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Texas Instruments PCM2904DBR
- Part No.:
- PCM2904DBR
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2904DBR.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,443
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Product details
Overview
PCM2904DBR from Texas Instruments is a single-chip USB 1.1-compliant stereo audio codec with integrated full-speed USB transceiver, 16-bit delta-sigma ADC/DAC, and SpAct™ clock recovery architecture. It delivers THD+N of 0.01% (ADC) and 0.005% (DAC), SNR of 89 dB and 96 dB respectively, and supports adaptive playback/ asynchronous record at sampling rates up to 48 kHz - used in USB headsets and audio interface boxes requiring bus-powered, low-jitter analog I/O.
For engineers reviewing the PCM2904DBR datasheet, PCM2904DBR pinout, PCM2904DBR application, or PCM2904DBR equivalent, key selection considerations include its 28-pin SSOP package, absence of S/PDIF interface (vs. PCM2906), HID volume/mute control capability, single 5 V supply operation, and USB audio class compliance without host-side firmware.
Technical Context
The PCM2904DBR implements TI's SpAct™ architecture to recover audio clocks directly from USB packet timing, enabling independent playback and record sampling rates with low jitter. Its analog front-end integrates antialiasing (ADC) and low-pass (DAC) filters, plus on-chip decimation/interpolation digital filters with ±0.05 dB pass-band ripple and –65 dB stop-band attenuation.
It features a fully autonomous USB protocol controller compliant with USB Audio Class 1.0 and HID specifications, supporting four interfaces: standard audio control (IF #0), isochronous data-out (IF #1, adaptive mode), isochronous data-in (IF #2, asynchronous mode), and HID (IF #3). No host driver development is required beyond standard USB audio class support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit ADC/DAC (supports 8/16-bit PCM data formats) |
| Sampling Rates | DAC: 32/44.1/48 kHz (adaptive); ADC: 8–48 kHz (asynchronous) |
| Analog Performance | ADC THD+N = 0.01%, SNR = 89 dB; DAC THD+N = 0.005%, SNR = 96 dB @ 44.1 kHz |
| USB Compliance | Fully compliant with USB 1.1 specification; certified by USB-IF; bus-powered (≤500 mA) |
| Power Supply | Single 5 V supply (VBUS = 4.36–5.25 V); internal 3.3 V regulators for analog/digital domains |
| Operating Temp | –25°C to +85°C ambient; thermal resistance θJA = 100°C/W (28-pin SSOP) |
| Digital Interface | Full-speed USB 1.1 transceiver (D+/D–); no external PHY required |
Pinout & Package
PCM2904DBR is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, JEDEC MO-153 compliant, rated for –25°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+, D– | USB differential I/O | LV-TTL-level full-speed USB transceiver interface; no external PHY needed |
| VINL, VINR | ADC analog inputs | Single-ended stereo inputs referenced to VCOM (VCCCI/2); include antialiasing filter |
| VOUTL, VOUTR | DAC analog outputs | Single-ended stereo voltage outputs with integrated low-pass filter; 0.6×VCCCI p-p swing |
| VBUS | USB power input | Direct connection to USB 5 V supply; powers internal regulators and logic |
| SSPND | Suspend flag output | Active-low open-drain signal indicating USB suspend state (low = suspended) |
| HID0–HID2 | HID control inputs | 3.3 V CMOS inputs with internal pulldown for mute/volume-up/down key reporting |
| XTI, XTO | Crystal oscillator interface | Connects to 12 MHz fundamental-mode crystal; enables SpAct™ clock recovery |
| VCCCI, VCCP1I, VCCP2I, VCCXI, VDDI | Internal power supplies | Dedicated analog/digital rails; each requires local 0.1 µF decoupling to AGND/DGND |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ Clock Recovery | Eliminates need for separate audio PLL or external crystal oscillator; recovers low-jitter audio clock directly from USB packet timing |
| Integrated Analog Filters | On-chip antialiasing (ADC) and low-pass (DAC) filters meet USB audio class requirements without external components |
| HID Volume/Mute Control | Hardware-supported HID endpoints enable OS-native volume/mute adjustment without custom drivers or firmware |
| USB Audio Class Compliance | Pre-certified USB-IF device; enumerates as standard USB audio class device on Windows/macOS/Linux with zero driver customization |
| Bus-Powered Operation | Draws ≤67 mA during active audio operation; meets USB 2.0 low-power device limits (≤100 mA) and supports suspend mode (<210 µA) |
Applications
| USB Headset | USB Audio Interface Box |
|---|---|
Use Scenario: Compact wired headset with microphone and speaker, connecting directly to PC/laptop via USB. IC Role / Device Role / Timing Role: Stereo audio codec handling bidirectional 16-bit PCM streaming, HID key reporting, and SpAct™-derived audio clock synchronization. Use Value: Eliminates external USB PHY, audio clock generator, and analog filter components - reduces BOM count and PCB area while ensuring plug-and-play compatibility. |
Use Scenario: External audio adapter converting line-level analog signals to USB for recording/editing software. IC Role / Device Role / Timing Role: Full-duplex audio interface with independent adaptive playback and asynchronous record paths synchronized via SpAct™. Use Value: Enables sample-accurate recording at 44.1/48 kHz without host CPU intervention or external clock sources - critical for DAW latency consistency. |
| USB Monitor Speaker | USB Audio Speaker |
Use Scenario: Powered desktop monitor with integrated stereo speakers and mic input, using single USB-C or USB-A cable for power and audio. IC Role / Device Role / Timing Role: Bus-powered stereo DAC/ADC subsystem managing speaker output, mic capture, and HID controls (volume/mute). Use Value: Single-chip solution supports simultaneous playback and recording with <210 µA suspend current - extends system standby time and simplifies thermal design. |
