EVALUATION KIT AVAILABLE MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface General Description Features The MAX5456/MAX5457 dual, logarithmic taper digital (cid:1) SmartWiper Control Provides Accelerated Wiper potentiometers feature a simple pushbutton interface Motion that controls volume and balance in audio applications. (cid:1) Debounced Pushbutton Interface with Internal Each potentiometer has 32 tap points and replaces Pullup Resistors mechanical potentiometers. Refer to the MAX5408– (cid:1) Logarithmic Taper with 2dB Steps Between Taps MAX5411 data sheet for SPI versions of the MAX5456/ MAX5457. (cid:1) Single +2.7V to +5.5V or Dual ±2.7V Supply Operation Use the MAX5456/MAX5457 digital inputs with momen- tary contact single-pole/single-throw (SPST) pushbutton (cid:1) Low 0.5µA Standby Supply Current switches. Each input includes internal debounce cir- (cid:1) Clickless Switching cuitry and a 50kΩpullup resistor. (cid:1) 10kΩEnd-to-End Fixed Resistance Value The MAX5456/MAX5457 advance the wiper setting once (cid:1) Mute Function to -90dB (typ) per button push. Maxim’s proprietary SmartWiper™ con- trol eliminates the need for a microcomputer to increase (cid:1) Power-On Reset to -12dB Wiper Position the wiper transition rate. Holding the control input low for (cid:1) 32 Tap Positions for Each Wiper more than 1s advances the wiper at a rate of 4Hz for 4s (cid:1) Small 16-Pin QSOP Package and 16Hz per second thereafter. The MAX5456/MAX5457 provide temperature coeffi- cients of 50ppm/°C end-to-end and 5ppm/°C ratiomet- Ordering Information ric and a nominal resistance of 10kΩper potentiometer. An integrated click/pop suppression feature minimizes PART TEMP RANGE PIN-PACKAGE the audible noise generated by wiper transitions. The MAX5456EEE+ -40oC to +85oC 16 QSOP typical total harmonic distortion plus noise (THD+N) for MAX5457EEE+ -40oC to +85oC 16 QSOP these devices is 0.01%. +Denotes a lead(Pb)-free/RoHS-compliant package. The MAX5457 features a 3-button interface with a Note: For leaded version, contact factory. MODEinput that toggles between volume- and balance- control modes. An LED output indicates volume or bal- ance mode. The MAX5456 features a 4-button interface with separate inputs for up and down volume controls and left and right balance controls. The MAX5456/MAX5457 is available in a 16-pin QSOP Pin Configurations packages and specified over the extended (-40°C to +85°C) temperature range. TOP VIEW Applications + Stereo Volume Control DN/BAL0 1 16 VDD Fading and Balancing Stereo Signals UP/BAL1 2 15 VLOGIC Stereo Blending and Mixing MODE 3 14 GND MODE_IND 4 MAX5457 13 VSS H0 5 12 H1 L0 6 11 L1 W0 7 10 W1 Typical Application Circuits and Selector Guide appear at SHDN 8 9 MUTE end of data sheet. QSOP SmartWiper is a trademark of Maxim Integrated Products, Inc. Pin Configurations are continued at end of data sheet. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. 19-3490; Rev 2; 8/12

