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Nuvoton NAU8501

24-bit stereo audio ADC

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Key Features

The NAU8501 is a low power, high quality audio input system for portable applications.

In addition to precision 24-bit stereo ADCs, the NAU8501 integrates a broad range of additional functions to simplify implementation of complete audio systems. The NAU8501 includes low-noise stereo differential high gain microphone inputs with wide range programmable amplifiers, separate line inputs, and an analogue bypass/sidetone line level stereo output.

Advanced on-chip digital signal processing includes a limiter/ALC (Automatic Level Control), 5-band equalizer, notch filter, and a high-pass filter for speech optimisation and wind noise reduction. The digital interface can operate as either a master or a slave. Additionally, an internal fractional-N PLL is available to accurately generate any audio sample rate clock for the ADCs derived using any suitable system clock from 8MHz through 33MHz.

The NAU8501 operates with analogue supply voltages from 2.5V to 3.6V, while the digital core can operate as low as 1.7V to conserve power. Internal control registers enable flexible power conserving modes, shutting down or reducing power in sub-sections of the chip under software control.

The NAU8501 is specified for operation from -40°C to +85°C, and is available with full automotive AEC-Q100 and TS16949 qualification. It is packaged in a cost effective, space efficient 32-lead QFN package.


  • ADC: 90dB SNR and -80dB THD ("A" weighted)
  • Stereo differential input microphone amplifiers
  • Very wide range programmable input amplifier
  • Stereo line inputs with gain options and mixing
  • Stereo line outputs with gain control and mute
  • On-chip high resolution fractional-N PLL
  • Integrated DSP with specific functions:
    • 5-band equaliser
    • High pass filter / wind noise reduction
    • Automatic level control / limiter
    • Programmable notch filter
  • Serial control interfaces with read/write capability
  • Standard audio interfaces: PCM and I²S
  • Supports any sample rate from 8kHz to 48kHz
  • Read/write control register interface


  • Audio recording devices
  • Security systems
  • Video and still cameras
  • Enhanced audio inputs for SOC products
  • Audio input accessory products
  • Gaming systems
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