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general description the max873/MAX875/max876 precision 2.5v, 5v, and 10v references offer excellent accuracy and very low power consumption. extremely low temperature drift combined with excellent line and load regulation permit stable operation over a wide range of electrical and envi- ronmental conditions. operation for the max873 is guar- anteed with a +4.5v supply, making the part ideal in systems running from a +5v ?0% supply. low 10hz to 1khz noise?ypically 3.8? rms , 9? rms , and 18? rms , respectively, for the max873, MAX875, max876?ake the parts suitable for 12-bit data-acquisition systems. a trim pin facilitates adjustment of the reference voltage over a ?% range, using only a 100k ? potentiometer. a voltage output proportional to temperature provides a source for temperature compensation circuits, tempera- ture warning circuits, and other applications. applications 12-bit adcs and dacs digital multimeters portable data-acquisition systems low-power test equipment features ? max873/MAX875/max876 +2.5v/+5v/+10v outputs ?.5mv/?.0mv/?.0mv (max) initial accuracy ? 7ppm/? (max) temperature coefficient ? 450 a (max) quiescent current ? low noise: 3.8? p-p (typ at 2.5v) ? sources 10ma, sinks 2ma ? 15ppm/ma load regulation (max) ? 4ppm/v line regulation (max) ? wide supply voltage range, +4.5v to +18v (max873) ? temp output proportional to temperature max873/MAX875/max876 low-power, low-drift, +2.5v/+5v/+10v precision voltage references ________________________________________________________________ maxim integrated products 1 19-0038; rev 3; 6/07 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information/selector guide +2.5v (max873) +5.0v (MAX875) +10.0v (max876) *optional in v+ 0v gnd 0.1 f* out max873 MAX875 max876 typical operating circuit pin configuration appears at end of data sheet. part pin- package output voltage (v) max tempco (ppm/?) initial accuracy % pkg code max873 aesa+ 8 so 2.500 7 0.06 s8-4 max873besa+ 8 so 2.500 20 ?0.10 s8-4 MAX875 aesa+ 8 so 5.000 7 0.04 s8-4 MAX875besa+ 8 so 5.000 20 ?0.06 s8-4 max876 aesa+ 8 so 10.000 7 0.03 s8-4 max876besa+ 8 so 10.000 20 ?0.05 s8-4 + denotes a lead-free package. note: all devices are specified over the -40? to +85? operating temperature range.
max873/MAX875/max876 low-power, low-drift, +2.5v/+5v/+10v precision voltage references 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 +20v out, trim, temp, test ..............................- 0.3v to (in + 0.3v) output short-circuit duration (to gnd)....................................5s continuous power dissipation (t a = +70?) so (derate 5.88mw/? above +70?) .........................471mw operating temperature ranges: max87_ _e_a ..................................................-40? to +85? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? junction temperature (t j ) ...............................................+150? electrical characteristics?ax873 (v in = +5v, i l = 0ma, c load < 100pf, t a = -40? to +85?, unless otherwise noted.) parameter symbol conditions min typ max units max873a (0.06%) 2.4985 2.5000 2.5015 output voltage v out t a = +25? max873b (0.10%) 2.4975 2.5000 2.5025 v max873a 2 7 output-voltage drift (note 1) tcv out max873b 5 20 ppm/? 0.1hz to 10hz 3.8 ? p-p output-noise voltage e n t a = +25? 10hz to 1khz 6.8 ? rms t a = +25? 1 4.0 line regulation v in = 4.5v to 18v t a = -40? to +85? 2 6 ppm/v t a = +25? 3 15 i l = 0 to 10ma (source) t a = -40? to +85? 3 20 t a = +25? 100 900 load regulation i l = 0 to -1ma (sink) t a = -40? to +85? 150 1900 ppm/ma t a = +25? 300 450 quiescent supply current i q t a = -40? to +85? 300 600 ? short-circuit output current i sc output shorted to gnd 60 ma v out adjust range ?00 mv long-term output drift 50 ppm/kh temp pin voltage output v temp t a = +25? 570 mv temperature sensitivity tcv temp 1.9 mv/? parameter symbol conditions min typ max units MAX875a (0.04%) 4.998 5.000 5.002 output voltage v out t a = +25? MAX875b (0.06%) 4.997 5.000 5.003 v MAX875a 2 7 output voltage drift (note 1) tcv out MAX875b 5 20 ppm/? 0.1hz to 10hz 9 v p-p output-noise voltage e n t a = +25? 10hz to 1khz 14.5 ? rms t a = +25? 1 4.0 line regulation v in = 7v to 18v t a = -40? to +85? 2 6 ppm/v electrical characteristics?ax875 (v in = +15v, i l = 0ma, c load < 100pf, t a = -40? to +85?, unless otherwise noted.)
