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general description the max5456/max5457 dual, logarithmic taper digital potentiometers feature a simple pushbutton interface that controls volume and balance in audio applications. each potentiometer has 32 tap points and replaces mechanical potentiometers. refer to the max5408 max5411 data sheet for spi versions of the max5456/ max5457. use the max5456/max5457 digital inputs with momen- tary contact single-pole/single-throw (spst) pushbutton switches. each input includes internal debounce cir- cuitry and a 50k ? pullup resistor. the max5456/max5457 advance the wiper setting once per button push. maxim? proprietary smartwiper con- trol eliminates the need for a microcomputer to increase the wiper transition rate. holding the control input low for more than 1s advances the wiper at a rate of 4hz for 4s and 16hz per second thereafter. the max5456/max5457 provide temperature coeffi- cients of 50ppm/? end-to-end and 5ppm/? ratiomet- ric and a nominal resistance of 10k ? per potentiometer. an integrated click/pop suppression feature minimizes the audible noise generated by wiper transitions. the typical total harmonic distortion plus noise (thd+n) for these devices is 0.01%. the max5457 features a 3-button interface with a mode input 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 are available in 16-pin qsop and 16-pin tqfn packages and are specified over the extended (-40? to +85?) temperature range. applications stereo volume control fading and balancing stereo signals stereo blending and mixing features ? smartwiper control provides accelerated wiper motion ? debounced pushbutton interface with internal pullup resistors ? logarithmic taper with 2db steps between taps ? single +2.7v to +5.5v or dual ?.7v supply operation ? low 0.5? standby supply current ? clickless switching ? 10k ? end-to-end fixed resistance value ? mute function to -90db (typ) ? power-on reset to -12db wiper position ? 32 tap positions for each wiper ? small 16-pin qsop/tqfn packages max5456/max5457 stereo audio taper potentiometers with pushbutton interface ________________________________________________________________ maxim integrated products 1 ordering information 19-3490; rev 0; 11/04 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. typical application circuits and selector guide appear at end of data sheet. part temp range pin-package max5456 eee -40 o c to +85 o c 16 qsop MAX5456ETE* -40 o c to +85 o c 16 tqfn max5457 eee* -40 o c to +85 o c 16 qsop max5457ete* -40 o c to +85 o c 16 tqfn spi is a trademark of motorola, inc. smartwiper is a trademark of maxim integrated products, inc. top view 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 dn/bal0 v dd v logic gnd v ss h1 l1 w1 mute max5457 qsop up/bal1 mode l0 mode_ind h0 w0 shdn pin configurations pin configurations are continued at end of data sheet. * future product?ontact factory for availability.
max5456/max5457 stereo audio taper potentiometers with pushbutton interface 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v dd = v logic = +2.7v to +5.5v, v ss = 0v, gnd = 0v, v h_ = v dd , v l_ = v ss , t a = t min to t max . typical values are at t a = +25?, unless otherwise specified.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (max5456) shdn , mute , volup , voldn , bal_ to gnd.....................................-0.3v to (v logic + 0.3v) (max5457) shdn , mute , up / bal1 , dn / bal0 , mode , mode_ind to gnd...........................-0.3v to (v logic + 0.3v) h_, l_, and w_ to v ss ..............................-0.3v to (v dd + 0.3 v) v dd to gnd ..............................................................-0.3v to +6v v dd to v ss ................................................................-0.3v to +6v v logic to gnd.........................................................-0.3v to +6v v logic to v ss ...........................................................-0.3v to +6v v ss to gnd............................................................-3.0v to +0.3v peak current into h_, l_, and w_.......................................?ma average current into h_, l_, and w_ ..............................?00? input and output latchup immunity...............................?00ma continuous power dissipation (t a = +70?) 16-pin qsop (derate 8.3mw/? above +70?)........666.7mw 16-pin tqfn (derate 16.9mw/? above +70?) ....1349.1mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-60? