Maxim's new MAX5456/7 are claimed to be the industry's first dual, 32-tap, audio-taper digital potentiometers that feature a debounced, simple pushbutton interface for volume and balance control. These devices do not require an external microcontroller, GPIO, or any debounce circuitry for the control interface. An integrated algorithm separately controls volume and balance. The MAX5456/7 are available with a 3- or 4-wire pushbutton interface that features Maxim's proprietary SmartWiper rapid-advance wiper-control system. Without needing a microcontroller, SmartWiper advances the wiper at a rate of 4 Hz when the switch is closed for one second, and 16 Hz when the switch is closed for four seconds. The ICs also feature a mute function and each potentiometer includes integrated suppression circuitry that ensures 'clickless' switching between wiper transitions. Available in a 4 x 4 mm TQFN package, they contain two 10 kΩ resistor strings that offer ratiometric and end-to-end temperature coefficients of 5 ppm/°C and 35 ppm/°C, respectively. They operate from a 2,7 to 5,25 V single supply and draw less than 0,5 μA in standby.
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