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general description the max6143 is a low-noise, high-precision voltage ref- erence. the device features a proprietary temperature- coefficient curvature-correction circuit and laser-trimmed thin-film resistors that result in a very low 3ppm/ c temperature coefficient and excellent 0.06% initial accuracy. the max6143 provides a temp output where the output voltage is proportional to die tempera- ture, making the device suitable for a wide variety of temperature-sensing applications. the device also pro- vides a trim input, allowing fine trimming of the output voltage with a resistive-divider network. low tempera- ture drift and low noise make the max6143 ideal for use with high-resolution a/d or d/a converters. the max6143 provides accurate preset +2.5v, +3.3v, +4.096v, +5.0v, and +10v reference voltages and accepts input voltages up to +40v. the device draws 340? of supply current and sources 30ma or sinks 2ma of load current. the active-low shutdown feature ( shdn ) reduces supply current to 0.01a. the max6143 uses bandgap technology for low-noise performance and excellent accuracy. the max6143 does not require an output bypass capacitor for stability, and is stable with capacitive loads up to 100?. eliminating the output bypass capacitor saves valuable board area in space- critical applications. the max6143 is available in an 8-pin so package and operates over the automotive (-40 c to +125 c) tem- perature range. applications a/d converters voltage regulators d/a converters threshold detectors digital voltmeters features ? wide (v out + 2v) to +40v supply voltage range ? excellent temperature stability: 3ppm/ c (max) ? tight initial accuracy: 0.05% (max) ? low noise: 3.8v p-p (typ at 2.5v output) ? sources up to 30ma output current ? low supply current: 450a (max at +25 c) ? low 0.01a shutdown current ? linear temperature transducer voltage output ? +2.5v, +3.3v, +4.096v, +5.0v, or +10v output voltages ? wide operating temperature range: -40 c to +125 c ? no external capacitors required for stability max6143 high-precision voltage reference with t emperature sensor ________________________________________________________________ maxim integrated products 1 19-3168; rev 1; 4/04 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. pin configuration appears at end of data sheet. ordering information/selector guide part temp range pin- package output voltage (v) temperature coefficient ( ppm/ c) 40 c to +125 c initial accuracy (%) max6143aasa25 -40 c to +125 c 8 so 2.500 3 0.06 max6143basa25 -40 c to +125 c 8 so 2.500 10 0.10 max6143aasa33 -40 c to +125 c 8 so 3.300 3 0.06 MAX6143BASA33 -40 c to +125 c 8 so 3.300 10 0.10 max6143aasa41 -40 c to +125 c 8 so 4.096 3 0.06 max6143basa41 -40 c to +125 c 8 so 4.096 10 0.10 max6143aasa50 -40 c to +125 c 8 so 5.000 3 0.06 max6143basa50 -40 c to +125 c 8 so 5.000 10 0.10 max6143aasa10 -40 c to +125 c 8 so 10.000 3 0.05 max6143basa10 -40 c to +125 c 8 so 10.000 10 0.10 in out gnd *optional. * * * ( v out + 2v) to 40v input reference output shdn trim temp max6143 t ypical operating circuit
max6143 high-precision voltage reference with t emperature sensor 2 _______________________________________________________________________________________ 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. in to gnd ...............................................................-0.3v to +42v out, shdn , trim, temp to gnd...............-0.3v to (v in + 0.3v) output short circuit to gnd .....................................................5s continuous power dissipation (t a = +70 c) 8-pin so (derate 5.9mw/ c above +70 c) ..................471mw operating temperature range ........................-40 c to +125 c junction temperature .....................................................+150 c storage temperature range ............................-65 c to +150 c lead temperature (soldering, 10s) ................................