NAU85L42YG is a low-power, high-performance quad-channel audio ADC designed for high-quality audio capture in microphone array applications. It is suitable for systems requiring multiple microphone inputs, flexible audio routing, and efficient low-power operation.

NAU85L42YG integrates microphone preamplifiers, programmable gain control, and a fractional FLL. The device supports both AMIC and DMIC input configurations, with up to four DMIC devices supported through the MIC2 and MIC3 channel pairs. The integrated FLL enables accurate generation of standard audio sample rates via commonly available system clock sources ranging from 8 kHz to 50 MHz.

NAU85L42YG captured audio data can be output through either two I²S data output lines or a single TDM/PCM data output, providing flexible interface options for different host processors or audio systems. The device supports multiple supply domains, including VDDA from 1.62V to 1.98V, MICVDD and VDDB at 3.3V, and VDDC down to 1.2V for improved power efficiency.

Target Applications:

• Audio Mixers
• Smart Cockpit
• Smart Speaker
• Conference Device
• Microphone Array Systems

Key Features:

• ADC Feature
  • SNR (A-weighted): 106dB @ 0dB gain
  • THD+N: -92dB @ 0dB gain, 0.8Vrms differential input
• Audio Input
  • Programmable analog gain -1dB ~ +36dB
  • Programmable digital gain with +0.125dB steps
  • 4-channel AMIC configurable on MIC1, MIC2, MIC3 and MIC4
  • 4-channel DMIC configurable on MIC2 and MIC3
  • Supports sample rates from 8 kHz ~ 192 kHz at 24-bit resolution
• Advance / Control Feature
  • Low Latency: 77μs@Fs=48KHz minimum low latency (decimation) with four configurable filters
  • Digital Audio Interface: I²S / PCM / TDM (4 ADCs) up to 32 bits
  • Communication Interface: I²C with read/write capability
• Operating Characteristics
  • Voltage range (VDDA): +1.62V ~ +1.98V
  • Voltage range (VDDB): +1.62V ~ +1.98V
  • Voltage range (VDDC): +1.62V ~ +3.6V
  • Voltage range (VDDMIC): +3.0V ~ +3.6V
  • Temperature range: -40°C ~ +105°C
• Package
  • QFN-32 (4 x 4 mm²)
• Evaluation Board ： NL-NAU85L42