1FEATURES

23· 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, 48 kHz

· On-Chip Clock Generator:

– With Single 6-MHz Clock Source

· Mono ADC with Microphone Input

– Analog Performance at V BUS = 5 V:

– THD+N: 0.01%

– SNR: 92 dB

– Dynamic Range: 90 dB

– Decimation Digital Filter

– Pass-Band 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% (RL > 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

– Pass-Band 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 Typ (VBUS)

· Package: 32-Pin TQFP

APPLICATIONS

· USB Headset

· USB Headphone

· USB Speaker

· USB Featured Consumer Audio Product

· USB Audio Interface Box

· USB Monitor

· Video Conference System

DESCRIPTION

The PCM2912 is the Texas Instruments single-chip,

USB stereo audio CODEC with USB 2.0-compliant

full-speed protocol controller and analog front end (AFE) function for headset application. The USB

protocol controller works with no software code, but

USB descriptors can be modified on request(1). The

PCM2912 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 rate with

low clock jitters.