Digital pot interface controls volume and balance

Sunnyvale, Calif. — Maxim Integrated Products Inc.'s dual, 32-tap, audio-taper digital potentiometers feature a debounced, push-button interface for volume and balance control.

Consequently, the MAX5456 and MAX5457 digital potentiometers don't require an external microcontroller, GPIO, or any debounce circuitry for the control interface, the company said. An integrated algorithm separately controls volume and balance. The pots can be used in audio applications for fading and balancing stereo signals, stereo blending and mixing and for stereo volume control.

The potentiometers are available with a 3- or 4-wire push-button interface that features Maxim's proprietary SmartWiper rapid-advance wiper-control system. Without 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, according to Maxim.

The MAX5456 and MAX5457 pots also feature a mute function that sets all wipers to maximum attenuation when activated, and returns the wipers to their previous position when deactivated. Each potentiometer is said to include integrated suppression circuitry that ensures clickless switching between wiper transitions.

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Available in a 4 x 4 mm TQFN package, the MAX5456 and MAX5457 contain two10 kilohm resistor strings that offer ratiometric and end-to-end temperature coefficients as low as 5 ppm/°C and 35 ppm/°C, respectively. These digital pots operate from a 2.7 V to 5.25 V single supply and require less than 0.5 microamps in standby.

Pricing for the MAX5456 and MAX5457 digital pots begins at $1.44 (1000-up, FOB USA). Click here for the MAX5456 and MAX5457 data sheets.

Maxim Integrated Products , 1-800-998-8800,

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