AD1981B is a codec chip from Analog Devices, it supports 20-bit PCM DAC, 3 analog line-level stereo inputs, dual MIC inputs, high quality CD input, mono output
This handbook details the AD1981B AC'97 compatible audio codec, covering its functional blocks, integrated headphone amplifier, and configurable features such as S/PDIF output and programmable equalizer. It includes electrical specifications, power‑down states, and environmental limits.
The document also lists all control registers, timing diagrams, package dimensions, and ordering options, making it a comprehensive reference for designers integrating the codec into audio systems.
| Sample Rate | 48 kHz (typical) |
|---|---|
| Analog Supply Voltage | 5.0 V |
| Digital Supply Voltage | 3.3 V |
| DAC Resolution | 16 bits |
| Dynamic Range | >90 dB |
| Package Type | 48‑Lead LQFP (ST‑48) |
The codec provides a dynamic range of greater than 90 dB.
The device is offered in a 48‑lead low‑profile quad flat package (LQFP, ST‑48).
The codec supports variable sample rates up to 48 kHz, with a range from 7.04 kHz to 48 kHz.