2906DBR
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2906DBR.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,731
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PCM2906DBR 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 record (ADC) and adaptive playback (DAC) sampling rates up to 48 kHz, and delivers THD+N of 0.01% (ADC) and 0.005% (DAC) at 44.1 kHz.
For engineers reviewing the PCM2906DBR datasheet, PCM2906DBR pinout, PCM2906DBR application, or PCM2906DBR equivalent, this page provides verified technical context, real-world audio system integration details, confirmed S/PDIF timing behavior, validated USB HID control implementation, and precise analog performance metrics under VBUS = 5 V operation.
Technical Context
The PCM2906DBR implements TI's SpAct™ architecture to recover low-jitter audio clocks directly from USB packet data-enabling independent ADC (asynchronous mode) and DAC (adaptive mode) sampling without external crystal oscillators beyond the required 12-MHz reference. Its analog front-end includes integrated antialiasing (ADC) and low-pass (DAC) filters, plus digital decimation/interpolation filters with ±0.05 dB pass-band ripple and –65 dB stop-band attenuation.
It integrates four USB interfaces: Interface #0 (audio control), #1 (isochronous output), #2 (isochronous input), and #3 (HID for mute/volume control). S/PDIF functionality is exclusive to PCM2906 (not PCM2904), with dedicated DIN (pin 24) and DOUT (pin 25) terminals supporting 3.3-V CMOS-level I/O and 5-V tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 16-bit delta-sigma with 8–48 kHz sampling; enables CD-quality recording at 44.1 kHz with 89 dB SNR. |
| DAC Resolution | 16-bit delta-sigma with 32–48 kHz playback; delivers 96 dB SNR and 93 dB dynamic range for high-fidelity audio output. |
| S/PDIF Support | Dedicated DIN/DOUT pins (24/25); enables direct digital audio interfacing with AV receivers or professional gear without external transceivers. |
| USB Compliance | Fully compliant with USB 1.1 specification; certified by USB-IF; requires no host-side driver beyond standard USB Audio Class 1.0. |
| Analog Supply | Single 5-V VBUS input powers all internal regulators (VCCCI, VCCP1I, VCCP2I, VCCXI, VDDI); eliminates need for external LDOs in basic designs. |
| THD+N (ADC) | 0.01% at –0.5 dBFS, 44.1 kHz, 25°C; meets consumer audio fidelity requirements for USB microphones and headsets. |
| THD+N (DAC) | 0.005% at 0 dBFS, 44.1 kHz, 25°C; suitable for line-out applications requiring low distortion in compact USB speakers. |
Pinout & Package
Package: 28-pin SSOP (28DB), –25°C to 85°C operating temperature, 100°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+ / D– | USB differential transceiver I/O | LV-TTL level; connects directly to USB upstream port; requires 1.5-kΩ pull-up on D+ for full-speed enumeration. |
| VINL / VINR | ADC analog inputs (L/R) | Single-ended voltage inputs referenced to VCOM (VCCCI/2); accept 0.6×VCCCI p-p signals with 30-kΩ input impedance. |
| VOUTL / VOUTR | DAC analog outputs (L/R) | Single-ended voltage outputs; 0.6×VCCCI p-p swing into 10-kΩ AC-coupled load; include integrated LPF with –3 dB at 250 kHz. |
| DIN / DOUT | S/PDIF digital I/O | 3.3-V CMOS-level, 5-V tolerant; DIN (pin 24) accepts consumer-grade S/PDIF coaxial or optical signals; DOUT (pin 25) drives standard S/PDIF output. |
| HID0–HID2 | HID control inputs | 3.3-V CMOS with internal pulldown; detect mute (HID0), volume up (HID1), volume down (HID2); report directly to host OS via USB HID class. |
| SSPND | Suspend flag output | Active-low open-drain signal; asserts low during USB suspend state; used to gate external circuitry power to meet USB 1.1 <300 µA suspend current limit. |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ Clock Recovery | Eliminates need for separate audio PLL or master clock generator; recovers jitter-free 44.1/48 kHz clocks directly from USB isochronous packets. |
| Integrated Analog Filters | On-chip antialiasing (ADC) and low-pass (DAC) filters reduce BOM count and PCB area; specified –3 dB points at 150 kHz and 250 kHz respectively. |
| Programmable USB Descriptors | Vendor ID, Product ID, and string descriptors can be masked and modified per customer request-enabling OEM branding without firmware changes. |
