Stereo Volume Control with Pushbutton Interface

Provides a Stereo Audio Volume Control Solution Featuring a Debounced Pushbutton Up/Down Interface and LED Indicator Drivers


The MAX5486 dual 40kΩ logarithmic taper volume control features a debounced pushbutton up/down interface that controls volume and balance in audio applications. Each potentiometer has 32 log-spaced tap points with a buffered wiper output to replace mechanical potentiometers. An integrated bias generator provides the required ((VDD + VSS) / 2) bias voltage, eliminating the need for costly external op-amp circuits in unipolar audio applications. A mode-indicator LED output indicates volume or balance control. Five integrated LED drivers indicate volume level or balance settings, depending on the status of the mode indicator.

Use the MAX5486 digital inputs with momentary contact single-pole/single-throw (SPST) pushbutton switches. Each input includes internal debounced circuitry and a pullup resistor to VLOGIC.

The MAX5486 advances the wiper setting once per button push. Maxim's proprietary SmartWiper™ control eliminates the need for a microcomputer to increase the wiper transition rate. The accelerated auto-advance feature provides a wiper-changing rate at 4Hz for holding the control input low for more than 250ms and at 8Hz after 500ms and then at 11Hz after 1000ms (see Table 2 in the full data sheet.)

All of the MAX5486's pushbutton inputs are debounced. The mute input allows a single pushbutton to change between volume control and the -90dB (typ) mute setting. The mode input toggles between volume and balance control. The click-and-pop suppression feature minimizes the audible noise generated by wiper transitions. The typical total harmonic distortion plus noise (THD+N) for the device is 0.003%. The MAX5486 provides a nominal temperature coefficient of 35ppm/°C end-to-end and 5ppm/°C ratiometrically and a nominal resistance of 40kΩ per potentiometer. The MAX5486 is available in a 24-pin TSSOP package and is specified for operation over the -40°C to +85°C extended temperature range.
MAX5486: Typical Operating Circuit MAX5486: Typical Operating Circuit Enlarge+

Key Features

  • Debounced Pushbutton Interface
  • SmartWiper Control Advances Wiper Rate
  • Low-Power Wiper Buffers Provide 0.003% THD
  • Bias Generator Eliminates External Op Amps
  • Five-Segment LED Volume/Balance Indicator
  • Clickless Switching
  • Logarithmic Taper Volume Control with (31) 2dB Steps
  • Single +2.7V to +5.5V or Dual ±2.7V Supply Voltage Operation
  • Power-On Reset to -12dBFS Wiper Position
  • MUTE-bar Function Toggles to 90dB (typ)
  • Low 1µA Shutdown Supply Current
  • 40kΩ End-to-End Fixed Resistance Value
  • Small, 24-Pin TSSOP Package
  • Applications/Uses

    • Desktop Speakers
    • Docking Stations
    • Home-Theater Speakers
    • Portable Media Players
    Part Number Taper POTs Control Interface Wiper Memory Steps REND-TO-END
    Res. Tol.
    Temp. Coeff.
    Wiper Resistance
    ICC @5V
    Package/Pins Budgetary
    typ typ max See Notes
    MAX5486  Log 2 Debounced Pushbutton Up/Down Volatile 32 40 30 50 1 1.4
    $2.13 @1k
    See All Digital Potentiometers (126)
    Pricing Notes:
    This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Technical Documents

    Tutorial 4262 Improve Stereo Performance with Active Biasing
    Tutorial 1828 Audio Gain Control Using Digital Potentiometers

    Quality and Environmental Data

    Product Reliability Reports: MAX5486.pdf 
    Lead-Free Package Tin (Sn) Whisker Reports

    Related Resources