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general description the max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer offers three end-to-end resis - tance values of 10k, 50k, and 100k. operating from a single +2.6v to +5.5v power supply, the device provides a low 35ppm/c end-to-end temperature coefficient. the max5389 features an up/down interface. the small package size, low supply operating voltage, low supply current, and automotive temperature range of the max5389 make the device uniquely suited for the portable consumer market and battery backup industrial applications. the max5389 is specified over the automotive -40c to +125c temperature range and is available in a 14-pin tssop package. applications audio mixing mechanical potentiometer replacement low-drift programmable filters and ampliiers adjustable voltage references/linear regulators programmable delays and time constants low-voltage battery applications features dual, 256-tap linear taper positions single +2.6v to +5.5v supply operation low (< 1a) quiescent supply current 10k, 50k, 100k end-to-end resistance values up/down interface power-on sets wiper to midscale -40c to +125c operating temperature range 19-5141; rev 3; 9/14 note: all devices are specified over the -40c to +125c operating temperature range+ denotes a lead(pb)-free/rohs-compliant package. part pin-package end-to-end resistance (k?) max5389laud+ 14 tssop 10 max5389maud+ 14 tssop 50 MAX5389NAUD+ 14 tssop 100 u/d latch 256 decoder256 decoder v dd ha hbwb lb wa la por uda udb latch gnd csa csb incb inca max5389 max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer functional diagram ordering information evaluation kit available downloaded from: http:///
v dd to gnd ............................................................-0.3v to +6v h_, w_, l_ to gnd .................................... -0.3v to the lower of (v dd + 0.3v) and +6v all other pins to gnd .............................................-0.3v to +6v continuous current into h_, w_, and l_ max5389l ......................................................................... 5ma max5389m ......................................................................... 2ma max5389n ......................................................................... 1ma continuous power dissipation (t a = +70c) 14-pin tssop (derate 10mw/c above +70c) ......796.8mw operating temperature range ......................... -40c to +125c junction temperature ...................................................... +150c storage temperature range ............................ -65c to +150c lead temperature (soldering, 10s) ................................. +300c soldering temperature (reflow) ....................................... +260c (v dd = +2.6v to +5.5v, v h_ = v dd , v l_ = 0v, t a = -40c to +125c, unless otherwise noted. typical values are at v dd = +5v, t a = +25c.) (note 1) parameter symbol conditions min typ max units resolution n 256 taps dc performance (voltage-divider mode) integral nonlinearity inl (note 2) -0.5 +0.5 lsb differential nonlinearity dnl (note 2) -0.5 +0.5 lsb dual code matching register a = register b -0.5 +0.5 lsb ratiometric resistor tempco (v w /v w )/ t, no load +5 lsb full-scale error code = ffh max5389l -3 -2.5 lsb max5389m -1 -0.5 max5389n -0.5 -0.25 zero-scale error code = 00h max5389l +2.5 +3 lsb max5389m +0.5 +1.0 max5389n +0.25 +0.5 dc performance (variable-resistor mode) (note 3) integral nonlinearity r-inl v dd > +2.6v max5389l 1.0 2.5 lsb max5389m 0.5 1.0 max5389n 0.25 0.8 v dd > +4.75v max5389l 0.4 1.5 max5389m 0.3 0.75 max5389n 0.25 0.5 differential nonlinearity r-dnl v dd 2.6v -0.5 +0.5 lsb dc performance (resistor characteristics) wiper resistance (note 4) r wl v dd > 2.6v 250 600 ? v dd > 4.75v 150 200 terminal capacitance c h_ , c l_ measured to gnd 10 pf wiper capacitance c w_ measured to gnd 50 pf end-to-end resistor tempco tc r no load 35 ppm/c end-to-end resistor tolerance r hl wiper not connected -25 +25 % max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer www.maximintegrated.com maxim integrated 2 absolute maximum ratings 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 downloaded from: http:///
