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general description the max5527/max5528/max5529 linear-taper digital potentiometers perform the same function as mechanical potentiometers, replacing the mechanics with a simple 2-wire up/down digital interface. these digital poten- tiometers provide an optional one-time programmable feature that sets the power-on reset position of the wiper. once the wiper position is programmed, the 2-wire inter- face can be disabled to prevent unwanted adjustment. the max5527/max5528/max5529 provide an end-to-end resistance of 100k ? , 50k ? , and 10k ? , respectively. the devices feature low temperature coefficients of 35ppm/ c end-to-end and 5ppm/ c ratiometric. all devices offer 64 wiper positions and operate from a single +2.7v to +5.5v supply. an ultra-low, 0.25? (typ) standby supply current saves power in battery-operated applications. the max5527/max5528/max5529 are available in 3mm x 3mm, 8-pin tdfn and 5mm x 3mm, 8-pin ?ax packages. each device is guaranteed over the -40 c to +105 c temperature range. applications products using one-time factory calibration mechanical potentiometer replacements features wiper position stored after one-time fuse programming 64 tap positions wiper position programmed through simple 2-wire up/down interface 35ppm/ c end-to-end temperature coefficient 5ppm/ c ratiometric temperature coefficient ultra-low 1.5 a (max) static supply current +2.7v to +5.5v single-supply operation 10k?, 50k?, and 100k? end-to-end resistances tiny, 3mm x 3mm, 8-pin tdfn and 5mm x 3mm, 8-pin max packages max5527/max5528/max5529 one-time programmable, linear-taper digital potentiometers ________________________________________________________________ maxim integrated products 1 ordering information 19-3665; rev 1; 7/09 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. evaluation kit available part pin-package resistance (k ? ) top mark max5527 gta+ 8 tdfn-ep* 100 aog max5527gua+ 8 ?ax 100 max5528 gta+ 8 tdfn-ep* 50 aoh max5528gua+ 8 ?ax 50 max5529 gta+ 8 tdfn-ep* 10 aoi max5529gua+ 8 ?ax 10 + denotes a lead(pb)-free/rohs-compliant package. * ep = exposed pad. note : all devices are specified over the -40c to +105? operat- ing temperature range. 1 h v dd cs gnd max tdfn* top view 2 3 4 l u/ d pv 8 7 6 5 w *exposed paddle. connect to gnd. max5527 max5528 max5529 1 h v dd cs gnd 23 4 l u/ d pv 87 6 5 w max5527 max5528 max5529 pin configurations ?ax is a registered trademark of maxim integrated products, inc. functional diagram max5527 max5528 max5529 64- position decoder up/down counter one-time program block v dd gnd cs u/ d pv l h w r 62 r 61 r 1 r 0 s 63 s 62 s 61 s 2 s 1 s 0 r w
max5527/max5528/max5529 one-time programmable, linear-taper digital potentiometers 2 _______________________________________________________________________________________ absolute maximum ratings 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. v dd to gnd ...........................................................-0.3v to +6.0v pv to gnd ...........................................................-0.3v to +12.0v all other pins to gnd.................................-0.3v to (v dd + 0.3v) maximum continuous current into h, l, and w max5527 ......................................................................?.5ma max5528 ......................................................................?.0ma max5529 ......................................................................?.0ma continuous power dissipation (t a = +70?) 