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general description the max6072 is a dual-output precision series voltage reference. the product features two outputs, +v ref and +v ref /2. the device exhibits a very low 1/f noise of 2ppm (peak-to-peak). each output can source and sink 10ma and has an independent sense line. this product has a temperature drift of 6ppm/c (max) over the ambi - ent temperature range of -40c to +125c and an initial accuracy of 0.04%. three pairs of output voltages are available: 5v/2.5v, 4.096v/2.048v, and 2.5v/1.25v. the product operates with an input voltage range of 2.8v to 5.5v and has sufficient headroom for the highest voltage. it consumes a mere 150a (typ) of quiescent supply cur - rent per reference. the dual voltage outputs make this device ideal for precision adc applications where the input signal needs to be referred to v ref /2. the max6072 is available in a 10-pin max ? package and is specified for operation over the extended -40 c to +125 c industrial temperature range. applications adc/dac references and common-mode set-point test and measurement/ate high-accuracy industrial and process control portable medical beneits and features low temperature coefficient ensures stable system over wide temperature ranges ? a-grade: 6ppm/c (max) ? b-grade: 8ppm/c (max) excellent long-term drift ensures accurate signal chain readings over time ? 15ppm drift over 1,000 hours dual references (v ref and v ref /2) provide adc/ dac reference and common-mode reference ? max6072__50: v ref = 5v, v ref / 2 = 2.5v ? max6072__41: v ref = 4.096v, v ref / 2 = 2.048v ? max6072__25: v ref = 2.5v, v ref / 2 = 1.25v low thermal hysteresis ensures consistent results through temperature cycles ? 85ppm ? 2.5ppm thermal hysteresis tracking separate enable-control for each output allows independent control low power for battery-/loop-powered sensors: 150a/reference typical operating circuit and ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to www.maximintegrated.com/max6072.related . max is a registered trademark of maxim integrated products, inc. 19-7483; rev 0; 12/14 dual reference selector guide part output voltages (v) accuracy (%) temperature coefficient ( ppm /c) max6072aaub50 5/2.5 0.05 6 max6072baub50 5/2.5 0.08 8 max6072aaub41 4.096/2.048 0.05 6 MAX6072BAUB41 4.096/2.048 0.08 8 max6072aaub25 2.5/1.25 0.05 6 max6072baub25 2.5/1.25 0.08 8 max6072 high-precision, dual-output series voltage reference downloaded from: http:///
in1, in2 to gnd ...................................................... -0.3v to +6v out1f to gnd ............ -0.3v to the lower of (v in1 + 0.3v), +6v out2f to gnd ............ -0.3v to the lower of (v in2 + 0.3v), +6v out1s, out2s to gnd ......................................... -0.3v to +6v en1, en2 to gnd ................................................... -0.3v to +6v continuous power dissipation (t a = +70c) max (derate 5.6mw/c above +70c) ...................... 444mw operating temperature range ......................... -40c to +125c storage temperature ....................................... -65c to +150c junction temperature ...................................................... +150c lead temperature (soldering, 10s) ................................. +300c soldering temperature ................................................... +260c max junction-to-ambient thermal resistance ( ja ) ........ 180c/w junction-to-case thermal resistance ( jc ) ............... 