(v dd = +2.6v to +5.5v, v h_ = v dd , v l_ = 0v, t a = -40c to +125c, unless otherwise noted. typical values are at v dd = +5v, t a = +25c.) (note 1) note 1: all devices are 100% production tested at t a = +25c. specifications over temperature limits are guaranteed by design and characterization. note 2: dnl and inl are measured with the potentiometer configured as a voltage-divider (figure 1) with h_ = v dd and l_ = gnd. the wiper terminal is unloaded and measured with a high-input-impedance voltmeter. note 3: r-dnl and r-inl are measured with the potentiometer configured as a variable resistor (figure 1). dn l and inl are mea - sured with potentiometer configured as a variable resistor. h_ is unconnected and l_ = gnd. for v dd = +5v, the wiper ter - minal is driven with a source current of 400a for the 10k configuration, 80a for the 50k configu ration, and 40a for the 100k configuration. for v dd = +2.6v, the wiper terminal is driven with a source current of 200a for the 10k configuration, 40a for the 50k configuration, and 20a for the 100k configuration. note 4: the wiper resistance is the worst value measured by injecting the currents given in note 3 into w_ w ith l_ = gnd. r w = v w - v h )/i w . note 5: drive ha with a 1khz, gnd to v dd amplitude, tone. la = lb = gnd. no load. wb is at midscale with a 10pf load. measure wb. note 6: the wiper-settling time is the worst case 0 to 50% rise time, measured between tap 0 and tap 127. h_ = v dd , l_ = gnd, and the wiper terminal is loaded with 10pf capacitance to ground. note 7: digital timing is guaranteed by design and characterization, not production tested. parameter symbol conditions min typ max units ac performancecrosstalk (note 5) -90 db -3db bandwidth bw code = 80h, 10pf load, v dd = +2.6v max5389l 600 khz max5389m 150 max5389n 75 total harmonic distortion plus noise thd+n measured at w, v h_ = 1v rms at 1khz 0.015 % wiper settling time (note 6) t s max5389l 300 ns max5389m 1000 max5389n 2000 power supplies supply voltage range v dd 2.6 5.5 v standby current digital inputs = v dd or gnd 1 a digital inputs minimum input high voltage v ih 70 % x v dd maximum input low voltage v il 30 % x v dd input leakage current -1 +1 a input capacitance 5 pf timing characteristics (note 7) maximum inc_ frequency f max 10 mhz cs to inc_ setup time t ci 25 ns cs to inc_ hold time t ic 0 ns inc_ low period t il 25 ns inc_ high period t ih 25 ns ud_ to inc_ setup time t di 50 ns ud_ to inc_ hold time t id 0 ns max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer www.maximintegrated.com maxim integrated 3 electrical characteristics (continued) downloaded from: http:///
(v dd = +5v, t a = +25c, unless otherwise noted.) figure 1. voltage-divider and variable resistor configurations h l w w n.c. l supply current vs. digital input voltage digital input voltage (v) supply current (a) 0.5 3.0 5.0 4.5 4.0 1.5 2.5 2.0 1.0 3.5 10 1000 1 100 10,000 0.1 0 max5389 toc02 v dd = 2.6v v dd = 5v supply current vs. supply voltage max5389 toc03 v dd (v) i dd (a) 5.1 4.6 4.1 3.6 3.1 2.6 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 resistance (w-to-l) vs. tap position (10k ? ) tap position w-to-l resistance (k?) 255 204 153 51 102 3 96 11 0 4 10 72 85 1 0 max5389 toc04 resistance (w-to-l) vs. tap position (50k ? ) tap position w-to-l resistance (k?) 255 204 153 51 102 15 4530 55 0 20 5035 10 4025 5 0 max5389 toc05 resistance (w-to-l) vs. tap position (100k ? ) max5389 toc06 tap position resistance (w-to-l) (k ? ) 204 153 102 51 10 20 30 40 50 60 70 80 90 100 110 0 0 255 supply current vs. temperature max5389 toc01 supply current (a) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 temperature (c) 110 95 65 80 -10 5 20 35 50 -25 -40 125 v dd = 5v v dd = 2.6v max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer maxim integrated 4 www.maximintegrated.com typical operating characteristics downloaded from: http:///
(v dd = +5v, t a = +25c, unless otherwise noted.) variable-resistor dnl vs. tap position (100k ? ) max5389 toc11 tap position dnl (lsb) 204 153 102 51 -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 0.10 -0.10 0 255 i wiper = 400a end-to-end resistance % change vs. temperature max5389 toc08 temperature (c) end-to-end resistance % change 110 95 80 65 50 35 20 5 -10 -25 -0.4 -0.3 -0.2 -0.1 0 0.1 -0.5 -40 125 10k ? 50k ? 100k ? variable-resistor inl vs. tap position (10k ? ) max5389 toc12 tap position inl (lsb) 204 153 102 51 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0 -1.0 0 255 i wiper = 400a variable-resistor dnl vs. tap position (10k ? ) max5389 toc09 tap position dnl (lsb) 204 153 102 51 -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 0.10 -0.10 0 255 i wiper = 400a variable-resistor inl vs. tap position (50k ? ) max5389 toc13 tap position inl (lsb) 204 153 102 51 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 255 i wiper = 80a variable-resistor inl vs. tap position (100k ? ) max5389 toc14 tap position inl (lsb) 204 153 102 51 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 255 i wiper = 400a voltage-divider dnl vs. tap position (10k ? ) max5389 toc15 tap position dnl (lsb) 204 153 102 51 -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 0.10 -0.10 0 255 variable-resistor dnl vs. tap position (50k ? ) max5389 toc10 tap position dnl (lsb) 204 153 102 51 -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 0.10 -0.10 0 255 i wiper = 80a wiper resistance vs. wiper voltage (10k ? ) wiper voltage (v) wiper resistance (?) 0.5 3.0 5.0 4.5 4.0 1.5 2.5 2.0 1.0 3.5 110 150 90 130 190170 210 70 0 max5389 toc07 v dd = 2.6v v dd = 5v max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer maxim integrated 5 www.maximintegrated.com typical operating characteristics (continued) downloaded from: http:///
