MAX5456

19-3490; Rev 0; 11/04 www.DataSheet4U.com Stereo Audio Taper Potentiometers with Pushbutton Interface General Description The MAX5456/MAX5457 dual, logarithmic taper digital potentiometers feature a simple pushbutton interface that controls volume and balance in audio applications. Each potentiometer has 32 tap points and replaces mechanical potentiometers. Refer to the MAX5408– MAX5411 data sheet for SPI™ versions of the MAX5456/ MAX5457. Use the MAX5456/MAX5457 digital inputs with momentary contact single-pole/single-throw (SPST) pushbutton switches. Each input includes internal debounce circuitry and a 50kΩ pullup resistor. The MAX5456/MAX5457 advance the wiper setting once per button push. Maxim’s proprietary SmartWiper™ control eliminates the need for a microcomputer to increase the wiper transition rate. Holding the control input low for more than 1s advances the wiper at a rate of 4Hz for 4s and 16Hz per second thereafter. The MAX5456/MAX5457 provide temperature coefficients of 50ppm/°C end-to-end and 5ppm/°C ratiometric and a nominal resistance of 10kΩ per potentiometer. An integrated click/pop suppression feature minimizes the audible noise generated by wiper transitions. The typical total harmonic distortion plus noise (THD+N) for these devices is 0.01%. The MAX5457 features a 3-button interface with a MODE input that toggles between volume- and balancecontrol modes. An LED output indicates volume or balance mode. The MAX5456 features a 4-button interface with sep...