42c/w (note 1) max6072_50 electrical characteristics (v ref1 : v out1f = 5v, v ref2 : v out2f = 2.5v) (v in1 = v en1 = v in2 = v en2 = +5.5v, i out = 0ma, c out = 0.1f, t a = -40c to +125c, unless otherwise noted. typical values are at t a =+25c.) (note 2) parameter symbol conditions min typ max units output output voltage accuracy (out1f and out2f) max6072a_50, t a = +25c -0.05 +0.05 % max6072b_50, t a = +25c -0.08 +0.08 output voltage temperature drift (out1f and out2f) (note 3) tcv out max6072a_50 1.5 6 ppm/c max6072b_50 2.0 8 output voltage temperature drift tracking (out1f and out2f) (note 3) ?tc max6072a_50 0.4 ppm/c max6072b_50 0.4 line regulation out1f, 5.2v < v in1 < 5.5v t a = +25c 200 620 v/v t a = -40c to +125c 700 out2f, 2.8v < v in2 < 5.5v t a = +25c 60 260 t a = -40c to +125c 275 load regulation 0ma < i out < 10ma, sink out1f 160 290 v/ma 0ma < i out < 10ma, source 160 350 0ma < i out < 10ma, sink out2f 80 185 0ma < i out < 10ma, source 75 190 max6072 high-precision, dual-output series voltage reference www.maximintegrated.com maxim integrated 2 note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial . 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. package thermal characteristics downloaded from: http:///
max6072_50 electrical characteristics (v ref1 : v out1f = 5v, v ref2 : v out2f = 2.5v) (continued) (v in1 = v en1 = v in2 = v en2 = +5.5v, i out = 0ma, c out = 0.1f, t a = -40c to +125c, unless otherwise noted. typical values are at t a =+25c.) (note 2) parameter symbol conditions min typ max units dropout voltage i out = 10ma, t a = -40c to +125c out1f (note 6) 60 150 mv out2f (note 4) 110 230 output current (out1f and out2f) i out -10 +10 ma short-circuit current (out1f and out2f) i sc sourcing to ground 25 ma sinking from v in 25 thermal hysteresis (note 5) out1f 85 ppm out2f 85 thermal hysteresis tracking (note 5) out2f to out1f 2.5 ppm long-term stability out1f, 1000 hours at t a = +25c 15 ppm out2f, 1000 hours at t a = +25c 15 long-term drift tracking 5 ppm dynamic characteristics noise voltage e out 1/f noise, 0.1hz to 10hz, c out = 0.1f out1f 9 v p-p out2f 4.8 thermal noise, 10hz to 10khz, c out = 0.1f out1f 15 v rms out2f 6 noise voltage spectral density thermal noise, f= 1khz, c out = 0.1f out1f 120 nv/ hz out2f 60 ripple rejection frequency = 60hz out1f 74 db out2f 84 turn- on settling time t r settling to 0.01%, c out = 0.1f out1f 50 s out2f 30 enable settling time t en settling to 0.01%, c out = 0.1f out1f 100 s out2f 75 max6072 high-precision, dual-output series voltage reference www.maximintegrated.com maxim integrated 3 downloaded from: http:///
max6072_50 electrical characteristics (v ref1 : v out1f = 5v, v ref2 : v out2f = 2.5v) (continued) (v in1 = v en1 = v in2 = v en2 = +5.5v, i out = 0ma, c out = 0.1f, t a = -40c to +125c, unless otherwise noted. typical values are at t a =+25c.) (note 2) max6072_41 electrical characteristics (v ref1 : v out1f = 4.096v, v ref2 : v out2f = 2.048v) (v in1 = v en1 = v in2 = v en2 = +5v, i out = 0ma, c out = 0.1f, t a = -40c to +125c, unless otherwise noted. typical values are at t a =+25c.) (note 2) parameter symbol conditions min typ max units capacitive-load stability range (out1f, out2f) i out 10ma 0.1 10 f input (in1 and in2) supply voltage v in guaranteed by line regulation out1f 5.2 5.5 v out2f 2.8 5.5 ref1 quiescent supply current i in t a = +25c 160 270 a t a = -40c to +125c 350 ref2 quiescent supply current i in t a = +25c 150 245 a t a = -40c to +125c 320 shutdown supply current per reference i sd v en = 0v 0.85 28 a enable (en1 and en2) enable input current i en -1 +1 a enable logic- high v ih 0.7 x v in v enable logic- low v il 0.3 