+300 c electrical characteristics?max6143_25 (v out = 2.5v) (v in = v shdn = +5v, t a = -40 c to +125 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units output max6143a_25 (0.06%) 2.4985 2.5 2.5015 output voltage v out no load, t a = +25 c max6143b_25 (0.1%) 2.4975 2.5 2.5025 v output adjustment range ? v trim r pot = 10k ? 3 6% max6143aasa 1.5 3 output-voltage temperature coefficient (note 2) tcv out t a = -40 c to +125 c max6143basa 3 10 ppm/ c t a = +25 c 0.6 5 line regulation (note 3) ? v out / ? v in 4.5v v in 40v t a = -40 c to +125 c 0.8 10 ppm/v t a = +25 c210 sourcing: 0 i out 10ma t a = -40 c to +125 c215 t a = +25 c50 500 load regulation (note 3) ? v out / ? i out sinking: -0.6ma i out 0 t a = -40 c to +125 c90 900 ppm/ma out shorted to gnd 60 output short-circuit current i sc out shorted to in 3 ma temperature hysteresis (note 4) ? v out / cycle 120 ppm long-term stability ? v out / time 1000 hours at t a = +25 c50 ppm dynamic f = 0.1hz to 10hz 3.8 ? p-p noise voltage e out f = 10hz to 1khz 6.8 ? rms turn-on settling time t r to v out = 0.1% of final value, c out = 50pf 150 ? input supply voltage range v in guaranteed by line regulation test 4.5 40.0 v t a = +25 c 300 450 quiescent supply current i i n no load, normal operation t a = -40 c to +125 c 600 ? shutdown supply current i shdn no load, v shdn < 0.8v t a = -40 c to +125 c 0.01 5a
max6143 high-precision voltage reference with t emperature sensor _______________________________________________________________________________________ 3 electrical characteristics?max6143_33 (v out = 3.3v) (v in = v shdn = +10v, t a = -40 c to +125 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units output max6143a_33 (0.06%) 3.2980 3.3 3.3020 output voltage v out no load, t a = +25 c max6143b_33 (0.1%) 3.2967 3.3 3.3033 v output adjustment range ? v trim r pot = 10k ? 3 6% max6143aasa 1.5 3 output-voltage temperature coefficient (note 2) tcv out t a = -40 c to +125 c max6143basa 3 10 ppm/ c t a = +25 c 0.6 5 line regulation (note 3) ? v out / ? v in 5.3v v in 40v t a = -40 c to +125 c 0.8 10 ppm/v t a = +25 c210 sourcing: 0 i out 10ma t a = -40 c to +125 c215 t a = +25 c50 500 load regulation (note 3) ? v out / ? i out sinking: -0.6ma i out 0 t a = -40 c to +125 c90 900 ppm/ ma out shorted to gnd 60 output short-circuit current i sc out shorted to in 3 ma temperature hysteresis (note 4) ? v out / cycle 120 ppm long-term stability ? v out / time 1000 hours at t a = +25 c50 ppm dynamic f = 0.1hz to 10hz 5 ? p-p noise voltage e out f = 10hz to 1khz 9.3 ? rms turn-on settling time t r to v out = 0.1% of final value, c out = 50pf 180 ? electrical characteristics?max6143_25 (v out = 2.5v) (continued) (v in = v shdn = +5v, t a = -40 c to +125 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units shutdown ( shdn ) logic-high input voltage v ih 2.0 v logic-low input voltage v il 0.8 v logic-high input current i ih 20 a logic-low input current i il 2a temp output temp output voltage v temp 570 mv temp temperature coefficient tc temp 1.9 mv/ c
max6143 high-precision voltage reference with t emperature sensor 4 _______________________________________________________________________________________ electrical characteristics?max6143_41 (v out = 4.096v) (v in = v shdn = +10v, t a = -40 c to +125 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units output max6143a_41 (0.06%) 4.0935 4.096 4.0985 output voltage v out no load, t a = +25 c max6143b_41 (0.1%) 4.0919 4.096 4.1001 v output adjustment range ? v trim r pot = 10k ? 