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general description the max6126 is an ultra-low-noise, high-precision, low- dropout voltage reference. this family of voltage references feature curvature-correction circuitry and high-stability, laser-trimmed, thin-film resistors that result in 3ppm/c (max) temperature coefficients and an excellent 0.02% (max) initial accuracy. the proprietary low-noise reference architecture produces a low flicker noise of 1.3v 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 0.1f 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 guaranteed to be less than 0.025 for sink and source currents up to 10ma. these devices are available over the automotive temperature range of -40c to +125c. the max6126 typically draws 380a of supply current and is available in 2.048v, 2.500v, 2.800v, 3.000v, 3.300v, 3.600v, 4.096v, and 5.000v output voltages. the max6126 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 independent of supply voltage and does not require an external resistor. the max6126 is stable with 0.1f to 10f of load capacitance. the max6126 is available in the tiny 8-pin max ? , 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 beneits and features ultra-low 1.3v p-p noise (0.1hz to 10hz, 2.048v output) ultra-low 3ppm/c (max) temperature coefficient 0.02% (max) initial accuracy wide (v out + 200mv) to 12.6v supply voltage range low 200mv (max) dropout voltage 380a quiescent supply current 10ma sink/source-current capability stable with c load = 0.1f to 10f low 20ppm/1000hr long-term stability 0.025 (max) load regulation 20v/v (max) line regulation force and sense outputs for remote sensing ordering information continued at end of data sheet. 19-2647; rev 8; 6/16 +denotes a lead(pb)-free/rohs-compliant package. max is a registered trademark of maxim integrated products, inc. part temp range pin- package output voltage (v) maximum initial accuracy (%) maximum tempco (-40c to +85c) (ppm/c) max6126aasa21+ -40c to +125c 8 so 2.048 0.02 3 max6126basa21+ -40c to +125c 8 so 2.048 0.06 5 max6126a21+ -40c to +125c 8 max 2.048 0.06 3 outs i.c.* gnds 12 8 7 i.c.* outf in gnd nr so/max top view 3 4 6 5 max6126 *i.c. = internally connected. do not use. max6126 ultra-high-precision, ultra-low-noise, series voltage reference pin coniguration ordering information downloaded from: http:///
(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 = +70c) 8-pin max (derate 4.5mw/c above +70c) ............ 362mw 8-pin so (derate 5.88mw/c above +70c) ............... 471mw 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 in = 5v, c load = 0.1f, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) parameter symbol conditions min typ max units output output voltage v out t a = +25c 2.048 v output voltage accuracy referred to v out , t a = +25c a grade so -0.02 +0.02 % b grade so -0.06 +0.06 a grade max -0.06 +0.06 b grade max -0.1 +0.1 output voltage temperature coeficient (note 1) tcv out t a = -40c to +85c a grade so 0.5 3 ppm/c b grade so 1 5 a grade max 1 3 b grade max 2 7 t a = -40c to +125c a grade so 1 5 b grade so 2 10 a grade max 2 5 b grade max 3 12 line regulation d v out / d v in 2.7v v in 12.6v t a = +25c 2 20 v/v t a = -40c to +125c 40 load regulation d v out / d i out sourcing: 0 i out 10ma 0.7 25 v/ma sinking: -10ma i out 0 1.3 25 out short-circuit current i sc short to gnd 160 ma short to in 20 thermal hysteresis (note 2) d v out / cycle so 25 ppm max 80 long-term stability d v out / time 1000hr at t a = +25c so 20 ppm/ 1000hr max 100 max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 2 absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the devi ce. 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 characteristicsmax6126_21 (v out = 2.048v) downloaded from: http:///