x v in v parameter symbol conditions min typ max units output output voltage accuracy (out1f and out2f) max6072a_41, t a = +25c -0.05 +0.05 % max6072b_41, t a = +25c -0.08 +0.08 output voltage temperature drift (out1f and out2f) (note 3) tcv out max6072a_41 1.5 6 ppm/c max6072b_41 2.0 8 output voltage temperature drift tracking (out1f and out2f) (note 3) ?tc max6072a_41 0.4 ppm/c max6072b_41 0.4 line regulation out1f, 4.3v < v in1 < 5.5v t a = +25c 100 450 v/v t a = -40c to +125c 485 out2f, 2.7v < v in2 < 5.5v t a = +25c 50 250 t a = -40c to +125c 270 max6072 high-precision, dual-output series voltage reference www.maximintegrated.com maxim integrated 4 downloaded from: http:///
max6072_41 electrical characteristics (v ref1 : v out1f = 4.096v, v ref2 : v out2f = 2.048v) (continued) (v in1 = v en1 = v in2 = v en2 = +5v, i out = 0ma, c out = 0.1f, t a = -40c to +125c, unless otherwise noted. typical values are at t a =+25c.) (note 2) parameter symbol conditions min typ max units load regulation 0ma < i out < 10ma, sink out1f 125 260 v/ma 0ma < i out < 10ma, source 135 300 0ma < i out < 10ma, sink out2f 135 260 0ma < i out < 10ma, source 135 250 dropout voltage i out = 10ma, t a = -40c to +125c (note 6) out1f 75 150 mv output current (out1f and out2f) i out -10 +10 ma short-circuit current (out1f and out2f) i sc sourcing to ground 25 ma sinking from v in 25 thermal hysteresis (note 5) out1f 85 ppm out2f 85 thermal hysteresis tracking (note 5) out2f to out1f 2.5 ppm long-term stability out1f, 1000 hours at t a = +25c 15 ppm out2f, 1000 hours at t a = +25c 15 long-term drift matching 5 ppm dynamic characteristics noise voltage e out 1/f noise, 0.1hz to 10hz, c out = 0.1f out1f 9.6 v p-p out2f 6.4 thermal noise, 10hz to 10khz, c out = 0.1f out1f 12 v rms out2f 8.6 max6072 high-precision, dual-output series voltage reference www.maximintegrated.com maxim integrated 5 downloaded from: http:///
max6072_41 electrical characteristics (v ref1 : v out1f = 4.096v, v ref2 : v out2f = 2.048v) (continued) (v in1 = v en1 = v in2 = v en2 = +5v, i out = 0ma, c out = 0.1f, t a = -40c to +125c, unless otherwise noted. typical values are at t a =+25c.) (note 2) parameter symbol conditions min typ max units noise voltage spectral density thermal noise, f= 1khz, c out = 0.1f out1f 110 nv/ hz out2f 75 ripple rejection frequency = 60hz out1f 80 db out2f 86 turn- on settling time t r settling to 0.01%, c out = 0.1f out1f 40 s out2f 25 enable settling time t en settling to 0.01%, c out = 0.1f out1f 85 s out2f 65 capacitive- load stability range (out1f, out2f) i out 10ma 0.1 10 f input (in1 and in2) supply voltage v in guaranteed by line regulation out1f 4.3 5.5 v out2f 2.7 5.5 ref1 quiescent supply current i in t a = +25c 150 265 a t a = -40c to +125c 350 ref2 quiescent supply current i in t a = +25c 130 220 a t a = -40c to +125c 280 shutdown supply current per reference i sd v en = 0v 0.85 28 a enable (en1 and en2) enable input current i en -1 +1 a enable logic- high v ih 0.7 x v in v enable logic- low v il 0.3 x v in v max6072 high-precision, dual-output series voltage reference www.maximintegrated.com maxim integrated 6 downloaded from: http:///