(v dd = +5v, t a = +25c, unless otherwise noted.) voltage-divider inl vs. tap position (100k ? ) max5389 toc20 tap position inl (lsb) 204 153 102 51 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 255 voltage-divider dnl vs. tap position (100k ? ) max5389 toc17 tap position dnl (lsb) 204 153 102 51 -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 0.10 -0.10 0 255 tap-to-tap switching transient (code 127 to 128) 10k ? 400ns/div inc5v/div v w-l 20mv/div max5389 toc21 voltage-divider inl vs. tap position (10k ? ) max5389 toc18 tap position inl (lsb) 204 153 102 51 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 255 voltage-divider inl vs. tap position (50k ? ) max5389 toc19 tap position inl (lsb) 204 153 102 51 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 255 voltage-divider dnl vs. tap position (50k ? ) max5389 toc16 tap position dnl (lsb) 204 153 102 51 -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 0.10 -0.10 0 255 max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer maxim integrated 6 www.maximintegrated.com typical operating characteristics (continued) downloaded from: http:///
(v dd = +5v, t a = +25c, unless otherwise noted.) crosstalk vs. frequency max5389 toc26 frequency (khz) crosstalk (db) 100 10 1 0.1 -120 -100 -80 -60 -40 -20 0 -140 0.01 1000 max5389l max5389m max5389n tap-to-tap switching transient (code 127 to 128) 100k ? 1s/div v w-l 20mv/div max5389 toc23 inc5v/div total harmonic distortion plus noise vs. frequency max5389 toc27 frequency (khz) thd+n (%) 10 1 0.10 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0 0.01 100 max5389l max5389m max5389n power-on wiper transient (code 0 to 128) 2s/div v dd 2v/div output w2v/div max5389 toc24 midscale frequency response max5389 toc25 frequency (khz) gain (db) 1,000 100 10 1 0.1 -20 -10 0 10 -30 0.01 10,000 v in = 1v p-p c w = 10pf max5389l max5389m max5389n tap-to-tap switching transient (code 127 to 128) 50k ? 400ns/div inc5v/div v w-l 20mv/div max5389 toc22 max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer maxim integrated 7 www.maximintegrated.com typical operating characteristics (continued) downloaded from: http:///
pin name function 1 csa active-low register a chip-select input. drive csa low to change wiper position wa through inca and uda. 2 uda register a up/down control input. with uda low, a high-to-low transition at inca decrements the wa position towards la. with uda high, a high-to-low transition at inca increments wa position toward ha. 3 udb register b up/down control input. with udb low, a high-to-low transition at incb decrements the wb position towards lb. with udb high, a high-to-low transition at incb increments wb position toward hb. 4 v dd power-supply input. bypass v dd to gnd with a 0.1f capacitor close to the device. 5 wa resistor a wiper terminal 6 ha resistor a high terminal. the voltage at ha can be higher or lower than the voltage at la. current c an low into or out of ha. 7 la resistor a low terminal. the voltage at la can be higher or lower than the voltage at ha. current ca n low into or out of la. 8 lb resistor b low terminal. the voltage at lb can be higher or lower than the voltage at hb. current ca n low into or out of lb. 9 hb resistor b high terminal. the voltage at hb can be higher or lower than the voltage at lb. current c an low into or out of hb. 10 wb resistor b wiper terminal 11 gnd ground 12 incb register b wiper increment control input. with udb low, a high-to-low transition at incb decrements the wb position towards lb. with udb high, a high-to-low transition at incb increments wb position toward hb. 13 inca register a wiper increment control input. with uda low, a high-to-low transition at inca decrements the wa position towards la. with uda high, a high-to-low transition at inca increments wa position toward ha. 14 csb active-low register b chip-select input. drive csb low to change wiper position wa through incb and udb. incbgnd v dd 1 + 2 1413 csbinca udaudb csa top view 34 1211 hblb la 5 10 wb wa ha 6 7 98 max5389 max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer www.maximintegrated.com maxim integrated 8 pin description pin conigurationpin description pin coniguration downloaded from: http:///
