AD8403AR10

The AD8403AR10 is a quad-channel, 256-position digital potentiometer (VR) device from Analog Devices. It performs the same electronic adjustment function as a mechanical potentiometer or variable resistor. Each part contains a fixed resistor with a wiper contact that taps the fixed resistor value at a point determined by the digital code loaded into the controlling serial input register.

Key electrical specifications include a nominal resistance of 10 kΩ between A and B terminals, with a channel-to-channel matching tolerance of ±1%. It operates on a single supply voltage ranging from 2.7V to 5.5V and features a low power shutdown current of less than 5 μA. The device supports a 3-wire, SPI-compatible serial data input with a 10 MHz update data loading rate.

The AD8403AR10 is qualified for automotive applications and is suitable for mechanical potentiometer replacement, programmable filters, delays, time constants, volume control, panning, line impedance matching, and power supply adjustment. The device is available in a 24-lead package and supports surface mount.

This digital potentiometer offers a unique switching circuit that minimizes glitches inherent in traditional switched resistor designs, avoiding make-before-break or break-before-make operation. The nominal temperature coefficient is 500 ppm/°C.