آی سی  دارای 4 عدد پتانسیومتر دیجیتال 1 کیلو اهمی با ارتباط سریال 3 سیمه نوع SPI می باشد.

FEATURES
256-position variable resistance device
Replaces 1, 2, or 4 potentiometers
1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Power shutdown—less than 5 μA
3-wire,SPI-compatible serial data input
10 MHz update data loading rate
2.7 V to 5.5 V single-supply operation
Qualified for automotive applications

APPLICATIONS
Mechanical potentiometer replacement
Programmable filters, delays, time constants
Volume control, panning
Line impedance matching
Power supply adjustment


GENERAL DESCRIPTION
The AD8400/AD8402/AD8403 provide a single-, dual-, or quad-channel, 256-position, digitally controlled variable resistor (VR) device.
These devices perform the same electronic adjustment function as a mechanical potentiometer
or variable  resistor.
The AD8400 contains a single variable resistor in the compact SOIC-8 package.
The AD8402 contains two independent  variable resistors in space-saving SOIC-14
surface-mount  packages.
The AD8403 contains four  independent variable  resistors in 24-lead PDIP, SOIC, and TSSOP
packages.
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. 
The resistance between the wiper and either endpoint of the fixed resistor varies linearly with respect to the digital code transferred into the VR latch. Each variable resistor offers a completely
programmable value of resistance between the A terminal and the wiper or the B terminal and the wiper. The fixed A-to-B terminal resistance of 1 kΩ, 10 kΩ, 50 kΩ, or 100 kΩ has a ±1%
channel-to-channel matching tolerance with a nominal temperature coefficient of 500 ppm/°C. A unique switching circuit minimizes the high glitch inherent in traditional switched resistor designs, avoiding any make-before-break or break-before-make operation.