max873/MAX875/max876 low-power, low-drift, +2.5v/+5v/+10v precision voltage references _______________________________________________________________________________________ 3 electrical characteristics?ax875 (continued) (v in = +15v, i l = 0ma, c load < 100pf, t a = -40? to +85?, unless otherwise noted.) electrical characteristics?ax876 (v in = +15v, i l = 0ma, c load < 100pf, t a = -40? to +85?, unless otherwise noted.) parameter symbol conditions min typ max units max876a (0.03%) 9.997 10.000 10.003 output voltage v out t a = +25? max876b (0.05%) 9.995 10.000 10.005 v max876a 2 7 output voltage drift (note 1) tcv out max876b 5 20 ppm/? 0.1hz to 10hz 18 ? p-p output-noise voltage e n t a = +25? 10hz to 1khz 29 ? rms t a = +25? 1 4.0 line regulation v in = 12v to 18v t a = -40? to +85? 1 6 ppm/v t a = +25? 1 15 i l = 0 to 10ma (source) t a = -40? to +85? 1 20 t a = +25? 100 900 load regulation i l = 0 to -1ma (sink) t a = -40? to +85? 150 1900 ppm/ma t a = +25? 320 550 quiescent supply current i q t a = -40? to +85? 340 700 ? short-circuit output current i sc output shorted to gnd 60 ma v out adjust range ?00 mv long-term output drift 50 ppm/kh temp pin voltage output v temp t a = +25? 630 mv temperature sensitivity tcv temp 2.1 mv/? note 1: temperature coefficient is defined as maximum ? v out divided by maximum ? t of the temperature range . parameter symbol conditions min typ max units t a = +25? 3 15 i l = 0 to 10ma (source) t a = -40? to +85? 3 20 t a = +25? 100 900 load regulation i l = 0 to -1ma (sink) t a = -40? to +85? 150 1900 ppm/ma t a = +25? 320 550 quiescent supply current i q t a = -40? to +85? 320 700 ? short-circuit output current i sc output shorted to gnd 60 ma v out adjust range ?00 mv long-term output drift 50 ppm/kh temp pin voltage output v temp t a = +25? 630 mv temperature sensitivity tcv temp 2.1 mv/?
max873/MAX875/max876 low-power, low-drift, +2.5v/+5v/+10v precision voltage references 4 _______________________________________________________________________________________ typical 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.) 2.498 2.500 2.499 2.501 2.502 output voltage vs. temperature (v out = 2.5v) max873/75/76 toc01 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) max873/75/76 toc02 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) max873/75/76 toc03 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) max873/75/76 toc04 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 01.0 0.5 1.5 2.0 load regulation vs. sink current (v out = 2.5v) max873/75/76 toc05 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 01.0 0.5 1.5 2.0 load regulation vs. sink current (v out = 10v) max873/75/76 toc06 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) max873/75/76 toc07 input voltage (v) output voltage change ( v) 02025 5 1015 303540 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) max873/75/76 toc08 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) max873/75/76 toc09 source current (ma) dropout voltage (v) 01216 48 20 t a = -40 c t a = +125 c t a = +25 c
max873/MAX875/max876 low-power, low-drift, +2.5v/+5v/+10v precision voltage references _______________________________________________________________________________________ 5 typical 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.) 0.5 1.5 1.0 2.0 2.5 minimum input-output differential vs. source current (v out = 10v) max873/75/76 toc10 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) max873/75/76 toc11 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) max873/75/76 toc12 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) max873/75/76 toc13 frequency (khz) output impedance ( ? ) 0 100 50 200 150 250 300 350 400 01015 5 2025303540 supply current vs. input voltage (v out = 2.5v) max873/75/76 toc14 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 5 2025303540 supply current vs. input voltage (v out = 10v) max873/75/76 toc15 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) max873/75/76 toc16 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) max873/75/76 toc17 temperature ( c) supply current ( a) 400 600 500 700 800 -50 -25 0 25 50 75 100 125 temp voltage vs. temperature (v out = 2.5v) max873/75/76 toc18 temperature ( c) temp voltage (mv)
max873/MAX875/max876 low-power, low-drift, +2.5v/+5v/+10v precision voltage references 6 _______________________________________________________________________________________ typical 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.) 400 600 500 800 700 900 -50 -25 0 25 50 75 100 125 temp voltage vs. temperature (v out = 10v) max873/75/76 toc19 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) max873/75/76 toc20 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) max873/75/76 toc21 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) max873/75/76 toc22 time (hours) v out (v) two typical parts 1000 100 output-voltage noise density vs. frequency (v out = 2.5v) max873/75/76 toc23 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) max873/75/76 toc24 frequency (hz) output voltage-noise density (nv/ hz ) 0.1 100 1000 110 0.1hz to 10hz output noise (v out = 2.5v) max873/75/76 toc25 1 v/div 1s/div 0.1hz to 10hz output noise (v out = 10v) max873/75/76 toc26 4 v/div 1s/div
