Dual, Audio, Log Taper Digital Potentiometers

The MAX5408-MAX5411 dual, logarithmic taper digital potentiometers, with 32-tap points each, replace mechanical potentiometers in audio applications requiring digitally controlled resistors. The MAX5408/MAX5410 are dual potentiometers with one wiper per potentiometer. The MAX5409/MAX5411 are dual potentiometers with two wipers per potentiometer (see Functional Diagram). An SPI™-compatible serial interface controls the wiper positions. The MAX5408- MAX5411 have a factory-set resistance of 10kΩ per potentiometer. A zero-crossing detect feature minimizes the audible noise generated by wiper transitions. The MAX5408-MAX5411 have nominal temperature coefficients of 35ppm/°C end-to-end and 5ppm/°C ratiometric. The MAX5408-MAX5411 are available in 16-pin QSOP and 16-pin thin QFN packages and are specified over the extended temperature range (-40°C to +85°C).

Applications

* Fading and Balancing Stereo Signals * Mechanical Potentiometer Replacements * Stereo Volume Control

* Log Taper with 2dB Steps Between Taps

* 32-Tap Positions for Each Wiper

* Small 16-Pin QSOP/QFN Packages

* Single-Supply Voltage Operation

* +2.7V to +3.6V (MAX5408/MAX5409)

* +4.5V to +5.5V (MAX5410/MAX5411)

* Low 0.5µA Standby Supply Current

* Zero-Crossing Detection for Clickless Switching

* Mute Function to -90dB

* 10kΩ Fixed Resistance Value

* 3-Wire SPI-Compatible Serial Data Interface

* Power-On Reset: Wiper Goes to Maximum Attenuation

* Digital Output for Readback and Daisy-Chaining Capabilities