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general description the max6225/max6241/max6250 are low-noise, preci- sion voltage references with extremely low 1ppm/? temperature coefficients and excellent ?.02% initial accuracy. these devices feature buried-zener technolo- gy for lowest noise performance. load-regulation speci- fications are guaranteed for source and sink currents up to 15ma. excellent line and load regulation and low output impedance at high frequency make them ideal for high-resolution data-conversion systems up to 16 bits. the max6225 is set for 2.500v output, the max6241 is set for 4.096v output, and the max6250 is set for 5.000v output. all three provide for the option of exter- nal trimming and noise reduction. applications high-resolution analog-to-digital and digital-to-analog converters high-accuracy reference standard high-accuracy industrial and process control digital voltmeters ate equipment precision current sources features low 1.0ppm/? temperature coefficient very low 1.5vp-p noise (0.1hz to 10hz) 0.02% initial accuracy 15ma output source and sink current low, 18mw power consumption (max6225) industry-standard pinout optional noise reduction and voltage trim excellent transient response 8-pin so package available low 20ppm/1000hr long-term stability stable for all capacitive loads max6225/max6241/max6250 low-noise, precision, +2.5v/+4.096v/+5v voltage references ________________________________________________________________ maxim integrated products 1 reference out gnd nr *optional trim out in 8v to 36v input * 2.2 f * 2.2 f max6225 max6241 max6250 typical operating circuit out nr trim gnd 1 2 8 7 i.c. i.c. in i.c. max6225 max6241 max6250 dip/so top view i.c. = internally connected; do not use 3 4 6 5 pin configuration 19-1139; rev 4; 1/01 ordering information ordering information continued at end of data sheet. max6225bcsa max6225 acpa max6225bcpa max6225acsa 0 c to +70 c 0 c to +70 c 0 c to +70 c 0 c to +70 c 5.0 2.0 5.0 2.0 8 so 8 plastic dip 8 plastic dip 8 so max6225aepa -40 c to +85 c 3.0 8 plastic dip part temp. range max tempco (ppm/ c) pin- package max6225bepa -40 c to +85 c 7.0 8 plastic dip max6225aesa -40 c to +85 c 3.0 8 so max6225besa -40 c to +85 c 7.0 8 so max6225amja -55 c to +125 c 5.0 8 cerdip max6225bmja -55 c to +125 c 8.0 8 cerdip 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.
max6225/max6241/max6250 low-noise, precision, +2.5v/+4.096v/+5v voltage references 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics max6225 (v in = +10v, i out = 0ma, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c.) 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. (voltages referenced to gnd) in..............................................................................-0.3v to +40v out, trim ...............................................................-0.3v to +12v nr ..............................................................................-0.3v to +6v out short-circuit to gnd duration (v in 12v)..........continuous out short-circuit to gnd duration (v in 40v) ........................5s out short-circuit to in duration (v in 12v) ..............continuous continuous power dissipation (t a = +70 c) 8-pin plastic dip (derate 9.09mw/ c above +70 c) ......727mw 8-pin so (derate 5.88mw/ c above +70 c) ...................471mw 8-pin cerdip (derate 8.00mw/ c above +70 c) ...........640mw operating temperature ranges max62_ _ _c_ a .....................................................0 c to +70 c max62_ _ _e_ a ..................................................-40 c to +85 c max62_ _ _mja ................................................-55 c to +125 c storage temperature range ..............................-65 c to +150 c lead temperature (soldering, 10s)...................................+300 c v 836 v in input voltage range units min typ max symbol parameter c, e, m t a v 2.499 2.500 2.501 v out output voltage c 1.0 2.0 output voltage temperature coefficient (note 1) tcv out e 1.5 3.0 ppm/ c line regulation (note 2) ? v out / ? v in +25 c 10 18 ppm/v max6225a max6225ac_a max6225ae_a conditions 8v v in 10v 2.497 2.500 2.503 max6225b m 2.0 5.0 c 2.5 5.0 max6225amja max6225bc_a e 2.5 7.0 m 2.5 8.0 max6225be_a max6225bmja c 30 e 35 m 45 10v v in 36v +25 c 25 c 7 e 8 m 10 +25 c +25 c
