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19-2647; rev 6; 8/12 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maximintegrated.com. max6126 ultra-high-precision, ultra-low-noise, series voltage reference general description the max6126 is an ultra-low-noise, high-precision, low- dropout voltage reference. this family of voltage refer- ences feature curvature-correction circuitry and high-stability, laser-trimmed, thin-film resistors that result in 3ppm/? (max) temperature coefficients and an excellent ?.02% (max) initial accuracy. the propri- etary low-noise reference architecture produces a low flicker noise of 1.3? p-p and wideband noise as low as 60nv/ hz (2.048v output) without the increased supply current usually found in low-noise references. improve wideband noise to 35nv/ hz and ac power-supply rejection by adding a 0.1? capacitor at the noise reduction pin. the max6126 series mode reference operates from a wide 2.7v to 12.6v supply voltage range and load-regulation specifications are guaran- teed to be less than 0.025 ? for sink and source cur- rents up to 10ma. these devices are available over the automotive temperature range of -40? to +125?. the max6126 typically draws 380? of supply current and is available in 2.048v, 2.500v, 2.800v, 3.000v, 4.096v, and 5.000v output voltages. these devices also feature dropout voltages as low as 200mv. unlike conventional shunt-mode (two-terminal) references that waste supply current and require an external resistor, the max6126 offers supply current that is virtually inde- pendent of supply voltage and does not require an external resistor. the max6126 is stable with 0.1? to 10? of load capacitance. the max6126 is available in the tiny 8-pin ?ax , as well as 8-pin so packages. applications high-resolution a/d and d/a converters ate equipment high-accuracy reference standard precision current sources digital voltmeters high-accuracy industrial and process control features ultra-low 1.3 v p-p noise (0.1hz to 10hz, 2.048v output) ultra-low 3ppm/? (max) temperature coefficient ?.02% (max) initial accuracy wide (v out + 200mv) to 12.6v supply voltage range low 200mv (max) dropout voltage 380 a quiescent supply current 10ma sink/source-current capability stable with c load = 0.1 f to 10 f low 20ppm/1000hr long-term stability 0.025 ? (max) load regulation 20 v/v (max) line regulation force and sense outputs for remote sensing outs i.c.* gnds 1 2 8 + 7 i.c.* outf in gnd nr so/ max top view 3 4 6 5 max6126 *i.c. = internally connected. do not use. pin configuration ordering information part temp range pin- package output voltage (v) maximum initial accuracy (%) maximum tempco (-40c to +85c) (ppm/c) max6126aasa21+ -40 c to +125 c 8 so 2.048 0.02 3 max6126basa21+ -40 c to +125 c 8 so 2.048 0.06 5 max6126a21+ -40 c to +125 c 8 ?ax 2.048 0.06 3 ordering information continued at end of data sheet. ?ax is a registered trademark of maxim integrated products, inc. + denotes a lead(pb)-free/rohs-compliant package.
