The AD5421 is a 16‑bit digital‑to‑analog converter designed for smart transmitters and industrial process‑control applications. It integrates a regulated voltage output that powers the device and other loop components, supporting loop voltages from 5.5 V to 52 V and output currents from 4 mA to 20 mA (with extended ranges).
The device features a SPI‑compatible serial interface, on‑chip fault alerts, gain and offset adjustment registers, and a built‑in reference. It operates over an industrial temperature range of –40 °C to +105 °C and draws a maximum quiescent current of 300 µA.
| Resolution | 16 bits |
|---|---|
| Loop voltage range | 5.5 V to 52 V |
| Output current range | 4 mA to 20 mA (also 3.8 mA‑21 mA, 3.2 mA‑24 mA) |
| Quiescent current | 300 µA max |
| Temperature range | –40 °C to +105 °C |
| Regulated output voltage | 1.8 V to 12 V |
| Reference input voltage | 2.5 V (external) |
The AD5421 operates with a loop voltage from 5.5 V up to 52 V.
The device draws a maximum quiescent current of 300 µA.
It is rated for industrial temperatures from –40 °C to +105 °C.
The AD5421 provides 4 mA‑20 mA, 3.8 mA‑21 mA, and 3.2 mA‑24 mA selectable ranges.