sinking: -15ma i out 0ma max6225/max6241/max6250 low-noise, precision, +2.5v/+4.096v/+5v voltage references _______________________________________________________________________________________ 3 electrical characteristics max6225 (continued) (v in = +10v, i out = 0ma, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c.) (note 4) 20 ppm temperature hysteresis +25 c conditions c 16 e long-term stability ? v out / t 17 +25 c 20 m 315 ppm/ 1000hr c 16 figure 1 0.1hz f 10hz e 10hz f 1khz 17 m 10 30 +25 c 1.8 2.7 supply current i in c, e, m 3.0 ma trim-adjustment range units min typ max symbol parameter ? v out c, e, m 15 25 mv 1.5 v p-p output noise voltage (note 3) e n +25 c 1.3 2.8 v rms t a to 0.01% of final value turn-on settling time t on +25 c 5 s +25 c sourcing: 0ma i out 15ma ppm/ma ? v out / ? i out load regulation (note 2) sinking: -15ma i out 0ma
ppm/ma max6225/max6241/max6250 low-noise, precision, +2.5v/+4.096v/+5v voltage references 4 _______________________________________________________________________________________ (note 4) v 4.095 4.096 4.097 v out output voltage +25 c 20 ppm temperature hysteresis c 1.0 2.0 max6241a output voltage temperature coefficient (note 1) tcv out e 1.5 3.0 ppm/ c +25 c +25 c 10 18 max6241ac_a max6241ae_a conditions 20 ppm/ 1000hr 8v v in 10v long-term stability ? v out / t +25 c line regulation (note 2) ? v out / ? v in ppm/v figure 1 0.1hz f 10hz 10hz f 1khz v 836 v in input voltage range +25 c 1.9 2.9 i in c, e, m 3.2 ma trim-adjustment range units min typ max symbol parameter ? v out c, e, m 24 40 mv 2.4 vp-p output noise voltage (note 3) e n +25 c 2.0 4.0 v rms c, e, m t a electrical characteristics max6241 (v in = +10v, i out = 0ma, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c.) m 2.0 5.0 c 2.5 5.0 max6241amja max6241bc_a e 2.5 7.0 m 2.5 8.0 max6241be_a max6241bmja 4.092 4.096 4.100 max6241b to 0.01% of final value turn-on settling time t on +25 c 8 s c 30 e 35 m 45 +25 c 25 10v v in 36v c 7 e 8 m 10 supply current c 16 e 17 m 39 c 16 e 17 m 718 +25 c +25 c sourcing: 0ma i out 15ma sinking: -15ma i out 0ma ? v out / ? i out load regulation (note 2) ppm/ma
max6225/max6241/max6250 low-noise, precision, +2.5v/+4.096v/+5v voltage references _______________________________________________________________________________________ 5 electrical characteristics max6250 (v in = +10v, i out = 0ma, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c.) (note 4) v 4.999 5.000 5.001 v out output voltage +25 c 20 ppm temperature hysteresis c 1.0 2.0 max6250a e 1.5 3.0 +25 c +25 c 10 18 max6250ac_a max6250ae_a conditions 20 ppm/ 1000hr 8v v in 10v long-term stability ? v out / t +25 c line regulation (note 2) ? v out / ? v in ppm/v figure 1 to 0.01% of final value v 836 v in input voltage range +25 c 2.0 3.0 supply current i in c, e, m 3.3 ma trim-adjustment range units min typ max symbol parameter ? v out c, e, m 30 50 mv 10 s turn-on settling time t on +25 c c, e, m t a c 30 e 35 m 45 c 7 +25 c 25 e 8 10v v in 36v m 10 c 16 c 16 e 17 e 17 m m 29 615 0.1hz f 10hz 10hz f 1khz 3.0 vp-p output noise voltage (note 3) e n +25 c 2.5 5.0 v rms 4.995 5.000 5.005 max6250b output voltage temperature coefficient (note 1) tcv out ppm/ c m 2.0 5.0 max6250amja c 2.5 5.0 max6250bc_a e 2.5 7.0 max6250be_a m 2.5 8.0 max6250bmja note 1: temperature coefficient is measured by the box method; i.e., the maximum ? v out is divided by ? t x v out . note 2: line regulation ( ? v out / (v out x ? v in )) and load regulation ( ? v out / (v out x ? i out )) are measured with pulses and do not include output voltage changes due to die-temperature changes. note 3: noise specifications are guaranteed by design. note 4: temperature hysteresis is specified at t a = +25 c by measuring v out before and after changing temperature by +25 c using the pdip package. +25 c +25 c sourcing: 0ma i out 15ma sinking: -15ma i out 0ma ppm/ma ? v out / ? i out load regulation (note 2)