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units end-to-end resistance r figures 1, 2 7 10 13 k ? maximum bandwidth f cutoff from h_ to w_, c load = 10pf 100 khz absolute ratio tolerance n o l oad at th e outp ut of the w i p er , w _ = - 6d b ?.25 db tap-to-tap tolerance ?.1 db v dd = 5v, v h_ = (v dd / 2) + 1v rms , f = 1khz, tap = -6db, v l_ = v dd / 2, r l = ? to (v dd / 2), c l = 5pf, tap = -6db 0.23 % channel-to-channel isolation -100 db interchannel matching f = 20hz to 20khz, tap = -6db ?.5 db mute attenuation -90 db power-supply rejection ratio psrr -80 db wiper resistance r w 1000 1700 ? wiper capacitance c w 10 pf h terminal capacitance c h 5pf l terminal capacitance c l 7pf end-to-end resistance temperature coefficient 50 ppm/? ratiometric resistance temperature coefficient 5 ppm/? output noise e n 20hz to 20khz 0.95 ? rms pushbutton contact inputs ( up / bal1 , dn / bal0 , mute , volup , voldn , bal0 , bal1 , mode ) internal pullup resistor r pullup 32 50 65 k ? single pulse-width input t lpw figure 5 22.5 ms repetitive input pulse high time t hpw figure 5 40 ms timeout period t ws click/pop suppression inactive 32 ms
max5456/max5457 stereo audio taper potentiometers with pushbutton interface _______________________________________________________________________________________ 3 note 1: parameters are 100% production tested at +85? 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 shdn low and mode_ind unconnected. electrical characteristics (continued) (v dd = v logic = +2.7v to +5.5v, v ss = 0v, gnd = 0v, v h_ = v dd , v l_ = v ss , t a = t min to t max . typical values are at t a = +25?, unless otherwise specified.) (note 1) parameter symbol conditions min typ max units first autoincrement point 1 s first autoincrement rate 4hz second autoincrement point 4s second autoincrement rate 16 hz digital inputs (v logic > 4.5v) input high voltage v ih 2.4 v input low voltage v il 0.8 v input leakage current inputs floating ? ? input capacitance 5pf digital inputs (v logic < 4.5v) input high voltage v ih 0.7 x v l ogic v input low voltage v il 0.3 x v l ogic v input leakage current inputs floating ? ? input capacitance 5pf power supplies supply voltage v dd 2.7 5.5 v negative power supply v ss -2.7 0v supply-voltage difference v dd - v ss 5.5 v active supply current i dd (note 2) 100 ? v d d = + 5.5v , v s s = 0v , v logic = 2.7v ( n ote 3) 210 standby supply current i stby v logic = v dd = +2.7v, v ss = -2.7v (note 3) 0.5 1 ? shutdown supply current i shdn (note 4) 1 a power-up time t pu 10 ms logic standby voltage v logic 2.7 v dd v logic active supply current i logic (note 2) 160 ? logic standby supply current i logicstby (note 3) 0.5 1 a logic shutdown current i logicshdn (note 4) 1 a digital output, mode_ind v logic = 2.7v, i sink = 10ma 0.4 output low voltage v ol v logic = 5.5v, i sink = 10ma 0.2 v output leakage current 0.1 10 ? output capacitance 3pf maximum sink current 150 ma
max5456/max5457 stereo audio taper potentiometers with pushbutton interface 4 _______________________________________________________________________________________ t ypical operating characteristics (v dd = v logic = +2.7v to +5.5v, v ss = 0v, gnd = 0v, v h _ = v dd , v l _ = v ss , t a = t min to t max . typical values are at t a = +25?, unless otherwise specified.) wiper resistance vs. wiper voltage max5456/7 toc01 wiper voltage (v) wiper resistance ( ? ) 4.5 3.5 4.0 1.5 2.0 2.5 3.0 1.0 650 700 750 800 850 900 950 1000 1050 1100 1150 1200 600 0.5 5.0 v dd = v logic = 5v attenuation vs. tap position max5456/7 toc02 tap position attenuation (db) 28 24 20 16 12 8 4 -60 -50 -40 -30 -20 -10 0 -70 032 end-to-end resistance % change vs. temperature max5456/7 tpc03 temperature ( c) end-to-end resistance change (%) 60 35 10 -15 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 -40 85 active supply current vs. temperature active supply current ( a) 185 190 195 200 210 205 215 220 180 max5456/7 toc04 temperature ( c) 60 35 10 -15 -40 85 v dd = v logic = 5.5v, i logic + i vdd wiper switching transient (timing out) max5456/7 toc05a 10ms/div 5v/div 1v/div volup wiper transition from -2db to 0db v h_ = v dd v l_ = 0 wiper switching transient (suppression circuit active) max5456/7 toc05b 4ms/div 5v/div 2v/div volup wiper transition from -2db to 0db v h _ = square wave from v dd to v ss , v l _ = v dd / 2 logic supply current vs. logic supply voltage max5456/7 toc06a logic supply voltage (v) logic supply current ( a) 20 40 60 80 100 120 140 160 180 200 0 active logic supply current 5.2 5.5 4.2 4.7 3.7 3.2 2.7