8-pin ?ax (derate 4.5mw/? above +70?) ..............362mw 8-pin tdfn (derate 18.2mw/? above +70?) .......1454.5mw operating temperature range .........................-40? to +105? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? electrical characteristics (v dd = +2.7v to +5.5v, v h = v dd , v l = gnd, t a = -40 c to +105 c, unless otherwise noted. typical values are at v dd = +5.0v, t a = +25 c.) (note 1) parameter symbol conditions min typ max units dc performance resolution 64 taps max5527 75 100 125 max5528 37.5 50 62.5 end-to-end resistance max5529 7.5 10 12.5 k ? end-to-end resistance temperature coefficent tc r 35 ppm/ c max5527/max5528 5 resistance ratio temperature coefficient max5529 10 ppm/ c integral nonlinearity inl potentiometer configuration, no load, figure 1 ?.025 ? lsb differential nonlinearity dnl potentiometer configuration, no load, figure 1 ?.01 ? lsb full-scale error potentiometer configuration, no load, figure 1 -0.005 -1 lsb zero-scale error potentiometer configuration, no load, figure 1 +0.006 +1 lsb v dd 3v 90 200 wiper resistance (note 2) r w v dd < 3v 125 650 ? dynamic characteristics max5527 100 max5528 200 wiper -3db bandwidth (note 3) max5529 1000 khz max5527 -78 max5528 -82 total harmonic distortion f = 10khz, midscale, 1v rms r l = 100k ? max5529 -94 db
max5527/max5528/max5529 one-time programmable, linear-taper digital potentiometers _______________________________________________________________________________________ 3 electrical characteristics (continued) (v dd = +2.7v to +5.5v, v h = v dd , v l = gnd, t a = -40 c to +105 c, unless otherwise noted. typical values are at v dd = +5.0v, t a = +25 c.) (note 1) parameter symbol conditions min typ max units digital inputs ( cs , u/ d ) input high voltage v ih 0.7 x v dd v input low voltage v il 0.3 x v dd v input current i in ?.1 1 a input capacitance c in 5pf timing characteristics (note 4) u/ d mode to cs setup time t cu figures 2 and 3 50 ns u/ d mode to cs hold time t ci figures 2 and 3 50 ns cs to u/ d step hold time t ic figures 2 and 3 0 ns u/ d step low time t il figures 2 and 3 100 ns u/ d step high time t ih figures 2 and 3 100 ns wiper settling time t iw c l = 0pf, figures 2 and 3 (note 5) 400 ns pv rising edge to cs falling edge t pc figure 5 1 ms cs falling edge to pv falling edge t cp figure 5 5 ms cs step low time t cl figure 5 5 ms cs step high time t ch figure 5 5 ms pv falling edge to cs rising edge t ph figure 5 1 ms u/ d frequency f u/ d max 5mhz power-up time t up (note 6) 1 ms power supply supply voltage v dd 2.7 5.5 v static supply current i dd cs = u/ d = gnd or v dd 1.5 ? t a < +50? 10.45 11.55 programming voltage pv t a +50? 11.00 11.55 v programming current i pv v pv = 11v 4 5 ma note 1: all devices are production tested at t a = +25?, and are guaranteed by design for t a = -40? to +105?. note 2: the wiper resistance is measured by driving the wiper terminal with a source of 20? for the max5527, 40? for the max5528, and 200? for the max5529. note 3: wiper at midscale with a 10pf load. note 4: digital timing is guaranteed by design, not production tested. note 5: wiper setting time is measured for a single step from u/ d transition until wiper voltage reaches 90% of final value. note 6: power-up time is the period of time from when the power supply is applied, until the serial interface is ready for writing.
