Compact digital pots provide low-cost replacement for variable resistors and trimmers

26 September 2001 Analogue, Mixed Signal, LSI

The AD5200 and AD5201 are low-cost, 256 and 33-position digitally-controlled variable resistor (VR) devices from Analog Devices that perform the same electronic adjustment function as potentiometers and trimmers. Packaged in micro-SOIC packages, their compact size and low-power usage make these digital potentiometers highly suited for use in communications and multimedia applications, as well as in audio/video equipment and PCMCIA cards.

These devices are designed for applications requiring potentiometer adjustments in small, hard-to-reach places. Their compact micro-SOIC package is 1,1 mm high and 3x5 mm in size, making them smaller than mechanical potentiometers. In addition, they offer computer-automated, factory-adjustment and solid-state reliability advantages over more labour-intensive mechanical pots.

Full analog parameter characterisation of differential nonlinearity error, total harmonic distortion, noise, and bandwidth assures complete system information for the rheostat, potentiometer-divider mode circuit connections. They offer standard SPI interfaces, and their end-to-end terminal resistances are available in 10 K and 50 KOhm each, and both parts operate on single power supplies from 2,7 to 5,5 V or dual supply ±2,7 V for ground reference signals. Internal digital level shifting circuitry enables both single-supply and dual-supply operation system adjustments, ideal for ground-referenced AC signal adjustments. Two position resolutions are available: 256-position for 1% accuracy smart-controller adjustment or 33-position for quick- adjustment, alarm-level setting applications.

The AD5200 and AD5201 offer compact, micro-SOIC 10-lead packages.

Analog Data Products SA

(011) 531 1400

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