general description the max5490 precision resistor-divider consists of twoaccurately matched resistors with access to the ends and center of the divider. this device offers excellent resistance matching of 0.035% (a grade), 0.05% (b grade), and 0.1% (c grade). the max5490 provides an extremely low resistance-ratio temperature drift of 1ppm/? (typ) over -55? to +125?, and has an end-to- end resistance of 100k ? . resistance ratios from 1:1 to 100:1 are available. five standard ratios are available(see table 1), and custom ratios are also available upon request. the max5490 is ideal for precision gain-setting applications where tight resistance matching and low temperature drift are necessary. the max5490 is available in a space-saving 3-pin sot23 package, and is guaranteed over the military -55? to +125? temperature range. applications industrial process controlinstrumentation precision gain setting medical equipment automatic test equipment base stations features ? resistance ratios from 1:1 to 100:1 ? custom ratios available upon request ? tight initial ratio accuracy 0.035% (max5490a)0.05% (max5490b) 0.1% (max5490c) ? low 1ppm/ c (typ) resistor-ratio-drift ? up to 80v operating voltage across sum of r1and r2 ? tiny 3-pin sot23 package max5490 100k ? precision-matched resistor-divider in sot23 ________________________________________________________________ maxim integrated products 1 p2 1 3 p3 p1 max5490 sot23 top view 2 pin configuration ordering information* p1p2 p3 max5490 r 2 r 1 block diagram 19-3337; rev 2; 3/05 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. * see the how to order section for more details. pa r t t em p r a n g e pin - pa c k a g e r a t io a c c u r a c y ( % ) m ax 5490 _ a _ _ _ _ _ - t- 55 c to + 125 c 3 s o t23- 3 0.035 m ax 5490 _ b _ _ _ _ _ - t- 55 c to + 125 c 3 s o t23- 3 0.05 m ax 5490 _ c _ _ _ _ _ - t- 55 c to + 125 c 3 s o t23- 3 0.1 downloaded from: http:///
max5490 100k ? precision-matched resistor-divider in sot23 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics(t a = -55? to +125?, unless otherwise noted. typical values are at t a = +25?.) (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. voltage between p1 and p2.................................................100v maximum current into any pin ......................................?.00ma continuous power dissipation (t a = +70?) 3-pin sot23 (derate 7.1mw/? above +70?).........571.4mw 3-pin sot23 ( j-a ) .....................................................141?/w operating temperature range .........................-55? to +125? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units max5490_a, t a = +25? ?.035 max5490_b, t a = +25? ?.05 initial resistor ratio error (note 2) max5490_c, t a = +25? ?.1 % 1:1 ratio 10:1 1 2 resistance-ratio temperaturecoefficient (note 3) 10:1 ratio 25:1 2 4 ppm/? absolute temperature coefficientof resistance tcr (note 4) 35 ppm/? voltage coefficient of resistance vcr (note 5) 0.1 ppm/v end-to-end resistance (r 1 + r 2 )t a = +25? 95 100 105 k ? continuous working voltagebetween p1 and p2 v p1-p2 -80 +80 v continuous current i r1 , i r2 840 ? p1, p2, p3 capacitance 2p f maximum power rating 67.2 mw resistance ratio long-termstability 2000 hours at +70 c 0.03 % -3db bandwidth f 3db 1:1 ratio (note 6) 3 mhz thermal noise 45 ? rms current noise in accordance with mil-std-2020method 30b -25 db note 1: the max5490 is 100% production tested at t a = +25?. specifications over -55? to +125? are guaranteed by design and characterization. note 2: testing conditions: t a = +25?, v p1-p2 = 10v and 80v. note 3: resistance-ratio temperature coefficient is defined asfor ratios from 25:1 to 100:1, contact factory. note 4: absolute tcr is defined as ? ? r r r r t 1 2 1 2 ?? ? ?? ? ? ? rr rr t 12 12 + () + () and is guaranteed by design, not production tested. and is tested at 10v and 80v. downloaded from: http:///
