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general description the max5471/max5472/max5474/max5475 linear-taper digital potentiometers function as mechanical potentiometers, but replace the mechanics with a sim- ple 3-wire up/down digital interface. these digital potentiometers feature nonvolatile memory (eeprom) to return the wiper to its previously stored position upon power-up. the max5471/max5472 are 2-terminal, variable resistors in 6-pin sot23 packages. the max5474/max5475 are 3-terminal potentiometers in 8-pin sot23 packages. the max5471/max5474 have an end-to-end resistance of 50k , and the max5472/max5475 have an end- to-end resistance of 100k . all of these devices have 32 wiper positions, a low ratiometric temperature coeffi-cient (5ppm/?), and all operate from a single +2.7v to +5.25v supply. each device is guaranteed over the extended -40 c to +85 c temperature range. applications mechanical potentiometer replacementliquid-crystal-display (lcd) screen adjustment audio volume control programmable filters features ? wiper position stored in nonvolatile memory andrecalled upon power-up ? tiny sot23 package ? 35ppm/? end-to-end resistance temperaturecoefficient ? 5ppm/? ratiometric temperature coefficient ? 32 tap positions ? voltage-divider or variable-resistorpotentiometer configuration ? 50k and 100k end-to-end resistance values ? 1? (max) static supply current ? 2.7v to 5.25v single-supply operation ? 200,000 wiper store cycles ? 50-year wiper data retention max5471/max5472/max5474/max5475 32-tap, nonvolatile, linear-taper digital potentiometers in sot23 ________________________________________________________________ maxim integrated products 1 ordering information 19-3067; rev 1; 2/06 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. evaluation kit available part temp range pin-package pkg code m a x5 4 7 1 e z t- t- 40 c to + 85 c 6 thin sot23-6 z6-1 m a x5 4 7 2 e z t- t- 40 c to + 85 c 6 thin sot23-6 z6-1 m a x5 4 7 4 e ka- t- 40 c to + 85 c 8 sot23-8 k8s-3 m a x5 4 7 5 e ka- t- 40 c to + 85 c 8 sot23-8 k8s-3 top view l gnd hinc w 1 gnd sot23-6 sot23-8 23 65 4 cs u/d u/d max5471max5472 1 v dd v dd h 23 87 6 cs max5474max5475 4 5 inc pin configurations part end-to-end resistance (k ) top mark max5471ezt 50 abqn max5472ezt 100 abqm max5474eka 50 aeiz MAX5475EKA 100 aeiy selector guide downloaded from: http:///
max5471/max5472/max5474/max5475 32-tap, nonvolatile, linear-taper digital potentiometers in sot23 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics(v dd = +2.7v to +5.25v, v h = v dd , v l = gnd, t a = -40 c to +85 c, unless otherwise noted. typical values are at v dd = +5.0v, t a = +25 c, unless otherwise noted.) (note 1) stresses beyond those listed under ?bsolute 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. v dd to gnd ...........................................................-0.3v to +6.0v all other pins to gnd .........-0.3v to the lower of (v dd + 0.3v) or +6.0v maximum continuous current into h, l, and w max5471/max5474 ..................................................... 1.3ma max5472/max5475 ..................................................... 0.6ma continuous power dissipation (t a = +70 c) 6-pin sot23 (derate 9.1mw/ c above +70 c)............727mw 8-pin sot23 (derate 8.9mw/ c above +70 c)............714mw operating temperature range ...........................-40 c to +85 c junction temperature ......................................................+150 c storage temperature range .............................-60 c to +150 c lead temperature (soldering, 10s) .................................+300 c parameter symbol conditions min typ max units dc performance resolution n 32 tap max5471/max5474 37.5 50 62.5 end-to-end resistance max5472/max5475 75 100 125 k end-to-end resistancetemperature coefficient tc r 35 ppm/ c ratiometric resistancetemperature coefficient 5 ppm/ c variable-resistor mode (note 2) ?.5 ?.0 integral nonlinearity inl voltage-divider mode (max5474/max5475)(note 3) ?.1 ?.5 lsb variable-resistor mode (note 2) ?.5 ?.0 differential nonlinearity dnl voltage-divider mode (max5474/max5475)(note 3) ?.1 ?.5 lsb full-scale error max5474/max5475 -0.5 lsb zero-scale error max5474/max5475 +0.5 lsb wiper resistance r w max5474/max5475 (note 4) 600 1200 digital inputs ( cs , u/ d , inc ) (note 5) v dd < 3.6v 0.7 x v dd input high voltage v ih v dd 3.6v 2.4 v v dd < 3.6v 0.3 x v dd input low voltage v il v dd 3.6v 0.8 v input current i in ?.1 1 a dynamic characteristics max5471/max5474 400 wiper -3db bandwidth (note 6) max5472/max5475 200 khz downloaded from: http:///
