256-Tap, µPoT Low-Drift, Digital Potentiometer

The MAX5402 µPoT digital potentiometer is a 256-tap variable resistor with 10kΩ total resistance in a tiny 8-pin µMAX® package. This device functions as a mechanical potentiometer, consisting of a fixed resistor string with a digitally controlled wiper contact. It operates from +2.7V to +5.5V single-supply voltages and uses an ultra-low 0.1µA supply current. This device also provides glitchless switching between resistor taps, as well as a convenient power-on reset (POR) 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.

The MAX5402 serves well in applications requiring digitally controlled resistors, including adjustable voltage references and programmable gain amplifiers (PGAs). A nominal end-to-end resistor temperature coefficient of 35ppm/°C makes this part suitable for use as a variable resistor in applications such as low-tempco adjustable gain and other circuit configurations. This device is guaranteed over the extended industrial temperature range (-40°C to +85°C).

Applications

* Adjustable Voltage Reference * Low-Drift Programmable-Gain Amplifiers * Mechanical Potentiometer Replacements

* Small Footprint, 8-Pin µMAX Package

* Ultra-Low 100nA Supply Current

* +2.7V to +5.5V Single-Supply Operation

* 256 Tap Positions

* Low Ratiometric Temperature Coefficient 5ppm/°C

* Low End-to-End Resistor Temperature Coefficient 35ppm/°C

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

* Glitchless Switching Between the Resistor Taps

* 3-Wire SPI™-Interface Compatible

* 10kΩ Resistor Value