The AD5280/AD5282 are single-channel and dual-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 I2 C-compatible， 2-wire serial data interface. The AD5280/ AD5282 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. 1 Assert shutdown and program the device during power-up， then deassert the shutdown to achieve the desired preset level. 2 The terms digital potentiometer， VR， and RDAC are used interchangeably. The AD5280/AD5282 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. For 3-wire SPI-compatible interface applications， see the AD5260/AD5262 product information on