1 ? fn8087.3 caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-intersil or1-888-468-3774 | intersil (and design) is a registered trademark of intersil americas inc. copyright intersil americas inc. 2004-2006. all rights reserved all other trademarks mentioned are the property of their respective owners. isl60007 precision 2.50v, 1.08-watt, high precision fga? voltage references the isl60007 fga? voltage references are extremely low power, very high precision analog voltage references fabricated in intersil's pr oprietary floating gate analog technology. the isl60007 features low supply voltage operation at ultra-low 400na operating current resulting in typical 1.08w power consumption. in addition, the isl60007 family features guaranteed initial accuracy as low as 0.5mv, temperature coefficients as tight as 3ppm/c and long-term stability of 10ppm/ 1khrs . the initial accuracy and thermal stability performance of the isl60007 family plus the low power consumption eliminates the need to compromise accura cy and thermal stability for reduced power consumption making it an ideal high resolution, low power da ta conversion system. pinout isl60007 (8 ld soic) top view features ? reference voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 2.50v ? absolute initial accuracy options. . . . . 0.5mv, & 1.0mv ? 1.08w typical power consumption ? supply voltage range . . . . . . . . . . . . . . . . . . 2.7v to 5.5v ? ultra-low supply current. . . . . . . . . . . . . . . . . . . . .400na ? low temperature coefficient options . . . . . . . . . 3ppm/c 5ppm/c, & 10ppm/c ? long term stability. . . . . . . . . . . . . . . . . . . 10ppm/ 1khrs ? 7ma source & sink current ? esd protection. . . . . . . . . . . . . 5kv (human body model) ? standard 8 ld soic packaging ? temperature range . . . . . . . . . . . . . . . . . . -40c to +85c ? pb-free plus anneal available (rohs compliant) applications ? high resolution a/ds & d/as ? digital meters ? bar code scanners ? mobile communications ? pda?s and notebooks ? battery management systems ? medical systems pin descriptions 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 v in dnc gnd dnc dnc v out dnc gnd ordering information part number part marking v out option grade temp. range (c) package pkg. dwg. # isl60007bib825 60007bi 25 2.500v 0.5mv, 3ppm/c -40 to +85 8 ld soic mdp0027 isl60007bib825z (note) 60007bi z25 2.500v 0.5mv, 3ppm/c -40 to +85 8 ld soic (pb-free) mdp0027 isl60007cib825 60007ci 25 2.500v 0.5mv, 5ppm/c -40 to +85 8 ld soic mdp0027 isl60007cib825z (note) 60007ci z25 2.500v 0.5mv, 5ppm/c -40 to +85 8 ld soic (pb-free) mdp0027 isl60007dib825 60007di 25 2.500v 1.0mv, 10ppm/c -40 to +85 8 ld soic mdp0027 ISL60007DIB825Z (note) 60007di z25 2.500v 1.0mv, 10ppm/c -40 to +85 8 ld soic (pb-free) mdp0027 *add "-tk" 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. data sheet april 21, 2006
2 fn8087.3 april 21, 2006 typical application v in = +3.0v 0.1f 0.001f* serial bus v in v out gnd isl60007 enable sck sdat a/d converter 16 to 24-bit ref in 10f *also see figure 17 in a pplications information. isl60007
3 fn8087.3 april 21, 2006 absolute maximum ratings recommended operating conditions storage temperature range . . . . . . . . . . . . . . . . . .-65c to +125c max voltage v in to gnd. . . . . . . . . . . . . . . . . . . . . . . -0.5v to +6.5v max voltage v out to gnd (10s) . . . . . . . . . . . . . . . -0.5v to +3.50v voltage on ?dnc? pins. . . . no connections permitted to these pins. lead temperature, soldering (10s) . . . . . . . . . . . . . . . . . . . . +225c temperature range (industrial) . . . . . . . . . . . . . . . . . . -40c to 85c caution: stresses above those listed in ?absolute maximum ratings? may cause permanent damage to the device. this is a stress o nly rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. electrical specifications operating conditions: v in = 3.0v, i out = 0ma, c out = 0.001f, t a = -40 to +85c, unless otherwise specified. symbol parameter conditions min typ max units 2.500v output voltage v out output voltage 2.500 v v oa v out accuracy @ t a = 25c isl60007b25 -0.5 +0.5 mv isl60007c25 -0.5 +0.5 mv isl60007d25 -1.0 +1.0 mv tc v out output voltage temperature coefficient (note 1) isl60007b25 3 ppm/c isl60007c25 5 ppm/c isl60007d25 10 ppm/c v in input voltage range 2.7 5.5 v i in supply current 400 800 na v out / v in line regulation +2.7v v in +5.5v 30 200 v/v v out / i out load regulation sourcing: 0ma i out 7ma 15 50 v/ma sinking: -7ma