The AD1981HD Rev. 0 audio codec supports high-definition audio with up to 24-bit 48 kHz audio sample rates and features two DAC channels and two ADC channels, as well as greater than 90 dB dynamic range. It also includes a digital beep and analog PC beep pass-through, integrated headphone amplifiers, selectable microphone and line inputs, a full analog mixer, legacy CD and auxiliary inputs, and external amplifier power-down (EAPD). The device is packaged in a 48-pin, lead-free LQFP package.
The AD1981HD audio codec from Analog Devices provides two DAC channels (16‑, 20‑, or 24‑bit) and two ADC channels (16‑ or 20‑bit) with sample rates from 8 kHz up to 48 kHz. It features integrated headphone amplifiers, jack‑retasking, S/PDIF output, and advanced power‑management options.
The datasheet includes functional block diagrams, pin configurations, absolute maximum ratings, power‑supply specifications, and detailed jack‑presence detection methods, along with ordering information and mechanical dimensions.
| DAC resolution | 24 Bits |
|---|---|
| ADC resolution | 20 Bits |
| Sample rate | 48 kHz |
| Output impedance (headphone disabled) | 300 Ω |
| Input impedance | 20 kΩ |
| Total harmonic distortion (DAC, line out) | -92 dB |
| Signal‑to‑noise ratio (line in to line out) | 85 dB |
It supports HD audio sample rates of 8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz, 44.1 kHz and 48 kHz.
The device provides two DAC channels and two ADC channels.
The codec offers a dynamic range greater than 90 dB.