Thursday, March 17, 2016

Digital Potentiometer

DS1669 Digital Potentiometer

digital potentiometer variable potentiometer circuit schematic
Control audio power amplifier volume, LCD contrast, frequency, etc. by using two buttons instead of a common potentiometer. This circuit explains how we do it with Maxim’s DS1669 IC. This IC is very popular and is widely used because it is a potentiometer that never wears down.

By using S1 and S2 pushbuttons you can adjust the resistance. C1 is only a 0.1uF ceramic capacitor. You can use the datasheet of DS1669 to get more detailed information.

– Replaces mechanical variable resistors
– Electronic interface provided for digital as well as manual control
– Wide differential input voltage range between 4.5 and 8V
– Wiper position is maintained in the absence of power
– Low-cost alternative to mechanical controls
– Applications include volume, tone, contrast, brightness, and dimmer control
– Available in 8-pin SOIC and 8-pin DIP packages
– Standard resistance values for Dallastat:

DS1669-10 ~ 10 kΩ

DS1669-50 ~ 50 kΩ

DS1669-100 ~ 100 kΩ

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