Dual 64-Position Nonvolatile Digital Potentiometer with Buffered Output

The DS3908 contains two nonvolatile (NV) digital potentiometers with programmable-gain amplifiers buffering the wiper outputs. The potentiometer position and amplifier gain are controlled through an I²C-compatible serial bus. The DS3908 operates in both 3.3V and 5V systems and features a write-protect pin that locks the position of the potentiometers and gain registers. Up to eight DS3908s can be placed on a single I²C bus.

Applications

* Cell Phones/PDAs * PIN Diode Biasing * Portable Electronics * Power Supply Calibration

* Two 64-Position Linear Taper Potentiometers

* Integral Wiper Buffering Amplifiers With Selectable Gains of 1V/V, 2V/V, or 4V/V

* 100kΩ Potentiometer End-to-End Resistance

* Low Potentiometer Temperature Coefficient

* Nonvolatile Wiper and Gain Storage

* I²C-Compatible Interface

* Write-Protect Pin Prevents Accidental Field Reprogramming

* 3V to 5.5V Supply Voltage Range

* -40°C to +85°C Operating Temperature Range

* 14-Pin TDFN Package