Dallas Semiconductor is introducing a nonvolatile (NV), triple digital resistor. This DS3904 device is suited 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 Ω to 20 kΩ (typ) resistance range with a high-impedance option that allows the resistor to function as a digital switch. The DS3904 operates over a 2,7 V to 5,5 V supply, with communication achieved through a 2-wire serial interface. An address pin allows two DS3904s to operate on the same bus. The DS3904 comes in 8-lead microSOP package.
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