DALLAS Semiconductor, represented by Arrow Electronics , has introduced the DS3904 low-cost, nonvolatile (NV), triple digital resistor.
This device is ideal for implementing automated calibration of PC power supplies and other electronics currently using mechanical trimming resistors.
Replacing mechanical trim devices with the DS3904 reduces manual assembly steps and increases calibration speed and accuracy, thus reducing manufacturing costs and improving quality.
The DS3904 contains three NV low-temperature-coefficient digital resistors with 128 user-selectable positions per resistor. Each resistor has a 425 ohms to 20 kilohm (typ) 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.
The DS3904 is available in a space-saving 8-lead microSOP package.