3 6% max6143aasa 1.5 3 output-voltage temperature coefficient (note 2) tcv out t a = -40 c to +125 c max6143basa 3 10 ppm/ c t a = +25 c 0.6 5 line regulation (note 3) ? v out / ? v in 6.1v v in 40v t a = -40 c to +125 c 0.8 10 ppm/v t a = +25 c210 sourcing: 0 i out 10ma t a = -40 c to +125 c215 t a = +25 c50 500 load regulation (note 3) ? v out / ? i out sinking: -0.6ma i out 0 t a = -40 c to +125 c90 900 ppm/ma out shorted to gnd 60 output short-circuit current i sc out shorted to in 3 ma temperature hysteresis (note 4) ? v out / cycle 120 ppm long-term stability ? v out / time 1000 hours at t a = +25 c50 ppm electrical characteristics?max6143_33 (v out = 3.3v) (continued) (v in = v shdn = +10v, t a = -40 c to +125 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units input supply voltage range v in guaranteed by line regulation test 5.3 40.0 v t a = +25 c 320 500 quiescent supply current i in no load, normal operation t a = -40 c to +125 c 650 ? shutdown supply current i shdn no load, v shdn < 0.8v t a = -40 c to +125 c 0.01 5a shutdown ( shdn ) logic-high input voltage v ih 2.0 v logic-low input voltage v il 0.8 v logic-high input current i ih 20 ? logic-low input current i il 2a temp output temp output voltage v temp 630 mv temp temperature coefficient tc temp 2.1 mv/ c
max6143 high-precision voltage reference with t emperature sensor _______________________________________________________________________________________ 5 electrical characteristics?max6143_50 (v out = 5.0v) (v in = v shdn = +15v, t a = -40 c to +125 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units output max6143a_50 (0.06%) 4.9970 5.0 5.0030 output voltage v out no load, t a = +25 c max6143b_50 (0.1%) 4.9950 5.0 5.0050 v output adjustment range ? v trim r pot = 10k ? 3 6% max6143aasa 1.5 3 output-voltage temperature coefficient (note 2) tcv out t a = -40 c to +125 c max6143basa 3 10 ppm/ c t a = +25 c 0.6 5 line regulation (note 3) ? v out / ? v in 7v v in 40v t a = -40 c to +125 c 0.8 10 ppm/v t a = +25 c210 sourcing: 0 i out 10ma t a = -40 c to +125 c215 t a = +25 c50 500 load regulation (note 3) ? v out / ? i out sinking: -0.6ma i out 0 t a = -40 c to +125 c90 900 ppm/ma electrical characteristics?max6143_41 (v out = 4.096v) (continued) (v in = v shdn = +10v, t a = -40 c to +125 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units dynamic f = 0.1hz to 10hz 7 ? p-p noise voltage e out f = 10hz to 1khz 11.5 ? rms turn-on settling time t r to v out = 0.1% of final value, c out = 50pf 200 ? input supply voltage range v in guaranteed by line regulation test 6.1 40.0 v t a = +25 c 320 500 quiescent supply current i in no load, normal operation t a = -40 c to +125 c 650 ? shutdown supply current i shdn no load, v shdn < 0.8v t a =-40 c to +125 c 0.01 5a shutdown ( shdn ) logic-high input voltage v ih 2.0 v logic-low input voltage v il 0.8 v logic-high input current i ih 20 ? logic-low input current i il 2a temp output temp output voltage v temp 630 mv temp temperature coefficient tc temp (0.06%) 2.1 mv/ c
max6143 high-precision voltage reference with t emperature sensor 6 _______________________________________________________________________________________ electrical characteristics?max6143_50 (v out = 5.0v) (continued) (v in = v shdn = +15v, t a = -40 c to +125 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units out shorted to gnd 60 output short-circuit current i sc out shorted to in 3 ma temperature hysteresis (note 4) ? v out / cycle 120 ppm long-term stability ? v out / time 1000 hours at t a = +25 c50 ppm dynamic f = 0.1hz to 10hz 9 ? p-p noise voltage e out f = 10hz to 1khz 14.5 ? rms turn-on settling time t r to v out = 0.1% of final value, c out = 50pf 230 ? input supply voltage range v in guaranteed by line regulation test 7 40 v t a = +25 c 320 550 quiescent supply current i in no load, normal operation t a = -40 c to +125 c 700 ? shutdown supply current i shdn no load, v shdn < 0.8v t a = -40 c to +125 c 0.01 5a shutdown ( shdn ) logic-high input voltage v ih 2.0 v logic-low input voltage v il 0.8 v logic-high input current i ih 20 ? logic-low input current i il 2a temp output temp output voltage v temp 630 mv temp temperature coefficient tc temp 2.1 mv/ c electrical characteristics?max6143_10 (v out = 10v) (v in = v shdn = +15v, t a = -40 c to +125 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units output max6143a_10 (0.05%) 9.995 10.0 10.005 output voltage v out no load, t a = +25 c max6143b_10 (0.1%) 9.990 10.0 10.010 v output adjustment range ? v trim r pot = 10k ? 3 6% max6143aasa 1.5 3 output-voltage temperature coefficient (note 2) tcv out t a = -40 c to +125 c max6143basa 3 10 p p m / c t a = +25 c 0.6 5 line regulation (note 3) ? v out / ? v in 12v v in 40v t a = -40 c to +125 c 0.8 10 ppm/v