max873/MAX875/max876 low-power, low-drift, +2.5v/+5v/+10v precision voltage references _______________________________________________________________________________________ 7 typical 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.) load transient (v out = 2.5v, c out = 0, 0 to 20ma) max873/75/76 toc27 i out v out ac-coupled 1v/div 0 20ma 10 s/div load transient (v out = 10v, c out = 0, 0 to 20ma) max873/75/76 toc28 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) max873/75/76 toc29 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) max873/75/76 toc30 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) max873/75/76 toc31 i out v out ac-coupled 200mv/div 0 -2ma 40 s/div load transient (v out = 10v, c out = 0, 0 to -2ma) max873/75/76 toc32 i out v out ac-coupled 20mv/div 0 -2ma 200 s/div
max873/MAX875/max876 low-power, low-drift, +2.5v/+5v/+10v precision voltage references 8 _______________________________________________________________________________________ typical 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.) load transient (v out = 2.5v, c out = 1 f, 0 to -2ma) max873/75/76 toc33 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) max873/75/76 toc34 i out v out ac-coupled 5mv/div 0 -2ma 400 s/div line transient (v out = 2.5v) max873/75/76 toc35 v in v out ac-coupled 200mv/div 5.5v 4.5v 10 s/div c out = 0 line transient (v out = 10v) max873/75/76 toc36 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) max873/75/76 toc37 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) max873/75/76 toc38 v in 2v/div v out 1v/div gnd gnd 40 s/div
max873/MAX875/max876 low-power, low-drift, +2.5v/+5v/+10v precision voltage references _______________________________________________________________________________________ 9 detailed description the max873/MAX875/max876 precision voltage refer- ences provide accurate preset +2.5v, +5.0v, and +10v reference voltages from up to +40v input voltages. these devices feature 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 0.05% initial accuracy. the max873/MAX875/max876 draw 340? of supply current and source 30ma or sink 2ma of load current. trimming the output voltage trim the factory-preset output voltage on the max873/MAX875/max876 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 = 0v 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. typical 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.) turn-on transient (v out = 10v, c out = 0) max873/75/76 toc39 v in 5v/div v out 5v/div gnd gnd 100 s/div turn-on transient (v out = 10v, c out = 1 f) max873/75/76 toc40 v in 5v/div v out 5v/div gnd gnd 200 s/div pin name function 1, 8 i.c. internally connected. do not connect externally. 2 in 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 n.c. no connection. not internally connected. pin description
max873/MAX875/max876 low-power, low-drift, +2.5v/+5v/+10v precision voltage references 10 ______________________________________________________________________________________ temp output the max873/MAX875/max876 provide a temperature output proportional to die temperature. temp can be cal- culated 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 conversely, the temp output. the temp equation assumes the output is not loaded. if device power dissipation is negligible, 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 max873/MAX875/max876 do not require an output capacitor for stability and are stable with capacitive loads up to 100?. in applications where the load or the supply can experience step changes, a larger output capacitor reduces the amount of overshoot (under- shoot) and improves the circuit? transient response. place output capacitors as close to the devices as pos- sible for best performance. supply current the max873/MAX875/max876 consume 320? (typ) of quiescent supply current. this improved efficiency reduces power dissipation and extends battery life. 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 max873/MAX875/max876 typically turn on and settle 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 with a 1? load. short-circuited outputs the max873/MAX875/max876 feature a short-circuit-pro- tected output. internal circuitry limits the output current to 60ma when short circuiting the output to ground. the output current is limited to 3ma when short circuit- ing 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
max873/MAX875/max876 low-power, low-drift, +2.5v/+5v/+10v precision voltage references ______________________________________________________________________________________ 11 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. in out gnd *optional. * ( v out + 2v) to 40v input reference output max5436 50k ? potentiometer trim temp max873 MAX875 max876 figure 2. applications circuit using the max5436 potentiometer chip information transistor count: 429 process: bicmos out trim gnd *internally connected. do not connect. 1 2 8 7 i.c.* n.c. in temp i.c.* so top view 3 4 6 5 max873 MAX875 max876 pin configuration
max873/MAX875/max876 low-power, low-drift, +2.5v/+5v/+10v precision voltage references 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. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline 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: revision history pages changed at rev 3: 1?2

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