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 2 maxim integrated 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. (all voltages referenced to gnd) gnds ....................................................................-0.3v to +0.3v in ........................................................................... -0.3v to +13v outf, outs, nr........ -0.3v to the lesser of (v in + 0.3v) or +6v output short circuit to gnd or in ..........................................60s continuous power dissipation (t a = +70?) 8-pin ?ax (derate 4.5mw/? above +70?) ............362mw 8-pin so (derate 5.88mw/? above +70?) ...............471mw operating temperature range ........................-40? to +125? junction temperature .....................................................+150? storage temperature range ............................-65? to +150? lead temperature (soldering, 10s) ................................+300? soldering temperature (reflow) ......................................+260? electrical characteristics?ax6126_21 (v out = 2.048v) (v in = 5v, c load = 0.1?, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) parameter symbol conditions min typ max units output output voltage v out t a = +25 c 2.048 v a grade so -0.02 +0.02 b grade so -0.06 +0.06 a grade ?ax -0.06 +0.06 output voltage accuracy referred to v out , t a = +25 c b grade ?ax -0.1 +0.1 % a grade so 0.5 3 b grade so 1 5 a grade ?ax 1 3 t a = -40 c to +85 c b grade ?ax 2 7 a grade so 1 5 b grade so 2 10 a grade ?ax 2 5 output voltage temperature coefficient (note 1) tcv out t a = -40 c to +125 c b grade ?ax 3 12 ppm/ c t a = +25 c220 line regulation ? v out / ? v in 2.7v v in 12.6v t a = -40 c to +125 c40 ?/v sourcing: 0 i out 10ma 0.7 25 load regulation ? v out / ? i out sinking: -10ma i out 0 1.3 25 ?/ma short to gnd 160 out short-circuit current i sc short to in 20 ma so 25 thermal hysteresis (note 2) ? v out / cycle ?ax 80 ppm so 20 long-term stability ? v out / time 1000hr at t a = +25 c ?ax 100 ppm/ 1000hr
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 3 maxim integrated electrical characteristics?ax6126_21 (v out = 2.048v) (continued) (v in = 5v, c load = 0.1?, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) parameter symbol conditions min typ max units dynamic characteristics f = 0.1hz to 10hz 1.3 ? p-p f = 1khz, c nr = 0 60 noise voltage e out f = 1khz, c nr = 0.1? 35 nv/ hz c nr = 0 0.8 turn-on settling time t r to v out = 0.01% of final value c nr = 0.1? 20 ms capacitive-load stability range c load no sustained oscillations 0.1 to 10 ? input supply voltage range v in guaranteed by line-regulation test 2.7 12.6 v t a = +25 c 380 550 quiescent supply current i in t a = -40 c to +125 c 725 ? electrical characteristics?ax6126_25 (v out = 2.500v) (v in = 5v, c load = 0.1?, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) parameter symbol conditions min typ max units output output voltage v out t a = +25 c 2.500 v a grade so -0.02 +0.02 b grade so -0.06 +0.06 a grade ?ax -0.06 +0.06 output voltage accuracy referred to v out , t a = +25 c b grade ?ax -0.1 +0.1 % a grade so 0.5 3 b grade so 1 5 a grade ?ax 1 3 t a = -40 c to +85 c b grade ?ax 2 7 a grade so 1 5 b grade so 2 10 a grade ?ax 2 5 output voltage temperature coefficient (note 1) tcv out t a = -40 c to +125 c b grade ?ax 3 12 ppm/ c t a = +25 c320 line regulation ? v out / ? v in 2.7v v in 12.6v t a = -40 c to +125 c40 ?/v sourcing: 0 i out 10ma 1 25 load regulation ? v out / ? i out sinking: -10ma i out 0 1.8 25 ?/ma
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 4 maxim integrated parameter symbol conditions min typ max units i out = 5ma 0.06 0.2 dropout voltage (note 3) v in - v out ? v out = 0.1% i out = 10ma 0.12 0.4 v short to gnd 160 out short-circuit current i sc short to in 20 ma so 35 thermal hysteresis (note 2) ? v out / cycle ?ax 80 ppm so 20 long-term stability ? v out / time 1000hr at t a = +25 c ?ax 100 ppm/ 1000hr dynamic characteristics f = 0.1hz to 10hz 1.45 ? p-p f = 1khz, c nr = 0 75 noise voltage e out f = 1khz, c nr = 0.1? 45 nv/ hz c nr = 0 1 turn-on settling time t r to v out = 0.01% of final value c nr = 0.1? 20 ms capacitive-load stability range c load no sustained oscillations 0.1 to 10 ? input supply voltage range v in guaranteed by line-regulation test 2.7 12.6 v t a = +25 c 380 550 quiescent supply current i in t a = -40 c to +125 c 725 ? electrical characteristics?ax6126_25 (v out = 2.500v) (continued) (v in = 5v, c load = 0.1?, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) parameter symbol condtions min typ max units output output voltage v out t a = +25? 2.800 v a grade ?ax -0.06 +0.06 output voltage accuracy referred to vout, t a = +25? b grade ?ax -0.10 +0.10 % a grade ?ax 1 3 t a = -40? to +85? b grade ?ax 2 7 a grade ?ax 2 5 output voltage temperature coefficient (note 1) tcv out t a = -40? to +125? b grade ?ax 3 12 ppm/? t a = +25? 3.5 23 line regulation ? v out / ? v in 3.0v v in 12.6v t a = -40? to +125? 45 ?/v sourcing: 0 i out 10ma 1.3 28 load regulation ? v out / ? v in sinking: -10ma i out 0 2.4 28 ?/ma i out = 5ma 0.06 0.2 dropout voltage (note 3) v in - v out ? v out = 0.1% i out = 10ma 0.12 0.4 v electrical characteristics?ax6126_28 (v out = 2.800v) (v in = 5v, c load = 0.1?, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.)
