Voice ICs(260)

IoT Solution(46)


The NAU85L40 is a low power, high quality, 4-channel ADC for microphone array application. The NAU85L40 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 8MHz 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 NAU85L40 operates with analog supply voltages from 1.6V to 2V, while the digital core can operate down to 1.2V to conserve power. Internal register controls enable flexible power saving modes by powering down sub-sections of the chip under software control.


  • 101dB SNR (A-weighted) @ 0dB gain, VDDA=1.8V, Fs = 48 kHz, OSR=128x
  • 91dB 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 48 kHz at 24-bit resolution
  • Two separate microphone bias supplies for low noise microphone biasing
  • Standard audio data bus interfaces: I²S, Left or Right justified, TDM (4 channel), Two’s compliment, MSB first
  • 32-bit audio sub frames
  • Package: Pb free 28L-QFN
  • Temperature range: -40 to 85°