DS3904U-020+

The DS3904/DS3905 contain three nonvolatile (NV) lowtemperature coefficient, variable digital resistors. Eachresistor has 128 user-selectable positions. Additionally,the DS3904/DS3905 have a high-impedance setting thatallows each resistor to function as a digital switch. TheDS3904/DS3905 can operate over a 2.7V to 5.5V supplyvoltage range, and communication with the device isachieved through a 2-wire serial interface. Address pinsallow multiple DS3904/DS3905s to operate on the sametwo-wire bus. The DS3904 has one address pin, allowingtwo DS3904s to share the bus, while the DS3905has three address pins, allowing up to eight DS3905s toshare a common bus. The low-cost and small size of theDS3904/DS3905 make them ideal replacements for conventionalmechanical trimming resistors.

Key Features

• Three 20kΩ, 128-Position Linear Digital Resistors
• Resistor Settings are Stored in NV Memory
• Each Resistor has a High-Impedance Setting for Switch Operation to Control Digital Logic
• Low Temperature Coefficient
• 2-Wire Serial Interface
• 2.7V to 5.5V Operating Range
• -40°C to +85°C Industrial Temperature
• Packaging: 8-Pin µSOP for DS3904, 10-pin µSOP for DS3905

Application

• Cell Phones/PDAs
• Fibre Optic Transceiver Modules
• Portable Electronics
• Power-Supply Calibration
• Test Equipment