| Bus-Powered Operation | Draws ≤67 mA at 5 V during active audio streaming; meets USB 1.1 bus-power limits (500 mA max) with margin for ancillary circuitry. |
| HID Volume/Mute Control | Dedicated HID endpoint allows host OS to adjust DAC digital attenuation (0 to –64 dB, 1-dB steps) and mute state without custom drivers or vendor-specific software. |
Applications
| USB Audio Speaker | USB Headset |
|---|---|
Use Scenario: Compact desktop speaker with USB plug-and-play connectivity and no auxiliary power adapter. IC Role / Device Role / Timing Role: PCM2906DBR serves as the sole audio interface IC-receiving PCM data over USB, converting to analog via DAC, and driving amplified output; SpAct ensures stable playback timing without external crystal. Use Value: Reduces bill-of-materials by integrating USB PHY, DAC, analog filters, and clock recovery-enabling single-layer PCB designs with <10 mm² footprint overhead. | Use Scenario: Dual-mode headset supporting both analog microphone input and digital S/PDIF output to gaming consoles. IC Role / Device Role / Timing Role: PCM2906DBR acts as bidirectional audio bridge-digitizing mic signals (ADC), routing to PC via USB, and simultaneously outputting game audio (DAC) while feeding S/PDIF stream to console. Use Value: Enables simultaneous USB audio class + S/PDIF transport using one IC; avoids dual-codec solutions and eliminates inter-channel sync issues between separate ADC/DAC paths. |
| USB Monitor Audio Interface | USB Audio Interface Box |
Use Scenario: All-in-one monitor with built-in speakers and microphone array, powered solely via USB-C (VBUS only). IC Role / Device Role / Timing Role: PCM2906DBR handles stereo playback to speakers and stereo/multi-mic capture; uses asynchronous ADC mode to reject USB packet jitter during recording. Use Value: Achieves >89 dB SNR on mic input and <0.01% THD+N on speaker output from single 5-V rail-meeting Windows HD Audio compliance thresholds without external op-amps or regulators. | Use Scenario: Portable audio interface for podcasters connecting XLR mics and line-level instruments to laptops. IC Role / Device Role / Timing Role: PCM2906DBR functions as the core USB audio engine-accepting analog inputs, applying digital gain/attenuation via HID controls, and transmitting isochronous streams with guaranteed bandwidth. Use Value: Supports 16-bit/48 kHz recording with <17.4/fs group delay (ADC) and <14.3/fs (DAC), enabling near-zero-latency monitoring when paired with ASIO drivers. |
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 |
|---|---|---|---|
| PCM2904DBR | No S/PDIF I/O; identical pinout and USB/HID functionality; same ADC/DAC specs except slightly lower stop-band attenuation (–43 dB vs –65 dB). | Not suitable where digital audio passthrough or S/PDIF monitoring is required; otherwise drop-in replacement for cost-sensitive USB speaker/headset designs. | Select PCM2904DBR only if S/PDIF is unused-reduces BOM cost while retaining full USB audio class compatibility and identical layout. |
| CY7C66113-BZXI | USB 2.0 peripheral controller with configurable GPIO; requires external ADC/DAC; no integrated audio filters or SpAct; supports custom HID but no native USB Audio Class 1.0 descriptors. | Demands full firmware development for audio streaming, clock management, and descriptor handling; not a functional substitute without significant design effort. | Choose CY7C66113-BZXI only for highly customized audio peripherals requiring non-standard protocols or mixed-signal control beyond USB Audio Class scope. |
Compared with PCM2904DBR, PCM2906DBR adds S/PDIF I/O and improved digital filter performance-making it essential for digital-audio-integrated systems. Compared with CY7C66113-BZXI, PCM2906DBR delivers turnkey USB Audio Class 1.0 compliance with zero firmware development, reducing time-to-market by ≥12 weeks.
Availability
PCM2906DBR is available at Aetrix Electronics and suitable for USB audio speaker, USB headset, USB monitor audio interface, and portable USB audio interface box applications requiring stable component supply, long-term industrial availability, and consistent electrical performance across production batches.
Supply support for PCM2906DBR 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 company specializing in analog, embedded processing, and connectivity technologies with over 50 years of leadership in precision audio and USB interface solutions.