i out 0ma 50 150 v/ma v out / t long term stability (note 4) t a = 25c 10 ppm/ 1khrs v out / t a thermal hysteresis (note 2) t a = 125c 50 ppm i sc short circuit current (note 3) t a = 25c, v out tied to gnd 40 80 ma v n output voltage noise 0.1hz f 10hz 30 v p-p notes: 1. over the specified temperature range. temperature coeffici ent 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 measured @ t a = 25c after temperature cycling over a specified range, t a . v out is read initially at t a = 25c for the device under test. the dev ice is temperature cycled and a second v out measurement is taken at 25c. the difference between the initial v out reading and the second v out reading is then expressed in ppm. for t a = 125c, the device under test is cycled from +25c to +85c to -40c to +25c. 3. guaranteed by device characterization and/ or correlation to other device tests. 4. fga voltage reference long term drift is a logarithmic charac teristic. changes that occur after the first few hundred hours o f operation are significantly smaller with time, asymptot ically approaching zero beyond 1000 hours. beca use of this decreas ing characteristic, long term drift is specified in ppm/ 1khrs . isl60007
4 fn8087.3 april 21, 2006 typical performance curves, 2.5v reference v in = 3.0v, i out = 0ma, t a = 25c unless otherwise specified figure 1. i in vs v in - 3 units figure 2. i in vs v in - 3 temps figure 3. v out vs temp - 3 units figure 4. line regulation - 3 units figure 5. line regulation - 3 temps figure 6. line transient response, c l = 0nf 100 200 300 400 500 600 700 800 2.7 3.4 4.1 4.8 5.5 v in (v) i in (na) 250na 400na 570na 300 350 400 450 500 2.7 3.4 4.1 4.8 5.5 v in (v) i in (na) -40c +25c +85c 2.4992 2.4994 2.4996 2.4998 2.5 2.5002 2.5004 2.5006 2.5008 -40 -15 10 35 60 85 temperature (c) v out (v) unit 1 unit 2 unit 3 normalized to +25c 2.49980 2.49990 2.50000 2.50010 2.50020 2.50030 2.7 3.4 4.1 4.8 5.5 v in (v) v out (v) unit 2 normalized to 2.50v at v in = 3v unit 3 unit 1 -100 -50 0 50 100 150 200 2.7 3.4 4.1 4.8 5.5 v in delta v out (v) (v) -40c +25c +85c normalized to v in = 3v 1ms/div 100mv/div v in = +0.3v v in = -0.3v isl60007
5 fn8087.3 april 21, 2006 figure 7. line transient response, c l = 1nf figure 8. psrr vs f vs c l figure 9. load regulation vs temp figure 10. load transient response @ i l =50a, c l =1nf figure 11. load transient response @ i l =7ma, c l =1nf figure 12. turn-on time @ t a = 25c typical performance curves, 2.5v reference v in = 3.0v, i out = 0ma, t a = 25c unless otherwise specified (continued) 1ms/div 100mv/div v in = +0.3v v in = -0.3v no load 1nf load -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 1 10 100 1k 10k 100k 1m frequency (hz) psrr (db) 100nf load 10nf load -0.30 -0.20 -0.10 0.00 0.10 0.20 0.30 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 sinking sourcing output current delta v out (mv) +85c -40c +25c 100s/div 50mv/div i l = +50a i l = -50a 500s/div 200mv/div i l = +7ma i l = -7ma 0 0.5 1 1.5 2 2.5 3 3.5 0 2 4 6 8 10 12 time (ms) v in & v out (v) v out v in isl60007
6 fn8087.3 april 21, 2006 applications information fga technology the isl60007 series of voltag e references use the floating gate technology to create refe rences 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 version of the floating gate voltage. the resulting reference device has excellent characteristics which are unique in the industry: very low temperature drift, high initial accuracy, and almost zero supply current. also, the referenc e voltage itself is not limited by voltage bandgaps or zener settings, so a wide range of reference 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 am plifier circuitry uses cmos transistors for amplifier and output transistor circuitry. while providing excellent accuracy, there are limitations in output noise level and load regulation due to the mos device characteristics. these limita tions are addressed with circuit techniques discussed in other sections. nanopower operation reference devices achieve their highest accuracy when powered up continuously, and after initial stabilization has taken place. this drift can be eliminated by leaving the power on continuously. the isl60007 is the first high precision voltage reference with ultra low power consumption that makes it possible to leave power on continuously in battery operated circuits. the isl60007 consumes extremely lo w supply current due to the proprietary fga technology. supply current at