1 ? fn8144.1 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. 2006. all rights reserved all other trademarks mentioned are the property of their respective owners. x60008e-41 precision 4.096v fga? voltage reference the x60008-41 fga? voltage references are very high precision analog voltage referenc es 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 featur e 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 for precision industrial and po rtable systems operating at significantly higher accuracy and lower power levels than can be achieved with conventional technologies. features ? output voltage: 4.096v ? absolute initial accuracy: 5.0mv ? ultra low power supply current: 500na ? low temperature coefficient: 20ppm/c ? 10 ma source & sink current capability ? 10 ppm/1000hrs long term stability ? supply voltage range: 4.5v to 9.0v ? 5kv esd (human body model) ? standard package: soic-8 ? temp range: -40c to +85c ? pb-free plus anneal available (rohs compliant) applications ? high resolution a/ds and d/as ? precision current sources ? smart sensors ? digital meters ? precision regulators ? strain gage bridges ? calibration systems ? precision oscillators ? threshold detectors ? v-f converters ? battery management systems ? servo systems ordering information part number part marking temp. range (c) package pkg. dwg. # X60008EIS8-41 x60008e i41 -40 to 85 8 ld soic mdp0027 x60008eis8- 41t1 x60008e i41 -40 to 85 8 ld soic tape and reel mdp0027 x60008eis8z-41 (note) x60008e zi41 -40 to 85 8 ld soic (pb-free) mdp0027 note: intersil pb-free plus anneal products employ special pb-free material sets; molding 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 products are msl classi fied at pb-free peak reflow temperatures that meet or exceed the pb-free requirements of ipc/jedec j std-020. data sheet june 27, 2006
2 fn8144.1 june 27, 2006 absolute maximum ratings storage temperature range . . . . . . . . . . . . . . . . . .-65c to +125c max voltage applied v in to gnd . . . . . . . . . . . . . . . . -0.5v to +9.0v max voltage applied v out to gnd (*) . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0.5v to +5.1v 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 per manent damage to the device. these are stress ratings provi ded for informa-tion only and functional operation of the dev ice at these or any other conditions beyond those indicated in the operational sections of this specification are not implied. for guaranteed specifications and test conditions, see electrical specifications. 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. typical application * also see figure 3 in ?applications information? on page 7. package diagram pin configurations temperature min max industrial -40c +85c v in = +5.0v 0.1f serial bus v in v out gnd x60008-41 enable sck sdat a/d converter 16 to 24-bit ref in 10f 0.001f ( * ) 1 2 3 4 8 7 6 5 soic v in dnc gnd x60008-xx dnc dnc v out dnc gnd 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 x60008e-41
3 fn8144.1 june 27, 2006 electrical specifications operating conditions: v in = 5.0v, i out = 0ma, c out = 0.001f, t a = -40 to +85c, unless otherwise specified. symbol parameter conditions min typ max units v out output voltage 4.096 v v oa v out accuracy x60008e-41 t a = 25c -5.0 +5.0 mv i in supply current 500 900 na v in input voltage range 4.5 9.0 v tc v out output voltage temperature coefficient (1) x60008e-41 20 ppm/ c v out / v in line regulation +4.5v v in +8.0v 150 v/v v out / i out load regulation 0ma i source 10ma -10ma i sink 0ma 10 20 50 100 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 100 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 note: 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 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 x60008e-41
4 fn8144.1 june 27, 2006 typical performance curves (v in = 5.0v, i out = 0ma, t a = 25c, unless otherwise specified) +85 c -40 c unit 3, i in = 700na unit 1, i in = 360na unit 2, i in = 520na v in (v) v in (v) v out (v) delta v out ( v) (normailized to 4.096v at v in = 5.0v) (normailized to v in = 5.0v) line regulation line regulation (3 representative units) -100 -50 0 50 100 150 200 250 300 4.5 5 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 4.0959 4.09595 4.096 4.09605 4.0961 4.09615 4.0962 4.09625 4.0963 4.5 5.5 6.5 7.5 8.5 +25 c load regulation output current (ma) delta v out (mv) -40 c +25 c +85 c -0.1 0.0 0.1 0.2 0.3 0.4 0.5 0.6 -20 -15 -10 -5 0 5 10 15 20 sinking sourcing 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 x60008e-41
