General Description

The MAX5403/MAX5404/MAX5405 is a family of dual linear taper digital potentiometers. Each device has one 3-terminal potentiometer and one 2-terminal variable resistor (Figure 1). The MAX5403/MAX5404/MAX5405 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 resistors taps as well as a convenient power-on reset (POR) that sets the wiper to the midscale position at power-up. The potentiometer consists of a fixed resistor with a wiper contact that is digitally controlled through a 3-wire serial interface and has 256-tap points. It performs the same function as a discrete potentiometer or variable resistor.

Features

♦ 10-Pin µMAX Small Footprint Package

♦ 256-Tap Positions

♦ Ultra Low 0.1µA Supply Current

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

♦ Low End-To-End Temperature Coefficient:

   35ppm/°C

♦ Low Ratiometric Temperature Coefficient:

   5ppm/°C

♦ Power-On Reset: Wiper Goes to Midscale

   (Position 128)

♦ Glitchless Switching Between Resistor Taps

♦ 3-Wire SPI™ -Interface Compatible

♦ 10kΩ/50kΩ/100kΩ Resistor Values

Applications

   Mechanical Potentiometer Replacement

   Low-Drift Programmable Gain Amplifier (PGA)

   Volume Control

   LCD Screen Adjustment

   Adjustable Voltage Reference

   Programmable Filters, Delays, Time Constant

   Impedance Matching