(v in = 5v, c load = 0.1f, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) (v in = 5v, c load = 0.1f, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) parameter symbol conditions min typ max units dynamic characteristics noise voltage e out f = 0.1hz to 10hz 1.3 v p-p f = 1khz, c nr = 0 60 nv/ hz f = 1khz, c nr = 0.1f 35 turn-on settling time t r to v out = 0.01% of inal value c nr = 0 0.8 ms c nr = 0.1f 20 capacitive-load stability range c load no sustained oscillations 0.1 to 10 f input supply voltage range v in guaranteed by line-regulation test 2.7 12.6 v quiescent supply current i in t a = +25c 380 550 a t a = -40c to +125c 725 parameter symbol conditions min typ max units output output voltage v out t a = +25c 2.500 v output voltage accuracy referred to v out , t a = +25c a grade so -0.02 +0.02 % b grade so -0.06 +0.06 a grade max -0.06 +0.06 b grade max -0.1 +0.1 output voltage temperature coeficient (note 1) tcv out t a = -40c to +85c a grade so 0.5 3 ppm/c b grade so 1 5 a grade max 1 3 b grade max 2 7 t a = -40c to +125c a grade so 1 5 b grade so 2 10 a grade max 2 5 b grade max 3 12 line regulation d v out / d v in 2.7v v in 12.6v t a = +25c 3 20 v/v t a = -40c to +125c 40 load regulation d v out / d i out sourcing: 0 i out 10ma 1 25 v/ma sinking: -10ma i out 0 1.8 25 max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 3 electrical characteristicsmax6126_25 (v out = 2.500v) electrical characteristicsmax6126_21 (v out = 2.048v) (continued) downloaded from: http:///
(v in = 5v, c load = 0.1f, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) (v in = 5v, c load = 0.1f, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) parameter symbol conditions min typ max units dropout voltage (note 3) v in - v out d v out = 0.1% i out = 5ma 0.06 0.2 v i out = 10ma 0.12 0.4 out short-circuit current i sc short to gnd 160 ma short to in 20 thermal hysteresis (note 2) d v out / cycle so 35 ppm max 80 long-term stability d v out / time 1000hr at t a = +25c so 20 ppm/ 1000hr max 100 dynamic characteristics noise voltage e out f = 0.1hz to 10hz 1.45 v p-p f = 1khz, c nr = 0 75 nv/ hz f = 1khz, c nr = 0.1f 45 turn-on settling time t r to v out = 0.01% of inal value c nr = 0 1 ms c nr = 0.1f 20 capacitive-load stability range c load no sustained oscillations 0.1 to 10 f input supply voltage range v in guaranteed by line-regulation test 2.7 12.6 v quiescent supply current i in t a = +25c 380 550 a t a = -40c to +125c 725 parameter symbol conditions min typ max units output output voltage v out t a = +25c 2.800 v output voltage accuracy referred to v out , t a = +25c a grade max -0.06 +0.06 % b grade max -0.10 +0.10 output voltage temperature coeficient (note 1) tcv out t a = -40c to +85c a grade max 1 3 ppm/c b grade max 2 7 t a = -40c to +125c a grade max 2 5 b grade max 3 12 line regulation d v out / d v in 3.0v v in 12.6v t a = +25c 3.5 23 v/v t a = -40c to +125c 45 load regulation d v out / d v in sourcing: 0 i out 10ma 1.3 28 v/ma sinking: -10ma i out 0 2.4 28 dropout voltage (note 3) v in - v out d v out = 0.1% i out = 5ma 0.06 0.2 v i out = 10ma 0.12 0.4 max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 4 electrical characteristicsmax6126_25 (v out = 2.500v) (continued) electrical characteristicsmax6126_28 (v out = 2.800v) downloaded from: http:///
(v in = 5v, c load = 0.1f, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) (v in = 5v, c load = 0.1f, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) parameter symbol conditions min typ max units out short-circuit current i sc short to gnd 160 ma short to in 20 thermal hysteresis (note 2) d v out / cycle max 80 ppm long-term stability d v out / time 1000hr at t a = +25c max 100 ppm/ 1000hr dynamic characteristics noise voltage e out f = 0.1hz to 10hz 1.45 v p-p f = 1khz, c nr = 0 75 nv/hz f = 1khz, c nr = 0.1f 45 turn-on settling time t r to v out = 0.01% of inal value c nr = 0 1 ms c nr = 0.1f 20 capacitive-load stability range c load no sustained oscillations 0.1 to 10 f input supply voltage range v in guaranteed by line-regulation test 3.0 12.6 v quiescent supply current i in t a = +25c 380 550 a t a = -40c to +125c 725 parameter symbol conditions min typ max units output output voltage v out t a = +25c 3.000 v output voltage accuracy referred to v out , t a = +25c a grade so -0.02 +0.02 % b grade so -0.06 +0.06 a grade max -0.06 +0.06 b grade max -0.1 +0.1 output voltage temperature coeficient (note 1) tcv out t a = -40c to +85c a grade so 0.5 3 ppm/c b grade so 1 5 a grade max 1 3 b grade max 2 7 t a = -40c to +125c a grade so 1 5 b grade so 2 10 a grade max 2 5 b grade max 3 12 max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 5 electrical characteristicsmax6126_30 (v out = 3.000v) electrical characteristicsmax6126_28 (v out = 2.800v) (continued) downloaded from: http:///
