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Texas Instruments PCM2902BDB
- Part No.:
- PCM2902BDB
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2902BDB.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,541
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Product details
Overview
PCM2902BDB from Texas Instruments is a single-chip, USB-compliant stereo audio codec with integrated S/PDIF interface, 16-bit delta-sigma ADC/DAC, and SpAct™ clock recovery architecture. It delivers THD+N = 0.01% (ADC) and 0.005% (DAC), 96 dB SNR (DAC), and supports sampling rates up to 48 kHz for playback and 44.1 kHz for recording - used in USB audio interface boxes requiring bus-powered, low-jitter digital audio conversion.
For engineers reviewing the PCM2902BDB datasheet, PCM2902BDB pinout, PCM2902BDB application, or PCM2902BDB equivalent, this page provides verified functional context, SSOP-28 package mapping, S/PDIF-enabled audio path details, and validated alternative parts for USB audio system design.
Technical Context
The PCM2902BDB integrates a full-speed USB 2.0 protocol controller with no firmware required, adaptive mode for playback and asynchronous mode for record, and TI's SpAct™ architecture that recovers audio clock directly from USB packet data - eliminating external crystal oscillators beyond the mandatory 12-MHz reference. Its analog front-end includes on-chip antialiasing (ADC) and low-pass (DAC) filters, plus digital high-pass filtering for DC offset suppression.
It features dual independent PLLs: one for ADC clock generation and another for DAC clock synthesis, enabling simultaneous but non-matching sample rate operation (e.g., 44.1 kHz playback + 48 kHz record). The S/PDIF transceiver (DIN/DOUT pins) operates at 3.3-V CMOS level with 5-V tolerance on DIN and supports consumer-grade digital audio I/O without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit delta-sigma ADC and DAC - enables CD-quality audio digitization and reconstruction without external oversampling hardware. |
| Sampling Rates | ADC: 8–48 kHz; DAC: 32/44.1/48 kHz - supports voice, music, and professional monitoring applications with flexible host synchronization. |
| Analog Performance | DAC THD+N = 0.005% @ 0 dB; ADC THD+N = 0.01% @ –1 dB - meets high-fidelity USB speaker/headset requirements per EIAJ/A-weighted metrics. |
| Dynamic Range | DAC: 93 dB (EIAJ); ADC: 89 dB (A-weighted) - ensures >15-bit effective resolution in real-world noise environments. |
| USB Compliance | Fully compliant with USB 2.0 full-speed spec; certified by USB-IF - guarantees plug-and-play compatibility with Windows/macOS/Linux USB Audio Class 1.0 drivers. |
| S/PDIF Interface | DIN (pin 24) and DOUT (pin 25) support consumer digital audio I/O - enables direct connection to optical/toslink receivers/transmitters without external transceivers. |
| Power Supply | Single 5-V VBUS input; internal 3.3-V regulators for analog/digital domains - simplifies BOM with no external LDOs required for core operation. |
| Package | SSOP-28 (DB), –25°C to +85°C operating range - compatible with standard surface-mount assembly and industrial ambient conditions. |
Pinout & Package
PCM2902BDB is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch, JEDEC MO-153 compliant, and designed for reflow soldering. Thermal resistance θJA = 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN (24) | S/PDIF input | 3.3-V CMOS-level receiver for consumer digital audio; 5-V tolerant - accepts coaxial or optical S/PDIF signals without level translation. |
| DOUT (25) | S/PDIF output | 3.3-V CMOS-level transmitter driving standard S/PDIF loads - connects directly to TOSLINK transmitters or coaxial line drivers. |
| VINL/VINR (12/13) | ADC analog inputs | Single-ended voltage inputs referenced to VCOM (VCCCI/2); 30-kΩ input impedance - interfaces directly with line-level or mic-preamp outputs. |
| VOUTL/VOUTR (16/15) | DAC analog outputs | Single-ended voltage outputs with integrated analog LPF; 0.6×VCCCI peak-to-peak swing - drives headphones or line inputs without external amplification. |
| XTI/XTO (21/20) | Crystal oscillator interface | Supports 12-MHz fundamental-mode crystal (±8 ppm stability) - provides precise timing reference for SpAct™ clock recovery and PLL synthesis. |