5 fn8144.1 june 27, 2006 typical performance curves (v in = 5.0v, i out = 0ma, t a = 25c, unless otherwise specified) (continued) 10ma load transient response 500mv/div c l = .001 f i l = -10ma i l = +10ma 2ms/div 50 a load transient response 100mv/div 500 sec/div c l = .001 f i l = -50 a i l = +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 x60008e-41
6 fn8144.1 june 27, 2006 typical performance curves (v in = 5.0v, i out = 0ma, t a = 25c, unless otherwise specified) (continued) frequency (hz) v out vs temperature normalized to 25 c (3 representative units) temperature ( c) v out (v) unit 1, i in = 360na unit 3, i in = 700na unit 2, i in = 520na psrr vs cap load no load 1nf load 10nf load 100nf load 4.09 4.0912 4.0924 4.0936 4.0948 4.096 4.0972 4.0984 4.0996 -40 -15 10 35 60 85 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 11 0 100 1000 10000 100000 1000000 psrr (db) z out vs frequency frequency (hz) z out ( ) no load 1nf load 10nf load 100nf load i in (na) v in (v) -40 c 25 c 85 c i in vs v in 0 50 100 150 200 250 300 350 1 10 100 1000 10000 100000 0 100 200 300 400 500 600 700 800 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 i in (na) v in (v) i in vs v in (3 representative units) turn-on time -1 1 3 5 7 9 11 v in & v out (v) 0 100 200 300 400 500 600 700 800 900 1000 4.5 5 5.5 6 6.5 7 7.5 8 8. 59 unit 1 unit 2 unit 3 time (msec) v in v out 0 1 2 3 4 5 6 x60008e-41
7 fn8144.1 june 27, 2006 applications information fga technology the x60008 series of voltage 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 x60008 is the first high precision voltage reference with ultra low power consumption that makes it practical to leave power-on continuously in battery operated circuits. the x60008 consumes extremely low supply current 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 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 1. data acquisition circuits providing 12 to 24 bits of accuracy can operat e with the reference device continuously biased with no po wer 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 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 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 30vp-p. this is shown in the plot in the typical performance curves. the nois e measurement is made with a bandpass filter made of a 1 po le 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 figure 2. 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 load capacitances above .001f the noise reduction network shown in figure 3 is recommended. this network reduces noise sig-nificantly over the full bandwidth. as shown in figure 2, noise is reduced to less than 40vp-p from 1hz to 1mhz using this network with a .01f capacitor and a 2k resistor in series with a 10f capacitor. v in = 4.5 - 9v 0.001f serial bus v in v out gnd x60008-41 ref in enable sck sdat a/d converter 12 to 24-bit 0.01f 10f x60008e-41
8 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 fn8144.1 june 27, 2006 figure 2. figure 3. turn-on time the x60008 devices have ultra-low supply current and thus the time to bias up internal circuitry to final values will be longer than with higher power references. normal turn-on time is typically 7ms. this is shown in the graph, figure 4. since devices can vary in supply current down to 300na, turn-on time can last up to about 12ms. care should be taken in system design to in clude this de lay before measurements or conversions are started. figure 4. 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? method for determining temperature coefficient. 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 x60008-41 noise reduction noise voltage (vp-p) v in = 5.0v v in v o gnd x60008-41 .01f 10f 2k .1f 10f x60008 turn-on time (25 c) (3 representative units) time (msec) v in & v out (v) i in = 700na i in = 520na i in = 360na v in 0 1 2 3 4 5 6 -11 3579 11 x60008e-41
9 fn8144.1 june 27, 2006 typical application circuits precision 4.096v, 50ma reference. v in = 5.2v to 9v 2n2905 4.096v/50ma 0.001f v in v out gnd x60008-41 kelvin sensed load 0.1f 4.5v to 9v v in v out gnd x60008-41 v out sense load r = 200 + ? v in v out x60008-41 gnd 4.5v to 9v 0.1f 0.001f v out + ? v cc r h r l x9119 v ss sda scl 2-wire bus v out (buffered) 4.096v full scale low-drift 10-bit adjustable voltage source x60008e-41
10 fn8144.1 june 27, 2006 x60008e-41 small outline p ackage 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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