256-/1024-Position, Digital Potentiometers with Maximum ±1% R-Tolerance Error and 20-TP Memory

The AD5291 and AD5292 are single-channel, 256-/1024-position digital potentiometers that combine industry leading variable resistor performance with nonvolatile memory (NVM) in a compact package. These devices are capable of operating across a wide voltage range, supporting both dual supply operation at ±10.5 V to ±16.5 V and single supply operation at +21 V to +33 V, while ensuring less than 1% end-to-end resistor tolerance error and offering 20-time programmable (20-TP) memory.

The guaranteed industry leading low resistor tolerance error feature simplifies open-loop applications as well as precision calibration and tolerance matching applications.

The AD5291 and AD5292 device wiper settings are controllable through the SPI digital interface. Unlimited adjustments are allowed before programming the resistance value into the 20-TP memory. The AD5291 and AD5292 do not require any external voltage supply to facilitate fuse blow, and there are 20 opportunities for permanent programming. During 20-TP activation, a permanent blow fuse command freezes the wiper position (analogous to placing epoxy on a mechanical trimmer).

The AD5291 and AD5292 are available in a compact 14-lead TSSOP package. The part is guaranteed to operate over the extended industrial temperature range of −40°C to +105°C.

APPLICATIONS

* Mechanical potentiometer replacement

* Instrumentation: gain and offset adjustment

* Programmable voltage-to-current conversion

* Programmable filters, delays, and time constants

* Programmable power supply

* Low resolution DAC replacement

* Sensor calibration

* Single-channel, 256-/1024-position resolution

* 20 kΩ, 50 kΩ, and 100 kΩ nominal resistance

* Maximum ±1% nominal resistor tolerance error (resistor performance mode)

* 20-times programmable wiper memory

* Rheostat mode temperature coefficient: 35 ppm/°C