1 ? fn8140.1 caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | intersil (and design) is a registered trademark of intersil americas inc. copyright intersil americas inc. 2005, 2006. all rights reserved all other trademarks mentioned are the property of their respective owners. x60008b-25, x60008c-25, x60008d-25 precision 2.5v fga? voltage reference features ? output voltage: 2.500v ? absolute initial a ccuracy options: 0.5mv & 1.0mv ? ultra low power supply current: 500na ? low temperature coefficient options: 3, 5 & 10ppm/c ? 10ma source & sink current capability ? 10ppm/1000hrs long term stability ? supply voltage range: 4.5v to 6.5v ? 5kv esd (human body model) ? standard package: 8 ld soic ? temp range: -40c to +85c ? pb-free plus anneal available (rohs compliant) description the x60008-25 fga? voltage references are very high precision analog voltage references fabricated in intersil?s proprietary f loating g ate a nalog technology, which achieves superior levels of performance when compared to conventional band gap, buried zener, or x fet ? technologies. fga? voltage references feature very high initial accuracy, very low temperature coefficient, excellent long term stability, low noise and excellent line and load regulation, at the lowest power consumption currently available. these voltage references enable advanced applications fo r precision industrial & portable systems operatin g at significantly higher accuracy and lower power levels than can be achieved with conventional technologies. applications ? high resolution a/ds & d/as ? precision current sources ? smart sensors ? digital meters ? precision regul ators ? strain gage bridges ? calibration systems ? precision oscillators ? threshold detectors ? v-f converters ? battery management systems ? servo systems typical application v in = +5.0v 0.1f serial bus v in v out gnd x60008-25 enable sck sdat a/d converter 16 to 24-bit ref in 10f 0.001f ( * ) ( * ) also see figure 3 in applications information data sheet may 24, 2006
2 fn8140.1 may 24, 2006 package diagram pin configurations pin name description gnd ground connection v in power supply input connection v out voltage reference output connection dnc do not connect; internal connection ? must be left floating 1 2 3 4 8 7 6 5 soic v in dnc gnd x60008-xx dnc dnc v out dnc gnd ordering information part number part marking v out (v) grade temperature range (c) package pkg. dwg. # x60008bis8-25* x60008b i25 2.5 0.5mv, 3ppm/c -40 to +85 8 ld soic (150 mil) mdp0027 X60008BIS8Z-25* (note) x60008b zi25 2.5 0.5mv, 3ppm/c -40 to +85 8 ld soic (150 mil) (pb-free) mdp0027 x60008cis8-25 x60008c i25 2.5 0.5mv, 5ppm/c -40 to +85 8 ld soic (150 mil) mdp0027 x60008cis8z-25* (note) x60008c zi25 2.5 0.5mv, 5ppm/c -40 to +85 8 ld soic (150 mil) (pb-free) mdp0027 x60008dis8-25* x60008d i25 2.5 1.0mv, 10ppm/c -40 to +85 8 ld soic (150 mil) mdp0027 x60008dis8z-25* (note) x60008d zi25 2.5 1.0mv, 10ppm/c -40 to +85 8 ld soic (150 mil) (pb-free) mdp0027 *add "t1" suffix for tape and reel. note: intersil pb-free plus anneal products employ special pb-free material sets; mo lding compounds/die attach materials and 100 % matte tin plate termination finish, which are rohs compliant and compatible with both snpb and pb-free soldering operations. intersil pb-free p roducts are msl classified at pb-free peak reflow temper atures that meet or exceed the pb-free requirements of ipc/jedec j std-020. x60008b-25
3 fn8140.1 may 24, 2006 absolute maximum ratings storage temperature range..................-65c to +125c max voltage applied v in to gnd ............... -0.5v to +6.5v max voltage applied v out to gnd (*) ........ -0.5v to +3.5v voltage on ?dnc? pins......... no connections permitted to these pins. lead temperature, soldering (*) ...........................