max5490 100k ? precision-matched resistor-divider in sot23 _______________________________________________________________________________________ 3 95 65 -25 5 35 -20 -10 0 10 20 30 40 50 -30 -55 125 normalized resistance-ratio drift vs. temperature max5490 toc01 temperature ( c) ratio drift (ppm) v p1-p2 = 10v ratio 1:1 -80 -40 0 40 80 120 160 -120 95 65 -25 5 35 -55 125 normalized resistance-ratio drift vs. temperature max5490 toc02 temperature ( c) ratio drift (ppm) v p1-p2 = 10v ratio 10:1 95 65 -25 5 35 -150 -100 -50 0 50 100 150 200 -200 -55 125 normalized resistance-ratio drift vs. temperature max5490 toc03 temperature ( c) ratio drift (ppm) v p1-p2 = 10v ratio 25:1 -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 02 04 06 0 7 0 10 30 50 80 resistance-ratio accuracy vs. voltage max5490 toc04 voltage (v) ratio accuracy (%) ratio 25:1 0.1 10 1 100 1000 frequency response max5490 toc05 frequency (khz) response (db) 6 -18 -12 -9 -3 3 -15 -6 0 1:1 ratio c l = 10pf typical operating characteristics (v p1-p2 = 10v, t a = +25?, unless otherwise noted.) note 5: resistance-ratio voltage coefficient is defined as ? ? r r r r v 1 2 1 2 ?? ? ?? ? and is guaranteed by design, not production tested. note 6: calculate bandwidth by using 1 2 rc , where c = c p3 and r rr rr = + 12 12 . dc electrical characteristics (continued)(t a = -55? to +125?, unless otherwise noted. typical values are at t a = +25?.) (note 1) downloaded from: http:///
max5490 100k ? precision-matched resistor-divider in sot23 4 _______________________________________________________________________________________ detailed description as shown in the block diagram , the max5490 consists of two precision, low-ratio-drift resistors with an end-to-end resistance of 100k ? (r 1 + r 2 ). p3 is the set point of the divider. the maximum working voltage of themax5490 is 80v. this device offers a wide range of resistance ratios (r 1 /r 2 ) from 1:1 to 100:1 and is ideal for precision operational amplifier gain/attenuation con-trol. a maximum initial ratio accuracy of 0.035% and a low 1ppm/ c ratio drift enhance system accuracy. applications information self-heating and error applying a voltage across terminals p1 and p2 causesthe device to heat up due to power dissipation. in high- voltage applications, consider the error in resistance- ratio temperature coefficient caused by self-heating. the worst-case self-heating occurs when the operatingvoltage attains its maximum value. approximate the result of power dissipation under this condition as: the thermal resistance from junction to ambient, j-a , for a 3-pin sot23 package is 141?/w. calculate theresulting temperature rise as: ? t = 64mw x 141?/w = 9.02? if the ratio temperature coefficient is 1ppm/? (typ), thetotal error introduced by self-heating is: 9.02 c x 1ppm/ c = 9.02ppm p v r v k mw diss max = () = () = 22 80 100 64 ? pin description pin name function 1p 1 r 1 connection terminal 2p 2 r 2 connection terminal 3 p3 set-point connection terminal 1000 10 1 100 1k 100 frequency (hz) noise (nv/ hz ) 10 spectral noise density max5490 toc06 ratio 1:1signal connected to p2 p1 grounded v p1-p2 = 10v v p1-p2 = 2v 100 10 1 0.1 0.01 0.001 0.0001 10 1k 10k 100 100k total harmonic distortion plus noise response max5490 toc07 frequency (hz) thd+n (%) 1:1 ratio20hz to 20khz bandpass typical operating characteristics (continued) (v p1-p2 = 10v, t a = +25?, unless otherwise noted.) downloaded from: http:///
