The ADAU1781 is a low noise stereo codec with SigmaDSP processing core, supporting 24-bit stereo audio ADC and DAC, 400mW speaker amplifier (into 8Ω load), programmable SigmaDSP audio processing core, wind noise detection and filtering, enhanced stereo capture (ESC), dynamics processing, equalization and filtering, volume control and mute, sampling rates from 8kHz to 96kHz, stereo pseudo differential microphone input, optional stereo digital microphone input pulse-density modulation (PDM), stereo line output, PLL supporting a range of input clock rates, analog and digital I/O, 1.8V to 3.3V, software control via SigmaStudio graphical user interface, software-controllable, clickless mute, software register and hardware pin standby mode, 32-lead, 5mm×5mmLFCSP.
The ADAU1781 is a low‑noise, low‑power 24‑bit stereo audio codec designed for battery‑powered applications. It combines a 24‑bit ADC and DAC, a 400 mW speaker amplifier, programmable SigmaDSP audio processing, and flexible I²C/SPI serial interfaces. The device supports sampling rates from 8 kHz to 96 kHz and offers both analog and digital microphone inputs, a stereo line output, and a dedicated beep input.
The datasheet provides detailed specifications for the record and output sides, power‑supply requirements, and performance parameters such as dynamic range, signal‑to‑noise ratio, and total harmonic distortion. It also includes functional block diagrams, register maps, and revision history for engineers integrating the codec into cameras, audio recorders, or other embedded systems.
| ADC Resolution | 24 Bits |
|---|---|
| DAC Resolution | 24 Bits |
| Supply Voltage (AVDD) | 3.3 V (typical) |
| Speaker Output Power | 400 mW into 8 Ω |
| Sampling Rate Range | 8 kHz – 96 kHz |
All analog and I/O supplies (AVDD, AVDD1, AVDD2, IOVDD) are 3.3 V, with a typical range of 1.8 V to 3.65 V.
The codec supports both I²C and SPI serial control buses, and the serial audio bus can be programmed for I²S, left‑justified, right‑justified, or TDM mode.
The integrated speaker driver is rated for an 8 Ω load delivering up to 400 mW.
Yes, an optional stereo digital microphone input using pulse‑density modulation (PDM) is supported.