+ 225c (*) note: maximum duration = 10 seconds recommended operating conditions comment absolute maximum ratings are limits which may result in impaired reliability and/or permanent damage to the device. these are stress ra tings provided for informa- tion only and functional operation of the device at these or any other conditio ns beyond those indicated in the operational sections of this specification are not implied. for guaranteed specifications and test conditions, see electrical ch aracteristics. the guaranteed specifications apply only for the test conditions listed. some performance characteristics may degrade when the device is not operated under the listed test conditions. electrical characteristics (operating conditions: v in = 5.0v, i out = 0ma, c out = 0.001f, t a = -40 to +85c unless otherwise specified.) note: 1. over the specified temperature range. temperature coeffi cient is measured by the box method whereby the change in v out is divided by the temperature range; in this case, -40c to +85c = 125c. 2. thermal hysteresis is the change in v out created by package stress @ t a = 25c after temperature cycling. v out is read initially at t a = 25c; the x60008 is then cycled between hot (85c) and cold (-40c) before a second v out measurement is taken at 25c. the deviation between the initial v out reading and the second v out reading is then expressed in ppm. 3. guaranteed by device characterization and/or correlation to other device tests. temperature min. max. industrial -40c +85c symbol parameter conditions min typ max units v out output voltage 2.500 v v oa v out accuracy x60008b-25 x60008c-25 x60008d-25 t a = 25c -0.50 -0.50 -1.00 +0.50 +0.50 +1.00 mv i in supply current 500 800 na v in input voltage range 4.5 6.5 v tc v out output voltage temperature coefficient (1) x60008b-25 x60008c-25 x60008d-25 3 5 10 ppm/ c v out / v in line regulation +4.5v v in +6.5v 100 v/v v out / i out load regulation 0ma i source 10ma -10ma i sink 0ma 10 20 40 80 v/ma v out / t long term stability t a = 25c 10 ppm/ 1000hrs v out / t a thermal hysteresis (2) t = -40 c to +85 c 50 ppm i sc short circuit current (3) t a = 25c 50 80 ma v n output voltage noise 0.1hz to 10hz 30 v pp x60008b-25
4 fn8140.1 may 24, 2006 typical performance characteristic curves (v in = 5.0v, i out = 0ma, t a = 25c unless otherwise specified) line regulation line regulation load regulation -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -20 -15 -10 -5 0 5 10 15 20 sinking temperature ( c) sourcing i out (ma) 0.1hz to 10hz v out noise 1 sec/div 10 v/div band pass filter with 1 zero at .1hz and 2 poles at 10 hz delta v o ( v) delta v out (mv) v out (v) (normailized to v in = 5.00v) v out (v) (normailized to 2.5v at v in = 5v) v in (v) v in (v) +25 c -40 c +85 c 2.498 2.499 2.5 2.501 2.502 -40 -15 10 35 60 85 320na 520na 690na v out vs temperature normalized to 25 c -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 1 10 100 1000 10000 100000 1000000 no load 1nf load 10nf load 100nf load frequency (hz) psrr vs cap load psrr (db) 4.5 5 5.5 6 6.5 -40 c +25 c +85 c 4.5 5 5.5 6 6.5 310na 520na 690na -100 -80 -60 -40 -20 0 20 40 60 80 2.49994 2.49996 2.49998 2.5 2.50002 2.50004 2.50006 2.50008 x60008b-25
5 fn8140.1 may 24, 2006 typical performance characteristic curves (v in = 5.0v, i out = 0ma, t a = 25c unless otherwise specified) 10ma load transient response 500mv/div c l = .001 f in = -10ma i i i i in = +10ma 1ms/div 50 a load transient response 100mv/div 500 sec/div c l = .001 f in = -50 a in = +50 a line transient response line transient response 200mv/div 500 sec/div 200mv/div 500 sec/div c l = 0 c l = .001 f v in = -500mv v in = +500mv v in = -500mv v in = +500mv x60008b-25
6 fn8140.1 may 24, 2006 typical performance characteristic curves (v in = 5.0v, i out = 0ma, t a = 25c unless otherwise specified) 0 50 100 150 200 250 300 100 100 10 1000 10000 100000 no load 1nf load 10nf load 100nf load 0 1 2 3 4 5 6 -11357911 v in v out z out vs frequency frequency (hz) z out ( ) i in (na) v in (v) i in vs v in i in (na) v in (v) i in vs v in turn-on time v in & v out (v) time (msec) 0 100 200 300 400 500 600 700 800 4.5 5 5.5 6 6.5 3 units representative of i in range 480 500 520 540 560 580 600 4.5 5 5.5 6 6.5 -40? +25? +85? x60008b-25
