特性 Features

? Multichannel high-performance ADC:
? 2-channel analog microphones or line-in
? 4-channel digital PDM microphones
? Up to 2 analog and up to 2 digital microphone channels

? ADC line and microphone differential input performance:
? Dynamic range (DR):
? 123-dB, dynamic range enhancer (DRE) enabled
? 113-dB, DRE disabled

? THD+N: –95 dB

? ADC channel summing mode, DR performance:
? 116-dB, DRE disabled, 2-channel summing

? ADC input voltage:
? Differential, 2-VRMS full-scale inputs
? Single-ended, 1-VRMS full-scale inputs

? ADC sample rate (fS) = 8 kHz to 768 kHz
? Programmable channel settings:
? Channel gain: 0 dB to 42 dB, 0.5-dB steps
? Digital volume control: –100 dB to 27 dB
? Gain calibration with 0.1-dB resolution
? Phase calibration with 163-ns resolution

? Programmable microphone bias or supply voltage generation
? Low-latency signal processing filter selection
? Programmable HPF and biquad digital filters
? Automatic gain controller (AGC)
? Voice activity detection (VAD)
? I2C control interface
? Integrated high-performance audio PLL
? Automatic clock divider setting configurations
? Audio serial data interface:
? Format: TDM, I2S, or left-justified (LJ)
? Word length: 16 bits, 20 bits, 24 bits, or 32 bits
? Master or slave interface

? Single-supply operation: 3.3 V or 1.8 V
? I/O-supply operation: 3.3 V or 1.8 V
? Power consumption for 1.8-V AVDD supply:
? 9.5 mW/channel at 48-kHz sample rate