max5456/max5457 stereo audio taper potentiometers with pushbutton interface _______________________________________________________________________________________ 5 frequency response frequency (khz) response (db) 100 10 1 0.1 -6 -4 -2 0 2 -8 0.01 1000 max5456/7 toc08 v h_ = 2.5v 1v p-p , v l_ = 2.5v, c l_ = 10pf w_ set to 0db w_ set to -6db total harmonic distortion plus noise vs. frequency frequency (hz) thd+n (%) 10,000 1000 100 0.001 0.01 0.1 1 10 100 0.0001 10 100,000 max5456/7 toc09 v h_ = 2.5v 1v p-p , v l_ = 2.5v, w_ set to -6db, 20hz to 20khz bandpass load = 10k ? no load digital supply current vs. digital input voltage max5456/7 toc10 digital input voltage (v) digital supply current ( a) 4 3 2 1 100 200 300 400 500 600 700 800 900 1000 0 05 power-supply rejection ratio vs. frequency max5456/7 toc11 frequency (khz) psrr (db) 100 10 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 11000 v dd = 5v 1v p-p , v h_ = 5v, v l_ = 2.5v, w_ set to -6db logic supply current vs. temperature max5456/7 toc12 temperature ( c) logic supply current (ma) 60 35 10 -15 141 142 143 144 145 146 147 148 149 150 140 -40 85 v logic = 5.5v active logic supply current t ypical operating characteristics (continued) (v dd = v logic = +2.7v to +5.5v, v ss = 0v, gnd = 0v, v h _ = v dd , v l _ = v ss , t a = t min to t max . typical values are at t a = +25?, unless otherwise specified.) 0.05 0.10 0.15 0.20 0.25 0.30 0 logic supply current vs. logic supply voltage max5456/7 toc06b logic supply voltage (v) logic supply current ( a) 5.2 5.5 4.2 4.7 3.7 3.2 2.7 standby logic supply current wiper-to-end terminal resistance vs. tap position max5456/7 toc07 tap position nominal end-to-end resistance (%r hl ) 24 16 8 25 50 75 100 0 032 r wh r wl spectral noise density max5456 toc13 frequency (khz) noise (nv rms / hz ) 10 1 0.1 1 2 3 4 5 6 7 8 9 10 0 0.01 100
max5456/max5457 stereo audio taper potentiometers with pushbutton interface 6 _______________________________________________________________________________________ pin description pin max5457 max5456 tqfn qsop tqfn qsop name function 13 mode volume/balance control. each transition from high to low toggles between volume and balance modes. mode is pulled high internally with a 50k ? resistor to v logic . on power-up, the max5457 is in volume-control mode. 24 mode_ind volume-control/balance-control mode indicator open-drain output. connect to an led through a resistor to v logic . when the led is on, the max5457 is in balance-control mode. when the led is off, the max5457 is in volume-control mode. see the mode indicator, mode_ind section for more detail. 3 535 h0 potentiometer 0 high terminal. h0 and l0 terminals can be reversed. 4 646 l0 potentiometer 0 low terminal. l0 and h0 terminals can be reversed. 5 757 w0 potentiometer 0 wiper terminal 6 868 shdn 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 the resistor string disconnects from the signal input. terminating shutdown mode restores the wipers to their previous settings. 7 979 mute mute input. when mute is low, the wiper goes to the highest attenuation setting (see table 1). mute is internally pulled up with 50k ? to v logic . 81 08 10 w1 potentiometer 1 wiper terminal 91 19 11 l1 potentiometer 1 low terminal. l1 and h1 terminals can be reversed. 10 12 10 12 h1 potentiometer 1 high terminal. h1 and l1 terminals can be reversed. 11 13 11 13 v ss negative power supply. bypass with 0.1? to ground. 12 14 12 14 gnd ground 13 15 13 15 v logic digital logic power supply. bypass with 0.1? to ground. 14 16 14 16 v dd analog power supply. bypass with 0.1? to ground. 15 1 dn / bal0 downward volume/channel 0 balance-control input. in volume mode, pressing dn / bal0 moves both wipers towards the l terminals. in balance mode, pressing dn / bal0 moves the balance towards channel 0. dn / bal0 is internally pulled up with 50k ? to v logic . 16 2 up / bal1 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 moves the balance towards channel 1. up / bal1 is internally pulled up with 50k ? to v logic . 1 3 bal1 channel 1 balance-control input. pressing bal1 moves the balance towards channel 1. bal1 is internally pulled up with 50k ? to v logic . 2 4 bal0 channel 0 balance-control input. pressing bal0 moves the balance towards channel 0. bal0 is internally pulled up with 50k ? to v logic . 15 1 voldn downward volume-control input. pressing voldn moves both wipers towards the l terminals. voldn is internally pulled up with 50k ? to v logic . 16 2 volup upward volume-control input. pressing volup moves both wipers towards the h terminals. volup is internally pulled up with 50k ? to v logic .