7 fn8140.1 may 24, 2006 applications information fga technology the x60008 series of voltage references use the float- ing gate technology to create references with very low drift and supply current. essentially the charge stored on a floating gate cell is set precisely in manufacturing. the reference voltage output itself is a buffered ver- sion of the floating gate voltage. the resulting refer- ence device has excellent characteristics which are unique in the industry: very low temperature drift, high initial accuracy, and almost zero supply current. also, the reference voltage itself is not limited by voltage bandgaps or zener settings, so a wide range of refer- ence voltages can be programmed (standard voltage settings are provided, but customer-specific voltages are available). the process used for these reference devices is a floating gate cmos process, and the amplifier circuitry uses cmos transistors for amplifier and output tran- sistor circuitry. while pr oviding excellent accuracy, there are limitations in output noise level and load reg- ulation due to the mos devi ce characteristics. these limitations are addressed with circuit techniques dis- cussed in other sections. nanopower operation reference devices achiev e their highest accuracy when powered up continuously , and after initial stabili- zation has taken place. this drift can be eliminated by leaving the power-on continuously. the x60008 is the first high precision voltage reference with ultra low power consumpt ion that makes it possible to leave power-on continuous ly in battery operated cir- cuits. the x60008 consumes extremely low supply cur- rent due to the proprietary fga technology. supply current at room temperature is typically 500na which is 1 to 2 orders of magnitude lower than competitive devices. application circuits using battery power will benefit greatly from having an accurate, stable refer- ence which essentially present s no load to the battery. in particular, battery powered data converter circuits that would normally require the entire circuit to be dis- abled when not in use can remain powered up between conversions as shown in figure 1. data acqui- sition circuits providing 12 to 24 bits of accuracy can operate with the reference de vice continuously biased with no power penalty, providing the highest accuracy and lowest possible long term drift. other reference devices consuming higher supply cur- rents will need to be disabl ed in between conversions to conserve battery capaci ty. absolute accuracy will suffer as the device is biased and requires time to set- tle to its final value, or, may not actually settle to a final value as power-on time may be short. figure 1. board mounting considerations for applications requiring the highest accuracy, board mounting location should be reviewed. placing the device in areas subject to slight twisting can cause degradation of the accuracy of the reference voltage due to die stresses. it is normally best to place the device near the edge of a board, or the shortest side, as the axis of bending is mo st limited at that location. obviously mounting the device on flexprint or extremely thin pc material will likewise cause loss of reference accuracy. noise performance and reduction: the output noise voltage in a 0.1hz to 10hz bandwidth is typically 30vp -p. this is shown in the plot in the typical performance curves. the noise measurement is made with a bandpass filter made of a 1 pole high-pass filter with a corner frequency at .1hz and a 2-pole low-pass filter with a corner frequency at 12.6hz to create a filter with a 9.9hz bandwidth. noise in the 10khz to 1mhz bandwidth is approximately 400vp-p with no capacitance on the output, as shown in fig. 2 below. these noise measurements are made with a 2 decade bandpass filter made of a 1 pole high-pass filter with a corner frequency at 1/10 of the center frequency and 1-pole low-pass filter with a corner frequency at 10 times the center frequency. figure 2 also shows the noise in the 10khz to 1mhz band can be reduced to about 50vp- p using a .001f capacitor on the output. noise in the 1khz to 100khz band can be further reduced using a 0.1f capacitor on the output, but noise in the 1hz to 100hz band increases due to instability of the very low power amplifier with a 0.1f capacitance load. for v in = 4.5v to 6.5v 0.001f serial bus v in v out gnd x60008-25 ref in enable sck sdat a/d converter 12 to 24-bit 0.01f 10f x60008b-25
