1 Features

1• On-Chip USB Interface:

– With Full-Speed Transceivers

– Fully Compliant With USB 2.0 Specification

– Certified By USB-IF

– Partially Programmable Descriptors

– Adaptive Isochronous Transfer for Playback

– Asynchronous-Isochronous Transfer for

Record

– Bus Powered

• 16-Bit Delta-Sigma ADC and DAC

• Sampling Rate:

– 8, 11.025, 16, 22.05, 32, 44.1, or 48 kHz

• On-Chip Clock Generator:

– With Single 6-MHz Clock Source

• Mono ADC with Microphone Input

– Analog Performance at VBUS = 5 V:

– THD+N: 0.01%

– SNR: 92 dB

– Dynamic Range: 90 dB

– Decimation Digital Filter

– Passband Ripple: ±0.05 dB

– Stop-Band Attenuation: –65 dB

– Single-Ended Voltage Input

– Antialiasing Filter Included

– Digital HPF Included

– Microphone Bias, Microphone Amplifier, and

Input PGA

• Stereo DAC With Headphone Output

– Analog Performance at VBUS = 5.0 V:

– THD+N: 0.01% (R L > 10 kΩ)

– THD+N: 0.02% (RL = 32 Ω)

– SNR: 92 dB

– Dynamic Range: 90 dB

– PO: 13 mW (RL = 32 Ω)

– PO: 25 mW (RL = 16 Ω)

– Oversampling Digital Filter

– Passband Ripple: ±0.1 dB

– Stop-Band Attenuation: –43 dB

– Single-Ended Voltage Output

– Analog LPF Included

– Sidetone PGA, Output PGA, and HP

Amplifier

• Multifunctions:

– Suspend, Playback, and Record Status Flag

– Microphone Amplifier, Mute, and Gain Control

• Pop/Click Noise-Free

• Single Power-Supply: 5 V Typical (VBUS)

• Package: 32-Pin TQFP

2 Applications

• USB Headset

• USB Headphone

• USB Speaker

• USB Featured Consumer Audio Product

• USB Audio Interface Box

• USB Monitor

• Video Conference System

3 Description

The PCM2912A is the Texas Instruments single-chip,

USB stereo audio codec with a USB, 2.0-compliant,

full-speed protocol controller and an analog front-end

(AFE) function for headset applications.

The USB protocol controller works with no software

code, but USB descriptors can be modified on request. The PCM2912A employs SpAct™

architecture, TI’s unique system that recovers the

audio clock from USB packet data. On-chip analog

PLLs with SpAct enables independent playback and record sampling rates with low clock jitters.