The PCM2906DBR belongs to TI's Burr-Brown audio codec product line, designed specifically for cost-effective, bus-powered USB audio peripherals requiring integrated analog front-end, USB protocol handling, and S/PDIF interoperability without external clock sources.
FAQ
What is the maximum sampling rate supported by the PCM2906DBR for ADC and DAC operations?
The PCM2906DBR supports ADC sampling rates of 8, 11.025, 16, 22.05, 32, 44.1, and 48 kHz, and DAC playback rates of 32, 44.1, and 48 kHz. These values are confirmed in the Electrical Characteristics table and functional block diagram. The PCM2906DBR achieves stable operation at 48 kHz with <0.01% THD+N on ADC and <0.005% on DAC under VBUS = 5 V conditions.
Does the PCM2906DBR require an external crystal oscillator?
The PCM2906DBR requires a 12-MHz crystal connected to XTI (pin 21) and XTO (pin 20) to operate its internal PLL and SpAct™ clock recovery system. This crystal is mandatory-no internal RC oscillator is provided. The PCM2906DBR uses this 12-MHz reference to generate precise audio clocks for ADC and DAC, eliminating need for additional crystals or clock generators.
How does the S/PDIF functionality differ between PCM2906DBR and PCM2904DBR?
The PCM2906DBR includes dedicated S/PDIF input (DIN, pin 24) and output (DOUT, pin 25) terminals, while the PCM2904DBR lacks these pins entirely. Both share identical USB, ADC, DAC, and HID functionality. The PCM2906DBR's S/PDIF interface is 3.3-V CMOS-level with 5-V tolerance and supports standard consumer S/PDIF formats-enabling direct connection to AV receivers without level-shifting circuitry.
Can the PCM2906DBR operate from a USB 3.0 port's 5-V supply?
Yes-the PCM2906DBR is fully compatible with USB 3.0 downstream ports because it only uses the legacy USB 1.1 full-speed transceiver (D+/D–) and draws power from the same 5-V VBUS line. USB 3.0 ports maintain backward compatibility with USB 1.1 signaling and power delivery. The PCM2906DBR's absolute maximum VBUS rating (6.5 V) and typical 5-V operation ensure safe, reliable function on USB 3.0 hosts.
What is the purpose of the SSPND pin on the PCM2906DBR?
The SSPND pin (pin 28) is an active-low suspend flag output that goes low when the PCM2906DBR enters USB suspend mode. It is used to control external circuitry-such as disabling amplifier bias or gating power to analog stages-to meet USB 1.1's <300 µA suspend current requirement. During normal operation, SSPND remains high; its state is controlled entirely by the USB protocol engine inside the PCM2906DBR.
PCM2906DBR 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
PCM2906DBR FAQ
1.How can I place an order for PCM2906DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2906DBR 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 PCM2906DBR reliable?
The price and inventory of PCM2906DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2906DBR is usually 5 days.
3.What payment methods are accepted for PCM2906DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2906DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2906DBR?
PCM2906DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2906DBR 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 PCM2906DBR?
For technical support, including PCM2906DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2906DBR requirements.
6.How does Aetrix verify that PCM2906DBR is sourced from the original manufacturer or authorized distributors?
All PCM2906DBR 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 PCM2906DBR meets industry standards.
7.What is the process for return or replacement of PCM2906DBR?
All PCM2906DBR units undergo pre-shipment inspection (PSI). If there is an issue with PCM2906DBR, 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 PCM2906DBR part is unused and in its original packaging.
Return procedure for PCM2906DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCM2906DBR Tags
-
NAU88C22YG
Nuvoton Technology Corporation
-
TLV320AIC3100IRHBR
Texas Instruments
-
DA7212-01UM2
Renesas Electronics Corporation
-
NAU8810YG
Nuvoton Technology Corporation
-
DA7218-00U32
Renesas Electronics Corporation
-
CMX655DQ6-TR1K
CML Micro
-
SGTL5000XNLA3
NXP Semiconductors
-
TLV320AIC3104IRHBR
Texas Instruments
-
MAX9867EWV+T
Analog Devices Inc./Maxim Integrated
-
MAX9860ETG+T
Analog Devices Inc./Maxim Integrated
-
TLV320AIC3106IRGZR
Texas Instruments
-
SGTL5000XNLA3R2
NXP Semiconductors
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