| HID0/HID1/HID2 (5/6/7) | HID control inputs | 3.3-V CMOS inputs with internal pulldowns for mute/volume-up/volume-down - enables HID-class USB keyboard-style controls without MCU intervention. |
| SSPND (28) | Suspend flag output | Active-low open-drain signal indicating USB suspend state - allows system-level power management of downstream analog circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ Clock Recovery | Eliminates need for separate audio master clock; recovers low-jitter 44.1/48-kHz clocks directly from USB isochronous packets - reduces EMI and board space vs. traditional PLL+crystal solutions. |
| Integrated S/PDIF Transceiver | DIN/DOUT pins provide bidirectional consumer digital audio I/O - removes requirement for external S/PDIF receiver/transmitter ICs in USB audio hubs and monitors. |
| USB HID Functionality | Three dedicated GPIOs (HID0–HID2) report mute/volume commands to host OS via standard HID descriptor - enables system-level audio control without custom driver development. |
| On-Chip Analog Filters | Antialiasing filter (ADC) and low-pass filter (DAC) included - avoids external RC networks and ensures compliance with USB Audio Class 1.0 spectral mask requirements. |
| Bus-Powered Operation | Draws ≤67 mA at 5 V; suspend current <250 µA - meets USB 2.0 power budget (100 mA) and enables fully self-contained portable audio devices. |
Applications
| USB Audio Interface Box | USB Monitor with Audio |
|---|---|
Use Scenario: Compact desktop device connecting analog microphones/speakers to PC via USB while adding S/PDIF passthrough. IC Role / Device Role / Timing Role: Primary audio codec handling bidirectional conversion, S/PDIF bridging, and USB HID volume control. Use Value: Single-chip integration eliminates separate ADC/DAC/S/PDIF/HID logic, reducing BOM count by ≥4 components and PCB area by >35%. |
Use Scenario: All-in-one display with built-in speakers and microphone supporting plug-and-play audio under Windows/macOS. IC Role / Device Role / Timing Role: Stereo audio endpoint providing synchronized playback/recording with zero-latency HID feedback for on-screen controls. Use Value: Native UAC1.0 compliance ensures driverless operation; SpAct™ jitter performance (<100 ps RMS) prevents audible artifacts in video-conferencing audio. |
| USB Headset Controller | USB Audio Speaker |
Use Scenario: Dual-mode headset supporting analog mic/speaker and digital S/PDIF output to soundbar or AV receiver. IC Role / Device Role / Timing Role: Dual-path audio processor routing analog inputs to USB host and S/PDIF output simultaneously. Use Value: Independent ADC/DAC sample rate handling allows mic capture at 16 kHz while feeding 48 kHz S/PDIF stream - avoids resampling artifacts. |
Use Scenario: Powered speaker system accepting USB audio from laptop and S/PDIF from TV, with physical volume/mute buttons. IC Role / Device Role / Timing Role: Central audio hub managing USB isochronous streaming, S/PDIF decode, and HID button reporting. Use Value: Integrated 96 dB SNR DAC and analog LPF deliver flat 20 Hz–20 kHz response; HID inputs enable direct hardware volume control without MCU firmware. |
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 |
|---|---|---|---|
| PCM2900BDB | Lacks S/PDIF interface (no DIN/DOUT pins); identical ADC/DAC specs and pinout otherwise. | Not suitable for designs requiring digital audio I/O; lower component cost where S/PDIF is unused. | Select PCM2900BDB only if S/PDIF functionality is omitted from system requirements - same layout but missing two critical pins. |
| CY7C65632-56LTXC | USB 2.0 hub controller with no integrated audio codec; requires external ADC/DAC and S/PDIF ICs. | Used in multi-function USB peripherals where audio is secondary; not a functional replacement. | Choose CY7C65632 only when expanding USB port count alongside discrete audio subsystems - not a drop-in or feature-equivalent alternative. |
Compared with PCM2900BDB, PCM2902BDB adds S/PDIF I/O at no cost to analog performance or power consumption; compared with CY7C65632, it integrates full audio signal chain functionality - reducing total component count, layout complexity, and validation effort for dedicated USB audio endpoints.