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface ABSOLUTE MAXIMUM RATINGS (MAX5456) SHDN, MUTE, VOLUP, VOLDN, Peak Current into H_, L_, and W_.......................................±1mA BAL_to GND.....................................-0.3V to (VLOGIC+ 0.3V) Average Current into H_, L_, and W_..............................±500µA (MAX5457) SHDN, MUTE, UP/BAL1, DN/BAL0, MODE, Input and Output Latchup Immunity...............................±200mA MODE_IND to GND...........................-0.3V to (VLOGIC+ 0.3V) Continuous Power Dissipation (TA= +70°C) H_, L_, and W_ to VSS ..............................-0.3V to (VDD+ 0.3 V) 16-Pin QSOP (derate 8.3mW/°C above +70°C)........666.7mW VDDto GND..............................................................-0.3V to +6V Operating Temperature Range...........................-40°C to +85°C VDDto VSS................................................................-0.3V to +6V Junction Temperature......................................................+150°C VLOGICto GND.........................................................-0.3V to +6V Storage Temperature Range.............................-60°C to +150°C VLOGICto VSS...........................................................-0.3V to +6V Lead Temperature (soldering, 10s).................................+300°C VSSto GND............................................................-3.0V to +0.3V Soldering Temperature (reflow).......................................+260°C 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 (VDD= VLOGIC= +2.7V to +5.5V, VSS= 0V, GND = 0V, VH_ = VDD, VL_ = VSS, TA= TMINto TMAX. Typical values are at TA= +25°C, unless otherwise specified.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS End-to-End Resistance R Figures 1, 2 7 10 13 kΩ Maximum Bandwidth fCUTOFF From H_ to W_, CLOAD = 10pF 100 kHz Absolute Ratio Tolerance No lo ad at the outpu t of the wi p er , W _ = -6 dB ±0.25 dB Tap-to-Tap Tolerance ±0.1 dB VDD = 5V, VH_ = (VDD / 2) + 1VRMS, 0.01 f = 1kHz, tap = -6dB, VL_ = VDD / 2, RL = ∞ Total Harmonic Distortion Plus Noise THD+N VDD = 3V, VSS = 0V, VL_ = 1.5V, % VH_ = 1.5V + 1VRMS, f = 1kHz, RL = 10kΩ to 0.23 (VDD / 2), CL = 5pF, tap = -6dB Channel-to-Channel Isolation -100 dB Interchannel Matching f = 20Hz to 20kHz, tap = -6dB ±0.5 dB Mute Attenuation -90 dB Power-Supply Rejection Ratio PSRR -80 dB Wiper Resistance RW 1000 1700 Ω Wiper Capacitance CW 10 pF H Terminal Capacitance CH 5 pF L Terminal Capacitance CL 7 pF End-to-End Resistance 50 ppm/°C Temperature Coefficient Ratiometric Resistance 5 ppm/°C Temperature Coefficient Output Noise en 20Hz to 20kHz 0.95 µVRMS PUSHBUTTON CONTACT INPUTS (UP/BAL1, DN/BAL0, MUTE, VOLUP, VOLDN, BAL0, BAL1, MODE) Internal Pullup Resistor RPULLUP 32 50 65 kΩ Single Pulse-Width Input tlPW Figure 5 22.5 ms Repetitive Input Pulse High Time tHPW Figure 5 40 ms Timeout Period tWS Click/pop suppression inactive 32 ms 2 Maxim Integrated