8 fn8140.1 may 24, 2006 load capacitances above .001f the noise reduction network shown in fig. 3 is recommended. this network reduces noise sig-nificantly over the full bandwidth. as shown in fig. 2, noise is reduced to less than 40vp-p from 1hz to 1mhz using th is network with a .01f capacitor and a 2k resistor in series with a 10f capacitor. figure 2. figure 3. turn-on time the x60008 devices have ultra-low supply current and thus the time to bias up inte rnal circuitry to final values will be longer than with high er power references. nor- mal turn-on time is typically 7ms. this is shown in the graph, figure 4. since devices can vary in supply cur- rent down to 300na, turn-on time can last up to about 12ms. care should be taken in system design to include this delay before measurements or conver- sions are started. figure 4. temperature coefficient the limits stated for temper ature coefficient (tempco) are governed by the method of measurement. the overwhelming standard for specifying the temperature drift of a reference is to measure the reference voltage at two temperatures, take the total variation, (v high - v low ), and divide by the temperature extremes of measurement (t high - t low ). the result is divided by the nominal reference voltage (at t = 25c) and multi- plied by 10 6 to yield ppm/c. this is the ?box? method. cl = 0 cl = .001f cl = .1f cl = .01f & 10f + 2k 400 350 300 250 200 150 100 50 0 1 10 100 1000 10000 100000 x60008-25 noise reduction noise voltage (vp-p) v in = 6.5v v in v o gnd x60008-25 .01f 10f 2k .1f 10f 0 1 2 3 4 5 6 -1 1 3 5 7 9 690 na 520 na 320 na v in v out x60008 turn-on time (25 c) time (msec) v in & v out (v) x60008b-25
9 fn8140.1 may 24, 2006 typical application circuits precision 2.5v, 50ma reference. v in = 5.2v to 6.5v 2n2905 2.5v/50ma 0.009f v in v out gnd x60008-25 kelvin sensed load 0.1f 5.0v v in v out gnd x60008-25 v out sense load r = 200 + ? v in v out x60008-25 gnd 4.5v to 6.5v 0.1f 0.01f v out + ? v cc r h r l x9119 v ss sda scl 2-wire bus v out (buffered) 2.5v full scale low-drift 10-bit adjustable voltage source x60008b-25
10 all intersil u.s. products are manufactured, asse mbled and tested utilizing iso9000 quality systems. intersil corporation?s quality certifications ca n be viewed at www.intersil.com/design/quality intersil products are sold by description only. intersil corpor ation reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnishe d by intersil is believed to be accurate and reliable. however, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of paten ts or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of intersil or its subsidiari es. for information regarding intersil corporation and its products, see www.intersil.com fn8140.1 may 24, 2006 x60008b-25 small outline package family (so) gauge plane a2 a1 l l1 detail x 4 4 seating plane e h b c 0.010 b m ca 0.004 c 0.010 b m ca b d (n/2) 1 e1 e n n (n/2)+1 a pin #1 i.d. mark h x 45 a see detail ?x? c 0.010 mdp0027 small outline package family (so) symbol so-8 so-14 so16 (0.150?) so16 (0.300?) (sol-16) so20 (sol-20) so24 (sol-24) so28 (sol-28) tolerance notes a 0.068 0.068 0.068 0.104 0.104 0.104 0.104 max - a1 0.006 0.006 0.006 0.007 0.007 0.007 0.007 0.003 - a2 0.057 0.057 0.057 0.092 0.092 0.092 0.092 0.002 - b 0.017 0.017 0.017 0.017 0.017 0.017 0.017 0.003 - c 0.009 0.009 0.009 0.011 0.011 0.011 0.011 0.001 - d 0.193 0.341 0.390 0.406 0.504 0.606 0.704 0.004 1, 3 e 0.236 0.236 0.236 0.406 0.406 0.406 0.406 0.008 - e1 0.154 0.154 0.154 0.295 0.295 0.295 0.295 0.004 2, 3 e 0.050 0.050 0.050 0.050 0.050 0.050 0.050 basic - l 0.025 0.025 0.025 0.030 0.030 0.030 0.030 0.009 - l1 0.041 0.041 0.041 0.056 0.056 0.056 0.056 basic - h 0.013 0.013 0.013 0.020 0.020 0.020 0.020 reference - n 8 14 16 16 20 24 28 reference - rev. l 2/01 notes: 1. plastic or metal protrusions of 0.006? maximum per side are not included. 2. plastic interlead protrusions of 0.010? maximum per side are not included. 3. dimensions ?d? and ?e1? are measured at datum plane ?h?. 4. dimensioning and tolerancing per asme y14.5m - 1994
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