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Dallas resistor IC replaces mechanical trimmers

Posted: 27 Feb 2003 ?? ?Print Version ?Bookmark and Share

Keywords:dallas semiconductor? ds3904? digital resistor ic? trimming potentiometer? trimmer potentiometer?

The DS3904 non-volatile (NV), triple digital resistor IC from Dallas Semiconductor is designed to replace mechanical trim devices and implement the automatic calibration of PC power supplies.

Available in an 8-lead microSOP casing, the device features three low TCR digital resistors with 128 user-selectable positions per resistor. Each resistor has a 425-ohm to 20-kiloohm resistance range with a high-impedance option that allows the resistor to function as a digital switch.

The DS3904 operates over a 2.7V to 5.5V supply, with communication achieved through a 2-wire serial interface. An address pin allows two DS3904s to operate on the same bus. Prices start at 70 cents in 1,000-up unit quantities.

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