max5456/max5457 stereo audio taper potentiometers with pushbutton interface _______________________________________________________________________________________ 7 detailed description the max5456/max5457 dual, logarithmic taper digital potentiometers feature a simple pushbutton interface that controls volume and balance in audio applications. each potentiometer has 32 tap points and replaces mechanical potentiometers (see the functional diagrams ). up and down interface the max5456/max5457 interface with momentary con- tact spst switches. all switch inputs are internally debounced and pulled up to v logic through 50k ? resistors. the wiper setting advances once per button press up to 1s. maxim? smartwiper control circuitry 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. 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 modes. mode is internally pulled high with a 50k ? resistor to v logic. volume control in volume-control mode, the max5456/max5457s wipers move simultaneously, maintaining the balance separation between each wiper (figure 3a). when either wiper reaches the maximum tap position (position closest to h_), further commands to increase the volume are ignored. balance separation is main- tained in the maximum volume configuration (figure 3b). 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 (figure 3c). increasing the volume from this minimum position restores the original balance separation of the wipers (figure 3d). 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 mute pulses return wipers to position 31. c h c l c w max5456 max5457 r w w_ h_ l_ r figure 1. potentiometer model (active) c h c l c w max5456 max5457 r w w_ h_ l_ r figure 2. potentiometer model (shutdown)
max5456/max5457 stereo audio taper potentiometers with pushbutton interface 8 _______________________________________________________________________________________ (a) w0 h_ h_ h_ h_ l_ l_ w1 w0 w0 w1 w1 press volup twice press voldn once no change w0 w1 w0 w0 w1 w1 press volup once press volup (b) w0 w1 w0 w0 w1 w1 press voldn once press voldn (c) w0 w1 w0 w0 w1 w1 press volup once (d) press volup once balance separation maintained original balance separation maintained to 3d from 3c l_ l_ figure 3. volume-control operation table 1. wiper position and attenuation position attenuation (db) 00 12 24 6 (por) 12 30 60 31 62 32 (mute) >90
max5456/max5457 stereo audio taper potentiometers with pushbutton interface _______________________________________________________________________________________ 9 balance control in balance-control mode, the max5456/max5457 adjust the balance between channel 0 and channel 1 while maintaining the set volume. for example, if the volume of channel 0 equals the volume of channel 1, forcing the balance towards channel 1 increases the attenuation of channel 0 (figure 4a). if channel 1 is at a higher attenuation than channel 0, adjusting the bal- ance to channel 1 moves channel 1? wiper up to the same wiper position as channel 0 before attenuating channel 0 (figure 4b). to control the wiper quickly with a logic signal, main- tain pulses at least 22.5ms wide and separated by at least 40ms. table 2. wiper action vs. pushbutton contact duration contact duration wiper action t < 22.5ms no motion (debouncing). 22.5ms < t 1s wiper changes position once. 1s < t 4s wiper changes position at a rate of 4hz. t > 4s wiper changes position at a rate of 16hz. (a) w0 h_ l_ h_ l_ w1 w0 w0 w1 w1 w0 w1 w0 w0 w1 w1 (b) volume level is set volume level maintained balance shifts to w1 volume level maintained balance shifts to w1 volume level is set by w0 press bal1 once press bal1 once press bal1 once press bal1 once figure 4. balance-control operation
