具有 USB 接口、单声道麦克风输入和立体声耳机输出的音频编解码器
| Number of ADC channels | 1 |
| Number of DAC channels (#) | 2 |
| Analog inputs | 1 |
| Sampling rate (Max) (kHz) | 48 |
| Control interface | H/W |
| Features | USB interface, Mic bias, PGAs, Sidetone |
| Analog outputs | 2 |
- 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
- Analog Performance at VBUS = 5 V:
- 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
- Analog Performance at VBUS = 5.0 V:
- 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
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.
