MAX5486 Stereo Volume Control with Pushbutton Interface General Description Features The MAX5486 dual 40k logarithmic taper volume control Debounced Pushbutton Interface features a debounced pushbutton up/down interface that SmartWiper Control Advances Wiper Rate controls volume and balance in audio applications. Each Low-Power Wiper Buffers Provide 0.003% THD+N potentiometer has 32 log-spaced tap points with a buffered Bias Generator Eliminates External Op Amps wiper output to replace mechanical potentiometers. An inte- Five-Segment LED Volume/Balance Indicator grated bias generator provides the required ((V + V )/2) DD SS bias voltage, eliminating the need for costly external op-amp Clickless Switching circuits in unipolar audio applications. A mode-indicator Logarithmic Taper Volume Control with (31) 2dB LED output indicates volume or balance control. Five inte- Steps grated LED drivers indicate volume level or balance settings, Single +2.7V to +5.5V or Dual 2.7V Supply Voltage depending on the status of the mode indicator. Operation Use the MAX5486 digital inputs with momentary contact Power-On Reset to -12dBFS Wiper Position single-pole/single-throw (SPST) pushbutton switches. MUTE Function Toggles to 90dB (typ) Each input includes internal debounced circuitry and a Low 1A Shutdown Supply Current pullup resistor to V . LOGIC 40k End-to-End Fixed Resistance Value The MAX5486 advances the wiper setting once per but- Small, 24-Pin TSSOP Package ton push. Maxims proprietary SmartWiper control elimi- nates the need for a microcomputer to increase the wiper Ordering Information transition rate. The accelerated auto-advance feature pro- vides a wiper-changing rate at 4Hz for holding the control PART TEMP RANGE PIN-PACKAGE input low for more than 250ms and at 8Hz after 500ms MAX5486EUG+ -40C to +125C 24 TSSOP and then at 11Hz after 1000ms (see Table 2). +Denotes a lead(Pb)-free/RoHS-compliant package. All of the MAX5486s pushbutton inputs are debounced. The mute input allows a single pushbutton to change between volume control and the -90dB (typ) mute setting. Typical Operating Circuit The mode input toggles between volume and balance control. The click-and-pop suppression feature minimizes VDD VLOGIC the audible noise generated by wiper transitions. The typical total harmonic distortion plus noise (THD+N) for V LOGIC the device is 0.003%. The MAX5486 provides a nominal SHDN MODEIND VPEAK temperature coefficient of 35ppm/C end-to-end and (VDD + VSS) / 2 5ppm/C ratiometrically and a nominal resistance of 40k MAX5486 HR per potentiometer. The MAX5486 is available in a 24-pin WR TSSOP package and is specified for operation over the 1M RIGHT INPUT -40C to +85C extended temperature range. LR MAX9761 BIAS (V V ) / 2 DD + SS Applications LEDIND0 LEFT INPUT LL Home-Theater Speakers LEDIND1 Desktop Speakers WL LEDIND2 Portable Media Players LEDIND3 V PEAK HL (V V ) / 2 DD + SS LEDIND4 Docking Stations BIASCAP GND V MUTE UP/BALL DN/BALR MODE SS SmartWiper is a trademark of Maxim Integrated Products, Inc. 19-0672 Rev 1 4/14MAX5486 Stereo Volume Control with Pushbutton Interface Absolute Maximum Ratings SHDN, MODE, MUTE, UP/BALL, and DN/BALR to Average Current into H , L , and W ................................1mA GND .............. -0.3V to the lower of (V + 0.3V and +6V) Maximum Continuous Current into H , L .........................4mA LOGIC H , L , W , BIASCAP, Input and Output Latchup Immunity ...............................200mA BIAS to GND ......-0.3V to the lower of (V + 0.3V and +6V) Continuous Power Dissipation (T = +70C) DD A LEDIND , MODEIND to GND .................................-0.3V to +6V 24-Pin TSSOP (derate 8.3mW/C above +70C) ........657mW V to GND .......................................................-0.3V to +6V Operating Temperature Range ........................... -40C to +85C LOGIC V to GND ............................................................-0.3V to +6V Storage Temperature Range ............................ -60C to +150C DD V to V ...........................................................-6V to +6V Maximum Junction Temperature .....................................+150C DD LOGIC G to V .............................................................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C ND SS V to V ..............................................................-0.3V to +6V DD SS Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (V = +2.7V to +5.5V, V = GND = 0V, 2.7V (V - V ) 5.5V, C = 1F, BIAS = 3k to GND, V = +2.7V to V , DD SS DD SS BIASCAP LOGIC DD V = V - 0.15V, V = (V - V )/2, SHDN = MUTE = V , all LED outputs open, pushbutton interface inactive, V = V H DD L DD SS LOGIC H BIAS + 1V VBIAS = (V - V )/2, T = T to T , unless otherwise specified. Typical values are at T = +25C.) (Note 1) RMS, DD SS A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS RESISTOR LADDER End-to-End Resistance R 40 k Absolute Tolerance 0.25 dB Tap-to-Tap Tolerance (Note 2) 0.1 dB VOLUME CONTROL V = 5V, V = 0V, V = (V /2) + DD SS H DD 1V , V = V /2, 1kHz, tap at top, R = 0.003 RMS L DD L 10k to V = V /2, 20Hz to 20kHz L DD V = 5V, V = 0V, V = (V /2) + DD SS H DD Total Harmonic Distortion Plus THD+N 1V , V = V /2, 1kHz, tap at top, 0.001 % RMS L DD Noise R = to V = V /2, 20Hz to 20kHz L L DD V = 5V, V = 0V, V = (V /2) + DD SS H DD 1.5V , VL = V /2, 1kHz, tap at top, 0.012 RMS DD R = 10k to V = V /2, 20Hz to 20kHz L L DD Channel Isolation V = +2.7V, V = -2.7V, V = GND 100 dB DD SS BIAS Interchannel Matching 0.5 dB Mute Attenuation SHDN = V 90 dB DD Power-Supply Rejection Ratio PSRR Input referred, 217Hz, 100mV on V 72 dB P-P DD H Terminal Capacitance C 5 pF H L Terminal Capacitance C 7 pF L End-to-End Resistance 35 ppm/C Temperature Coefficient Ratiometric Resistance 5 ppm/C Temperature Coefficient Bandwidth, -3dB f C = 50pF 100 kHz CUTOFF W Maxim Integrated 2 www.maximintegrated.com