max5456/max5457 stereo audio taper potentiometers with pushbutton interface 10 ______________________________________________________________________________________ click/pop suppression the click/pop suppression feature reduces the audible noise (clicks and pops) that result from wiper transitions. the max5456/max5457 minimize this noise by allowing the wiper position changes only when v h_ = v l_ . thus, the wiper changes position only when the voltage at l_ is the same as the voltage at the corresponding h_. each wiper has its own suppression and timeout circuitry (see figure 5a). the max5456/max5457 change wiper posi- tion after 32ms or when v h_ = v l , whichever occurs first (see figure 5b). the suppression circuitry monitors left and right chan- nels separately. in volume-control mode, when the first wiper changes position, the second wiper has 32ms to change or it will be forced to change. power-on reset the power-on comparators monitor v dd - v ss and v logic - gnd. a power-on reset is initiated when either of the supplies is brought back to normal operating voltage. the power-on-reset feature sets both wipers to -12db. power-on reset places the max5457 in volume- control mode. dn or up 1 0 user presses pushbutton switch contact is bouncing switch contact is stable switch contact is bouncing ready to accept another keypress input accepted t ipw t ws t hpw debounce by w aiting for stable low, t ipw w ait for first zero crossing, t ws debounce by w aiting for stable high, t hpw v h v l wiper motion wiper moves here 2db steps figure 5a. wiper transition timing diagram
max5456/max5457 stereo audio taper potentiometers with pushbutton interface ______________________________________________________________________________________ 11 1 0 switch contact is bouncing switch contact is stable switch contact is bouncing ready to accept another keypress input accepted t ipw t ws t hpw debounce by w aiting for stable low, t ipw w ait for first zero crossing or timeout, t ws debounce by w aiting for stable high, t hpw v h v l wiper moves here 2db steps (t ipw + t ws ) figure 5b. wiper transition timing diagram shutdown, shdn upon entering 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 the resistor string disconnects from the signal input. terminating shutdown mode restores the wipers to their previous settings (see figure 2). shutdown does not affect the state of mode_ind. mute function, mute the max5456/max5457 feature a mute function. success- ive pulses on mute toggle its setting. activating the mute function forces both wipers to maximum attenuation (- 90db typ). deactivating the mute function returns the wipers to their previous settings. pressing volup also deactivates mute, setting the wipers to their previous positions. mute is internally pulled high with a 50k ? resistor to vlogic. 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 mute pulses return the wipers to position 31.
max5456/max5457 stereo audio taper potentiometers with pushbutton interface 12 ______________________________________________________________________________________ mode control, mode the max5457 mode input toggles between volume- and balance-control modes. force mode low to toggle between volume-control and balance-control modes. for example, driving mode low once while in volume- control mode, switches the max5457 to balance-con- trol mode. driving mode low once again, switches the max5457 back to volume-control mode. mode is inter- nally pulled high with a 50k ? resistor to v logic . the max5457 powers up in volume-control mode. mode indicator, mode_ind mode_ind is the volume-control and balance-control mode indicator with an open-drain output. connect mode_ind to an led through a pullup resistor to v logic .w hen the led is on, the max5457 is in balance- control mode. when the led is off, the max5457 is in volume-control mode. see the mode control, mode sec- tion for more detail on switching between modes. shutdown does not affect the state of mode_ind. multiple button pushes the max5456/max5457 do not respond to simultane- ous button pushes. pushing more than one button at the same time stops the wipers in their present states. only a single button push configures the device. additionally, a 40ms blocking period affects all other inputs when releasing any input forced low. the max5456/max5457 do not respond to any logic input until the blocking peri- od ends. if multiple wiper-control buttons are pressed, all wiper-control connections must be released before the part will respond to further commands. applications information stereo volume/balance control figure 6 shows a volume/balance application using the max5457. the op amp is connected in a follower (non- inverting gain) configuration to isolate the potentiome- ter? wiper impedance from the load and provide drive capability. connect the w_ of the max5457 to the posi- 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.
