General Description

The MAX5400/MAX5401 digital potentiometers offer 256-tap SOT-PoT™ digitally controlled variable resistors in tiny 8-pin SOT23 packages. Each device functions as a mechanical potentiometer, consisting of a fixed resistor string with a digitally controlled wiper contact. They operate from +2.7V to +5.5V single-supply voltages and use an ultra-low supply current of 0.1µA. These devices also provide glitchless switching between resistor taps, as well as a convenient power on reset that sets the wiper to the midscale position at power-up. A low 5ppm/°C ratiometric temperature coefficient makes it ideal for applications requiring low drift.

Features

♦ Miniature 8-Pin SOT23 (3mm x 3mm)

♦ 256 Tap Positions

♦ Ultra-Low 0.1µA Supply Current

♦ Single-Supply Operation: +2.7V to +5.5V

♦ Low Ratiometric Temperature Coefficient: 5ppm/°C

♦ Power-On Reset: Wiper Goes to Midscale (Position 128)

♦ Glitchless Switching Between the Resistor Taps

♦ 3-Wire SPI™-Interface Compatible

♦ 50kΩ/100kΩ Resistor Values

Applications

  Mechanical Potentiometer Replacement

  Low-Drift PGAs

  Adjustable Voltage References