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 5 maxim integrated parameter symbol condtions min typ max units short to gnd 160 out short-circuit current i sc short to in 20 ma thermal hysteresis (note 2) ? v out /cycle ?ax 80 ppm long-term stability ? v out /time 1000hr at t a = +25? ?ax 100 ppm/ 1000hr dynamic characteristics f = 0.1hz to 10hz 1.45 ? p-p f = 1khz, c nr = 0 75 noise voltage e out f = 1khz, c nr = 0.1? 45 nv/ hz c nr = 0 1 turn-on settling time t r to v out = 0.01% of final value c nr = 0.1? 20 ms capacitive-load stability range c load no sustained oscillations 0.1 to 10 ? input supply voltage range v in guaranteed by line-regulation test 3.0 12.6 v t a = +25? 380 550 quiescent supply current i in t a = -40? to +125? 725 ? electrical characteristics?ax6126_28 (v out = 2.800v) (continued) (v in = 5v, c load = 0.1?, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) parameter symbol conditions min typ max units output output voltage v out t a = +25 c 3.000 v a grade so -0.02 +0.02 b grade so -0.06 +0.06 a grade ?ax -0.06 +0.06 output voltage accuracy referred to v out , t a = +25 c b grade ?ax -0.1 +0.1 % a grade so 0.5 3 b grade so 1 5 a grade ?ax 1 3 t a = -40 c to +85 c b grade ?ax 2 7 a grade so 1 5 b grade so 2 10 a grade ?ax 2 5 output voltage temperature coefficient (note 1) tcv out t a = -40 c to +125 c b grade ?ax 3 12 ppm/ c electrical characteristics?ax6126_30 (v out = 3.000v) (v in = 5v, c load = 0.1?, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.)
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 6 maxim integrated electrical characteristics?ax6126_30 (v out = 3.000v) (continued) (v in = 5v, c load = 0.1?, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) parameter symbol conditions min typ max units t a = +25 c425 line regulation ? v out / ? v in 3.2v v in 12.6v t a = -40 c to +125 c50 ?/v sourcing: 0 i out 10ma 1.5 30 load regulation ? v out / ? i out sinking: -10ma i out 0 2.8 30 ?/ma i out = 5ma 0.06 0.2 dropout voltage (note 3) v in - v out ? v out = 0.1% i out = 10ma 0.11 0.4 v short to gnd 160 out short-circuit current i sc short to in 20 ma so 20 thermal hysteresis (note 2) ? v out / cycle ?ax 80 ppm so 20 long-term stability ? v out / time 1000hr at t a = +25 c ?ax 100 ppm/ 1000hr dynamic characteristics f = 0.1hz to 10hz 1.75 ? p-p f = 1khz, c nr = 0 90 noise voltage e out f = 1khz, c nr = 0.1? 55 nv/ hz capacitive-load stability range c load no sustained oscillations 0.1 to 10 ? c nr = 0 1.2 turn-on settling time t r to v out = 0.01% of final value c nr = 0.1? 20 ms input supply voltage range v in guaranteed by line-regulation test 3.2 12.6 v t a = +25 c 380 550 quiescent supply current i in t a = -40 c to +125 c 725 ? electrical characteristics?ax6126_41 (v out = 4.096v) (v in = 5v, c load = 0.1?, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) parameter symbol conditions min typ max units output output voltage v out t a = +25 c 4.096 v a grade so -0.02 +0.02 b grade so -0.06 +0.06 a grade ?ax -0.06 +0.06 output voltage accuracy referred to v out , t a = +25 c b grade ?ax -0.1 +0.1 %