max5456/max5457 stereo audio taper potentiometers with pushbutton interface ______________________________________________________________________________________ 13 mute v ss v dd v logic gnd up/bal1 dn/bal0 mode max5457 v dd / 2 v dd / 2 max9722 v dd v dd max4494 max4494 left audio input right audio input inl- inl+ shdn inr+ inr- left channel in right channel in h0 l0 w0 h1 l1 w1 v logic v dd mode_ind shdn stereo headphone outl outr v dd sv dd pgnd figure 6. volume/balance control
max5456/max5457 stereo audio taper potentiometers with pushbutton interface 14 ______________________________________________________________________________________ selector guide part interface pkg. code max5456eee 4-button e16-1 MAX5456ETE* 4-button t1644-4 max5457eee 3-button e16-1 max5457ete* 3-button t1644-4 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 voldn v dd v logic gnd v ss h1 l1 w1 mute top view max5456 qsop volup bal1 l0 bal0 h0 w0 shdn 16 1 2 3 4 12 11 10 9 15 14 13 5678 up/bal1 dn/bal0 v dd v logic gnd v ss h1 l1 mode_ind h0 l0 w0 shdn mute w1 mode max5457 tqfn 16 1 2 3 4 12 11 10 9 15 14 13 5678 volup voldn v dd v logic gnd v ss h1 l1 bal0 h0 l0 w0 shdn mute w1 bal1 max5456 tqfn pin configurations (continued) chip information transistor count: 15,395 process: cmos * future product?ontact factory for availability.
max5456/max5457 stereo audio taper potentiometers with pushbutton interface ______________________________________________________________________________________ 15 max5456/max5457 v dd w_ l_ h_ v dd v dd v dd r h r l v peak v dd / 2 v peak v dd / 2 v peak v dd / 2 r load = t ypical application circuit (single supply) max5456/max5457 v dd w_ l_ h_ v dd r h r l v peak 0v v peak 0v v peak 0v r load = v ss = -v dd v ss t ypical application circuit (dual supplies)
max5456/max5457 stereo audio taper potentiometers with pushbutton interface 16 ______________________________________________________________________________________ debounce debounce debounce debounce position counter position counter v logic debounce t f-f click/pop suppression circuitry click/pop suppression circuitry max5456 h0 w0 l0 h1 w1 l1 v ss gnd volup voldn bal0 bal1 up/dn up/dn v dd v logic shdn shutdown 0 1 2 3 4 28 29 30 31 32 mute shutdown 0 1 2 3 4 28 29 30 31 32 mute timing and control mute functional diagrams
max5456/max5457 stereo audio taper potentiometers with pushbutton interface ______________________________________________________________________________________ 17 debounce debounce debounce debounce position counter position counter v logic timing and control t f-f t f-f click/pop suppression circuitry click/pop suppression circuitry max5457 h0 w0 l0 h1 w1 l1 v ss gnd dn/bal0 up/bal1 mode mute up/dn up/dn v dd v logic shdn mode_ind shutdown 0 1 2 3 4 28 29 30 31 32 mute shutdown 0 1 2 3 4 28 29 30 31 32 mute functional diagrams (continued)
max5456/max5457 stereo audio taper potentiometers with pushbutton interface 18 ______________________________________________________________________________________ pa c kag e information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) qsop.eps e 1 1 21-0055 package outline, qsop .150", .025" lead pitch
max5456/max5457 stereo audio taper potentiometers with pushbutton interface ______________________________________________________________________________________ 19 package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) 24l qfn thin.eps package outline, 21-0139 2 1 d 12, 16, 20, 24, 28l thin qfn, 4x4x0.8mm
max5456/max5457 stereo audio taper potentiometers with pushbutton interface maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 20 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) package outline, 21-0139 2 2 d 12, 16, 20, 24, 28l thin qfn, 4x4x0.8mm

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