AD8400ARZ50

The AD8400ARZ50 is a single-channel, 256-position digital potentiometer from Analog Devices, designed to replace mechanical potentiometers. It offers a programmable resistance value that varies linearly with the digital code loaded into its serial input register.

Key features include a power shutdown mode consuming less than 5 μA, a 3-wire SPI-compatible serial data input, and a 10 MHz update data loading rate. The device operates from a single supply voltage ranging from 2.7 V to 5.5 V. The fixed resistance values available are 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ, with a channel-to-channel matching tolerance of ±1% and a nominal temperature coefficient of 500 ppm/°C.

This digital potentiometer is suitable for applications such as mechanical potentiometer replacement, programmable filters, delays, time constants, volume control, panning, line impedance matching, and power supply adjustment. It is supplied in a compact SOIC-8 surface-mount package, making it ideal for space-constrained designs.

The AD8400 series provides a digitally controlled variable resistance function, performing the same electronic adjustment as a mechanical potentiometer. Its unique switching circuit minimizes glitches inherent in traditional switched resistor designs.