(v in = 5v, c load = 0.1f, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) parameter symbol conditions min typ max units line regulation d v out / d v in 3.2v v in 12.6v t a = +25c 4 25 v/v t a = -40c to +125c 50 load regulation d v out / d i out sourcing: 0 i out 10ma 1.5 30 v/ma sinking: -10ma i out 0 2.8 30 dropout voltage (note 3) v in - v out d v out = 0.1% i out = 5ma 0.06 0.2 v i out = 10ma 0.11 0.4 out short-circuit current i sc short to gnd 160 ma short to in 20 thermal hysteresis (note 2) d v out / cycle so 20 ppm max 80 long-term stability d v out / time 1000hr at t a = +25c so 20 ppm/ 1000hr max 100 dynamic characteristics noise voltage e out f = 0.1hz to 10hz 1.75 v p-p f = 1khz, c nr = 0 90 nv/ hz f = 1khz, c nr = 0.1f 55 capacitive-load stability range c load no sustained oscillations 0.1 to 10 f turn-on settling time t r to v out = 0.01% of inal value c nr = 0 1.2 ms c nr = 0.1f 20 input supply voltage range v in guaranteed by line-regulation test 3.2 12.6 v quiescent supply current i in t a = +25c 380 550 a t a = -40c to +125c 725 max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 6 electrical characteristicsmax6126_30 (v out = 3.000v) (continued) downloaded from: http:///
parameter symbol conditions min typ max units output output voltage v out t a = +25c 3.300 v output voltage accuracy referred to v out , t a = +25c a grade so -0.02 +0.02 % b grade so -0.06 +0.06 a grade max -0.06 +0.06 b grade max -0.1 +0.1 output voltage temperature coeficient (note 1) tcv out t a = -40c to +85c a grade so 0.5 3 ppm/c b grade so 1 5 a grade max 1 3 b grade max 2 7 t a = -40c to +125c a grade so 1 5 b grade so 2 10 a grade max 2 5 b grade max 3 12 line regulation v out / v in 3.5v v in 12.6v t a = +25c 11 35 v/v t a = -40c to +125c 70 load regulation v out / i out sourcing: 0 i out 10ma 2 40 v/ma sinking: -10ma i out 0 5 40 dropout voltage (note 3) v in - v out v out = 0.1% i out = 5ma 0.06 0.2 v i out = 10ma 0.12 0.4 out short-circuit current i sc short to gnd 160 ma short to in 20 thermal hysteresis (note 2) v out / cycle so 20 ppm max 80 long-term stability v out / time 1000hr at t a = +25c so 20 ppm/ 1000hr max 100 dynamic characteristics noise voltage e out f = 0.1hz to 10hz 1.95 v p-p f = 1khz, c nr = 0 100 nv/ hz f = 1khz, c nr = 0.1f 60 capacitive-load stability range c load no sustained oscillations 0.1 to 10 f turn-on settling time t r to v out = 0.01% of inal value c nr = 0 1.2 ms c nr = 0.1f 20 input supply voltage range v in guaranteed by line-regulation test 3.5 12.6 v quiescent supply current i in t a = +25c 380 550 a t a = -40c to +125c 725 (v in = 5v, c load = 0.1f, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 7 electrical characteristicsmax6126_33 (v out = 3.300v) downloaded from: http:///
parameter symbol conditions min typ max units output output voltage v out t a = +25c 3.6 v output voltage accuracy referred to v out , t a = +25c a grade so -0.02 +0.02 % b grade so -0.06 +0.06 a grade max -0.06 +0.06 b grade max -0.1 +0.1 output voltage temperature coeficient (note 1) tcv out t a = -40c to +85c a grade so 0.5 3 ppm/c b grade so 1 5 a grade max 1 3 b grade max 2 7 t a = -40c to +125c a grade so 1 5 b grade so 2 10 a grade max 2 5 b grade max 3 12 line regulation v out / v in 3.8v v in 12.6v t a = +25c 12 40 v/v t a = -40c to +125c 80 load regulation v out / i out sourcing: 0 i out 10ma 2 50 v/ma sinking: -10ma i out 0 6 50 dropout voltage (note 3) v in - v out v out = 0.1% i out = 5ma 0.05 0.2 v i out = 10ma 0.11 0.4 out