max5490 100k ? precision-matched resistor-divider in sot23 _______________________________________________________________________________________ 5 in p1 p2 p3 max5490 r 2 r 1 out figure 3. buffered attenuator max5490 r 2 r 1 p1 p2 p3 in out figure 1. inverting amplifier configuration p1 p2 p3 max5490 r 2 r 1 out in figure 4. attenuator with buffer max5490 r 2 r 1 p1 p2 p3 in out figure 2. noninverting amplifier configuration a v v r r out in == 1 2 a v v r r out in == + 1 1 2 a v v r rr out in == + 2 12 a v v r rr out in == + 2 12 typical applications downloaded from: http:///
max5490 100k ? precision-matched resistor-divider in sot23 6 _______________________________________________________________________________________ prefix max 5490 v a 10000 -t root part numbermax5490 = 100k ? end-to-end ratio rangel through w. resistor ratio must fall in the appropriate ratio range. (see table 2.) ratio accuracya = 0.035% (max); b = 0.05% (max); c = 0.1% (max) resistance ratio five number ratio designator. ratios available from 1:1 to 100:1. format examples: 01000 = 1:1 02500 = 2.5:1 07538 = 7.538:1 00000 = 100:1 tape and reel how to order example part numbers part number resistor-ratio range resistor-ratio accuracy (% max) resistor ratio max5490pa02500-t 2.000 to 2.999 0.035 2.5:1 max5490rb03000-t 3.000 to 3.999 0.05 3:1 max5490ua07538-t 7.538 to 9.999 0.035 7.538:1 max5490vc10000-t 10.000 to 19.999 0.1 10:1 downloaded from: http:///
max5490 100k ? precision-matched resistor-divider in sot23 _______________________________________________________________________________________ 7 table 2. ratio ranges letter suffix resistor-ratio range g 1.0 to 1.099 h 1.1 to 1.199 j 1.2 to 1.399 k 1.4 to 1.599 l 1.6 to 1.899 m 1.9 to 2.099 n 2.1 to 2.499 p 2.5 to 2.999 r 3.0 to 3.499 s 3.5 to 4.499 t 4.5 to 5.999 u 6.0 to 8.999 v 9.0 to 13.999 w 14.0 to 24.999 x 25.0 to 49.999 y 50.0 to 74.999 z 75.0 to 100.0 chip information transistor count: 0process: bicmos table 1. standard ratios* part number resistor ratio resistor-ratio suffix resistor-ratio accuracy (% max) top mark max5490ga01000-t 1:1 01000 0.035 fzqg max5490gb01000-t 1:1 01000 0.05 fzqh max5490gc01000-t 1:1 01000 0.1 fzqi max5490ma02000-t 2:1 02000 0.035 fzrq max5490mb02000-t 2:1 02000 0.05 fzrr max5490mc02000-t 2:1 02000 0.1 fzrs max5490ta05000-t 5:1 05000 0.035 fzqj max5490tb05000-t 5:1 05000 0.05 fzqk max5490tc05000-t 5:1 05000 0.1 fzql max5490va10000-t 10:1 10000 0.035 fzqp max5490vb10000-t 10:1 10000 0.05 fzqq max5490vc10000-t 10:1 10000 0.1 fzqr max5490xa25000-t 25:1 25000 0.035 fzqv max5490xb25000-t 25:1 25000 0.05 fzqw MAX5490XC25000-t 25:1 25000 0.1 fzqx * standard ratios are available for ordering in any quantity. nonstandard ratios are also available for values between 1:1 to 100 :1. a minimum order quantity of 10,000 units is required for nonstandard ratios. please contact factory for more information. downloaded from: http:///
max5490 100k ? precision-matched resistor-divider 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. 8 _____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. 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 .) sot23 l.eps f 1 1 21-0051 package outline, 3l sot-23 downloaded from: http:///
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