This document is the functional block diagram and feature introduction of AD1851/AD1861
The AD1851 (16‑bit) and AD1861 (18‑bit) are monolithic PCM audio DACs offering high‑performance audio playback. They include a voltage reference, output amplifier, DAC, serial‑to‑parallel register and support optional linearity trim for low‑distortion operation. Both devices operate from a single +5 V supply and are pin‑compatible with AD1856/AD1860.
The datasheet provides electrical specifications, absolute maximum ratings, pin descriptions, grounding recommendations, and recommended power‑supply decoupling. Application notes show typical connection diagrams with digital filter chips and outline dimensions for DIP and SOIC packages.
| Signal‑to‑Noise Ratio | 107 dB (min) – 110 dB (max) |
|---|---|
| Power Dissipation | 100 mW typical |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Output Current (Voltage mode) | Up to +8 mA |
| Current Output Mode | +1 mA |
| Operating Temperature Range | -25 °C to +70 °C |
The AD1851 supports a maximum clock input frequency of 12.5 MHz.
Both devices operate from a +5 V supply with a recommended range of 4.75 V to 5.25 V.
Typical power dissipation is 100 mW.
Yes, they share the same 16‑pin DIP and SOIC pinout as the AD1856 and AD1860.