short-circuit current i sc short to gnd 160 ma short to in 20 thermal hysteresis (note 2) v out / cycle so 20 ppm max 80 long-term stability v out / time 1000hr at t a = +25c so 20 ppm/ 1000hr max 100 dynamic characteristics noise voltage e out f = 0.1hz to 10hz 2.1 v p-p f = 1khz, c nr = 0 110 nv/ hz f = 1khz, c nr = 0.1f 66 capacitive-load stability range c load no sustained oscillations 0.1 to 10 f turn-on settling time t r to v out = 0.01% of inal value c nr = 0 1.6 ms c nr = 0.1f 20 input supply voltage range v in guaranteed by line-regulation test 3.8 12.6 v quiescent supply current i in t a = +25c 380 550 a t a = -40c to +125c 725 max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 8 (v in = 5v, c load = 0.1f, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) electrical characteristicsmax6126_36 (v out = 3.600v) downloaded from: http:///
(v in = 5v, c load = 0.1f, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) parameter symbol conditions min typ max units output output voltage v out t a = +25c 4.096 v output voltage accuracy referred to v out , t a = +25c a grade so -0.02 +0.02 % b grade so -0.06 +0.06 a grade max -0.06 +0.06 b grade max -0.1 +0.1 output voltage temperature coeficient (note 1) tcv out t a = -40c to +85c a grade so 0.5 3 ppm/c b grade so 1 5 a grade max 1 3 b grade max 2 7 t a = -40c to +125c a grade so 1 5 b grade so 2 10 a grade max 2 5 b grade max 3 12 line regulation d v out / d v in 4.3v v in 12.6v t a = +25c 4.5 30 v/v t a = -40c to +125c 60 load regulation d v out / d i out sourcing: 0 i out 10ma 2 40 v/ma sinking: -10ma i out 0 5 40 dropout voltage (note 3) v in - v out d v out = 0.1% i out = 5ma 0.05 0.2 v i out = 10ma 0.1 0.4 out short-circuit current i sc short to gnd 160 ma short to in 20 thermal hysteresis (note 2) d v out / cycle so 20 ppm max 80 long-term stability d v out / time 1000hr at t a = +25c so 20 ppm/ 1000hr max 100 dynamic characteristics noise voltage e out f = 0.1hz to 10hz 2.4 v p-p f = 1khz, c nr = 0 120 nv/ hz f = 1khz, c nr = 0.1f 80 capacitive-load stability range c load no sustained oscillations 0.1 to 10 f turn-on settling time t r to v out = 0.01% of inal value c nr = 0 1.6 ms c nr = 0.1f 20 input supply voltage range v in guaranteed by line-regulation test 4.3 12.6 v quiescent supply current i in t a = +25c 380 550 a t a = -40c to +125c 725 max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 9 electrical characteristicsmax6126_41 (v out = 4.096v) downloaded from: http:///
(v in = 5.5v, c load = 0.1f, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) parameter symbol conditions min typ max units output output voltage v out t a = +25c 5.000 v output voltage accuracy t a = +25c a grade so -0.02 +0.02 % b grade so -0.06 +0.06 a grade max -0.06 +0.06 b grade max -0.1 +0.1 output voltage temperature coeficient (note 1) tcv out t a = -40c to +85c a grade so 0.5 3 ppm/c b grade so 1 5 a grade max 1 3 b grade max 2 7 t a = -40c to +125c a grade so 1 5 b grade so 2 10 a grade max 2 5 b grade max 3 12 line regulation d v out / d v in 5.2v v in 12.6v t a = +25c 3 40 v/v t a = -40c to +125c 80 load regulation d v out / d i out sourcing: 0 i out 10ma 2.5 50 v/ma sinking: -10ma i out 0 6.5 50 dropout voltage (note 3) v in - v out d v out = 0.1% i out = 5ma 0.05 0.2 v i out = 10ma 0.1 0.4 out short-circuit current i sc short to gnd 160 ma short to in 20 thermal hysteresis (note 2) d v out / cycle so 15 ppm max 80 long-term stability d v out / time 1000hr at t a = +25c so 20 ppm/ 1000hr max 100 dynamic characteristics noise voltage e out f = 0.1hz to 10hz 2.85 v p-p f = 1khz, c nr = 0 145 nv/ hz f = 1khz, c nr = 0.1f 95 capacitive-load stability range c load no sustained oscillations 0.1 to 10 f max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 10 electrical characteristicsmax6126_50 (v out = 5.000v) downloaded from: http:///