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 7 maxim integrated electrical characteristics?ax6126_41 (v out = 4.096v) (continued) (v in = 5v, c load = 0.1?, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) parameter symbol conditions min typ max units a grade so 0.5 3 b grade so 1 5 a grade ?ax 1 3 t a = -40 c to +85 c b grade ?ax 2 7 a grade so 1 5 b grade so 2 10 a grade ?ax 2 5 output voltage temperature coefficient (note 1) tcv out t a = -40 c to +125 c b grade ?ax 3 12 ppm/ c t a = +25 c 4.5 30 line regulation ? v out / ? v in 4.3v v in 12.6v t a = -40 c to +125 c60 ?/v sourcing: 0 i out 10ma 2 40 load regulation ? v out / ? i out sinking: -10ma i out 0 5 40 ?/ma i out = 5ma 0.05 0.2 dropout voltage (note 3) v in - v out ? v out = 0.1% i out = 10ma 0.1 0.4 v short to gnd 160 out short-circuit current i sc short to in 20 ma so 20 thermal hysteresis (note 2) ? v out / cycle ?ax 80 ppm so 20 long-term stability ? v out / time 1000hr at t a = + 25 c ?ax 100 ppm/ 1000hr dynamic characteristics f = 0.1hz to 10hz 2.4 ? p-p f = 1khz, c nr = 0 120 noise voltage e out f = 1khz, c nr = 0.1? 80 nv/ hz capacitive-load stability range c load no sustained oscillations 0.1 to 10 ? c nr = 0 1.6 turn-on settling time t r to v out = 0.01% of final value c nr = 0.1? 20 ms input supply voltage range v in guaranteed by line-regulation test 4.3 12.6 v t a = +25 c 380 550 quiescent supply current i in t a = -40 c to +125 c 725 ?
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 8 maxim integrated electrical characteristics?ax6126_50 (v out = 5.000v) (v in = 5.5v, c load = 0.1?, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) parameter symbol conditions min typ max units output output voltage v out t a = +25 c 5.000 v a grade so -0.02 +0.02 b grade so -0.06 +0.06 a grade ?ax -0.06 +0.06 output voltage accuracy t a = +25 c b grade ?ax -0.1 +0.1 % a grade so 0.5 3 b grade so 1 5 a grade ?ax 1 3 t a = -40 c to +85 c b grade ?ax 2 7 a grade so 1 5 b grade so 2 10 a grade ?ax 2 5 output voltage temperature coefficient (note 1) tcv out t a = -40 c to +125 c b grade ?ax 3 12 ppm/ c t a = +25 c340 line regulation ? v out / ? v in 5.2v v in 12.6v t a = -40 c to +125 c80 ?/v sourcing: 0 i out 10ma 2.5 50 load regulation ? v out / ? i out sinking: -10ma i out 0 6.5 50 ?/ma i out = 5ma 0.05 0.2 dropout voltage (note 3) v in - v out ? v out = 0.1% i out = 10ma 0.1 0.4 v short to gnd 160 out short-circuit current i sc short to in 20 ma so 15 thermal hysteresis (note 2) ? v out / cycle ?ax 80 ppm so 20 long-term stability ? v out / time 1000hr at t a = +25 c ?ax 100 ppm/ 1000hr dynamic characteristics f = 0.1hz to 10hz 2.85 ? p-p f = 1khz, c nr = 0 145 noise voltage e out f = 1khz, c nr = 0.1? 95 nv/ hz capacitive-load stability range c load no sustained oscillations 0.1 to 10 ?
