Texas Instruments PCM2902BDBR

Overview

PCM2902BDBR from Texas Instruments is a single-chip, USB-compliant stereo audio codec with integrated S/PDIF interface, 16-bit delta-sigma ADC/DAC, and full-speed USB 2.0 transceiver. It delivers THD+N = 0.01% (ADC) and 0.005% (DAC), SNR = 89 dB (ADC) and 96 dB (DAC), and supports sampling rates up to 48 kHz for playback and recording in USB audio speaker, headset, and monitor applications.

For engineers reviewing the PCM2902BDBR datasheet, PCM2902BDBR pinout, PCM2902BDBR application, or PCM2902BDBR equivalent, this page provides verified technical context, SSOP-28 package mapping, S/PDIF-enabled audio signal chain integration details, and validated alternative options for USB audio subsystem design.

Technical Context

The PCM2902BDBR implements TI's SpAct™ architecture to recover audio clock directly from USB packet data, enabling low-jitter asynchronous playback and adaptive recording without external crystal for USB timing. Its dual PLL system separates ADC and DAC clock domains, supporting independent sampling rates (e.g., 44.1 kHz record + 48 kHz playback).

It integrates a complete analog front-end with on-chip antialiasing (ADC) and low-pass (DAC) filters, digital high-pass filter (HPF), decimation/interpolation filters, and a 12-MHz crystal oscillator interface. 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.

Key Specifications

Pinout & Package

PCM2902BDBR is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, optimized for space-constrained USB audio devices. Thermal resistance θ_JA = 100°C/W supports operation up to +85°C ambient without forced airflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar stereo USB audio codec applications.

Compared with PCM2900BDBR, PCM2902BDBR adds S/PDIF I/O at no penalty to analog performance or power; compared with CY7C68013A-56PVXC, it delivers turnkey USB audio compliance with zero firmware effort but less architectural flexibility.

Availability

PCM2902BDBR is available at Aetrix Electronics and suitable for USB audio speaker, USB headset, and USB monitor audio hub applications requiring stable component supply and long-term industrial availability.

Supply support for PCM2902BDBR 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 PCM2902BDBR belongs to TI's Burr-Brown audio codec product line, designed specifically for cost-sensitive, USB-native audio peripherals requiring integrated analog front-end, digital audio I/O, and plug-and-play host compatibility.

FAQ

What is the primary function of the PCM2902BDBR in a USB audio system?

The PCM2902BDBR serves as a complete stereo audio codec with integrated USB 2.0 interface and S/PDIF transceiver. It handles analog-to-digital conversion (mic/line input), digital-to-analog conversion (headphone/speaker output), USB audio class streaming, HID volume/mute control, and bidirectional S/PDIF I/O - all within a single SSOP-28 package. PCM2902BDBR eliminates the need for discrete USB controllers, converters, and digital audio PHYs in entry-to-mid-tier audio peripherals.

Does the PCM2902BDBR require an external crystal oscillator?

Yes, the PCM2902BDBR requires a 12.000 MHz ±8 ppm fundamental-mode crystal connected between XTI (pin 21) and XTO (pin 20). This crystal feeds the on-chip oscillator circuit that generates the 96 MHz PLL clock for USB and audio subsystems. PCM2902BDBR does not support external clock input or ceramic resonator alternatives per datasheet specifications.

How does the PCM2902BDBR handle USB audio synchronization?

The PCM2902BDBR uses TI's proprietary SpAct™ architecture to recover the audio sample clock directly from USB isochronous packet timing, enabling true asynchronous operation. This eliminates clock domain conflicts between USB host and audio subsystem, allowing independent ADC and DAC sampling rates (e.g., 44.1 kHz record + 48 kHz playback) with low jitter (<100 ps RMS typical). PCM2902BDBR does not rely on feedback from the host for clock stability.

Can the PCM2902BDBR operate without external analog filtering components?

Yes - PCM2902BDBR integrates analog antialiasing filters on the ADC inputs and reconstruction low-pass filters on the DAC outputs. These on-chip filters meet EIAJ/IEC-60958 requirements for CD-quality audio, enabling direct connection to microphones, line sources, headphones, and speakers without external RC networks or op-amp filters. PCM2902BDBR's VCOM pin (14) provides the common-mode reference for single-ended interfacing.

What is the role of the HID0, HID1, and HID2 pins on the PCM2902BDBR?

HID0 (pin 5), HID1 (pin 6), and HID2 (pin 7) are dedicated 3.3-V CMOS inputs that report mute, volume-up, and volume-down key presses directly to the USB host via the HID class endpoint - no custom driver or firmware is needed. These pins feature internal pulldowns and are electrically isolated from the audio data path; they do not affect ADC/DAC operation or S/PDIF functionality. PCM2902BDBR maps them to standard USB HID usage codes for immediate OS recognition.