Digital potentiometers cut price of non-volatile memory
25 February 2004
Analogue, Mixed Signal, LSI
Analog Devices' AD517x family features compact 'set and forget' digital potentiometers with the ability to lock their resistance to a chosen value upon command. The AD517x family replaces mechanical trimmers in 'set and forget' factory adjustments, saving both time and labour. The devices' one-time programmable feature permanently sets the wiper position. They feature an I2C-compatible interface for reading/writing the wiper position, and for initiating the 'fuse blow' command that permanently sets the resistance value.
AD517x potentiometers are available in 2,5, 5, 10, 50, and 100 kΩ end-to-end resistances. Rated for operation from -40 to +125°C, they feature a low 35-ppm/°C temperature coefficient. Drawing no more than 5 µA on 2,7 V to 5,5 V power supplies, they are useful in high stability battery-operated applications. They meet the high EMI resistance standards of the automobile industry.
The family includes the OTP (one-time programmable), 64-position AD5171. The 256-position AD5170 offers a 'second chance' option-a parallel set of fusible links that allow users two opportunities to set the final device resistance. The 256-position AD5172 and AD5173 feature two OTP potentiometers per device. The AD5173 adds two address-decode bits, enabling it to handle as many as four devices on a single bus.
For more information contact Analog Data Products, a division of Avnet Kopp, 011 809 6100.
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