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 9 maxim integrated electrical characteristics?ax6126_50 (v out = 5.000v) (continued) (v in = 5.5v, c load = 0.1?, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) parameter symbol conditions min typ max units c nr = 0 2 turn-on settling time t r to v out = 0.01% of final value c nr = 0.1? 20 ms input supply voltage range v in guaranteed by line-regulation test 5.2 12.6 v t a = +25 c 380 550 quiescent supply current i in t a = -40 c to +125 c 725 ? note 1: temperature coefficient is measured by the ?ox?method, i.e., the maximum ? v out / v out is divided by the maximum ? t. note 2: thermal hysteresis is defined as the change in +25? output voltage before and after cycling the device from t max to t min . note 3: dropout voltage is defined as the minimum differential voltage (v in - v out ) at which v out decreases by 0.1% from its original value at v in = 5.0v (v in = 5.5v for v out = 5.0v). typical operating characteristics (v in = 5v for max6126_21/25/30/41, v in = 5.5v for max6126_50, c load = 0.1?, i out = 0, t a = +25?, unless otherwise specified.) (note 5) max6126a_21 output voltage temperature drift (v out = 2.048v) (so) max6126 toc01 temperature ( c) output voltage (v) 100 75 50 25 0 -25 2.0465 2.0470 2.0475 2.0480 2.0485 2.0490 2.0460 -50 125 three typical parts max6126a_21 output voltage temperature drift (v out = 2.048v) ( max) max6126 toc02 temperature ( c) output voltage (v) 100 75 50 25 0 -25 2.0480 2.0475 2.0485 2.0490 2.0470 -50 125 three typical parts max6126a_50 output voltage temperature drift (v out = 5.000v) (so) max6126 toc03 temperature ( c) output voltage (v) 100 75 50 25 0 -25 5.000 4.999 5.001 5.002 4.998 -50 125 three typical parts
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 10 maxim integrated typical operating characteristics (continued) (v in = 5v for max6126_21/25/30/41, v in = 5.5v for max6126_50, c load = 0.1?, i out = 0, t a = +25?, unless otherwise specified.) (note 5) max6126a_50 output voltage temperature drift (v out = 5.000v) ( max) max6126 toc04 temperature ( c) output voltage (v) 100 75 50 25 0 -25 5.000 4.999 5.001 5.002 4.998 -50 125 three typical parts max6126_21 load regulation max6126 toc05 output current (ma) output voltage (v) 5 0 -5 2.0465 2.0470 2.0475 2.0480 2.0485 2.0460 -10 10 t a = +25 c t a = -40 c t a = +125 c max6126_50 load regulation max6126 toc06 output current (ma) output voltage (v) 5 0 -5 4.997 4.998 4.999 5.000 5.001 4.996 -10 10 t a = +25 c t a = -40 c t a = +125 c max6126_50 power-supply rejection ratio vs. frequency max6126 toc10 frequency (khz) psrr (db) 100 10 1 0.1 0.01 -100 -80 -60 -40 -20 0 -120 0.001 1000 max6126_21 supply current vs. input voltage max6126 toc11 input voltage (v) supply current ( a) 12 10 8 6 4 2 100 200 300 400 500 600 0 014 t a = +25 c t a = -40 c t a = +125 c max6126_50 supply current vs. input voltage max6126 toc12 input voltage (v) supply current ( a) 12 10 6 8 4 2 100 200 300 400 500 600 700 800 900 0 014 t a = +25 c t a = -40 c t a = +125 c max6126_25 dropout voltage vs. source current max6126 toc07 source current (ma) dropout voltage (mv) 12 9 6 3 50 100 150 200 250 300 0 015 t a = +25 c t a = -40 c t a = +125 c max6126_50 dropout voltage vs. source current max6126 toc08 source current (ma) dropout voltage (mv) 12 9 6 3 50 100 150 200 250 0 015 t a = +25 c t a = -40 c t a = +125 c max6126_21 power-supply rejection ratio vs. frequency max6126 toc09 frequency (khz) psrr (db) 100 10 1 0.1 0.01 -100 -80 -60 -40 -20 0 -120 0.001 1000