Use Scenario: Standalone powered speaker system accepting USB audio stream directly from computer or mobile device. IC Role / Device Role / Timing Role: Primary USB audio endpoint providing high-fidelity 16-bit/48 kHz DAC output with integrated analog LPF and voltage-level translation. Use Value: Delivers 96 dB SNR and 0.005% THD+N without external op-amps or filters - achieves studio-grade output fidelity from compact USB-powered design. |
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 | Includes S/PDIF input/output; identical pinout and core audio specs; adds DIN/DOUT pins (24/25) | Required for optical digital audio I/O; not suitable if S/PDIF is unused and board space is constrained | Select PCM2906DBR only when optical interconnect or legacy digital audio routing is needed. |
| CY7C68013A-56PVXC | USB 2.0 FX2LP microcontroller with no integrated ADC/DAC; requires external audio codec and clocking | Offers programmable firmware control and higher bandwidth but increases BOM, layout complexity, and development effort | Choose only when custom USB descriptors, non-standard audio protocols, or multi-function peripheral integration are required. |
Compared with PCM2906DBR, PCM2904DBR saves two pins and eliminates S/PDIF circuitry - reducing cost and layout overhead for pure analog USB audio devices; versus CY7C68013A, it delivers turnkey audio functionality without firmware development or external codec coordination.
Availability
PCM2904DBR is available at Aetrix Electronics and suitable for USB headset, USB audio interface box, and USB monitor speaker designs requiring stable component supply, long-term industrial availability, and full USB audio class compliance.
Supply support for PCM2904DBR 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 over 50 years of innovation in precision signal chain and power management ICs.
The PCM2904DBR belongs to TI's Burr-Brown audio codec product line, engineered specifically for cost-sensitive, bus-powered USB audio peripherals requiring zero-driver plug-and-play operation and high-fidelity analog performance.
FAQ
Does PCM2904DBR require an external crystal oscillator?
Yes, PCM2904DBR requires a 12 MHz fundamental-mode crystal connected between XTI (pin 21) and XTO (pin 20). This crystal feeds the internal oscillator that drives the SpAct™ clock recovery system. The device does not operate without this crystal, and no internal RC oscillator is provided as a substitute.
What is the maximum sampling rate supported by PCM2904DBR for ADC and DAC?
PCM2904DBR supports DAC playback at 32 kHz, 44.1 kHz, and 48 kHz using adaptive USB mode. For ADC recording, it supports asynchronous sampling rates including 8, 11.025, 16, 22.05, 32, 44.1, and 48 kHz - with 48 kHz being the maximum for both directions. All rates are natively supported without firmware modification.
Can PCM2904DBR be used in a self-powered USB device?
No - PCM2904DBR is designed exclusively for bus-powered operation. Its VBUS pin must be connected directly to the USB 5 V supply (4.36–5.25 V), and it lacks provisions for external power domain switching or VBUS detection override. Attempting self-powered use violates USB specification compliance and may cause enumeration failure.
How does PCM2904DBR handle volume control without host driver support?
PCM2904DBR implements a hardware-based HID interface (Interface #3) that reports mute, volume-up, and volume-down key presses via pins HID0–HID2. These signals are interpreted by the OS USB HID class driver - enabling native volume control in Windows, macOS, and Linux without custom drivers or firmware updates to the PCM2904DBR itself.
Is PCM2904DBR pin-compatible with PCM2906DBR?
Yes, PCM2904DBR and PCM2906DBR share identical 28-pin SSOP packaging and pin mapping for all common functions. The only differences are that PCM2906DBR repurposes pins 24 (DIN) and 25 (DOUT) for S/PDIF I/O, whereas PCM2904DBR uses those same pins as TEST0 and TEST1 (which must be tied to GND and left open, respectively). PCBs designed for PCM2904DBR can accept PCM2906DBR with minor trace modifications.
PCM2904DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
PCM2904DBR FAQ
1.How can I place an order for PCM2904DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2904DBR 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 PCM2904DBR reliable?
The price and inventory of PCM2904DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2904DBR is usually 5 days.
3.What payment methods are accepted for PCM2904DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2904DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2904DBR?
PCM2904DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2904DBR 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 PCM2904DBR?
For technical support, including PCM2904DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2904DBR requirements.
6.How does Aetrix verify that PCM2904DBR is sourced from the original manufacturer or authorized distributors?
All PCM2904DBR 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 PCM2904DBR meets industry standards.
7.What is the process for return or replacement of PCM2904DBR?
All PCM2904DBR units undergo pre-shipment inspection (PSI). If there is an issue with PCM2904DBR, 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 PCM2904DBR part is unused and in its original packaging.
Return procedure for PCM2904DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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