This document describes the features and characteristics of the ADR420/ADR421/ADR423/ADR425 series of ultraprecision, low noise, XFET voltage references.
The ADR42x series are ultraprecision XFET voltage references offering low noise, low temperature coefficient, and high output current in 8‑lead SOIC or MSOP packages. They are intended for precision data acquisition, medical instruments, optical network control, and industrial process control.
The document lists detailed electrical specifications for each model, pin‑function descriptions, absolute maximum ratings, thermal resistance, and ESD precautions, enabling designers to select and integrate the appropriate reference into their circuits.
| Output Voltage (A‑grade) ADR420 | 2.045 V – 2.051 V |
|---|---|
| Low Noise (0.1 Hz‑10 Hz) ADR420 | 1.75 pV p‑p |
| Temperature Coefficient | 3 ppm/°C |
| Quiescent Current | 0.5 mA max |
| Supply Voltage Headroom | 2 V |
| Load Regulation | 70 ppm/mA |
| Operating Temperature Range | ‑40 °C to +125 °C |
| Maximum Supply Voltage (Absolute Rating) | 18 V |
The ADR425 provides a typical 5.00 V output; A‑grade devices range from 4.994 V to 5.006 V and B‑grade devices from 4.998 V to 5.002 V.
The absolute maximum supply voltage is 18 V.
The TRIM terminal can be used to adjust the output voltage over a +0.5 % range without affecting other performance parameters.