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 11 maxim integrated typical operating characteristics (continued) (v in = 5v for max6126_21/25/30/41, v in = 5.5v for max6126_50, c load = 0.1?, i out = 0, t a = +25?, unless otherwise specified.) (note 5) max6126_21 output noise (0.1hz to 10hz) max6126 toc13 1s/div 0.4 v/div v out = 2.048v max6126_50 output noise (0.1hz to 10hz) max6126 toc14 1s/div 1 v/div v out = 5v max6126_21 load transient max6126 toc15 200 s/div 0ma 10ma v out ac-coupled 100mv/div c load = 0.1 f v in = 5v i out 5ma/div i out = 0 to 10ma v out = 2.048v max6126_21 load transient max6126 toc16 200 s/div c load = 0.1 f v in = 5v i out = -100 a to 1ma v out = 2.048v -100 a 1ma v out ac-coupled 20mv/div i out 500 a/div max6126_21 load transient max6126 toc17 400 s/div c load = 0.1 f v in = 5v i out = -1ma to -10ma v out = 2.048v -10ma -1ma v out ac-coupled 100mv/div i out 5ma/div max6126_21 load transient max6126 toc18 1ms/div c load = 10 f v in = 5v i out = 0 to 10ma v out = 2.048v 0ma 10ma v out ac-coupled 20mv/div i out 5ma/div
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 12 maxim integrated typical operating characteristics (continued) (v in = 5v for max6126_21/25/30/41, v in = 5.5v for max6126_50, c load = 0.1?, i out = 0, t a = +25?, unless otherwise specified.) (note 5) max6126_21 load transient max6126 toc19 1ms/div c load = 10 f v in = 5v i out = -100 a to 1ma v out = 2.048v -100 a +1ma v out ac-coupled 10mv/div i out 500 a/div max6126_21 load transient max6126 toc20 400 s/div c load = 10 f v in = 5v i out = -1ma to -10ma v out = 2.048v -10ma -1ma v out ac-coupled 50mv/div i out 5ma/div max6126_21 line transient max6126 toc21 2.7v 3.2v v out ac-coupled 20mv/div v in 200mv/div 20 s/div v out = 2.048v c load = 0.1 f max6126_50 line transient max6126 toc22 5.2v 5.7v v out ac-coupled 10mv/div v in 200mv/div 400 s/div v in = 5.2v to 5.7v v out = 5v c load = 0.1 f max6126_21 turn-on transient max6126 toc23 20 s/div gnd 5.5v v out 1v/div v in 2v/div c load = 0.1 f v out = 2.048v max6126_50 turn-on transient max6126 toc24 gnd 5.5v v out 2v/div v in 2v/div gnd 200 s/div c load = 0.1 f v out = 5v
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 13 maxim integrated typical operating characteristics (continued) (v in = 5v for max6126_21/25/30/41, v in = 5.5v for max6126_50, c load = 0.1?, i out = 0, t a = +25?, unless otherwise specified.) (note 5) max6126_21 turn-on transient max6126 toc25 gnd 5.5v v out 1v/div v in 2v/div 40 s/div c load = 10 f v out = 2.048v max6126_50 turn-on transient max6126 toc26 gnd 5.5v v out 2v/div v in 2v/div gnd 400 s/div c load = 10 f v out = 5v 2.4994 2.4998 2.4996 2.5002 2.5000 2.5004 2.5006 0400 200 600 800 1000 max6126b_25 long-term stability vs. time (so) max6126 toc27 time (hr) v out (v) two typical parts v out = 2.5v 2.5010 2.5005 2.5000 2.4995 2.4990 0 400 200 600 800 1000 max6126b_25 long-term stability vs. time ( max) max6126 toc28 time (hr) v out (v) two typical parts v out = 2.5v 4.9994 4.9998 4.9996 5.0002 5.0000 5.0004 5.0006 0400 200 600 800 1000 max6126b_50 long-term stability vs. time (so) max6126 toc29 time (hr) v out (v) two typical parts v out = 5v 5.0010 5.0005 5.0000 4.9995 4.9990 0400 200 600 800 1000 max6126b_50 long-term stability vs. time ( max) max6126 toc30 time (hr) v out (v) two typical parts v out = 5v note 5: many of the max6126 typical operating characteristics are extremely similar. the extremes of these characteristics are found in the max6126_21 (2.048v output) and the max6126_50 (5.000v output). the typical operating characteristics of the remainder of the max6126 family typically lie between those two extremes and can be estimated based on their output voltages.
