Texas Instruments PCM2900BDBR

Overview

PCM2900BDBR from Texas Instruments is a single-chip, USB-compliant stereo audio codec with integrated 16-bit delta-sigma ADC and DAC, full-speed USB transceiver, on-chip clock generator (12 MHz input), and human interface device (HID) support for mute/volume controls. It delivers THD+N = 0.01% (ADC) and 0.005% (DAC), SNR = 89 dB (ADC) and 96 dB (DAC), and operates from a single 5 V bus supply in SSOP-28 package - used in USB headsets and audio interface boxes.

For engineers reviewing the PCM2900BDBR datasheet, PCM2900BDBR pinout, PCM2900BDBR application, or PCM2900BDBR equivalent, this page provides verified technical context, exact pin functions, real-world audio system integration details, and validated alternative parts for USB audio codec selection.

Technical Context

The PCM2900BDBR implements TI's SpAct™ architecture to recover low-jitter audio clocks directly from USB packet data, enabling independent playback and record sampling rates without external crystal oscillators beyond the required 12 MHz reference. Its USB protocol controller is fully compliant with USB 2.0 and certified by USB-IF, operating exclusively in adaptive mode for playback and asynchronous mode for recording.

It integrates analog antialiasing and low-pass filters, digital decimation/interpolation filters with ±0.05 dB passband ripple (ADC) and ±0.1 dB (DAC), stop-band attenuation of 65 dB (ADC) and –43 dB (DAC), and supports HID volume/mute control via three dedicated CMOS inputs (HID0–HID2) with internal pulldowns.

Key Specifications

Pinout & Package

PCM2900BDBR is housed in a 28-pin SSOP (DB) package with 0.64 mm pitch, rated for –25°C to +85°C ambient operation. All power and ground pins are segregated per functional domain (analog codec, PLL, oscillator, digital, USB transceiver) to minimize noise coupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCM2902BDBR and CM108B, PCM2900BDBR uniquely balances 16-bit audio fidelity, integrated HID, bus-powered operation, and SpAct™ clock recovery - making it optimal for USB headsets and compact audio interfaces where analog quality and plug-and-play usability are critical.

Availability

PCM2900BDBR is available at Aetrix Electronics and suitable for USB audio headsets, USB monitor audio subsystems, and USB audio interface boxes requiring stable component supply across industrial and consumer production cycles.

Supply support for PCM2900BDBR 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 decades of leadership in precision audio signal chain solutions.

The PCM2900B series belongs to TI's Burr-Brown audio codec product line, designed specifically for USB-audio-class-compliant, bus-powered stereo audio endpoints requiring minimal external components and zero-host-driver customization.

FAQ

What is the primary function of the PCM2900BDBR in a USB audio system?

The PCM2900BDBR serves as a complete stereo USB audio codec, integrating 16-bit delta-sigma ADC and DAC, full-speed USB transceiver, SpAct™ clock recovery, HID interface, and analog filtering. It enables plug-and-play stereo audio capture and playback over USB without external controllers or drivers - all within a single SSOP-28 package. The PCM2900BDBR handles USB enumeration, isochronous streaming, and hardware volume/mute reporting natively.

Does the PCM2900BDBR require an external crystal oscillator?

Yes, the PCM2900BDBR requires a 12 MHz fundamental-mode crystal connected between XTI (pin 21) and XTO (pin 20). This crystal feeds the on-chip PLL that generates the 96 MHz master clock for SpAct™ operation and audio sampling. The device does not support external clock input or internal RC oscillation - the 12 MHz crystal is mandatory for correct USB audio timing and jitter performance. The PCM2900BDBR datasheet specifies ±0.008 MHz tolerance (11.994–12.008 MHz).

How does the PCM2900BDBR handle different sampling rates for ADC and DAC simultaneously?

The PCM2900BDBR uses TI's SpAct™ architecture to independently recover playback and record clocks from USB isochronous packet timing, enabling true asynchronous dual-rate operation. For example, it can record at 44.1 kHz while playing back at 48 kHz - a capability confirmed in the functional block diagram and electrical specifications. This eliminates resampling artifacts and simplifies host-side audio routing in mixed-sample-rate environments. The PCM2900BDBR supports all standard rates: ADC (8–48 kHz), DAC (32/44.1/48 kHz).

Can the PCM2900BDBR be used in battery-powered portable devices?

The PCM2900BDBR is designed for bus-powered operation from USB 5 V (VBUS), drawing up to 67 mA during active audio streaming. While it lacks native low-voltage operation (e.g., 3.3 V only), it can be used in portable devices with a regulated 5 V supply derived from batteries - provided the power source sustains ≥4.35 V and ≥100 mA peak current. Its 250 µA suspend-mode current supports USB suspend states, but battery runtime must account for the 5 V conversion overhead. The PCM2900BDBR is not optimized for direct battery connection like low-power codecs.

What are the key differences between PCM2900BDBR and PCM2902BDBR?

The PCM2902BDBR adds S/PDIF input (DIN, pin 24) and output (DOUT, pin 25) while sharing identical USB, ADC, DAC, HID, and pinout functionality with the PCM2900BDBR. Both use the same SSOP-28 DB package and operate across –25°C to +85°C. The PCM2902BDBR draws higher supply current (352 mA vs 280 mA) due to S/PDIF circuitry and is not drop-in compatible - DIN/DOUT replace TEST0/TEST1 pins. Use PCM2900BDBR when optical I/O is unnecessary to reduce cost, power, and layout complexity.