max5471/max5472/max5474/max5475 32-tap, nonvolatile, linear-taper digital potentiometers in sot23 _______________________________________________________________________________________ 3 note 1: all devices are production tested at t a = +25? and are guaranteed by design and characterization for -40? < t a < +85?. note 2: the dnl and inl are measured with the potentiometer configured as a variable resistor. for the 3-terminal potentiometers(max5474/max5475), h is unconnected and l = gnd. at v dd = 5.25v, w is driven with a source current of 80? for the 50k configuration, and 40? for the 100k configuration. at v dd = 2.7v, the wiper terminal is driven with a source current of 40? for the 50k configuration, and 20? for the 100k configuration. note 3: the dnl and inl are measured with the potentiometer configured as a voltage-divider with h = v dd and l = gnd (max5474/max5475 only). the wiper terminal is unloaded. note 4: the wiper resistance is the worst value measured by injecting the currents given in note 2 into w with l = gnd. r w = (v w - v h ) / i w . note 5: the device draws higher supply current when digital inputs are driven with voltages between 0.3v x v dd and 0.7 x v dd . drive the digital inputs as close as possible to v dd or gnd. (see the typical operating characteristics for the supply current vs. digital input voltage graph.) note 6: wiper at midscale with a 10pf load. note 7: digital timing is guaranteed by design and characterization, and is not production tested. note 8: wiper settling time is the worst-case 0% to 50% rise time measured between consecutive wiper positions. h = v dd , l = gnd, and the wiper terminal is unloaded and measured with a 10pf oscilloscope probe (see the typical operating characteristics for the tap-to-tap switching transient). note 9: digital inputs cs , u/ d , and inc are connected to gnd or v dd . see the typical operating characteristics for the static supply current vs. temperature graph. electrical characteristics (continued)(v dd = +2.7v to +5.25v, v h = v dd , v l = gnd, t a = -40 c to +85 c, unless otherwise noted. typical values are at v dd = +5.0v, t a = +25 c, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units timing characteristics (figure 1, note 7) cs to inc setup t ci 50 ns inc high to u/ d change t id 0n s u/ d to inc setup t di 100 ns inc low period t il 50 ns inc high period t ih 50 ns inc cycle time t cyc 100 ns inc inactive to cs inactive t ic 100 ns inc active to cs inactive t ik 100 ns cs deselect time (store) t cph 100 ns wiper settling time t iw (note 8) 1 s power-up to wiper stable t pu 1 s wiper store cycle t wsc 12 ms nonvolatile memory reliability data retention t a = +85? 50 year t a = +25? 200,000 endurance t a = +85? 50,000 store power supply supply voltage v dd 2.70 5.25 v supply current i dd write to memory 400 ? static supply current i sd t a = +25? (note 9) 0.35 1 a downloaded from: http:///
max5471/max5472/max5474/max5475 32-tap, nonvolatile, linear-taper digital potentiometers in sot23 4 _______________________________________________________________________________________ typical operating characteristics (v dd = 5.0v, t a = +25 c, unless otherwise noted.) supply current vs. supply voltage max5471 toc01 supply voltage (v) supply current ( a) 5.1 4.7 4.3 3.9 3.5 3.1 0.1 0.2 0.3 0.4 0.5 0 2.7 5.5 digital inputs = gnd or v dd static supply current vs. temperature max5471 toc02 temperature ( c) supply current ( a) 60 35 10 -15 0.1 0.2 0.3 0.4 0.5 0 -40 85 digital inputs = gnd or v dd v dd = 5.0v v dd = 3.0v supply current vs. digital input voltage max5471 toc03 digital input voltage (v) supply current ( a) 4 3 2 1 1 10 100 1000 10,000 0.1 05 v dd = 5.0v v dd = 3.0v wiper resistance vs. tap position (max5474) max5471 toc04 tap position wiper resistance ( ) 25 20 51015 250 300 350 400 450 500 550 600200 03 0 v dd = 3.0v v dd = 5.0v wiper resistance vs. tap position (max5475) max5471 toc05 tap position wiper resistance ( ) 25 20 51015 250 300 350 400 450 500 550 600200 03 0 v dd = 3.0v v dd = 5.0v end-to-end resistance % change vs. temperature max5471 toc06 temperature ( c) end-to-end resistance % change 60 35 -15 10 -0.15 -0.10 -0.05 0 0.05 0.10 0.15 0.20 -0.20 -40 85 100k 100k 50k 50k w-to-l resistance vs. tap position max5471 toc07 tap position w-to-l resistance (k ) 25 20 15 10 5 20 40 60 80 100 0 03 0 max5475 max5474 h-to-gnd resistance vs. tap position max5471 toc08 tap position h-to-gnd resistance (k ) 25 20 15 10 5 20 40 60 80 100 0 03 0 max5472 max5471 tap-to-tap switching transient max5471 toc09 400ns/div inc 5v/div w 100mv/div c l = 10pf v h = v dd tap 16 to tap 15 max5474 max5475 downloaded from: http:///
