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NAU85L40B - Quad Audio ADC

General Description

The NAU85L40B is a low power, high quality, 4-channel ADC for microphone array application.

The NAU85L40B integrates programmable gain preamplifiers for quad differential microphones, significantly reducing external component requirements.

Key Features

  • 101dB SNR (A-weighted) @ 0dB gain, VDDA=1.8V, Fs = 48 kHz, OSR=128x.
  • 92dB THD+N @ 0dB gain, 0.8Vrms in, VDDA=1.8V, Fs=48 kHz, OSR=128x.
  • -124dB Channel Crosstalk @ 0dB gain, 0.9Vrms in, VDDA=1.8V, Fs=48 kHz, OSR=128x.
  • Integrated programmable gain microphone amplifier.
  • On-chip FLL.
  • I2C Serial control interface with read/write capability.
  • Supports sample rates from 8 kHz to 96 kHz at 24bit resolution.
  • Two separate microphone bias supplies for low noise micr.

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NAU85L40B Quad Audio ADC with Integrated FLL and Microphone Preamplifier GENERAL DESCRIPTION The NAU85L40B is a low power, high quality, 4-channel ADC for microphone array application. The NAU85L40B integrates programmable gain preamplifiers for quad differential microphones, significantly reducing external component requirements. A fractional FLL is available to accurately generate any audio sample rate using any commonly available system clock source from 8KHz through 33MHz. Audio data can be directed to two I2S data out lines or onto a single time division multiplexed (TDM) PCM data output. The NAU85L40B operates with analog supply voltages from 1.6V to 2V, while the digital core can operate down to 1.2V to conserve power.