room temperature is typically 400na which is 1 to 2 orders of magnitude lower than compet itive devices. application circuits using battery power wi ll benefit greatly from having an accurate, stable reference which essentially presents no load to the battery. in particular, battery powered data converter circuits that would normally require the entire circuit to be disabled when not in use can remain powered up between conversions as shown in figure 15. data acquisition circuits providing 12 to 24 bits of accuracy can operate with the reference device continuously biased with no power penalty, providing the highest accuracy and lowest possible long term drift. other reference devices consuming higher supply currents will need to be disabled in between conversions to conserve battery capacity. absolute accuracy will suffer as the device is biased and requires time to settle to its final value, or, may not actually settle to a final value as power on time may be short. figure 13. z out vs f vs c l figure 14. v out noise typical performance curves, 2.5v reference v in = 3.0v, i out = 0ma, t a = 25c unless otherwise specified (continued) 0 20 40 60 80 100 120 140 1 10 100 1k 10k 100k frequency (hz) z out ( ) no 1nf load load 10nf load 100nf load 10s/div 10v/div v in = +3.0v 0.001f-0.01f serial bus v in v out gnd isl60007 ref in enable sck sdat a/d converter 12 to 24-bit 0.01f 10f figure 15. isl60007
7 fn8087.3 april 21, 2006 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 most 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 30v p-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 0.1hz 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 400v p-p with no capacitance on the output, as shown in figure 16. 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 freque ncy. figure 16 also shows the noise in the 10khz to 1mhz band can be reduced to about 50v p-p using a 0.001f 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 load capacitances above 0.001f the noise reduction network shown in figure 17 is recommended. this network reduces noise significantly over the full bandwidth. as shown in figure 16, noise is reduced to less than 40v p-p from 1hz to 1mhz using this network with a 0.01f capacitor and a 2k resistor in series with a 10f capacitor. turn-on time the isl60007 devices operate wit h ultra-low supply current and thus the time to bias up internal circuitry to final values will be longer than with refer ences that require higher current. normal turn-on time is typically 4ms. this is shown in figure 18. since devices can vary in supply current down to 250na, turn-on time can last up to about 6ms. care should be taken in system design to include this delay before measurements or conversions are started. temperature coefficient the limits stated for temperature 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 multiplied by 10 6 to yield ppm/c. this is the ?box? me thod for specifying temperature coefficient. c l = 0 400 350 300 250 200 150 100 50 0 1 10 100 1000 10000 100000 noise voltage (v p-p ) figure 16. noise reduction c l = 0.001f c l = 0.01f & 10f + 2k c l = 0.1f v in = 3.0v v in v o gnd isl60007 0.01f 10f 2k 0.1f 10f figure 17. 0 0.5 1 1.5 2 2.5 3 3.5 0 2 4 6 8 10 12 time (ms) v in and v out (v) 400na v in 570na 250na figure 18. turn-on time (+25c) isl60007
8 fn8087.3 april 21, 2006 typical application circuits figure 19. precision 2.5v, 50ma reference figure 20. 2.5v dual output, high accuracy reference figure 21. kelvin sensed load v in = 5v 2n2905 2.5v/50ma 0.001f v in v out gnd isl60007 r = 200 v in v out gnd gnd v in v out isl60007 isl60007 0.1f 0.001f 2.5v 0.001f r1 v in = 3.0v -v in = -3.0v -2.5v 2.5v-|v in | r1 = -(i out ) ; i out 7ma 10f 0.1f v in = 3.0v v in v out gnd isl60007 v out sense load + ? 10f el8178 isl60007
9 fn8087.3 april 21, 2006 figure 22. negative voltage reference figure 23. 2.5v full scale low-drift 10-bit adjustable voltage source typical application circuits (continued) -2.5v r 1 limits max load current v in v out gnd isl60007 c in 0.001 c out = 0.001f r 1 = 200 -3.0v with r 1 = 200 ; i load max = 2.5ma 2.5v-|v in | r1 = -(i out ) ; i out 7ma v in v out isl60007 gnd 2.7-5.5v 0.1f 0.001f v out + ? v cc r h r l x9119 v ss sda scl 2-wire bus v out (buffered) 10f el8178 isl60007
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 fn8087.3 april 21, 2006 isl60007 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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