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface ELECTRICAL CHARACTERISTICS (continued) (VDD= VLOGIC= +2.7V to +5.5V, VSS= 0V, GND = 0V, VH_ = VDD, VL_ = VSS, TA= TMINto TMAX. Typical values are at TA= +25°C, unless otherwise specified.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS First Autoincrement Point 1 s First Autoincrement Rate 4 Hz Second Autoincrement Point 4 s Second Autoincrement Rate 16 Hz DIGITAL INPUTS (VLOGIC > 4.5V) Input High Voltage VIH 2.4 V Input Low Voltage VIL 0.8 V Input Leakage Current Inputs floating ±1 µA Input Capacitance 5 pF DIGITAL INPUTS (VLOGIC < 4.5V) 0.7 x Input High Voltage VIH V VL OGIC 0.3 x Input Low Voltage VIL V VL OGIC Input Leakage Current Inputs floating ±1 µA Input Capacitance 5 pF POWER SUPPLIES Supply Voltage VDD 2.7 5.5 V Negative Power Supply VSS -2.7 0 V Supply-Voltage Difference VDD - VSS 5.5 V Active Supply Current IDD (Note 2) 100 µA VD D = +5 .5V, VS S = 0V, VL OGIC = 2.7V (N o te 3) 2 10 Standby Supply Current ISTBY µA VLOGIC = VDD = +2.7V, VSS = -2.7V (Note 3) 0.5 1 Shutdown Supply Current ISHDN (Note 4) 1 µA Power-Up Time tPU 10 ms Logic Standby Voltage VLOGIC 2.7 VDD V Logic Active Supply Current ILOGIC (Note 2) 160 µA Logic Standby Supply Current ILOGICSTBY (Note 3) 0.5 1 µA Logic Shutdown Current ILOGICSHDN (Note 4) 1 µA DIGITAL OUTPUT, MODE_IND VLOGIC = 2.7V, ISINK = 10mA 0.4 Output Low Voltage VOL V VLOGIC = 5.5V, ISINK = 10mA 0.2 Output Leakage Current 0.1 10 µA Output Capacitance 3 pF Maximum Sink Current 150 mA Note 1:Parameters are 100% production tested at +85°C and limits through temperature are guaranteed by design. Note 2:Supply current measured with the supply on and a button pushed. Note 3:Supply current measured with the power on, no button pushed, and the wiper position fixed. Note 4:This is the measured current with SHDNlow and MODE_IND unconnected. Maxim Integrated 3

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Typical Operating Characteristics (VDD= VLOGIC= +2.7V to +5.5V, VSS= 0V, GND = 0V, VH_ = VDD, VL_ = VSS, TA= TMINto TMAX. Typical values are at TA= +25°C, unless otherwise specified.) END-TO-END RESISTANCE % CHANGE WIPER RESISTANCE vs. WIPER VOLTAGE ATTENUATION vs. TAP POSITION vs. TEMPERATURE ΩWIPER RESISTANCE ()11111788990011250505050500000000000 VDD = VLOGIC = 5V MAX5456/7 toc01 ATTENUATION (dB) -----54321000000 MAX5456/7 toc02 O-END RESISTANCE CHANGE (%) --0000000.......21012345 MAX5456/7 tpc03 700 D-T -0.3 -60 N 650 E -0.4 600 -70 -0.5 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 4 8 12 16 20 24 28 32 -40 -15 10 35 60 85 WIPER VOLTAGE (V) TAP POSITION TEMPERATURE (°C) WIPER SWITCHING TRANSIENT ACTIVE SUPPLY CURRENT vs. TEMPERATURE (TIMING OUT) 220 MAX5456/7 toc05a µT (A) 221105 IVLDODG I=C V+L IOVGDIDC = 5.5V, MAX5456/7 toc04 5V/div VVHL__ == 0VDD VOLUP N E R 205 R U C Y 200 L P E SUP 195 1V/div WFRIPOEMR -T2RdABN toS I0TdIOBN V CTI 190 A 185 180 -40 -15 10 35 60 85 10ms/div TEMPERATURE (°C) WIPER SWITCHING TRANSIENT LOGIC SUPPLY CURRENT (SUPPRESSION CIRCUIT ACTIVE) vs. LOGIC SUPPLY VOLTAGE MAX5456/7 toc05b 200 5V/div VOLUP µT (A) 111468000 ACTIVE LOGIC SUPPLY MAX5456/7 toc06a VH_ = SQUARE WAVE FROM EN CURRENT VDD TO VSS, VL_ = VDD / 2 RR 120 U C Y 100 L P 2V/div WIPER TRANSITION UP 80 FROM -2dB to 0dB GIC S 60 O L 40 20 0 4ms/div 2.7 3.2 3.7 4.2 4.7 5.2 5.5 LOGIC SUPPLY VOLTAGE (V) 4 Maxim Integrated