(v in = 5.5v, c load = 0.1f, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) (v in = 5v for max6126_21/25/30/33/36/41, v in = 5.5v for max6126_50, c load = 0.1f, i out = 0, t a = +25c, unless otherwise speciied.) (note 5) note 1: temperature coefficient is measured by the box 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 +25c 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). parameter symbol conditions min typ max units turn-on settling time t r to v out = 0.01% of inal value c nr = 0 2 ms c nr = 0.1f 20 input supply voltage range v in guaranteed by line-regulation test 5.2 12.6 v quiescent supply current i in t a = +25c 380 550 a t a = -40c to +125c 725 max6126a_21 output voltage temperature drift (v out = 2.048v) (max) max6126 toc02 temperature (c) output voltage (v) 100 75 50 25 0 -25 2.04802.0475 2.0485 2.04902.0470 -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 5.0004.999 5.001 5.0024.998 -50 125 three typical parts 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 2.04902.0460 -50 125 three typical parts max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 11 electrical characteristicsmax6126_50 (v out = 5.000v) (continued) typical operating characteristics downloaded from: http:///
(v in = 5v for max6126_21/25/30/33/36/41, v in = 5.5v for max6126_50, c load = 0.1f, i out = 0, t a = +25c, unless otherwise speciied.) (note 5) 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 0 15 t a = +25c t a = -40c t a = +125c max6126a_50 output voltage temperature drift (v out = 5.000v) (max) max6126 toc04 temperature (c) output voltage (v) 100 75 50 25 0 -25 5.0004.999 5.001 5.0024.998 -50 125 three typical parts 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 0 15 t a = +25c t a = -40c t a = +125c max6126_21 load regulation max6126 toc05 output current (ma) output voltage (v) 5 0 -5 2.0465 2.0470 2.0475 2.0480 2.04852.0460 -10 10 t a = +25c t a = -40c t a = +125c 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_50 load regulation max6126 toc06 output current (ma) output voltage (v) 5 0 -5 4.997 4.998 4.999 5.000 5.0014.996 -10 10 t a = +25c t a = -40c t a = +125c 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 0 14 t a = +25c t a = -40c t a = +125c 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 0 14 t a = +25c t a = -40c t a = +125c maxim integrated 12 www.maximintegrated.com max6126 ultra-high-precision, ultra-low-noise, series voltage reference typical operating characteristics (continued) downloaded from: http:///
(v in = 5v for max6126_21/25/30/33/36/41, v in = 5.5v for max6126_50, c load = 0.1f, i out = 0, t a = +25c, unless otherwise speciied.) (note 5) max6126_21 output noise (0.1hz to 10hz) max6126 toc13 1s/div 0.4v/div v out = 2.048v max6126_50 output noise (0.1hz to 10hz) max6126 toc14 1s/div 1v/div v out = 5v toc15 6.5s/div output noise (0.1hzC10hz) cnr = 100f 0.6v p-p max6126_21 load transient max6126 toc16 200s/div c load = 0.1f v in = 5v i out = -100a to 1ma v out = 2.048v -100a 1mav out ac-coupled20mv/div i out 500a/div max6126_21 load transient max6126 toc17 400s/div c load = 0.1f v in = 5v i out = -1ma to -10ma v out = 2.048v -10ma -1mav out ac-coupled100mv/div i out 5ma/div max6126_21 load transient max6126 toc18 1ms/div c load = 10f v in = 5v i out = 0 to 10ma v out = 2.048v 0ma 10mav out ac-coupled20mv/div i out 5ma/div maxim integrated 13 www.maximintegrated.com max6126 ultra-high-precision, ultra-low-noise, series voltage reference typical operating characteristics (continued) downloaded from: http:///
(v in = 5v for max6126_21/25/30/33/36/41, v in = 5.5v for max6126_50, c load = 0.1f, i out = 0, t a = +25c, unless otherwise speciied.) (note 5) max6126_21 load transient max6126 toc19 1ms/div c load = 10f v in = 5v i out = -100a to 1ma v out = 2.048v -100a +1mav out ac-coupled10mv/div i out 500a/div max6126_21 load transient max6126 toc20 400s/div c load = 10f v in = 5v i out = -1ma to -10ma v out = 2.048v -10ma -1mav out ac-coupled50mv/div i out 5ma/div max6126_21 line transient max6126 toc21 2.7v 3.2vv out ac-coupled20mv/div v in 200mv/div 20s/div v out = 2.048v c load = 0.1f max6126_50 line transient max6126 toc22 5.2v 5.7v v out ac-coupled10mv/div v in 200mv/div 400s/div v in = 5.2v to 5.7v v out = 5v c load = 0.1f max6126_21 turn-on transient max6126 toc23 20s/div gnd 5.5v v out 1v/div v in 2v/div c load = 0.1f v out = 2.048v max6126_50 turn-on transient max6126 toc24 gnd 5.5v v out 2v/div v in 2v/div gnd 200s/div c load = 0.1f v out = 5v max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 14 typical operating characteristics (continued) downloaded from: http:///