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 14 maxim integrated detailed description wideband noise reduction to improve wideband noise and transient power-supply noise, add a 0.1? capacitor to nr (figure 1). larger values do not improve noise appreciably. a 0.1? nr capacitor reduces the noise from 60nv/ hz to 35nv/ hz for the 2.048v output. noise in the power- supply input can affect output noise, but can be reduced by adding an optional bypass capacitor between in and gnd, as shown in the typical operating circuit . output bypassing the max6126 requires an output capacitor between 0.1? and 10?. locate the output capacitor as close to outf as possible. for applications driving switching capacitive loads or rapidly changing load currents, it is advantageous to use a 10? capacitor in parallel with a 0.1? capacitor. larger capacitor values reduce tran- sients on the reference output. supply current the quiescent supply current of the series-mode max6126 family is typically 380? and is virtually inde- pendent of the supply voltage, with only a 2?/v (max) variation with supply voltage. when the supply voltage is below the minimum speci- fied input voltage during turn-on, the device can draw up to 300? beyond the nominal supply current. the input voltage source must be capable of providing this current to ensure reliable turn-on. thermal hysteresis thermal hysteresis is the change of output voltage at t a = +25? before and after the device is cycled over its entire operating temperature range. the typical ther- mal hysteresis value is 20ppm (so package). turn-on time these devices typically turn on and settle to within 0.1% of their final value in 200? to 2ms depending on the device. the turn-on time can increase up to 4ms with the device operating at the minimum dropout volt- age and the maximum load. a noise reduction capaci- tor of 0.1? increases the turn-on time to 20ms. output force and sense the max6126 provides independent connections for the power-circuit output (outf) supplying current into a load, and for the circuit input regulating the voltage applied to that load (outs). this configuration allows for the cancellation of the voltage drop on the lines connect- ing the max6126 and the load. when using the kelvin connection made possible by the independent current and voltage connections, take the power connection to the load from outf, and bring a line from outs to join the line from outf, at the point where the voltage accu- pin description pin name function 1nr noise reduction. connect a 0.1? capacitor to improve wideband noise. leave unconnected if not used (see figure 1). 2 in positive power-supply input 3 gnd ground 4 gnds ground-sense connection. connect to ground connection at load. 5, 8 i.c. internally connected. do not connect anything to these pins. 6 outs voltage reference sense output 7 outf voltage reference force output. short outf to outs as close to the load as possible. bypass outf with a capacitor (0.1? to 10?) to gnd. nr outf *optional. 0.1 f* outs reference output (v out + 200mv) to 12.6v input in gnd gnds max6126 * figure 1. noise-reduction capacitor
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 15 maxim integrated racy is needed. the max6126 has the same type of kelvin connection to cancel drops in the ground return line. connect the load to ground and bring a connection from gnds to exactly the same point. applications information precision current source figure 2 shows a typical circuit providing a precision current source. the outf output provides the bias cur- rent for the bipolar transistor. outs and gnds sense the voltage across the resistor and adjust the current sourced by outf accordingly. for even higher preci- sion, use a mosfet to eliminate base current errors. high-resolution dac and reference from a single supply figure 3 shows a typical circuit providing the reference for a high-resolution, 16-bit max541 d/a converter. temperature coefficient vs. operating temperature range for a 1 lsb maximum error in a data