detailed description the max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer offers three end-to-end resis - tance values of 10k, 50k, and 100k. the potenti - ometer consists of 255 fixed resistors in series between terminals h_ and l_. the potentiometer wiper, w_, is programmable to access any one of the 256 tap points on the resistor string. on power-up, the wiper position is set to midscale (tap 128). the potentiometers are programmable independent of each other. the max5389 features an up/down interface. up/down interface logic inputs cs_ , ud_, and inc_ determine the wiper position of the device (table 1). with cs_ low and ud_ high, a high-to-low (falling edge) transition on inc_ incre - ments the internal counter which moves the wiper, w_, closer to h_. when both cs_ and ud_ are low, the falling edge of inc_ decrements the internal counter and moves the tap point, w_ closer to l_ (figure 2). the wiper per - forms a make-before-break transition ensuring that w_ is never disconnected from the resistor string during a tran - sition from one tap point to another. when the wiper is at either end of the resistor array additional transitions in the direction of the end point do not change the counter value. table 1. up/down control table figure 2. up/down interface timing diagram cs_ ud_ inc_ w_ h x x no change l l no change l h no change l l a decrement l h a increment x = dont care. = low-to-high transition. = high-to-low transition. ud_ w_ inc_ cs_ t ci t di t id t iw t ic t il t ih max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer www.maximintegrated.com maxim integrated 9 downloaded from: http:///
applications information variable gain ampliier figure 3 shows a potentiometer adjusting the gain of a noninverting amplifier. figure 4 shows a potentiometer adjusting the gain of an inverting amplifier. adjustable dual linear regulator figure 5 shows an adjustable dual linear regulator using a dual potentiometer as two variable resistors. adjustable voltage reference figure 6 shows an adjustable voltage reference circuit using a potentiometer as a voltage-divider. figure 3. variable gain noninverting amplifier v in v out h l w v in v out h l w v out1 v out2 out1out2 set1set2 in v+ l l h h w w max8866 out in +5v v ref gnd l h w max6160 figure 5. adjustable dual linear regulator figure 6. adjustable voltage reference figure 4. variable gain inverting amplifier max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer www.maximintegrated.com maxim integrated 10 downloaded from: http:///
variable gain current to voltage converter figure 7 shows a variable gain current to voltage con - verter using a potentiometer as a variable resistor. lcd bias control figure 8 shows a positive lcd bias control circuit using a potentiometer as a voltage-divider. figure 9 shows a positive lcd bias control circuit using a potentiometer as a variable resistor programmable filter figure 10 shows a programmable filter using a dual potentiometer. offset voltage adjustment circuit figure 11 shows an offset voltage adjustment circuit using a dual potentiometer figure 7. variable gain i-to-v converter figure 9. positive lcd bias control using a variable resistor figure 10. programmable filter figure 8. positive lcd bias control using a voltage-divide l r1 r2 r3 v out i s h w v out = - i s x ((r3 x (1 + r2/r1)) + r2) l v out h w +5v l v out h w +5v v out v in la ha wb lb hb r2 r1 r3 wa max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer www.maximintegrated.com maxim integrated 11 downloaded from: http:///
figure 11. offset voltage adjustment circuit package type package code outline no. land pattern no. 14 tssop u14+1 21-0066 90-0113 v out lb hb wb wa la ha +5v max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer www.maximintegrated.com maxim integrated 12 package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. process information process: bicmos downloaded from: http:///
revision number revision date description pages changed 0 1/10 initial release 1 4/10 added soldering temperature in absolute maximum ratings ; corrected code in conditions of -3db bandwidth speciication in electrical characteristics; corrected table 1 and figure 5 2, 3, 9, 10 2 11/10 updated electrical characteristics table globals, updated drawings for optimal circuit operation 2, 3, 10, 11, 12 3 9/14 removed automotive reference from data sheet 1 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 speciications without n otice 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. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. max5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer ? 2014 maxim integrated products, inc. 13 revision history for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///

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