max6072_25 electrical characteristics (v ref1 : v out1f = 2.5v, v ref2 : v out2f = 1.25v) (v in1 = v en1 = v in2 = v en2 = +5v, i out = 0ma, c out = 0.1f, t a =-40c to +125c, unless otherwise noted. typical values are at t a =+25c.) (note 2) parameter symbol conditions min typ max units output output voltage accuracy (out1f and out2f) max6072a_25, t a = +25c -0.05 +0.05 % max6072b_25, t a = +25c -0.08 +0.08 output voltage temperature drift (out1f and out2f, note 3) tcv out max6072a_25 1.5 6 ppm/c max6072b_25 2.0 8 output voltage temperature drift tracking (out1f and out2f) (note 3) ?tc max6072a_25 0.4 ppm/c max6072b_25 0.4 line regulation out1f, 2.8v < v in1 < 5.5v t a = +25c 60 260 v/v t a = -40c to +125c 275 out2f, 2.75v < v in2 < 5.5v t a = +25c 13 190 t a = -40c to +125c 200 load regulation 0ma < i out < 10ma, sink out1f 80 185 v/ma 0ma < i out < 10ma, source 75 190 0ma < i out < 10ma, sink out2f 70 185 0ma < i out < 10ma, source 100 190 dropout voltage i out = 10ma, t a = -40c to +125c (note 6) out1f 110 230 mv output current (out1f and out2f) i out -10 +10 ma short-circuit current (out1f and out2f) i sc sourcing to ground 25 ma sinking from v in 25 thermal hysteresis (note 5) out1f 85 ppm out2f 85 thermal hysteresis tracking (note 5) out2f to out1f 2.5 ppm long-term stability out1f, 1000 hours at t a = +25c 15 ppm out2f, 1000 hours at t a = +25c 20 max6072 high-precision, dual-output series voltage reference www.maximintegrated.com maxim integrated 7 downloaded from: http:///
max6072_25 electrical characteristics (v ref1 : v out1f = 2.5v, v ref2 : v out2f = 1.25v) (continued) (v in1 = v en1 = v in2 = v en2 = +5v, i out = 0ma, c out = 0.1f, t a =-40c to +125c, unless otherwise noted. typical values are at t a =+25c.) (note 2) parameter symbol conditions min typ max units long-term drift tracking 7 ppm dynamic characteristics noise voltage e out 1/f noise, 0.1hz to 10hz, c out = 0.1f out1f 4.8 v p-p out2f 3.6 thermal noise, 10hz to 10khz, c out = 0.1f out1f 6 v rms out2f 5 noise voltage spectral density thermal noise, f= 1khz, c out = 0.1f out1f 60 nv/ hz out2f 50 ripple rejection frequency = 60hz out1f 84 db out2f 100 turn-on settling time t r settling to 0.01%, c out = 0.1f out1f 30 s out2f 20 enable settling time t en settling to 0.01%, c out = 0.1f out1f 75 s out2f 60 capacitive-load stability range (out1f, out2f) i out 10ma 0.1 10 f input (in1 and in2) supply voltage v in guaranteed by line regulation out1f 2.8 5.5 v out2f 2.75 5.5 ref1 quiescent supply current i in t a = +25c 150 245 a t a = -40c to +125c 320 ref2 quiescent supply current i in t a = +25c 130 210 a t a = -40c to +125c 260 shutdown supply current per reference i sd v en = 0v 0.6 28 a max6072 high-precision, dual-output series voltage reference www.maximintegrated.com maxim integrated 8 downloaded from: http:///
note 2: all devices are 100% production tested at t a = +25c. specifications over the entire operating temperature range are guar - anteed by design and characterization. typical specifications are at t a = +25c. note 3: temperature coefficient is calculated using the box method which measures temperature drift as the maximum voltage variation over a specified temperature range. the unit of measurement is ppm/c. temperature coefficient matching ( ? tc) ic calculated using the box method which measures temperature drift as the maxi - mum variation of the difference between the normalized output voltages, v out2_norm and v out1_norm (over a specified temperature range). the unit of measurement is ppm/c, v out_norm = [(v out (t) - v out (25c))/v out (25c)] note 4: dropout voltage is defined as the minimum differential voltage (v in - v out ) at which v out decreases by 0.2% from its original value at v in = 5.0v. note 5: thermal hysteresis is defined as the change in +25c output voltage before and after cycling the device from t max to t min . thermal hysteresis matching is defined as the difference of the thermal hysteresis for each output (out1 and out2): ? th = th out2 - th out1 note 6: dropout voltage is defined as the minimum differential voltage (v in - v out ) at which v out decreases by 0.2% from its original value at v in = 5.5v. max6072_25 electrical characteristics (v ref1 : v out1f = 2.5v, v ref2 : v out2f = 1.25v) (continued) (v in1 = v en1 = v in2 = v en2 = +5v, i out = 0ma, c out = 0.1f, t a =-40c to +125c, unless otherwise noted. typical values are at t a =+25c.) (note 2) parameter symbol conditions min typ max units enable (en1 and en2)enable input current i en -1 +1 a enable logic-high v ih 0.7 x v in _ v enable logic-low v il 0.3 x v in_ v max6072 high-precision, dual-output series voltage reference www.maximintegrated.com maxim integrated 9 downloaded from: http:///
(v in1 = v in2 = v en1 = v en2 = +5.5v (max6072_50), v in1 = v in2 = v en1 = v en2 (max6072_41 and max6072_25), i out = 0ma, c out = 0.1f, t a = +25c, unless otherwise noted.) -40 -30 -20 -10 0 10 20 30 40 0 200 400 600 800 1000 1200 output voltage change (ppm) duration (hours) long - term drift max6072_50 (v out2 = v ref /2 = 2.5v) toc1b 10 typical units -40 -30 -20 -10 0 10 20 30 40 0 200 400 600 800 1000 1200 output voltage change (ppm) duration (hours) long - term drift max6072_41 (v out1 = v ref = 4.096v) toc1c 10 typical units -40 -30 -20 -10 0 10 20 30 40 0 200 400 600 800 1000 1200 output voltage change (ppm) duration (hours) long term drift max6072_50 v out1 = v ref = 5.0v toc1a 10 typical units 2.5v v out voltage temperature drift toc02b temperature (c) output voltage (v) 100 75 50 25 0 -25 2.4995 2.5000 2.5005 2.50102.4990 -50 125 4.096v v out voltage temperature drift toc02c temperature (c) output voltage (v) 100 75 50 25 0 -25 4.0945 -50 125 4.0950 4.0955 4.0960 4.0965 4.0970 4.0975 1.25v v out voltage temperature drift toc02a temperature (c) output voltage (v) 100 75 50 25 0 -25 1.2497 1.2500 1.2502 1.25051.2495 -50 125 -40 -30 -20 -10 0 10 20 30 40 0 200 400 600 800 1000 1200 output voltage change (ppm) duration (hours) long - term drift max6072_25 (v out1 = v ref = 2.5v) toc1e 10 typical units -40 -30 -20 -10 0 10 20 30 40 0 200 400 600 800 1000 1200 output voltage change (ppm) duration (hours) long - term drift max6072_25 v out2 = v ref/2 = 1.25v toc1f typical 10 units -40 -30 -20 -10 0 10 20 30 40 0 200 400 600 800 1000 1200 output voltage change (ppm) duration (hours) long - term drift max6072_41 (v out2 = v ref /2 = 2.048v) toc1d 10 typical units max6072 high-precision, dual-output series voltage reference maxim integrated 10 www.maximintegrated.com typical operating characteristics downloaded from: http:///
(v in1 = v in2 = v en1 = v en2 = +5.5v (max6072_50), v in1 = v in2 = v en1 = v en2 (max6072_41 and max6072_25), i out = 0ma, c out = 0.1f, t a = +25c, unless otherwise noted.) typical operating characteristics (continued) 2.5v v out line regulation toc03 input voltage (v) supply current (ma) 4.8 4.1 3.4 2.4995 2.5000 2.5005 2.50102.4990 2.7 5.5 1.25v v out psrr vs. frequency toc05a frequency (hz) psrr (db) 10k 1k 100 20 40 60 80 100 120 0 10 100k 2.5v v out psrr vs. frequency toc05b frequency (hz) psrr (db) 10k 1k 100 10 20 30 40 50 60 70 80 90 100 0 10 100k 4.096v v out psrr vs. frequency toc05c frequency (hz) psrr (db) 10k 1k 100 90 0 10 100k 10 20 30 40 50 60 70 80 2.5v v out load regulation toc04 output current (ma) output voltage (v) 5 0 -5 2.4990 2.4995 2.5000 2.5005 2.5010 2.5015 2.50202.4985 -10 10 t a = +85c t a = +125c t a = 0c t a = -40c 1.25v v out output impedance vs. frequency toc06a frequency (hz) output impedance (?) 10k 1k 100 0.1 0.2 0. 0. 0. 0.6 0. 0. 0 10 100k 1a ourcin 1a inin 2.5v v out output impedance vs. frequency toc06b frequency (hz) output impedance (?) 10k 1k 100 0.1 0.2 0. 0. 0. 0.6 0. 0. 0 10 100k 1a inin 1a ourcin 4.096v v out output impedance vs. frequency toc06c frequency (hz) output impedance (?) 10k 1k 100 1.2 0 10 100k 1ma ourcin 1ma inin 0.2 0. 0.6 0. 1.0 max6072a/max6072b high-precision, dual-output series voltage references maxim integrated 11 www.maximintegrated.com downloaded from: http:///
