Audio codeck NAU8822/NAU88C22

NAU88C22 Audio Codec Board — Overview

A compact, open-hardware board built around the NAU88C22 stereo audio codec, designed for advanced DIYers and audio developers seeking good-quality, flexible audio signal handling.

Key Parameters:

• 24-bit stereo ADC & DAC (SNR 89 dB, THD -84 dB DAC / -78 dB ADC)

• Headphone driver: 40 mW @ 16 Ω

• Speaker driver: up to 1 W @ 8 Ω (BTL)

• Sample rates: 8–192 kHz, fractional PLL for flexible clocking

• Supply: 2.5–3.6V (analog), 1.7–3.6V (digital), up to 5V (speaker out)

Core Features:

• Differential mic preamps with programmable gain and mic bias

• Multiple analog inputs: mic, line-in, AUX; flexible analog mixing/routing

• Advanced DSP: 5-band EQ, 3D audio, ALC, limiter, DRC, notch/high-pass filters

• Digital audio I/O: I2S/PCM (master/slave), I²C/SPI control

• Real-time signal and DSP status monitoring

On PCB:

• Low-noise, low-dropout 3.3V linear regulator for clean analog supply

• I²C voltage level translator — bus can be driven by both 3.3V and 5V microcontrollers

• All NAU88C22 signals available on goldpin headers for easy prototyping and interfacing

Summary:
This board is an excellent platform for prototyping, experimenting with audio signal chains, and building custom hi-fi or embedded audio solutions. Full control over analog and DSP features, universal connectivity, and careful power design make it a powerful tool for audio hardware engineers and enthusiasts.

https://www.nuvoton.com/resource-files/NAU8822LDataSheetRev1.9.pdf

https://pastebin.com/gNc9mrZ7 - how to set pll on this chip because AI can not do that for you.