max6143 high-precision voltage reference with t emperature sensor _______________________________________________________________________________________ 7 electrical characteristics?max6143_10 (v out = 10v) (continued) (v in = v shdn = +15v, t a = -40 c to +125 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units t a = +25 c210 sourcing: 0 i out 10ma t a = -40 c to +125 c215 t a = +25 c50 500 load regulation (note 3) ? v out / ? i out sinking: -0.6ma i out 0 t a = -40 c to +125 c 90 900 p p m /m a out shorted to gnd 60 output short-circuit current i sc out shorted to in 3 ma temperature hysteresis (note 4) ? v out / cycle 120 ppm long-term stability ? v out / time 1000 hours at t a = +25 c50 ppm dynamic f = 0.1hz to 10hz 18 ? p-p noise voltage e out f = 10hz to 1khz 29 ? rms turn-on settling time t r to v out = 0.1% of final value, c out = 50pf 400 ? input supply voltage range v in guaranteed by line regulation test 12 40 v t a = +25 c 340 550 quiescent supply current i in no load, normal operation t a = -40 c to +125 c 700 ? shutdown supply current i shdn no load, v shdn < 0.8v t a = -40 c to +125 c 0.01 5a shutdown ( shdn ) logic-high input voltage v ih 2.0 v logic-low input voltage v il 0.8 v logic-high input current i ih 20 ? logic-low input current i il 2a temp output temp output voltage v temp 630 mv temp temperature coefficient tc temp 2.1 mv/ c note 1: all devices are 100% production tested at t a = +25 c and guaranteed by design over t a = t min to t max , as specified. note 2: temperature coefficient is defined as ? v out divided by the temperature range. note 3: line and load regulation specifications do not include the effects of self-heating. note 4: thermal hysteresis is defined as the change in +25 c output voltage before and after cycling the device from t max to t min .
max6143 high-precision voltage reference with t emperature sensor 8 _______________________________________________________________________________________ 2.498 2.500 2.499 2.501 2.502 output voltage vs. temperature (v out = 2.5v) max6143toc01 temperature ( c) output voltage (v) -50 25 50 -25 0 75 100 125 three typical parts 9.993 9.998 9.995 10.001 9.999 9.996 10.002 9.997 9.994 10.000 10.003 output voltage vs. temperature (v out = 10v) max6143toc02 temperature ( c) output voltage (v) -50 25 50 -25 0 75 100 125 three typical parts 0.50 0.25 0 -0.25 -0.50 015 510 202530 load regulation vs. source current (v out = 2.5v) max6143toc03 source current (ma) output voltage change (mv) t a = -40 c t a = +125 c t a = +25 c 0.50 0.25 0 -0.25 -0.50 015 510 202530 load regulation vs. source current (v out = 10v) max6143toc04 source current (ma) output voltage change (mv) t a = +25 c t a = +125 c t a = -40 c 1.00 0.75 0.50 0.25 -0.25 0 -0.50 0 1.0 0.5 1.5 2.0 load regulation vs. sink current (v out = 2.5v) max6143toc05 sink current (ma) output voltage change (mv) t a = +25 c t a = +125 c t a = -40 c 2.0 1.5 1.0 0.5 -0.5 0 -1.0 0 1.0 0.5 1.5 2.0 load regulation vs. sink current (v out = 10v) max6143toc06 sink current (ma) output voltage change (mv) t a = -40 c t a = +125 c t a = +25 c 0 60 20 40 80 100 line regulation vs. temperature (v out = 2.5v) max6143toc07 input voltage (v) output voltage change ( v) 02025 51015 3 03540 t a = -40 c t a = +125 c t a = +25 c 0 150 50 100 200 250 300 line regulation vs. temperature (v out = 10v) max6143toc08 input voltage (v) output voltage change ( v) 12 28 32 16 20 24 36 40 t a = -40 c t a = +125 c t a = +25 c 0.5 1.5 1.0 2.0 2.5 minimum input-output differential vs. source current (v out = 2.5v) max6143toc09 source current (ma) dropout voltage (v) 01216 48 20 t a = -40 c t a = +125 c t a = +25 c t ypical operating characteristics (v in = +5v for v out = +2.5v, v in = +15v for v out = +10v, i out = 0, t a = +25?, unless otherwise noted.)