max6225/max6241/max6250 low-noise, precision, +2.5v/+4.096v/+5v voltage references 6 _______________________________________________________________________________________ __________________________________________typical operating characteristics (v in = +10v, i out = 0ma, t a = +25 c, unless otherwise noted.) 2.0 -1.5 -55 -15 65 max6250 normalized output voltage vs. temperature -1.0 1.0 max6225 toc 01 temperature ( c) ? v out (mv) ? v out (ppm) 25 105 -35 5 85 45 125 0.5 0 -0.5 1.5 400 -300 -200 200 100 0 -100 300 -20 -10 0 10 20 30 40 50 60 0 5 10 15 20 25 30 35 40 change in output voltage vs. input voltage v in (v) ? v out (ppm) max6225 toc 07 -55 -15 65 max6241 normalized output voltage vs. temperature -1 1.0 max6225 toc 02 temperature ( c) ? v out (mv) ? v out (ppm) 25 105 -35 5 85 45 125 0.5 0 -0.5 1.5 -250 -125 0 125 250 375 -0.4 -0.3 -0.2 -0.1 00 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -160 -120 -80 -40 40 80 120 160 200 240 280 -55 -15 65 max6225 normalized output voltage vs. temperature max6225 toc 03 temperature ( c) ? v out (mv) ? v out (ppm) 25 105 -35 5 85 45 125 -250 -200 -150 -100 -50 0 50 100 150 200 -40 -30 -20 -10 0 10 20 30 40 max6225 change in output voltage vs. output current i out (ma) ? v out ( v) t a = +85 c t a = -40 c t a = +25 c max6225 toc 06 -300 -200 -100 0 100 200 300 -40 -30 -20 -10 0 10 20 30 40 max6241 change in output voltage vs. output current max6225 toc 05 i out (ma) ? v out ( v) t a = +25 c t a = -40 c t a = +85 c -400 -300 -200 -100 0 100 200 300 -40 -30 -20 -10 0 10 20 30 40 max6250 change in output voltage vs. output current max6225 toc 04 i out (ma) ? v out ( v) t a = +25 c t a = -40 c t a = +85 c 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 0 5 10 15 20 25 30 35 40 supply current vs. supply voltage supply voltage (v) supply current (ma) max6225 max6241 max6250 max6225 toc08 1.0 1.5 2.0 2.5 3.0 3.5 -55 -35 -15 5 25 45 65 85 105 125 supply current vs. temperature temperature ( c) supply current (ma) max6241 max6250 max6225 max6225 toc09
max6225/max6241/max6250 low-noise, precision, +2.5v/+4.096v/+5v voltage references _______________________________________________________________________________________ 7 max6241 0.1hz to 10hz noise v out , 1 v/div 1sec/div c out = c nr = 0 f max6225 toc14 0 5 10 15 20 25 30 35 40 45 50 10 100 1k 10k max6225 output noise-voltage density vs. frequency frequency (hz) c nr = 0 f c nr = 1 f output noise density (nv/ hz) max6225 toc10 max6225 0.1hz to 10hz noise max6225 toc13 v out , 0.5 v/div 1sec/div c out = c nr = 0 f 0 10 20 30 40 50 60 70 80 90 10 100 1k 10k max6241 output noise-voltage density vs. frequency frequency (hz) max6225 toc11 c nr = 0 f c nr = 1 f output noise density (nv/ hz) 0 10 20 30 40 50 60 70 80 100 90 10 100 1k 10k max6250 output noise-voltage density vs. frequency frequency (hz) c nr = 0 f c nr = 1 f output noise density (nv/ hz) max6225 toc12 max6250 0.1hz to 10hz noise v out , 1 v/div 1sec/div c out = c nr = 0 f max6225 toc15 10 1m 10k frequency (hz) 100 1k 100k 100 0.01 output impedance vs. frequency 0.1 output impedance ( ? ) 1 10 i sink = 5ma i source = 5ma max6225 toc16 60 70 80 90 100 110 120 10 100 1k 10k ripple rejection vs. frequency (c nr = 1 f) frequency (hz) ripple rejection (db) max6241 max6225 max6250 max6225 toc17 60 65 70 75 80 85 90 95 10 100 1k 10k ripple rejection vs. frequency (c nr = 0 f) max6607/08 toc18 frequency (hz) ripple rejection (db) max6225 max6241 max6250 ____________________________typical operating characteristics (continued) (v in = 10v, i out = 0ma, t a = +25 c, unless otherwise noted.)