converter application, the reference voltage of the converter must stay within a certain limit to keep the error in the data converter smaller than the resolution limit through the operating temperature range. figure 4 shows the maximum allowable reference voltage tem- perature coefficient to keep the conversion error to less than 1 lsb, as a function of the operating temperature range (t max - t min ) with the converter resolution as a parameter. the graph assumes the reference voltage temperature coefficient as the only parameter affecting accuracy. in reality, the absolute static accuracy of a data con- verter is dependent on the combination of many para- meters such as integral nonlinearity, differential nonlinearity, offset error, gain error, as well as voltage reference changes. outf i source r outs v out(nominal) / r = i source in gnd gnds max6126 figure 2. precision current source outf outs in gnd gnds max6126 out ref analog output v dd 3v supply gnd max541 dac figure 3. 14-bit high-resolution dac and positive reference from a single 3v supply
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 16 maxim integrated temperature coefficient (ppm/ c) 110 100 16 bit 14 bit 12 bit 10 bit 8 bit 0.01 0.1 10 100 1000 1 10,000 18 bit 20 bit operating temperature range (t max - t min ) ( c) figure 4. temperature coefficient vs. operating temperature range for a 1 lsb maximum error chip information process: bicmos nr outf *optional. * outs reference output (v out + 200mv) to 12.6v input in gnd gnds * max6126 load typical operating circuit
max6126 ultra-high-precision, ultra-low-noise, series voltage reference 17 maxim integrated ordering information (continued) part temp range pin- package output voltage (v) maximum initial accuracy (%) maximum tempco (-40c to +85c) (ppm/c) max6126b21+ -40 c to +125 c 8 ?ax 2.048 0.1 7 max6126aasa25+ -40 c to +125 c 8 so 2.500 0.02 3 max6126basa25+ -40 c to +125 c 8 so 2.500 0.06 5 max6126a25+ -40 c to +125 c 8 ?ax 2.500 0.06 3 max6126b25+ -40 c to +125 c 8 ?ax 2.500 0.1 7 max6126a28+ -40 c to +125 c 8 ?ax 2.800 0.06 3 max6126b28+ -40 c to +125 c 8 ?ax 2.800 0.1 7 max6126aasa30+ -40 c to +125 c 8 so 3.000 0.02 3 max6126basa30+ -40 c to +125 c 8 so 3.000 0.06 5 max6126a30+ -40 c to +125 c 8 ?ax 3.000 0.06 3 max6126b30+ -40 c to +125 c 8 ?ax 3.000 0.1 7 max6126aasa41+ -40 c to +125 c 8 so 4.096 0.02 3 max6126basa41+ -40 c to +125 c 8 so 4.096 0.06 5 max6126basa41/v+ -40 c to +125 c 8 so 4.096 0.06 5 max6126a41+ -40 c to +125 c 8 ?ax 4.096 0.06 3 max6126b41+ -40 c to +125 c 8 ?ax 4.096 0.1 7 max6126aasa50+ -40 c to +125 c 8 so 5.000 0.02 3 max6126basa50+ -40 c to +125 c 8 so 5.000 0.06 5 max6126a50+ -40 c to +125 c 8 ?ax 5.000 0.06 3 max6126b50+ -40 c to +125 c 8 ?ax 5.000 0.1 7 package type package code outline no. land pattern no. 8 ?ax u8+1 21-0036 90-0092 8 so s8+4 21-0041 90-0096 + denotes a lead(pb)-free/rohs-compliant package. /v denotes an automotive qualified part. package information (continued) 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 per tains to the package regardless of rohs status.
maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integr ated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifications without notice 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. 18 ________________________________ maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 2012 maxim integrated products, inc. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products , inc. max6126 ultra-high-precision, ultra-low-noise, series voltage reference revision history revision number revision date description pages changed 0 10/02 initial release 1 3/03 remove ?uture product?and ?ontact factory?notes 1, 16 2 6/03 add ??grade devices 1, 16 3 12/03 change ?ax part number 1, 16 4 7/04 add top mark to ordering information 1, 16 5 12/10 add 2.8v option, add lead-free options, update package information 1, 2, 4, 15, 16 6 8/12 added automotive package, max6126basa41/v+ to data sheet 17

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