max5527/max5528/max5529 one-time programmable, linear-taper digital potentiometers 4 _______________________________________________________________________________________ typical operating characteristics (v dd = +5.0v, t a = +25 c, unless otherwise noted.) max5527 r-dnl error vs. wiper position max5527 toc01 wiper position r-dnl error (lsb) 48 32 16 -0.005 0 0.005 0.010 -0.010 064 max5527 r-inl error vs. wiper position max5527 toc02 wiper position r-inl error (lsb) 48 32 16 -0.005 0 0.005 0.010 -0.010 064 max5528 r-dnl error vs. wiper position max5527 toc03 wiper position r-dnl error (lsb) 48 32 16 -0.005 0 0.005 0.010 -0.010 064 max5528 r-inl error vs. wiper position max5527 toc04 wiper position r-inl error (lsb) 48 32 16 -0.005 0 0.005 0.010 -0.010 064 max5529 r-dnl error vs. wiper position max5527 toc05 wiper position r-dnl error (lsb) 48 32 16 -0.005 0 0.005 0.010 -0.010 064 max5529 r-inl error vs. wiper position max5527 toc06 wiper position r-inl error (lsb) 48 32 16 -0.005 0 0.005 0.010 -0.010 064 wiper resistance vs. wiper voltage max5527 toc07 wiper voltage (v) wiper resistance ( ? ) 4 3 2 1 25 50 75 100 125 150 0 05 v dd = 3v v dd = 5v max5527: v dd = 5v, i source = 50 a v dd = 3v, i source = 30 a max5528: v dd = 5v, i source = 100 a v dd = 3v, i source = 60 a max5529: v dd = 5v, i source = 500 a v dd = 3v, i source = 300 a end-to-end resistance percentage change vs. temperature max5527 toc08 temperature ( c) end-to-end resistance change (%) 85 60 -15 10 35 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 -0.4 -40 110 w-to-l resistance vs. wiper position w-to-l resistance (k ? ) 10 20 30 40 50 60 70 80 90 100 0 max5527 toc09 wiper position 48 32 16 064 max5527 max5528 max5529
max5527/max5528/max5529 one-time programmable, linear-taper digital potentiometers _______________________________________________________________________________________ 5 static supply current vs. temperature max5527 toc10 temperature ( c) supply current (na) 85 60 35 10 -15 50 100 150 200 250 300 0 -40 110 v dd = 5v v dd = 3v cs = u/ d = gnd static supply current vs. supply voltage max5527 toc11 supply voltage (v) supply current (na) 5.0 4.5 4.0 3.5 3.0 50 100 150 200 250 300 0 2.5 5.5 cs = u/ d = gnd supply current vs. digital input voltage max5527 toc12 digital input voltage (v) supply current ( a) 5 4 3 2 1 0.1 1 10 100 1000 0.01 06 v dd = 5v v dd = 3v midscale wiper response vs. frequency max5527 toc13 frequency (khz) gain (db) 1000 100 10 1 -15 -12 -9 -6 -3 0 -18 0.1 10,000 max5527 max5528 max5529 total harmonic distortion vs. frequency max5527 toc14 frequency (khz) thd (db) 10 1 0.1 -100 -90 -80 -70 -60 -50 -40 -110 0.01 100 max5527 max5528 max5529 midscale, 1v rms , r l = 100k ? tap-to-tap switching transient max5527 toc15 400ns u/ d 2v/div gnd output w 50mv/div typical operating characteristics (continued) (v dd = +5v, t a = +25?, unless otherwise noted.)
max5527/max5528/max5529 one-time programmable, linear-taper digital potentiometers 6 _______________________________________________________________________________________ max5527 power-up wiper transient max5527 toc17 2 s v dd 2v/div gnd gnd output w 2v/div max5528 power-up wiper transient max5527 toc18 1 s v dd 2v/div gnd gnd output w 2v/div max5529 power-up wiper transient max5527 toc19 2 s v dd 2v/div gnd gnd output w 2v/div tap-to-tap switching transient max5527 toc16 400ns u/ d 2v/div gnd output w 50mv/div typical operating characteristics (continued) (v dd = +5v, t a = +25?, unless otherwise noted.)