max5471/max5472/max5474/max5475 32-tap, nonvolatile, linear-taper digital potentiometers in sot23 _______________________________________________________________________________________ 5 wiper transient at power-on (max5475) max5471 toc11 1.0 s/div v dd 5v/div w 1v/div c l = 10pf tap 16v h = v dd wiper response vs. frequency max5471toc12 frequency (khz) wiper response (db) 100 10 -15 -12 -9 -6 -3 0 -18 1 1000 tap = 16c l = 10pf max5474 max5475 resistance dnl vs. tap position (max5471) max5471 toc13 tap position resistance dnl 25 20 15 10 5 -0.2 -0.1 0 0.1 0.2 0.3 -0.3 03 0 variable-resistor mode resistance inl vs. tap position (max5471) max5471 toc14 tap position resistance inl 25 20 15 10 5 0 0.1 0.2 0.3 0.4 0.5 -0.1 03 0 variable-resistor mode resistance dnl vs. tap position (max5472) max5471 toc15 tap position resistance dnl 25 20 15 10 5 -0.2 -0.1 0 0.1 0.2 0.3 -0.3 03 0 variable-resistor mode resistance inl vs. tap position (max5472) max5471 toc16 tap position resistance inl 25 20 15 10 5 0 0.1 0.2 0.3 0.4 0.5 -0.1 03 0 variable-resistor mode resistance dnl vs. tap position (max5474) max5471 toc17 tap position resistance dnl 25 20 15 10 5 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 -0.04 03 0 voltage-divider mode resistance inl vs. tap position (max5474) max5471 toc18 tap position resistance inl 25 20 15 10 5 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 -0.04 03 0 voltage-divider mode typical operating characteristics (continued) (v dd = 5.0v, t a = +25 c, unless otherwise noted.) wiper transient at power-on (max5474) max5471 toc10 1.0 s/div v dd 5v/div w 1v/div c l = 10pf tap 16v h = v dd downloaded from: http:///
max5471/max5472/max5474/max5475 32-tap, nonvolatile, linear-taper digital potentiometers in sot23 6 _______________________________________________________________________________________ pin description resistance dnl vs. tap position (max5475) max5471 toc19 tap position resistance dnl 25 20 15 10 5 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 -0.04 03 0 voltage-divider mode resistance inl vs. tap position (max5475) max5471 toc20 tap position resistance inl 25 20 15 10 5 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 -0.04 03 0 voltage-divider mode typical operating characteristics (continued) (v dd = 5.0v, t a = +25 c, unless otherwise noted.) pin max5471/ max5472 max5474/ max5475 name function 11 cs chip-select input. drive low to change wiper position (w) through inc and u/ d . a low-to- high transition with inc high stores the wiper position in nonvolatile memory. 2 3 gnd ground 34u / d up/down control input. with u/ d low, a high-to-low inc transition decrements the wiper position. with u/ d high, a high-to-low inc transition increments the wiper position. 45 inc wiper increment control input. with cs low, the wiper position moves in the direction determined by the state of u/ d on a high-to-low transition. 56h high terminal of resistor. the voltage at h can be greater than or less than the voltage at l.current can flow into or out of h. 62v dd power supply 7 w wiper terminal of resistor ? l low terminal of resistor. the voltage at l can be greater than or less than the voltage at h.current can flow into or out of l. downloaded from: http:///
max5471/max5472/max5474/max5475 32-tap, nonvolatile, linear-taper digital potentiometers in sot23 _______________________________________________________________________________________ 7 detailed description the max5471/max5472/max5474/max5475 contain aresistor array with 31 resistive elements (figures 2 and 3). the max5471/max5474 have a total end-to-end resistance of 50k , and the max5472/max5475 have an end-to-end resistance of 100k . the max5471/ max5472 wiper is connected to the high terminal, andthe low terminal is internally connected to ground, mak- ing the device a variable resistor. the max5474/ max5475 allow access to the high, low, and wiper ter- minals for a standard voltage-divider configuration. the wiper is moved among the 32 tap points through a simple 3-wire interface. nonvolatile memory allows the wiper position to be stored and recalled to the same point upon power-up. digital interface logic inputs cs , u/ d , and inc control the wiper posi- tion and store it in nonvolatile memory (see the truth table ). the chip-select ( cs ) input enables the serial interface when low and disables the interface whenhigh. the position of the wiper is stored when cs transi- tions from low to high and inc is high (see the storing wiper position section). with the serial interface active ( cs low), a high-to-low (falling edge) transition on inc moves the wiper posi- tion by one resistive element in the direction deter-mined by the state of u/ d . if u/ d is high, the wiper increments and it increases the resistance between wand l (it decreases the resistance between h and w). if u/ d is low, the wiper decrements and it decreases the resistance between w and l (it increases the resis-tance between h and w). the direction of the wiper (state of u/ d ) can be changed at any time as long as the setup and hold times are met.since the max5471/max5472 have the wiper internally connected to h, an increment command increases the resistance between h and gnd, and a decrement com- mand decreases the resistance between h and gnd. the wiper performs a make-before-break transition, ensuring that there is never an open circuit during a