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Typical Operating Characteristics (continued) (VDD= VLOGIC= +2.7V to +5.5V, VSS= 0V, GND = 0V, VH_ = VDD, VL_ = VSS, TA= TMINto TMAX. Typical values are at TA= +25°C, unless otherwise specified.) LOGIC SUPPLY CURRENT WIPER-TO-END TERMINAL RESISTANCE vs. LOGIC SUPPLY VOLTAGE vs. TAP POSITION FREQUENCY RESPONSE 0.30 100 µPPLY CURRENT (A) 000...122505 SCTUARNRDEBNYT LOGIC SUPPLY MAX5456/7 toc06b O-END RESISTANCE (%R)HL 5705 RWH MAX5456/7 toc07 SPONSE (dB) -202 VCHL__ == 120.5pVF ±1VPW-P_, VSLE_T =T O2. 50VdB, MAX5456/7 toc08 LOGIC SU 00..0150 MINAL END-T 25 RWL RE --64 W_ SET TO -6dB O N 0 0 -8 2.7 3.2 3.7 4.2 4.7 5.2 5.5 0 8 16 24 32 0.01 0.1 1 10 100 1000 LOGIC SUPPLY VOLTAGE (V) TAP POSITION FREQUENCY (kHz) TOTAL HARMONIC DISTORTION PLUS NOISE DIGITAL SUPPLY CURRENT POWER-SUPPLY REJECTION RATIO vs. FREQUENCY vs. DIGITAL INPUT VOLTAGE vs. FREQUENCY 100 1000 0 10 VW20H_H_ Sz= ET 2TO. 5 T2VO0 ±k-H61dzV BPB,-A PN, VDLP_A =S S2.5V, MAX5456/7 toc09 µA) 890000 MAX5456/7 toc10 --2100 VVDL_D == 25.V5 V±, 1WV_P- PS,E VTH T_O = - 56VdB, MAX5456/7 toc11 1 ENT ( 700 -30 R THD+N (%) 0.1 LOAD = 10kΩ UPPLY CUR 456000000 PSRR (dB) --5400 S 0.01 L -60 A 300 T NO LOAD DIGI 200 -70 0.001 100 -80 0.0001 0 -90 10 100 1000 10,000 100,000 0 1 2 3 4 5 1 10 100 1000 FREQUENCY (Hz) DIGITAL INPUT VOLTAGE (V) FREQUENCY (kHz) LOGIC SUPPLY CURRENT vs. TEMPERATURE SPECTRAL NOISE DENSITY mA) 111445890 VLOGIC = 5.5V MAX5456/7 toc12 1890 MAX5456 toc13 ENT ( 147 )Hz 7 Y CURR 114456 ACCUTRIRVEEN LTOGIC SUPPLY √V/RMS 56 GIC SUPPL 114434 NOISE (n 34 O L 142 2 141 1 140 0 -40 -15 10 35 60 85 0.01 0.1 1 10 100 TEMPERATURE (°C) FREQUENCY (kHz) Maxim Integrated 5

