Dual, 256-Tap, Up/Down Interface, Digital Potentiometers

The MAX5450—MAX5455 are a family of dual digital potentiometers that perform the same function as a mechanical potentiometer or variable resistor. The MAX5451/MAX5453/MAX5455 have two 3-terminal potentiometers and the MAX5450/MAX5452/MAX5454 have two 2-terminal variable resistors. The MAX5450—MAX5455 operate from a +2.7V to +5.5V single-supply voltage and use an ultra-low supply current of 0.1µA. These devices consist of two fixed resistors each with 256 digitally-controlled wiper contacts. The convenient power-on reset (POR) sets the wiper to midscale position at power-up and the easy-to-use up/down interface allows glitchless switching between resistor taps. Six inputs control the 14-pin MAX5451/MAX5453/MAX5455 potentiometers. Four inputs control the 10-pin MAX5450/MAX5452/MAX5454 variable resistors.

The MAX5450—MAX5455 are ideal for applications requiring digitally-controlled resistors. Three resistance values are available: 10kΩ, 50kΩ, and 100kΩ. An end-to-end resistor temperature coefficient of 35ppm/°C and a ratiometric temperature coefficient of 5ppm/°C make the MAX5450—MAX5455 excellent choices for adjustable gain circuit requiring low-temperature drift.

The MAX5450—MAX5455 are available in 10-pin µMAX® and 14-pin TSSOP packages. Each device is guaranteed over the extended—industrial temperature range (-40°C to +85°C).

Applications

* Adjustable Linear Regulators * Adjustable Voltage Reference * Impedance Matching * LCD Screen Adjustment * Low-Drift Programmable-Gain Amplifier (PGA) * Mechanical Potentiometer Replacement * Programmable Filters, Delays, Time Constants * Volume Control

* Small-Footprint Packages

* 10-Pin µMAX (MAX5450/MAX5452/MAX5454)

* 14-Pin TSSOP (MAX5451/MAX5453/MAX5455)

* 256-Tap Positions

* Independent Up/Down Potentiometer Controls (MAX5451/MAX5453/MAX5455)

* Ultra-Low 0.1µA Supply Current

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

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

* Power-On Reset Sets Wiper to Midscale (Position 127)

* Glitchless Switching Between the Resistor Taps

* 10kΩ, 50kΩ, 100kΩ Resistance Values