max5527/max5528/max5529 detailed description the max5527/max5528/max5529 100k ? /50k ? /10k ? end-to-end resistance digitally-controlled potentiome- ters offer 64 wiper tap positions accessible along the resistor array between h and l. these devices function as potentiometers or variable resistors (see figure 1). the wiper (w) position is adjusted sequentially through the tap positions using a simple 2-wire up/down inter- face. these digital potentiometers provide an optional one-time programmable feature that sets and locks the power-on reset position of the wiper (see the pv one- time programming section). once the desired wiper position is programmed, the 2-wire interface can be disabled to prevent unwanted adjustment. digital interface operation the max5527/max5528/max5529 provide two modes of operation when the serial interface is active: incre- ment mode or decrement mode. the serial interface is only active when cs is low. the cs and u/ d inputs control the position of the wiper along the resistor array. set u/ d high to increment the max5527/max5528/max5529 when cs transitions from high to low (figure 2). set u/ d low to decrement the max5527/max5528/max5529 when cs transitions high to low (figure 3). once cs is held low, each low- to-high transition at u/ d increments or decrements the wiper one position. once the increment or decrement mode is set, the device remains in that mode until cs goes high. idle u/ d high for normal operation. if u/ d is low when cs transitions low to high, the wiper moves one addi- tional tap in its present direction. the wiper remains in the same position when u/ d is high and cs transitions low to high. after cs returns high, the wiper position remains the same (figure 4). additional increments do not change the wiper position when the wiper is at the maximum end of the resistor array. additional decrements do not change the wiper position when the wiper is at the minimum end of the resistor array. h l h l w potentiometer configuration variable-resistor configuration w figure 1. potentiometer/variable-resistor configuration pin description pin name function 1 w wiper connection 2 cs chip-select input. a high-to-low cs transition determines the increment/decrement mode. increment if u/ d is high, or decrement if u/ d is low. cs is also used for one-time programming. see the pv one- time programming section. 3v dd supply voltage. bypass with a 0.1? capacitor to gnd. 4 gnd ground 5pv one-time programming voltage. connect pv to an 11v supply at the time the device is programmed/locked, and bypass with a 22? capacitor to gnd. for normal operation, connect to gnd or leave floating. 6u/ d up/down control input. when cs is low, a low-to-high transition at u/ d increments or decrements the wiper position. see the digital interface operation section. 7 l resistor low terminal 8 h resistor high terminal ?p exposed pad (tdfn only). internally connected to gnd. connect to a large ground plane to maximize thermal dissipation. one-time programmable, linear-taper digital potentiometers _______________________________________________________________________________________ 7
max5527/max5528/max5529 one-time programmable, linear-taper digital potentiometers 8 _______________________________________________________________________________________ pv one-time programming the max5527/max5528/max5529 power up and func- tion after power-up with the wiper position set in one of three ways: 1) factory default power-up position, midscale, adjustable wiper 2) a newly programmed power-up position, adjustable wiper 3) a new programmed power-up position, locked wiper the wiper is set to the factory default position at power- up (midscale, tap 31). connect pv to gnd or leave floating to continue powering up the wiper position at midscale. see table 1 for the default and one-time pro- gramming options. v dd u/ d cs v w t cu t ci t il t ih t ic t up t iw figure 2. increment-mode timing diagram v dd u/ d cs v w t cu t ci t ih t il t ic t up t iw figure 3. decrement-mode timing diagram u/ d cs v w wiper remains the same with u/ d high and cs rising wiper changes with u/ d low and cs rising figure 4. cs low-to-high transition timing diagram
max5527/max5528/max5529 one-time programmable, linear-taper digital potentiometers _______________________________________________________________________________________ 9 change the wiper? power-up position using the pv one-time programming sequence after power-up (see figure 5). after setting the wiper to the desired power- up position, perform the following six-step sequence: 1) set u/ d and cs high. 2) connect an external voltage source at pv in the range of +11v to +11.55v. 3) pull cs low. 4a) pulse cs high for six cycles, consisting of cs starting low and going high for at least t ch, and then low for at least t cl , to change the wiper power-up position. the wiper remains adjustable. 4b) pulse cs high for seven cycles, consisting of cs starting low and going high for at least t ch and then low for at least t cl , to change the wiper power-up position and lock the wiper in that same position. the seventh cs pulse is labeled the optional lock- out bit in figure 5. 