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.