(v in = 5v for max6126_21/25/30/33/36/41, v in = 5.5v for max6126_50, c load = 0.1f, i out = 0, t a = +25c, unless otherwise speciied.) (note 5)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. 2.50102.5005 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 partsv out = 2.5v max6126_21 turn-on transient max6126 toc25 gnd 5.5v v out 1v/div v in 2v/div 40s/div c load = 10f v out = 2.048v 4.9994 4.99984.9996 5.00025.0000 5.0004 5.0006 0 400 200 600 800 1000 max6126b_50 long-term stability vs. time (so) max6126 toc29 time (hr) v out (v) two typical partsv out = 5v max6126_50 turn-on transient max6126 toc26 gnd 5.5v v out 2v/div v in 2v/div gnd 400s/div c load = 10f v out = 5v 5.00105.0005 5.0000 4.9995 4.9990 0 400 200 600 800 1000 max6126b_50 long-term stability vs. time (max) max6126 toc30 time (hr) v out (v) two typical partsv out = 5v 2.4994 2.49982.4996 2.50022.5000 2.5004 2.5006 0 400 200 600 800 1000 max6126b_25 long-term stability vs. time (so) max6126 toc27 time (hr) v out (v) two typical partsv out = 2.5v maxim integrated 15 www.maximintegrated.com max6126 ultra-high-precision, ultra-low-noise, series voltage reference typical operating characteristics (continued) downloaded from: http:///
detailed description wideband noise reduction to improve wideband noise and transient power-supply noise, add a 0.1f capacitor to nr ( figure 1 ). a 0.1f 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 . the 0.1hz to 10hz noise when measured with a 0.1f noise reduction capacitor (nr pin) is 0.9v p-p . using a 100f noise reduction capacitor (nr pin) reduces the 0.1hz to 10hz noise to 0.6v p-p . output bypassing the max6126 requires an output capacitor between 0.1f and 10f. 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 10f capacitor in parallel with a 0.1f capacitor. larger capacitor values reduce transients on the reference output.supply current the quiescent supply current of the series-mode max6126 family is typically 380a and is virtually independent of the supply voltage, with only a 2a/v (max) variation with supply voltage. when the supply voltage is below the minimum specified input voltage during turn-on, the device can draw up to 300a 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 = +25c before and after the device is cycled over its entire operating temperature range. the typical thermal 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 200s to 2ms depending on the device. the turn-on time can increase up to 4ms with the device operating at the minimum dropout voltage and the maximum load. a noise reduction capacitor of 0.1f 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 connecting 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 accuracy 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. figure 1. noise-reduction capacitor pin name function 1 nr noise reduction. connect a 0.1f 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 (0.1f to 10f) to gnd. nr outf *optional. 0.1f* outs reference output (v out + 200mv) to 12.6v input in gnd gnds max6126 * max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 16 pin description downloaded from: http:///