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Pin Description PIN NAME FUNCTION MAX5457 MAX5456 Volume/Balance Control. Each transition from high to low toggles between volume and 3 — MODE balance modes. MODE is pulled high internally with a 50kΩ resistor to VLOGIC. On power-up, the MAX5457 is in volume-control mode. Volume-Control/Balance-Control Mode Indicator Open-Drain Output. Connect to an LED through a resistor to VLOGIC. When the LED is on, the MAX5457 is in balance- 4 — MODE_IND control mode. When the LED is off, the MAX5457 is in volume-control mode. See the Mode Indicator, MODE_IND section for more detail. 5 5 H0 Potentiometer 0 High Terminal. H0 and L0 terminals can be reversed. 6 6 L0 Potentiometer 0 Low Terminal. L0 and H0 terminals can be reversed. 7 7 W0 Potentiometer 0 Wiper Terminal Active-Low Shutdown Input. In shutdown mode, the MAX5456/MAX5457 store the last wiper settings. The wipers move to the L end of the resistor string, and the H end of 8 8 SHDN the resistor string disconnects from the signal input. Terminating shutdown mode restores the wipers to their previous settings. Mute Input. When MUTE is low, the wiper goes to the highest attenuation setting (see 9 9 MUTE Table 1). MUTE is internally pulled up with 50kΩ to VLOGIC. 10 10 W1 Potentiometer 1 Wiper Terminal 11 11 L1 Potentiometer 1 Low Terminal. L1 and H1 terminals can be reversed. 12 12 H1 Potentiometer 1 High Terminal. H1 and L1 terminals can be reversed. 13 13 VSS Negative Power Supply. Bypass with 0.1µF to ground. 14 14 GND Ground 15 15 VLOGIC Digital Logic Power Supply. Bypass with 0.1µF to ground. 16 16 VDD Analog Power Supply. Bypass with 0.1µF to ground. Downward Volume/Channel 0 Balance-Control Input. In volume mode, pressing DN/BAL0 moves both wipers towards the L terminals. In balance mode, pressing 1 — DN/BAL0 DN/BAL0 moves the balance towards channel 0. DN/BAL0 is internally pulled up with 50kΩ to VLOGIC. Upward Volume/Channel 1 Balance-Control Input. In volume mode, pressing UP/BAL1 moves both wipers towards the H terminals. In balance mode, pressing UP/BAL1 2 — UP/BAL1 moves the balance towards channel 1. UP/BAL1 is internally pulled up with 50kΩ to VLOGIC. Channel 1 Balance-Control Input. Pressing BAL1 moves the balance towards channel — 3 BAL1 1. BAL1 is internally pulled up with 50kΩ to VLOGIC. Channel 0 Balance-Control Input. Pressing BAL0 moves the balance towards channel — 4 BAL0 0. BAL0 is internally pulled up with 50kΩ to VLOGIC. Downward Volume-Control Input. Pressing VOLDN moves both wipers towards — 1 VOLDN the L terminals. VOLDN is internally pulled up with 50kΩ to VLOGIC. Upward Volume-Control Input. Pressing VOLUP moves both wipers towards the — 2 VOLUP H terminals. VOLUP is internally pulled up with 50kΩ to VLOGIC. 6 Maxim Integrated

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Detailed Description The MAX5456/MAX5457 dual, logarithmic taper digital potentiometers feature a simple pushbutton interface that MAX5456 controls volume and balance in audio applications. Each MAX5457 potentiometer has 32 tap points and replaces mechanical H_ potentiometers (see the Functional Diagrams). CH Up and Down Interface RW W_ R The MAX5456/MAX5457 interface with momentary con- tact SPST switches. All switch inputs are internally CW debounced and pulled up to VLOGIC through 50kΩ L_ resistors. The wiper setting advances once per button press up to 1s. Maxim’s SmartWiper control circuitry CL allows the wiper to advance at a rate of 4Hz when an input is held low from 1s up to 4s, and at a rate of 16Hz if the contact is maintained for greater than 4s (see Table 2). The SmartWiper control eliminates the need for a microcomputer to increase the wiper transition rate. Figure1. Potentiometer Model (Active) The MAX5456 features independent control inputs for volume and balance control while the MAX5457 MODE input toggles between volume and balance control. Each transition of MODE from high to low toggles the MAX5457 between volume-control and balance-control MAX5456 modes. MODE is internally pulled high with a 50kΩ MAX5457 resistor to VLOGIC. H_ Volume Control CH In volume-control mode, the MAX5456/MAX5457s’ R wipers move simultaneously, maintaining the balance separation between each wiper (Figure3a). RW When either wiper reaches the maximum tap position W_ L_ (position closest to H_), further commands to increase the volume are ignored. Balance separation is main- CW CL tained in the maximum volume configuration (Figure3b). When either wiper reaches the minimum tap position (position closest to L_), further commands to decrease the volume adjust the other wiper until it also reaches the minimum tap position (Figure3c). Figure2. Potentiometer Model (Shutdown) Increasing the volume from this minimum position restores the original balance separation of the wipers (Figure3d). When both wipers are in the 31st tap position (-62dB attenuation), further commands to VOLDN place the wipers in the mute position (see Table 1). VOLUP or MUTEpulses return wipers to position 31. Maxim Integrated 7