(v in1 = v in2 = v en1 = v en2 = +5.5v (max6072_50), v in1 = v in2 = v en1 = v en2 (max6072_41 and max6072_25), i out = 0ma, c out = 0.1f, t a = +25c, unless otherwise noted.) 1.25v v out output noise density vs. frequency toc09a frequency (hz) output noise density (nv/ hz ) 100 1k 10 100 1k 1 10 10k c f 01f c f 0f 1.25v v out output noise (0.1hz to 10hz) toc08a 2v/div 1s/div v out = 1.25v 2.5v v out output noise (0.1hz to 10hz) toc08b 2v/div 1s/div v out = 2.50v 4.096v v out output noise (0.1hz to 10hz) toc08c 4v/div 1s/div v out = 4.096v 2.5v v out output noise density vs. frequency toc09b frequency (hz) output noise density (nv/ hz ) 100 1k 10 100 1k 1 10 10k c f 01f c f 0f 4.096v v out output noise density vs. frequency toc09c frequency (hz) output noise density (nv/ hz ) 100 1k 10 100 1k 1 10 10k c f = 01f c f = 0f 1.25v v out supply current vs. temperature toc07a temperature (c) 100 75 50 25 0 -25 -50 125 supply current (a) 20 40 60 80 120 140 160 180 200 0 100 v in = 5.5v v in = 2.7v 2.5v v out supply current vs. temperature toc07b temperature (c) supply current (a) 100 75 50 25 0 -25 50 100 150 200 250 0 -50 125 v in = 2.8v v in = 5.5v 50 100 150 200 4.096v v out supply current vs. temperature toc07c temperature (c) 100 75 50 25 0 -25 -50 125 supply current (a) 250 0 v in = 5.5v v in = 4.3v max6072 high-precision, dual-output series voltage reference maxim integrated 12 www.maximintegrated.com typical operating characteristics (continued) downloaded from: http:///
(v in1 = v in2 = v en1 = v en2 = +5.5v (max6072_50), v in1 = v in2 = v en1 = v en2 (max6072_41 and max6072_25), i out = 0ma, c out = 0.1f, t a = +25c, unless otherwise noted.) 1.25v v out turn-on transient toc10a v in = 0v v in = 5v v out = 1.25v v out = 0v 10s/div 0.01% settlingtime = 21s 2.5v v out turn-on transient toc10b v in 0v v in = 5v v out = 2.5v v out 0v 10s/div 0.01% settlingtime = 33s 4.096v v out turn-on transient toc10c v in = 0v v out = 4.096v v out = 0v 10s/div 0.01% settlingtime = 41s v in = 5v 1.25v v out 10ma load transient (c out = 0.1f) toc11a v out = 1.25v 200mv/div i out v out source 10ma sink 10ma 10s/div 2.5v v out 10ma load transient (c out = 0.1f) toc11b v out = 2.5v 500mv/div i out v out source 10ma sink 10ma 10s/div 1.25v v out line transient (c out = 0.1f) toc12a v in = 4.35v v out 20mv/div 20s/div v in = 3.85v v in 200mv/div 4.096v v out 10ma load transient (c out = 0.1f) toc11c v out = 4.096v 1v/div i out v out source 10ma sink 10ma 10s/div max6072 high-precision, dual-output series voltage reference maxim integrated 13 www.maximintegrated.com typical operating characteristics (continued) downloaded from: http:///
