32-Tap Audio Logarithmic Taper Digital Potentiometer

The MAX5407 SOT-PoT™ is a logarithmic taper digital potentiometer with 32 tap points that has 1dB steps between taps. This device is ideal for audio applications, such as volume control and fading/balancing audio signals.

The MAX5407 consists of a resistor string and CMOS switches that are digitally controlled through a simple 2-wire serial interface. This device performs the same function as a mechanical potentiometer. The device has a fixed end-to-end resistance of 20kΩ and features zero-crossing detection to minimize the audible noise generated by the wiper transitions.

This device has nominal resistor temperature coefficients of 35ppm/°C end-to-end and 5ppm/°C ratiometric. The MAX5407 is available in a space saving 8-pin SOT23 package and is guaranteed from -40°C to +85°C.

Applications

* Audio Volume Control * Fading/Balancing Audio Signals * Mechanical Potentiometer Replacements

* Miniature 3mm x 3mm 8-Pin SOT23 Package

* Logarithmic Taper with 1dB Steps Between Taps

* 32 Tap Positions

* Low 0.35µA Supply Current

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

* Zero-Crossing Detection to Minimize Audible Clicks During Wiper Transitions

* Simple Up/Down 2-Wire Serial Data Interface

* Power-On Reset

* Wiper Goes to Maximum Attenuation (Lowest Tap Position)

* 20kΩ End-to-End Resistance