RENCODEB RENCODEA MODE MUTE GND MAX5440 Stereo Volume Control with Rotary Encoder Interface General Description Features The MAX5440 dual, 40k logarithmic taper volume con- Logarithmic Taper Volume Control with (31) 2dB trol features a debounced up/down interface for use with Steps a simple rotary encoder without using a microcontroller Low-Power Wiper Buffers Provide 0.003% THD (C). Each potentiometer has 32 log-spaced tap points Single +2.7V to +5.5V or Dual 2.7V Supply Voltage with a buffered wiper output and replaces mechanical potentiometers. An integrated bias generator provides Operation the required ((V + V )/2) bias voltage, eliminating DD SS Low 0.5A Shutdown Supply Current the need for costly external op-amp circuits in unipolar Integrated Bias Voltage Generator audio applications. A mode-indicator LED output specifies volume or balance control. Five integrated LED drivers Five-Segment LED Volume/Balance Indicator indicate volume level or balance settings, depending on Clickless Switching the status of the mode indicator. 40k End-to-End Fixed Resistance Value The MAX5440 includes debounced pushbutton inputs for mute and mode. The mute input allows a single pushbut- Mute Function Toggles to -90dB (typ) ton to change between volume control and the -90dB (typ) Power-On Reset to -12dBFS Wiper Position mute setting. The mode input toggles between volume and balance control. A click-and-pop suppression feature Ordering Information minimizes the audible noise generated by wiper transi- PART TEMP RANGE PIN-PACKAGE tions. The MAX5440 provides a nominal temperature MAX5440EAG+ -40C to +85C 24 SSOP coefficient of 35ppm/C end-toend and 5ppm/C, ratio- metrically. The MAX5440 is available in a 24-pin SSOP +Denotes a lead(Pb)-free/RoHS-compliant package. package and is specified for operation over the -40C to Note: For leaded version, contact factory. +85C extended temperature range. Typical Operating Circuit Applications V V DD LOGIC Stereo Volume Control Desktop Speakers Multimedia Docking Stations V LOGIC Set-Top Boxes SHDN MODEIND V PEAK (V V ) / 2 DD + SS MAX5440 Pin Configuration H1 W1 TOP VIEW V LOGIC 1 24 GND RIGHT INPUT L1 RENCODEB 2 23 MODEIND HEADPHONE MIDBIAS RENCODEA 3 22 LEDIND4 DRIVER (VDD + VSS) / 2 MUTE LEDIND3 4 21 MAX5440 LEDIND0 LEFT INPUT L0 20 LEDIND2 MODE 5 LEDIND1 W0 SHDN 6 19 LEDIND1 LEDIND2 LEDIND3 GND 7 18 LEDIND0 H0 LEDIND4 H0 8 17 H1 BIAS V SS 16 L1 L0 9 15 W1 W0 10 11 14 V MIDBIAS SS 12 13 V BIAS DD ROTARY ENCODER SSOP 19-0542 Rev 3 4/14MAX5440 Stereo Volume Control with Rotary Encoder Interface Absolute Maximum Ratings SHDN, MUTE, RENCODEA, RENCODEB, V to GND .............................................................-3V to +0.3V SS and MODE to GND ..........................-0.3V to (V + 0.3V) Input and Output Latchup Immunity ...............................200mA LOGIC H , L , and W to V ............................ -0.3V to (V + 0.3V) Continuous Power Dissipation (T = +70C) SS DD A LEDIND , MODEIND to GND .............-0.3V to (V + 0.3V) 24-Pin SSOP (derate 12.3mW/C above +70C) .....987.7mW LOGIC MIDBIAS, BIAS to V ..................(V - 0.3V) to (V + 0.3V) Operating Temperature Range ........................... -40C to +85C SS SS DD V to GND ........................................ -0.3V to (V + 0.3V) Junction Temperature ......................................................+150C LOGIC DD V to GND ............................................................-0.3V to +6V Storage Temperature Range ............................ -60C to +150C DD V to V ..............................................................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C 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 = V = 0, 2.7V (V - V ) 5.5V, V = +2.7V to V , V = V , V = V /2, DD SS GND DD SS LOGIC DD H DD L DD T = T to T , unless otherwise specified. Typical values are at T = +25C.) (Note 1) A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS End-to-End Resistance R 36 40 52 k Absolute Tolerance 0.25 dB Tap-to-Tap Tolerance 0.1 dB V = (V / 2) + 1V , 1kHz tap at top, H DD RMS 0.004 R = J to V = V / 2, 20Hz to 20kHz L L DD V = (V / 2) + 1.5VRMS, 1kHz tap at top, H DD 0.006 R = J to V = V / 2, 20Hz to 20kHz L L DD Total Harmonic Distortion Plus V = 5V,V = 0V, V = 1.5V, DD SS L THD+N % Noise V = (V / 2) + 1V , 1kHz tap at top, 0.004 H DD RMS R = 10k to V , 20Hz to 20kHz L MIDBIAS V = 5V,V = 0V, V = 5V, DD SS L V = (V / 2) + 1.5V , 1kHz tap at top, 0.006 H DD RMS R = 10k to V , 20Hz to 20kHz L MIDBIAS Channel Isolation 100 dB Interchannel Matching 0.5 dB Mute Attenuation SHDN = V 90 dB DD Power-Supply Rejection Ratio PSRR Input referred, 217Hz, 100mV on V -60 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 Ratiometric Resistance 5 ppm/C Bandwidth, -3dB f C = 33pF 100 kHz CUTOFF W Output Noise e 20Hz to 20kHz 3.2 V n RMS WIPER BUFFER Output Voltage Swing V R = 10k to V V - 0.2 V O L MIDBIAS DD Output Current 3 mA Output Resistance R 1 10 OWB DC Offset -14 2 +14 mV INTEGRATED BIAS GENERATOR (V + (V + (V + DD DD DD Output Voltage I = 1mA V ) / 2 V ) V ) / 2 V LOAD SS SS SS - 30mV / 2 + 30mV Maxim Integrated 2 www.maximintegrated.com