max6143 high-precision voltage reference with t emperature sensor _______________________________________________________________________________________ 9 0.5 1.5 1.0 2.0 2.5 minimum input-output differential vs. source current (v out = 10v) max6143toc10 source current (ma) dropout voltage (v) 01216 48 20 t a = -40 c t a = +125 c t a = +25 c -140 -100 -120 -60 -80 -20 -40 0 0.001 0.1 1 0.01 10 100 1000 power-supply rejection ratio vs. frequency (v out = 2.5v) max6143toc11 frequency (khz) psrr (db) -120 -100 -60 -80 -20 -40 0 0.001 0.1 1 0.01 10 100 1000 power-supply rejection ratio vs. frequency (v out = 10v) max6143toc12 frequency (khz) psrr (db) 0.001 0.1 0.01 10 1 100 0.1 1 0.01 10 100 1000 output impedance vs. frequency (v out = 2.5v) max6143toc13 frequency (khz) output impedance ( ? ) 0 100 50 200 150 250 300 350 400 01015 5202 5303540 supply current vs. input voltage (v out = 2.5v) max6143toc14 input voltage (v) supply current ( a) t a = -40 c t a = +125 c t a = +25 c 0 100 50 200 150 250 300 350 400 01015 5202 5303540 supply current vs. input voltage (v out = 10v) max6143toc15 input voltage (v) supply current ( a) t a = -40 c t a = +125 c t a = +25 c 250 300 275 325 350 -50 -25 0 25 50 75 100 125 supply current vs. temperature (v out = 2.5v) max6143toc16 temperature ( c) supply current ( a) 250 325 300 275 350 375 -50 -25 0 25 50 75 100 125 supply current vs. temperature (v out = 10v) max6143toc17 temperature ( c) supply current ( a) 0.01 1 0.1 10 100 -50 -25 0 25 50 75 100 125 shutdown supply current vs. temperature (v out = 2.5v) max6143toc18 temperature ( c) shutdown current (na) t ypical operating characteristics (continued) (v in = +5v for v out = +2.5v, v in = +15v for v out = +10v, i out = 0, t a = +25?, unless otherwise noted.)
max6143 high-precision voltage reference with t emperature sensor 10 ______________________________________________________________________________________ t ypical operating characteristics (continued) (v in = +5v for v out = +2.5v, v in = +15v for v out = +10v, i out = 0, t a = +25?, unless otherwise noted.) 0.01 1 0.1 10 100 -50 -25 0 25 50 75 100 125 shutdown supply current vs. temperature (v out = 10v) max6143toc19 temperature ( c) shutdown current (na) 400 600 500 700 800 -50 -25 0 25 50 75 100 125 temp voltage vs. temperature (v out = 2.5v) max6143toc20 temperature ( c) temp voltage (mv) 400 600 500 800 700 900 -50 -25 0 25 50 75 100 125 temp voltage vs. temperature (v out = 10v) max6143toc21 temperature ( c) temp voltage (mv) 2.35 2.50 2.45 2.40 2.60 2.55 2.65 0 0.5 1.0 1.5 2.0 2.5 output voltage vs. trim voltage (v out = 2.5v) max6143toc22 trim voltage (v) output voltage (v) 2.498 2.500 2.499 2.501 2.502 0 200 400 600 800 1000 long-term stability vs. time (v out = 2.500v) max6143toc23 time (hours) v out (v) two typical parts 9.998 10.000 9.999 10.001 10.002 0 200 400 600 800 1000 long-term stability vs. time (v out = 10.0v) max6143toc24 time (hours) v out (v) two typical parts 1000 100 output voltage-noise density vs. frequency (v out = 2.5v) max6143toc25 frequency (hz) output voltage-noise density (nv/ hz ) 0.1 100 1000 110 10,000 1000 100 output voltage-noise density vs. frequency (v out = 10v) max6143toc26 frequency (hz) output voltage-noise density (nv/ hz ) 0.1 100 1000 110 0.1hz to 10hz output noise max6143toc27 1 v/div 1s/div
max6143 high-precision voltage reference with t emperature sensor ______________________________________________________________________________________ 11 0.1hz to 10hz output noise max6143toc28 4 v/div 1s/div load transient (v out = 2.5v, c out = 0, 0 to 20ma) max6413toc29 i out v out ac-coupled 1v/div 0 20ma 10 s/div load transient (v out = 10v, c out = 0, 0 to 20ma) max6413toc30 i out v out ac-coupled 1v/div 0 20ma 10 s/div load transient (v out = 2.5v, c out = 1 f, 0 to +20ma) max6413toc31 i out v out ac-coupled 50mv/div 0 20ma 200 s/div load transient (v out = 10v, c out = 1 f, 0 to 20ma) max6413toc32 i out v out ac-coupled 100mv/div 0 20ma 100 s/div load transient (v out = 2.5v, c out = 0, 0 to -2ma) max6413toc33 i out v out ac-coupled 200mv/div 0 -2ma 40 s/div load transient (v out = 10v, c out = 0, 0 to -2ma) max6413toc34 i out v out ac-coupled 20mv/div 0 -2ma 200 s/div load transient (v out = 2.5v, c out = 1 f, 0 to -2ma) max6413toc35 i out v out ac-coupled 20mv/div 0 -2ma 400 s/div load transient (v out = 10v, c out = 1 f, 0 to -2ma) max6413toc36 i out v out ac-coupled 5mv/div 0 -2ma 400 s/div t ypical operating characteristics (continued) (v in = +5v for v out = +2.5v, v in = +15v for v out = +10v, i out = 0, t a = +25?, unless otherwise noted.)
