AD1981BL is an audio codec produced by Analog Devices. It supports AC ’97 2.3 standard, supports S/PDIF output, 20-bit data format, supports 48 kHz and 44.1 kHz sampling rate, integrated stereo headphone amplifier, variable sampling rate audio, external audio power-down control, >90 dB dynamic range, stereo full-duplex codec, 20-bit PCM DAC, 3 analog line-level stereo inputs for line-in, AUX and CD, mono line-level phone input, dual MIC input, built-in programmable preamplifier, high quality CD input with ground sense, mono output for speakerphone or internal speaker power management support, 48-lead LQFP package, lead free available.
The AD1981BL is an AC'97‑compatible stereo audio codec featuring a 20‑bit PCM DAC, integrated headphone amplifier, multiple line‑level and microphone inputs, and S/PDIF output. It supports variable sample rates from 7.04 kHz to 48 kHz with a dynamic range greater than 90 dB.
The document lists electrical specifications, timing parameters, power‑down states, pin functions, and register maps, along with package dimensions and ordering information for the 48‑lead LQFP version.
| Sample Rate | 48 kHz |
|---|---|
| Input Voltage (LINE_IN, AUX, CD, PHONE_IN) | 0.707 Vrms |
| Input Impedance | 20 kΩ |
| Power Supply Range | 3.0 – 3.47 V |
| DAC Resolution | 16 Bits |
| Dynamic Range | >90 dB |
The device operates with analog and digital supplies between 3.0 V and 3.47 V.
It supports variable sample rates up to 48 kHz (full‑duplex from 7.04 kHz to 48 kHz).
Three stereo line‑level inputs are available: LINE_IN, AUX, and CD.
It is offered in a 48‑lead low‑profile Quad Flat Package (LQFP) ST‑48.