Dual 64-Position Nonvolatile Digital Potentiometer with Buffered Output

The DS3908 features two nonvolatile (NV), low temperature-coefficient, variable digital potentiometers with 64 user-selectable positions.

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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.
DS3908: Typical Operating Circuit DS3908: Typical Operating Circuit Enlarge+

Key Features

  • 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


  • Cell Phones/PDAs
  • PIN Diode Biasing
  • Portable Electronics
  • Power Supply Calibration
Product Reliability Reports: DS3908.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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