Availability
PCM2902BDB is available at Aetrix Electronics and suitable for USB audio interface boxes, USB monitors with integrated speakers, and bus-powered USB headsets requiring stable component supply and long-term industrial availability.
Supply support for PCM2902BDB 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 PCM2902BDB belongs to TI's Burr-Brown audio codec product line, engineered specifically for USB-audio-class-compliant, bus-powered stereo audio endpoints with integrated digital I/O and HID control - targeting cost-sensitive, space-constrained consumer and prosumer audio systems.
FAQ
What is the primary function of the PCM2902BDB in a USB audio system?
The PCM2902BDB serves as a complete stereo audio codec with integrated USB 2.0 interface, S/PDIF transceiver, and HID controller. It performs analog-to-digital conversion (ADC) of microphone or line inputs, digital-to-analog conversion (DAC) for speaker/headphone outputs, and bidirectional S/PDIF I/O - all within a single SSOP-28 package. PCM2902BDB handles USB audio class 1.0 protocol natively without firmware, making it ideal for plug-and-play audio peripherals.
Does the PCM2902BDB require an external crystal oscillator?
Yes, the PCM2902BDB requires a 12-MHz fundamental-mode crystal connected between XTI (pin 21) and XTO (pin 20). This crystal provides the base timing reference for the on-chip PLLs and SpAct™ clock recovery engine. The datasheet specifies ±8 ppm stability; no external oscillator module is needed, but the crystal must meet load capacitance and ESR requirements outlined in TI's SLES229 datasheet for PCM2902BDB.
How does the S/PDIF interface on the PCM2902BDB differ from the PCM2900BDB?
The PCM2902BDB includes dedicated DIN (pin 24) and DOUT (pin 25) terminals for S/PDIF I/O, while the PCM2900BDB omits these pins entirely and has no S/PDIF capability. Both share identical ADC/DAC performance, USB functionality, and pinout except for those two signals. PCM2902BDB's DIN supports 3.3-V CMOS input with 5-V tolerance; DOUT drives standard S/PDIF loads directly - no external transceiver is required.
Can the PCM2902BDB operate in USB suspend mode, and what is its current draw?
Yes, the PCM2902BDB supports USB suspend mode with active-low SSPND (pin 28) signaling. In suspend state, supply current drops to ≤250 µA at 5 V - well below the USB 2.0 specification limit of 500 µA for suspended devices. This enables power-conscious designs such as battery-backed USB audio accessories. PCM2902BDB resumes automatically upon USB wakeup signaling without external reset.
What human interface functions does the PCM2902BDB support, and how are they implemented?
The PCM2902BDB implements USB HID functionality through three dedicated inputs: HID0 (mute), HID1 (volume up), and HID2 (volume down), all active-high 3.3-V CMOS signals with internal pulldowns. These connect directly to mechanical buttons or switches and report state changes to the host OS using standard HID usage tables - requiring no custom driver or MCU firmware. PCM2902BDB embeds the HID descriptor in its USB configuration, enabling immediate OS recognition.
PCM2902BDB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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 / 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
PCM2902BDB FAQ
1.How can I place an order for PCM2902BDB through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2902BDB 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 PCM2902BDB reliable?
The price and inventory of PCM2902BDB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2902BDB is usually 5 days.
3.What payment methods are accepted for PCM2902BDB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2902BDB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2902BDB?
PCM2902BDB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2902BDB 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 PCM2902BDB?
For technical support, including PCM2902BDB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2902BDB requirements.
6.How does Aetrix verify that PCM2902BDB is sourced from the original manufacturer or authorized distributors?
All PCM2902BDB 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 PCM2902BDB meets industry standards.
7.What is the process for return or replacement of PCM2902BDB?
All PCM2902BDB units undergo pre-shipment inspection (PSI). If there is an issue with PCM2902BDB, 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 PCM2902BDB part is unused and in its original packaging.
Return procedure for PCM2902BDB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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