applications information precision current source figure 2 shows a typical circuit providing a precision current source. the outf output provides the bias current for the bipolar transistor. outs and gnds sense the voltage across the resistor and adjust the current sourced by outf accordingly. for even higher precision, use a mosfet to eliminate base current errors. the voltage range of outf is set by the reference output voltage (outs) and the v be (bjt) or v gs (mos) of the output external device: v outf = v be + v ref where:v outf is voltage on outf pin v be is base-emitter drop across bjt v ref is the actual voltage reference output this part is supposed to provide. it translates to supply voltage requirement for voltage reference: v in v drop (dropout voltage) + v bemax + v ref where:v drop is dropout voltage of voltage reference 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 coeficient 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 temperature 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 converter is dependent on the combination of many parameters such as integral nonlinearity, differential nonlinearity, offset error, gain error, as well as voltage reference changes. figure 2. precision current source figure 3. 14-bit high-resolution dac and positive reference from a single 3v supply outf i source r outs v out(nominal) / r = i source in gnd gnds max6126 outf outs in gnd gnds max6126 out ref analogoutput v dd 3v supply gnd max541 dac max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 17 downloaded from: http:///
figure 4. temperature coefficient vs. operating temperature range for a 1 lsb maximum error temperature coefficient (ppm/c) 1 10 100 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) nr outf *optional. * outs reference output (v out + 200mv) to 12.6v input in gnd gnds * max6126 load max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 18 chip information process: bicmos typical operating circuit downloaded from: http:///
+denotes a lead(pb)-free/rohs-compliant package. /v denotes an automotive qualified part. part temp range pin- package output voltage (v) maximum initial accuracy (%) maximum tempco (-40c to +85c) (ppm/c) max6126b21+ -40c to +125c 8 max 2.048 0.1 7 max6126aasa25+ -40c to +125c 8 so 2.500 0.02 3 max6126basa25+ -40c to +125c 8 so 2.500 0.06 5 max6126a25+ -40c to +125c 8 max 2.500 0.06 3 max6126b25+ -40c to +125c 8 max 2.500 0.1 7 max6126a28+ -40c to +125c 8 max 2.800 0.06 3 max6126b28+ -40c to +125c 8 max 2.800 0.1 7 max6126aasa30+ -40c to +125c 8 so 3.000 0.02 3 max6126basa30+ -40c to +125c 8 so 3.000 0.06 5 max6126a30+ -40c to +125c 8 max 3.000 0.06 3 max6126b30+ -40c to +125c 8 max 3.000 0.1 7 max6126aasa33+ -40c to +125c 8 so 3.300 0.02 3 max6126basa33+ -40c to +125c 8 so 3.300 0.06 5 max6126a33+ -40c to +125c 8 max 3.300 0.06 3 max6126b33+ -40c to +125c 8 max 3.300 0.1 7 max6126aasa36+ -40c to +125c 8 so 3.600 0.02 3 max6126basa36+ -40c to +125c 8 so 3.600 0.06 5 max6126a36+ -40c to +125c 8 max 3.600 0.06 3 max6126b36+ -40c to +125c 8 max 3.600 0.1 7 max6126aasa41+ -40c to +125c 8 so 4.096 0.02 3 max6126basa41+ -40c to +125c 8 so 4.096 0.06 5 max6126basa41/v+ -40c to +125c 8 so 4.096 0.06 5 max6126a41+ -40c to +125c 8 max 4.096 0.06 3 max6126b41+ -40c to +125c 8 max 4.096 0.1 7 max6126aasa50+ -40c to +125c 8 so 5.000 0.02 3 max6126basa50+ -40c to +125c 8 so 5.000 0.06 5 MAX6126A50+ -40c to +125c 8 max 5.000 0.06 3 max6126b50+ -40c to +125c 8 max 5.000 0.1 7 package type package code outline no. land pattern no. 8 max u8+1 21-0036 90-0092 8 so s8+4 21-0041 90-0096 max6126 ultra-high-precision, ultra-low-noise, series voltage reference www.maximintegrated.com maxim integrated 19 ordering information (continued) 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. downloaded from: http:///
revision number revision date description pages changed 0 10/02 initial release 1 3/03 remove future product and contact factory notes 1, 16 2 6/03 add a grade devices 1, 16 3 12/03 change max 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 7 4/16 updated typical operating characteristics section (added toc15) 14, 15 8 6/16 added electrical characteristics tables, text references, and ordering information references for 3.3v and 3.6v output options. 1, 6, 9C13, 17 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. ? 2016 maxim integrated products, inc. 20 max6126 ultra-high-precision, ultra-low-noise, series voltage reference 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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