AD5280 Datasheet

• AD5280: 1 channel
• 256 positions
• +10 V to +15 V single supply; ±5.5 V dual-supply operation
• Fixed terminal resistance: 20 kΩ, 50 kΩ, 200 kΩ
• Low temperature coefficient: 30 ppm/°C
• Power-on midscale preset1
• Programmable reset
• Operating temperature: −40°C to +85°C
• I²C-compatible interface

• Multimedia, video, and audio
• Communications
• Mechanical potentiometer replacement
• Instrumentation: gain, offset adjustment
• Programmable voltage source
• Programmable current source
• Line impedance matching

The AD5280 are single-channel , 256-position, digitally controlled variable resistors (VRs)². The devices perform the same electronic adjustment function as a potentiometer, trimmer, or variable resistor. Each VR 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 20 kΩ, 50 kΩ, or 200 kΩ has a 1% channel-to-channel matching tolerance. The nominal temperature coefficient of both parts is 30 parts per million/ degrees centigrade (ppm/°C). Another key feature is that the parts can operate up to +15 V or ±5 V.

Wiper position programming defaults to midscale at system power-on. When powered, the VR wiper position is programmed by an I²C-compatible, 2-wire serial data interface. The AD5280 feature sleep mode programmability. This allows any level of preset in power-up and is an alternative to a costly EEPROM solution. Both parts have additional programmable logic outputs that enable users to drive digital loads, logic gates, LED drivers, and analog switches in their system.

The AD5280 are available in thin, surface-mounted 14-lead TSSOP and 16-lead TSSOP. All parts are guaranteed to operate over the extended industrial temperature range of −40°C to +85°C.