(v in1 = v in2 = v en1 = v en2 = +5.5v (max6072_50), v in1 = v in2 = v en1 = v en2 (max6072_41 and max6072_25), i out = 0ma, c out = 0.1f, t a = +25c, unless otherwise noted.) 1.25v v out enable transient toc13 v in = 0v v in = 5v v out = 1.25v v out = 0v 10s/div 0.01% settlin g time = 63 s 2.5v v out enable transient toc14 v in = 0v v out = 0v 10s/div v in = 5v v out = 2.5v 0 .01% settling time = 75s 4.096v v out enable transient toc15 v in = 0v v out = 0v 10 s/div v in = 5v v out = 4.096v 0 .01% settling time = 85 s 2.5v v out line transient (c out = 0.1f) toc12b v in = 4.35v v out 20mv/div 20s/div v in = 3.85v v in 200mv/div 4.096v v out line transient (c out = 0.1f) toc12c v in = 5.25v v out 200mv/div 20s/div v in = 4.75v v in 200mv/div max6072 high-precision, dual-output series voltage reference maxim integrated 14 www.maximintegrated.com typical operating characteristics (continued) downloaded from: http:///
pin name function 1 out1f v ref reference 1 (v out1f ) force output. short out1f to out1s as close as possible to the load. bypass with a capacitor (0.1f to 10f) to gnd. 2 out1s v ref voltage reference 1 (v out1s) sense 3, 8 gnd ground. both the pins 3 and 8 must be externally connected to a solid ground plane. 4 en2 voltage reference 2 enable input. drive high to enable v ref2 . drive low to disable v ref2 . 5 in2 voltage reference 2 supply input 6 out2f v ref /2 voltage reference 2 (v out2f ) force output. short out2f to out2s as close as possible to the load. bypass with a capacitor (0.1f to 10f) to gnd. 7 out2s v ref /2 voltage reference 2 (v out2s ) sense 9 en1 voltage reference 1 enable input. drive high to enable v ref1 . drive low to disable v ref1 . 10 in1 voltage reference 1 supply input top view 10 23 4 5 98 7 6 out2f out2s gnd en1 max + 1 in1 max6072 out1fout1s gnd en2 in2 max6072 high-precision, dual-output series voltage reference www.maximintegrated.com maxim integrated 15 pin conigurationpin description downloaded from: http:///
detailed description output force and sense the max6072 provides independent kelvin connections for the power-circuit output (outf) supplying current to the load and 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 max6072 and the load. when using the kelvin connection made possible by the independent current and voltage connections, connect outf to the load and connect outs to outf at the point where the voltage accuracy is most needed (see figure 1 ). output bypassing the max6072 requires an output capacitor between 0.1f and 10f. place the output capacitor as close to out_f as possible. for applications driving switching capacitive loads or rapidly changing load currents, use a 10f capacitor in parallel with a 0.1f capacitor. larger capacitor values reduce transients on the reference out - put. supply voltage each of the max6072 references offers individual supply voltage inputs (in1 and in2). in1 supplies the power to v ref1 and in2 for v ref2 . each of the two references can be powered up separately or from the same supply voltage by shorting in1 and in2 together. in in1 out1f en1 out2f out2s bandgap voltage reference bandgap voltage reference out1s in2 in en2 max6072 gnd gnd figure 1. reference output kelvin connection en1en2 0.1 f 0.1 f to 10 f supply load load in1 in2 max6072 out1s out1f out2s out2f 0.1 f to 10 f max6072 high-precision, dual-output series voltage reference www.maximintegrated.com maxim integrated 16 functional diagram downloaded from: http:///