max6143 high-precision voltage reference with t emperature sensor 12 ______________________________________________________________________________________ t ypical operating characteristics (continued) (v in = +5v for v out = +2.5v, v in = +15v for v out = +10v, i out = 0, t a = +25?, unless otherwise noted.) line transient (v out = 2.5v) max6413toc37 v in v out ac-coupled 200mv/div 5.5v 4.5v 10 s/div c out = 0 line transient (v out = 10v) max6413toc38 v in 1v/div v out ac-coupled 200mv/div 15.5v 14.5v 2 s/div turn-on transient (v out = 2.5v, c out = 0) max6413toc39 v in 2v/div v out 1v/div gnd gnd 10 s/div c out = 0 turn-on transient (v out = 2.5v, c out = 1 f) max6413toc40 v in 2v/div v out 1v/div gnd gnd 40 s/div turn-on transient (v out = 10v, c out = 0) max6413toc41 v in 5v/div v out 5v/div gnd gnd 100 s/div turn-on transient (v out = 10v, c out = 1 f) max6413toc42 v in 5v/div v out 5v/div gnd gnd 200 s/div shutdown transient (v out = 2.5v, v in = 5v, c out = 0) max6413toc43 v shdn 2v/div v out 1v/div gnd gnd 10 s/div shutdown transient (v out = 2.5v, v in = 5v, c out = 1 f) max6413toc44 v shdn 2v/div +5v v out 1v/div gnd gnd 40 s/div
detailed description the max6143 precision voltage reference provides accurate preset +2.5v, +3.3v, +4.096v, +5.0v, and +10v reference voltages from up to +40v input voltages. these devices feature a proprietary temperature-coeffi- cient curvature-correction circuit and laser-trimmed thin- film resistors that result in a very low 3ppm/ c temperature coefficient and excellent 0.05% initial accu- racy. the max6143 draws 340? of supply current and sources 30ma or sinks 2ma of load current. trimming the output voltage trim the factory-preset output voltage on the max6143 by placing a resistive-divider network between out, trim, and gnd. use the following formula to calculate the change in output voltage from its preset value: ? v out = 2 x (v trim - v trim (open) ) x k where: v trim = 0 to v out v trim (open) = v out (nominal) / 2 (typ) k = 6% typ for example, use a 50k ? potentiometer (such as the max5436) between out, trim, and gnd with the potentiometer wiper connected to trim (see figure 2). as the trim voltage changes from v out to gnd, the output voltage changes accordingly. set r2 to 1m ? or less. currents through resistors r1 and r2 add to the quiescent supply current. t ypical operating characteristics (continued) (v in = +5v for v out = +2.5v, v in = +15v for v out = +10v, i out = 0, t a = +25?, unless otherwise noted.) shutdown transient (v out = 10v, v in = 15v, c out = 0) max6413toc45 v shdn 5v/div v out 5v/div gnd gnd 100 s/div shutdown transient (v out = 10v, v in = 15v, c out = 1 f) max6143toc46 v shdn 5v/div v out 5v/div gnd gnd 100 s/div max6143 high-precision voltage reference with t emperature sensor ______________________________________________________________________________________ 13 pin name function 1, 8 i.c. internally connected. do not connect externally. 2i n positive power-supply input 3 temp temperature proportional output voltage. temp generates an output voltage proportional to the die temperature. 4 gnd ground 5 trim output voltage trim. connect trim to the center of a voltage-divider between out and gnd for trimming. leave unconnected to use the preset output voltage. 6 out output voltage 7 shdn active-low shutdown. connect shdn to in for normal operation. pin description