5) connect pv to gnd or release the voltage source, leaving pv floating. 6) pull cs high. pulse cs high for six cycles to change the wiper power- up position. the wiper position returns to this pro- grammed position on power-up, but remains adjustable. pulse cs high for seven cycles to lock the max5527/ max5528/max5529 to a specific wiper position with no further adjustments allowed. this effectively converts the potentiometer to a fixed resistor-divider. the sev- enth pulse locks the wiper position and disables the up/down interface. once locked, connect u/ d and cs high, low, or leave them floating without increasing the supply current (see table 1). if six clock pulses are used, the interface is enabled and the device can be put into program mode again. however, the part uses one-time programmable (otp) memory and should be programmed only once. if the part is programmed more than once, all applied values are ored together. thus, if 010101 is programmed the first time and 101010 is programmed the second time, the result will be 111111. the external pv power supply must source at least 5ma and have a good transient response. decouple the pv power supply with a 22? capacitor to gnd. ensure that no more than 250? of inductance and/or 40 ? of para- sitic resistance exists between the capacitor and the device (see figure 6). pv cs +11v 0v t pc 6 pulses record wiper position optional 7th lockout bit t ch t cl t cp t ph u/ d figure 5. one-time program mode, serial-interface timing diagram 11v 22 f l parasitic < 250 h r parasitic < 40 ? trace parasitics pv max5527 max5528 max5529 figure 6. pv power-supply decoupling mode power-on reset wiper position adjustable wiper factory default (unprogrammed) tap 31 yes programmed by six cs pulses programmed position yes programmed by seven cs pulses programmed position no table 1. one-time programming options
max5527/max5528/max5529 one-time programmable, linear-taper digital potentiometers 10 ______________________________________________________________________________________ applications information use the max5527/max5528/max5529 in applications requiring digitally controlled adjustable resistance, such as lcd contrast control where voltage biasing adjusts the display contrast, or for programmable filters with adjustable gain and/or cutoff frequency. positive lcd bias control figures 7 and 8 show an application where the voltage- divider or variable resistor is used to make an adjustable, positive lcd bias voltage. the op-amp provides buffer- ing and gain to the resistor-divider network made by the potentiometer (figure 7), or to a fixed resistor and a variable resistor (figure 8). programmable filter figure 9 shows the configuration for 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 ), only up to frequencies one decade below the wiper -3db bandwidth. adjustable voltage reference figure 10 shows the max5527/max5528/max5529 used as the feedback resistors in an adjustable-voltage reference application. g r r f xr xc c =+ = 1 1 2 1 23 v out 30v 5v w h l max5527 max5528 max5529 figure 7. positive lcd bias control using a voltage-divider v out 30v 5v w h l max5527 max5528 max5529 figure 8. positive lcd bias control using a variable resistor v out r1 w h l r2 v in r3 h w l c max5527 max5528 max5529 5v figure 9. programmable filter w h l max6160 +5v gnd v in out adj v 0 ref v 0 = 1.23v x 100k ? for the max5527 r 2 (k ? ) v 0 = 1.23v x 50k ? for the max5528 r 2 (k ? ) r 1 r 2 max5527 max5528 max5529 v 0 = 1.23v x 10k ? for the max5529 r 2 (k ? ) figure 10. adjustable voltage reference
max5527/max5528/max5529 one-time programmable, linear-taper digital potentiometers ______________________________________________________________________________________ 11 layout and power-supply considerations proper layout and power-supply bypassing can affect device performance. bypass v dd with a 0.1? capacitor as close to the device as possible. when programming the wiper position, bypass pv with a 22? capacitor as close to the device as possible. for a v dd power supply with a slew rate greater than 1v/? or in applications where power-supply overshoot is prevalent, connect a 10 ? resistor in series to v dd and bypass v dd with an additional 4.7? capacitor to ground. chip information transistor count: 3420 process: bicmos package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a "+", "#", or "-" in the package code indicates rohs status only. package draw- ings may show a different suffix character, but the drawing per- tains to the package regardless of rohs status. package type package code document no. 8 tdfn-ep t833+2 21-0137 8 ?ax u8+1 21-0036
max5527/max5528/max5529 one-time programmable, linear-taper digital potentiometers 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. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 5/05 initial release 1 7/09 added lead-free note to the ordering information . added exposed pad information to the pin description . added text to pv one-time programming section. 1, 7, 9

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