max6225/max6241/max6250 low-noise, precision, +2.5v/+4.096v/+5v voltage references 8 _______________________________________________________________________________________ 2 s/div load-transient response (sourcing) b a a: i out , 10ma/div (sourcing) b: v out , 500 v/div 0ma -10ma max6225 toc19 2 s/div load-transient response (sinking) b a 0ma 10ma a: i out , 10ma/div (sinking) b: v out , 500 v/div max6225 toc20 ____________________________typical operating characteristics (continued) (v in = 10v, i out = 0ma , t a = +25 c , unless otherwise noted.) 1 s/div load-transient response b a a: i out ( 10ma source and sink), 20ma/div, ac coupled b: v out , 20mv/div, ac coupled +10ma -10ma v in = 10v c out = c nr = 0 f max6225 toc21 1 s/div max6241 turn-on and turn-off transient response b a a: v in , 10v/div b: v out , 1v/div +10v 0 c in = c out = c nr = 0 f max6225 toc23 1 s/div max6225 turn-on and turn-off transient response b a a: v in , 10v/div b: v out , 1v/div +10v 0 c in = c out = c nr = 0 f max6225 toc22 1 s/div max6250 turn-on and turn-off transient response b a a: v in , 10v/div b: v out , 1v/div +10v 0 c in = c out = c nr = 0 f max6225 toc24
max6225/max6241/max6250 low-noise, precision, +2.5v/+4.096v/+5v voltage references _______________________________________________________________________________________ 9 detailed description temperature stability the max6225/max6241/max6250 are highly stable, low-noise voltage references that use a low-power tem- perature-compensation scheme to achieve laboratory- standard temperature stability. this produces a nearly flat temperature curve, yet does not require the power associated with heated references. the output voltage can be trimmed a minimum of 0.6% by connecting a 10k ? potentiometer between out and gnd, and connecting its tap to the trim pin, as shown in figure 1. the external trimming does not affect tem- perature stability. noise reduction to augment wideband noise reduction, add a 1f capacitor to the nr pin (figure 2). larger values do not improve noise appreciably ( see typical operating characteristics ). noise in the power-supply input can affect output noise, but can be reduced by adding an optional bypass capacitor to the in pin and gnd. bypassing the max6225/max6241/max6250 are stable with capacitive load values from 0f to 100f, for all values of load current. adding an output bypass capacitor can help reduce noise and output glitching caused by load transients. applications information negative regulator figure 3 shows how both a +5v and -5v precision ref- erence can be obtained from a single unregulated +5v supply. a max865 generates approximately 9v to operate the max6250 reference and max432 inverting amplifier. the +5v is inverted by the max432 chopper- stabilized amplifier. resistor r1 is optional, and may be used to trim the 5v references. r2 and r4 should be matched, both in absolute resistance and temperature coefficient. r3 is optional, and is adjusted to set the -5v reference. _____________________pin description name function 1, 7, 8 i.c. internally connected. do not use . 2 in positive power-supply input pin 4 gnd ground 3 nr noise reduction. optional capacitor connection for wideband noise reduction. leave open if not used (figure 2). 6 out voltage reference output 5 trim external trim input. allows 1% output adjustment (figure 1). leave open if not used. max6225 max6241 max6250 in 8v to 36v input reference out out trim 10k nr gnd max6225 max6241 max6250 in 8v to 36v input reference out out trim nr *optional * 1 f gnd figure 1. output voltage adjustment figure 2. noise-reduction capacitor
max6225/max6241/max6250 low-noise, precision, +2.5v/+4.096v/+5v voltage references 10 ______________________________________________________________________________________ max6250 max865 in v cc v+ v- gnd c2- c2+ c1- c1+ +5v input +reference out -reference out out trim r1 10k ? r4 100k ? r2 100k ? r3 1k ? nr 2.2 f c1 3.3 f 3.3 f 2.2 f c2 1 f 2.2 f c3 1 f c4 gnd max432 figure 3. +5v and -5v references from a single +5v supply ordering information (continued) ___________________chip information transistor count: 435 max6241bcsa max6241 acpa max6241bcpa max6241acsa 0 c to +70 c 0 c to +70 c 0 c to +70 c 0 c to +70 c 5.0 2.0 5.0 2.0 8 so 8 plastic dip 8 plastic dip 8 so max6241aepa -40 c to +85 c 3.0 8 plastic dip part temp. range max tempco (ppm/ c) pin- package max6250bepa -40 c to +85 c 7.0 8 plastic dip max6250aesa -40 c to +85 c 3.0 8 so max6250besa -40 c to +85 c 7.0 8 so max6250amja -55 c to +125 c 5.0 8 cerdip max6241bepa -40 c to +85 c 7.0 8 plastic dip max6241aesa -40 c to +85 c 3.0 8 so max6241besa -40 c to +85 c 7.0 8 so max6241amja -55 c to +125 c 5.0 8 cerdip max6241bmja -55 c to +125 c 8.0 8 cerdip max6250 acpa 0 c to +70 c 2.0 8 plastic dip max6250bcpa 0 c to +70 c 5.0 8 plastic dip max6250acsa 0 c to +70 c 2.0 8 so max6250bcsa 0 c to +70 c 5.0 8 so max6250bmja -55 c to +125 c 8.0 8 cerdip max6250aepa -40 c to +85 c 3.0 8 plastic dip
max6225/max6241/max6250 low-noise, precision, +2.5v/+4.096v/+5v voltage references ______________________________________________________________________________________ 11 ________________________________________________________package information pdipn.eps soicn.eps
max6225/max6241/max6250 low-noise, precision, +2.5v/+4.096v/+5v voltage references cdips.eps ___________________________________________package information (continued) 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 ? 2001 maxim integrated products printed usa is a registered trademark of maxim integrated products.

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