AD8402AR50

Product Summary

The AD8402AR50 is a 2-channel digital potentiometer. It provides a single, dual or quad channel, 256 position digitally controlled variable resistor (VR) device. These devices perform the same electronic adjustment function as a potentiometer or variable resistor. The AD8402AR50 contains two independent variable resistors in space saving SO-14 surface mount package. Each part contains a fixed resistor with a wiper contact that taps the fixed resistor value at a point determined by a 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-beforemake operation. The AD8402AR50 is available in both surface mount (SO-14) and the 14-lead plastic DIP package, while the AD8403 is available in a narrow body 24-lead plastic DIP and the 24-lead surface mount package. The AD8402AR50 is also offered in the 1.1 mm thin TSSOP-14/TSSOP-24 package for PCMCIA applications. All parts are guaranteed to operate over the extended industrial temperature range of -40°C to +85°C. The AD8402AR50 can be used in mechanical potentiometer replacement, programmable filters, delays, time constants, volume control, panning line impedance matching, and power supply adjustment.

Parametrics

AD8402AR50 absolute maximum ratings: (1)VDD to GND: –0.3 V, +8 V; (2)VA, VB, VW to GND: 0 V, VDD; (3)AX–BX, AX–WX, BX–WX: ±20 mA; (4)Digital Input and Output Voltage to GND: 0 V, +8 V; (5)Operating Temperature Range: –40°C to +85°C; (6)Maximum Junction Temperature (TJ max): +150°C; (7)Storage Temperature: –65°C to +150°C; (8)Lead Temperature (Soldering, 10 sec): +300°C.

Features

AD8402AR50 features: (1)256 Position; (2)Replaces 1, 2 or 4 Potentiometers; (3)1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ; (4)Power Shut Down—Less than 5 μA; (5)3-Wire SPI Compatible Serial Data Input; (6)10 MHz Update Data Loading Rate; (7)+2.7 V to +5.5 V Single-Supply Operation; (8)Midscale Preset.

Diagrams