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface BALANCE SEPARATION H_ MAINTAINED W0 W1 W0 W1 W0 W1 PRESS VOLUP PRESS VOLDN TWICE ONCE (a) L_ NO CHANGE W0 W1 W0 W1 W0 W1 H_ PRESS VOLUP PRESS VOLUP ONCE (b) L_ H_ W0 W1 W0 W1 W0 W1 PRESS VOLDN PRESS VOLDN ONCE TO 3d (c) L_ ORIGINAL BALANCE SEPARATION H_ MAINTAINED W0 W1 W0 W1 W0 W1 PRESS VOLUP PRESS VOLUP ONCE ONCE FROM 3c (d) L_ Figure3. Volume-Control Operation Table 1. Wiper Position and Attenuation POSITION ATTENUATION (dB) 0 0 1 2 2 4 … … 6 (POR) 12 … … 30 60 31 62 32 (mute) >90 8 Maxim Integrated

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Balance Control Table 2. Wiper Action vs. Pushbutton In balance-control mode, the MAX5456/MAX5457 Contact Duration adjust the balance between channel 0 and channel 1 while maintaining the set volume. For example, if the CONTACT DURATION WIPER ACTION volume of channel 0 equals the volume of channel 1, t < 22.5ms No motion (debouncing). forcing the balance towards channel 1 increases the 22.5ms < t ≤ 1s Wiper changes position once. attenuation of channel 0 (Figure4a). If channel 1 is at a higher attenuation than channel 0, adjusting the bal- Wiper changes position 1s < t ≤ 4s ance to channel 1 moves channel 1’s wiper up to the at a rate of 4Hz. same wiper position as channel 0 before attenuating Wiper changes position channel 0 (Figure4b). t > 4s at a rate of 16Hz. To control the wiper quickly with a logic signal, main- tain pulses at least 22.5ms wide and separated by at least 40ms. VOLUME LEVEL MAINTAINED H_ VOLUME LEVEL IS SET BALANCE SHIFTS TO W1 W0 W1 W0 W1 W0 W1 PRESS BAL1 PRESS BAL1 ONCE ONCE (a) L_ VOLUME LEVEL MAINTAINED H_ VOLUME LEVEL IS SET BY W0 BALANCE SHIFTS TO W1 W0 W1 W0 W1 W0 W1 PRESS BAL1 PRESS BAL1 ONCE ONCE (b) L_ Figure4. Balance-Control Operation Maxim Integrated 9

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Click/Pop Suppression The suppression circuitry monitors left and right chan- The click/pop suppression feature reduces the audible nels separately. In volume-control mode, when the first noise (clicks and pops) that result from wiper transitions. wiper changes position, the second wiper has 32ms to The MAX5456/MAX5457 minimize this noise by allowing change or it will be forced to change. the wiper position changes only when VH_ = VL_. Thus, Power-On Reset the wiper changes position only when the voltage at L_ is the same as the voltage at the corresponding H_. Each The power-on comparators monitor VDD - VSS and wiper has its own suppression and timeout circuitry (see VLOGIC- GND. A power-on reset is initiated when either of the supplies is brought back to normal operating Figure 5a). The MAX5456/MAX5457 change wiper posi- voltage. The power-on-reset feature sets both wipers to tion after 32ms or when VH_= VL, whichever occurs first -12dB. Power-on reset places the MAX5457 in volume- (see Figure5b). control mode. SWITCH SWITCH SWITCH CONTACT CONTACT CONTACT READY TO ACCEPT USER PRESSES PUSHBUTTON IS BOUNCING IS STABLE IS BOUNCING ANOTHER KEYPRESS 1 DN OR UP INPUT ACCEPTED 0 tHPW tIPW tWS DEBOUNCE BY WAITING FOR STABLE HIGH, tHPW WAIT FOR DEBOUNCE BY FIRST ZERO WAITING FOR CROSSING, tWS STABLE LOW, tIPW VH VL WIPER MOVES HERE WIPER MOTION 2dB STEPS Figure5a. Wiper Transition Timing Diagram 10 Maxim Integrated

