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.
●Features
●• 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% (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
● – 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
●Applications
●• USB Headset
●• USB Headphone
●• USB Speaker
●• USB Featured Consumer Audio Product
●• USB Audio Interface Box
●• USB Monitor
●• Video Conference System