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 hyster - esis value is 85ppm. turn-on time the device typically turns on and settles to within 0.01% of their final value in 25s to 40s. the turn-on time can increase up to 4ms with the device operating at the mini - mum dropout voltage and the maximum load. applications information accurate reference by using the other refer- ence output as the supply input in certain applications where only a single reference is required, the dual reference can be used as a single ref - erence output when one of its references (v out1f where v out1f > v out2f ) is used as the supply input for the second internal reference of the part (see figure 2). by doing so, the output reference accuracy is improved as the psrr performance improves. since both the refer - ences are present in the same package, they exhibit the same thermal trend in variation. dual referencing fully differential ampliier and adc applications employing a fully differential amplifier and adc in a signal chain typically require maintaining the input(s) at half the v ref (v) for the common-mode volt - age being applied to the adc. for this purpose, either a second reference with the value v ref_diff_amp = v ref /2, or an op amp is often used as output common- mode biasing. the max6072a/b series is used with ease in these situations, where v ref_diff_amp can be referenced from the v ref2 available from the part. this way, both the v ref and v ref /2 to the adc and the dif - ferential amplifier are provided by the same part providing improved accuracy and lesser board space. see figure 3 . the typical operating circuit shows max6072a_41 used in a signal chain, performing single-ended to differential conversion. figure 2. increasing the accuracy of reference en1 en2 0.1 f 0.1 f to 10 f noisy supply load in1 in2 max6072 out1s out1f out2s out2f reference 1:vout1 reference 2:vout2 0.1 f to 10 f max6072 high-precision, dual-output series voltage reference www.maximintegrated.com maxim integrated 17 downloaded from: http:///
figure 3. fully differential amplifier and adc with dual referencing from max6072_25 v s+ v clph v clpl v s- out+ out- 10 ? 10 ? 1 k? 1 k? 1 k? 1 k? 2nf +5v -5v max44205 vocm v ref a vdd gnd gnd 3.3v 2.8v to 5.5v a in+ a in- 10f 0.1f 1nf 1nf - ++ - v cm v sig v sig max6072_25 out2f out2s out1s out1f in1 in2 en1 en2 10f v ref1 = 2.500v v ref2 = 1.250v 1.250v 2.5v 1 f max6072 high-precision, dual-output series voltage reference www.maximintegrated.com maxim integrated 18 downloaded from: http:///
v s+ v clph v clpl v s- out+ out- 10 ? 10 ? 1k ? 1k ? 1k ? 1k ? 2nf +5.5v -5.5v max44205 vocm v ref a vdd gnd gnd 5v 5.5v a in+ a in- 10f 0.1f 1nf 1nf - + v sig out2f out2s out1s out1f in1 in2 en1 en2 10f v ref1 = 4.096v v ref2 = 2.048v 2.048v 4.096v 2.048v 2.048v +2v -2v 0v max6072_41 1f typical operating circuit single-ended to differential conversion max6072 high-precision, dual-output series voltage reference www.maximintegrated.com maxim integrated 19 downloaded from: http:///
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. ordering information note: all devices are speciied over the -40 c to +125 c oper - ating temperature range. + denotes a lead(pb)-free/rohs-compliant package. part pin- package v ref1 /v ref2 max6072a aub25+ 10 max 2.500v/1.250v max6072aaub41+ 10 max 4.096v/2.048v max6072aaub50+ 10 max 5.000v/2.500v max6072b aub25+ 10 max 2.500v/1.250v MAX6072BAUB41+ 10 max 4.096v/2.048v max6072baub50+ 10 max 5.000v/2.500v package type package code outline no. land pattern no. 10 max u10m+5 21-0061 90-0330 max6072 high-precision, dual-output series voltage reference www.maximintegrated.com maxim integrated 20 chip information process: bicmos downloaded from: http:///
revision history revision number revision date description pages changed 0 12/14 initial release 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. max6072 high-precision, dual-output series voltage reference ? 2014 maxim integrated products, inc. 21 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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