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Shutdown, SHDN function forces both wipers to maximum attenuation (- Upon entering shutdown mode, the MAX5456/MAX5457 90dB typ). Deactivating the mute function returns the store the last wiper settings. The wipers move to the L_ wipers to their previous settings. Pressing VOLUP also end of the resistor string, and the H_ end of the resistor deactivates mute, setting the wipers to their previous string disconnects from the signal input. Terminating positions. MUTE is internally pulled high with a 50kΩ shutdown mode restores the wipers to their previous resistor to VLOGIC. When both wipers are in the 31st settings (see Figure 2). Shutdown does not affect the tap position (-62dB attenuation), further commands to state of MODE_IND. VOLDN place the wipers in the mute position (see Table 1). VOLUP or MUTE pulses return the wipers to Mute Function, MUTE position 31. The MAX5456/MAX5457 feature a mute function. Success- ive pulses on MUTE toggle its setting. Activating the mute SWITCH SWITCH SWITCH CONTACT CONTACT CONTACT READY TO ACCEPT IS BOUNCING IS STABLE IS BOUNCING ANOTHER KEYPRESS 1 INPUT ACCEPTED 0 tHPW tIPW tWS DEBOUNCE BY WAITING FOR STABLE HIGH, tHPW WAIT FOR DEBOUNCE BY FIRST ZERO WAITING FOR CROSSING OR STABLE LOW, TIMEOUT, tWS tIPW VH VL WIPER MOVES HERE (tIPW + tWS) 2dB STEPS Figure5b. Wiper Transition Timing Diagram Maxim Integrated 11

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Mode Control, MODE Multiple Button Pushes The MAX5457 MODE input toggles between volume- The MAX5456/MAX5457 do not respond to simultane- and balance-control modes. Force MODE low to toggle ous button pushes. Pushing more than one button at the between volume-control and balance-control modes. same time stops the wipers in their present states. Only For example, driving MODE low once while in volume- a single button push configures the device. Additionally, control mode, switches the MAX5457 to balance-con- a 40ms blocking period affects all other inputs when trol mode. Driving mode low once again, switches the releasing any input forced low. The MAX5456/MAX5457 MAX5457 back to volume-control mode. MODE is inter- do not respond to any logic input until the blocking peri- nally pulled high with a 50kΩ resistor to VLOGIC. The od ends. If multiple wiper-control buttons are pressed, MAX5457 powers up in volume-control mode. all wiper-control connections must be released before the part will respond to further commands. Mode Indicator, MODE_IND Applications Information MODE_IND is the volume-control and balance-control mode indicator with an open-drain output. Connect Stereo Volume/Balance Control MODE_IND to an LED through a pullup resistor to Figure 6 shows a volume/balance application using the VLOGIC.When the LED is on, the MAX5457 is in balance- MAX5457. The op amp is connected in a follower (non- control mode. When the LED is off, the MAX5457 is in inverting gain) configuration to isolate the potentiome- volume-control mode. See the Mode Control, MODEsec- ter’s wiper impedance from the load and provide drive tion for more detail on switching between modes. capability. Connect the W_ of the MAX5457 to the posi- Shutdown does not affect the state of MODE_IND. tive input of a noninverting gain amp. The pushbutton potentiometers attenuate the input signals. Use the MODE input to switch between volume-control and bal- ance-control modes. 12 Maxim Integrated