max6143 high-precision voltage reference with t emperature sensor 14 ______________________________________________________________________________________ temp output the max6143 provides a temperature output propor- tional to die temperature. temp can be calculated from the following formula: temp (v) = t j (?) x n where t j = the die temperature, n = the temperature multiplier, t a = the ambient temperature. self-heating affects the die temperature and converse- ly, the temp output. the temp equation assumes the output is not loaded. if device power dissipation is neg- ligible, then t j t a . applications information bypassing/output capacitance for the best line-transient performance, decouple the input with a 0.1? ceramic capacitor as shown in the typical operating circuit . place the capacitor as close to in as possible. when transient performance is less important, no capacitor is necessary. the max6143 does not require an output capacitor for stability and is stable with capacitive loads up to 100?. in applications where the load or the supply can experi- ence step changes, a larger output capacitor reduces the amount of overshoot (undershoot) and improves the circuit? transient response. place output capacitors as close to the device as possible for best performance. supply current the max6143 consumes 340? of quiescent supply current. this improved efficiency reduces power dissi- pation and extends battery life. shutdown the active-low shutdown feature reduces supply cur- rent to 0.01? (typ), further extending battery life. connect shdn to gnd to activate shutdown. connect shdn to in for normal operation. thermal hysteresis thermal hysteresis is the change in the output voltage at t a = +25 c before and after the device is cycled over its entire operating temperature range. hysteresis is caused by differential package stress appearing across the bandgap core transistors. the typical ther- mal hysteresis value is 120ppm. turn-on time the max6143 typically turns on and settles to within 0.1% of the preset output voltage in 150? (2.5v output). the turn-on time can increase up to 150? with the device operating at a 1? load. short-circuited outputs the max6143 features a short-circuit-protected output. internal circuitry limits the output current to 60ma when short circuiting the output to ground. the output cur- rent is limited to 3ma when short circuiting the output to the input. n vattt t mv k temp j ( ) ./ = = ? 0 0 19 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 1. temperature coefficient vs. operating temperature range for a 1 lsb maximum error
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 resolu- tion limit through the operating temperature range. figure 1 shows the maximum allowable reference-volt- age 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 ref- erence-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. max6143 high-precision voltage reference with t emperature sensor ______________________________________________________________________________________ 15 in out gnd *optional. * ( v out + 2v) to 40v input reference output max5436 50k ? potentiometer shdn trim temp max6143 figure 2. applications circuit using the max5436 potrntiometer chip information transistor count: 429 process: bicmos out trim gnd *internally connected. do not connect. 1 2 8 7 i.c.* shdn in temp i.c.* so top view 3 4 6 5 max6143 pin configuration
max6143 high-precision voltage reference with t emperature sensor maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) soicn .eps package outline, .150" soic 1 1 21-0041 b rev. document control no. approval proprietary information title: top view front view max 0.010 0.069 0.019 0.157 0.010 inches 0.150 0.007 e c dim 0.014 0.004 b a1 min 0.053 a 0.19 3.80 4.00 0.25 millimeters 0.10 0.35 1.35 min 0.49 0.25 max 1.75 0.050 0.016 l 0.40 1.27 0.394 0.386 d d min dim d inches max 9.80 10.00 millimeters min max 16 ac 0.337 0.344 ab 8.75 8.55 14 0.189 0.197 aa 5.00 4.80 8 n ms012 n side view h 0.244 0.228 5.80 6.20 e 0.050 bsc 1.27 bsc c h e e b a1 a d 0 -8 l 1 variations:

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