transition from one resistor tap to another. when the wiper is at either end of the resistor array (max/min), additional transitions in the direction of the endpoint do not change the counter value (the wiper does not wrap around). storing wiper position the position of the wiper is stored in nonvolatile memo-ry whenever cs transitions low-to-high (rising edge) while inc is high. upon power-up, the wiper returns to this stored position. by keeping inc low while taking cs high, the serial interface can be disabled and the potentiometer placed in standby without storing the lat-est wiper position. the factory-default wiper position is midscale. these devices can also be operated like a one-time programmable (otp) device. once the desired wiper position is trimmed and stored in nonvolatile memory, disable the serial interface by connecting cs to v dd , and inc to gnd. the disabled interface places the device in standby and disallows any changes to thewiper position. in otp mode, these devices become a fixed 3-terminal potentiometer or a 1-terminal resistor to gnd with less than 1? of supply current. cs v w inc t cyc t ci t il t ih t id t di t iw t ic t cph wiper positionstored wiper position not stored t ik note: v w is not a digital signal. it represents a wiper transition. t wsc u/d figure 1. digital interface and timing diagram downloaded from: http:///
max5471/max5472/max5474/max5475 32-tap, nonvolatile, linear-taper digital potentiometers in sot23 8 _______________________________________________________________________________________ standby mode the max5471/max5472/max5474/max5475 arealways in standby mode, except during the transition of a logic input or while the wiper position is being stored. when in standby mode, the static supply current is reduced to less than 1? and the resistive terminals (h, w, and l) are unaffected. applications information the max5471/max5472/max5474/max5475 areintended for circuits requiring digitally controlled adjustable resistance, such as lcd contrast control (where voltage biasing adjusts the display contrast), or programmable filters with adjustable gain and/or cutoff frequency. positive lcd bias control figures 4 and 5 show an application where the voltage-divider or variable resistor is used to make an adjustable, positive lcd-bias voltage. the op amp pro- vides buffering and gain to the resistor-divider network made by the potentiometer (figure 4) or to a fixed resistor and a variable resistor (figure 5). programmable filter figure 6 shows the configuration of a 1st-order pro-grammable filter. the gain of the filter is adjusted by r2, and the cutoff frequency is adjusted by r3. use the following equations to calculate the gain (g) and the 3db cutoff frequency (f c ): g r r f rc c =+ = 1 1 2 1 23 cs u/ di n c w ll decrement lh increment lx no change h x x no change x x no change x l position not stored x h position stored truth table = high-to-low transition. = low-to-high transition. x = don? care. 32-position decoder up/down counter nonvolatile memory v dd gnd inc h 5 2 63 4 r w cs 1 s 32 s 31 s 30 s 3 s 2 s 1 max5471max5472 u/d r 31 r 30 r 2 r 1 figure 2. max5471/max5472 functional diagram 32-position decoder up/down counter nonvolatile memory v dd gnd h 6 3 24 5 r w 1 s 32 s 31 s 30 s 3 s 2 s 1 max5474max5475 u/d r 31 r 30 r 2 r 1 cs inc 7 w 8 l figure 3. max5474/max5475 functional diagram downloaded from: http:///
max5471/max5472/max5474/max5475 32-tap, nonvolatile, linear-taper digital potentiometers in sot23 _______________________________________________________________________________________ 9 max5474max5475 30v 5v h w l v out figure 4. positive lcd bias control using a voltage-divider max5471max5472 30v 5v h gnd v out figure 5. positive lcd bias control using a variable resistor max5471max5472 max5471max5472 h gnd h gnd v out r1 r2 r3 c v in figure 6. programmable filter chip information transistor count: 5031process: bicmos downloaded from: http:///
max5471/max5472/max5474/max5475 32-tap, nonvolatile, linear-taper digital potentiometers in sot23 10 ______________________________________________________________________________________ 6l thin sot23.eps package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) downloaded from: http:///
max5471/max5472/max5474/max5475 32-tap, nonvolatile, linear-taper digital potentiometers in sot23 ______________________________________________________________________________________ 11 package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) downloaded from: http:///
max5471/max5472/max5474/max5475 32-tap, nonvolatile, linear-taper digital potentiometers in sot23 maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2006 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) sot23, 8l.eps 0 0 package outline, sot-23, 8l body 21-0078 g 1 1 marking downloaded from: http:///

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