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface VDD VLOGIC VDD SHDN VLOGIC MODE_IND H0 H1 LEFT CHANNEL IN RIGHT CHANNEL IN L0 MAX5457 L1 VDD / 2 VDD / 2 W0 W1 GND VSS MUTE UP/BAL1 DN/BAL0 MODE VDD VDD LEFT AUDIO RIGHT AUDIO INPUT INPUT INL- INL+ SHDN INR+ INR- MAX4494 MAX4494 VDD SVDD PGND MAX9722 OUTL OUTR STEREO HEADPHONE Figure6. Volume/Balance Control Maxim Integrated 13

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Typical Application Circuit (Single Supply) VDD RLOAD = ∞ VVDPDE /A 2K H_ VVDPDE /A 2K VDD RH W_ VPEAK RL VDD / 2 MAX5456/MAX5457 L_ VDD VDD Typical Application Circuit (Dual Supplies) VDD RLOAD = ∞ VPEAK H_ VPE0AVK VDD 0V RH W_ VPEAK RL 0V MAX5456/MAX5457 VSS L_ VSS = -VDD 14 Maxim Integrated

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Functional Diagrams VDD VLOGIC SHDN MAX5456 SHUTDOWN SHUTDOWN H0 H1 CLICK/POP CLICK/POP 0 SUPPRESSION SUPPRESSION 0 CIRCUITRY CIRCUITRY 1 1 2 2 3 3 4 4 POSITION COUNTER POSITION COUNTER W0 W1 UP/DN UP/DN 28 28 TIMING AND CONTROL 29 T F-F 29 DEBOUNCE DEBOUNCE DEBOUNCE DEBOUNCE DEBOUNCE VLOGIC 30 30 31 31 32 32 MUTE MUTE L0 L1 VSS GND VOLUP VOLDN BAL0 BAL1 MUTE Maxim Integrated 15

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Functional Diagrams (continued) VDD VLOGIC SHDN MODE_IND SHUTDOWN MAX5457 SHUTDOWN H0 H1 CLICK/POP CLICK/POP 0 SUPPRESSION SUPPRESSION 0 CIRCUITRY CIRCUITRY 1 1 2 2 3 3 4 4 POSITION COUNTER POSITION COUNTER W0 W1 UP/DN UP/DN 28 28 TIMING AND CONTROL 29 T F-F T F-F 29 DEBOUNCE DEBOUNCE DEBOUNCE DEBOUNCE VLOGIC 30 30 31 31 32 32 MUTE MUTE L0 L1 VSS GND DN/BAL0 UP/BAL1 MODE MUTE 16 Maxim Integrated

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Pin Configurations (continued) Chip Information PROCESS: CMOS TOP VIEW + VOLDN 1 16 VDD Package Information VOLUP 2 15 VLOGIC For the latest package outline information and land patterns (foot- BAL1 3 14 GND prints), go to www.maximintegrated.com/packages. Note that a BAL0 4 MAX5456 13 VSS “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the H0 5 12 H1 drawing pertains to the package regardless of RoHS status. L0 6 11 L1 PACKAGE PACKAGE LAND OUTLINE NO. W0 7 10 W1 TYPE CODE PATTERN NO. SHDN 8 9 MUTE 16 QSOP E16+1 21-0055 90-0167 QSOP Maxim Integrated 17

MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Revision History REVISION REVISION PAGES DESCRIPTION NUMBER DATE CHANGED 0 11/04 Initial release — Update Ordering Information, Absolute Maximum Ratings, Pin Description, 1, 2, 6, 14, 2 8/12 Pin Configuration. Removed Selector Guide and added Package 18–20 Information table and Revision History. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. 18 Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 © 2012 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M axim Integrated: MAX5456EEE+ MAX5456EEE+T MAX5456ETE+ MAX5456ETE+T MAX5457EEE+ MAX5457EEE+T MAX5457ETE+ MAX5457ETE+T