rev 1.2.6 4/22/04 1 of 10 www.xicor.com features output voltage: 2.500v absolute initial accuracy options: ?.5mv & ?.0mv ultra low power supply current: 500na ? ow t emperature coef?ient options: 3, 5 & 10ppm/? 10 ma source & sink current capability 10 ppm/1000hrs long term stability supply voltage range: 4.5v to 6.5v 5kv esd (human body model) standard package: soic-8 ? emp range: -40? to +85? description the x60008-25 fga voltage references are very high precision analog voltage references fabricated in xicor 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 coef?ient, 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 & portable systems operating at signi?antly higher accuracy and lower power levels than can be achieved with conventional technologies. t ypical application applications high resolution a/ds & d/as ?precision current sources ?smart sensors digital meters precision regulators strain gage bridges calibration systems ?precision oscillators ?threshold detectors ? -f converters ?battery management systems ?servo systems v in = +5.0v 0.1? serial bus v in v out gnd x60008-25 enable sck sdat a/d converter 16 to 24-bit ref in 10? 0.001? ( * ) ( * ) also see figure 3 in applications information precision 2.5v fga voltage reference x60008b-25 x60008c-25 X60008D-25
2 of 10 rev 1.2.6 4/22/04 www.xicor.com x60008b-25, x60008c-25, X60008D-25 package diagram pin configurations ordering information 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 logo device part number 60008 = standard grade b = ?.5 mv, 3 ppm/? c = ?.5 mv, 5 ppm/? d = ?.0 mv, 10 ppm/? temperature range i = -40? to +85? package s8 = 8 lead soic v out option 25 = 2.500v x 60008 c i s8 ?25
3 of 10 rev 1.2.6 4/22/04 www.xicor.com x60008b-25, x60008c-25, X60008D-25 absolute maximum ratings storage temperature range .................?5? to +125? max voltage applied v in to gnd ............... ?.5v to +6.5v max voltage applied v out to gnd (*) ......... ?.5v to +3.5v v oltage on ?nc pins ......... no connections permitted to these pins. lead temperature, soldering (*) ............................+ 225? (*) 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 ratings provided for informa- tion only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this speci?ation are not implied. f or guaranteed speci?ations and test conditions, see electrical characteristics. the guaranteed speci?ations apply only for the test conditions listed. some performance characteristics may degrade when the device is not operated under the listed test conditions. temperature min. max. industrial ?0? +85? electrical characteristics (operating conditions: v in = 5.0v, i out = 0ma, c out = 0.001?, t a = -40 to +85? unless otherwise specified.) note: 1. over the speci?d temperature range. temperature coef?ient is measured by the box method whereby the change in v out is divided by the temperature range; in this case, -40? to +85? = 125?. 2. thermal hysteresis is the change in v out created by package stress @ t a = 25? after temperature cycling. v out is read initially at t a = 25?; the x60008 is then cycled between hot (85?) and cold (-40?) before a second v out measurement is taken at 25?. 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. 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 = 25? -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 = 25? 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 = 25? 50 80 ma v n output voltage noise 0.1hz to 10hz 30 v pp
4 of 10 rev 1.2.6 4/22/04 www.xicor.com x60008b-25, x60008c-25, X60008D-25 typical performance characteristic curves (v in = 5.0v, i out = 0ma, t a = 25? unless otherwise speci?d) 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 11 0 100 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
5 of 10 rev 1.2.6 4/22/04 www.xicor.com x60008b-25, x60008c-25, X60008D-25 typical performance characteristic curves (v in = 5.0v, i out = 0ma, t a = 25? unless otherwise speci?d) 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, x60008c-25, X60008D-25 6 of 10 rev 1.2.6 4/22/04 www.xicor.com typical performance characteristic curves (v in = 5.0v, i out = 0ma, t a = 25? unless otherwise speci?d) 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 -1 1357911 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?
7 of 10 rev 1.2.6 4/22/04 www.xicor.com x60008b-25, x60008c-25, X60008D-25 applications information fga technology the x60008 series of voltage references use the ?at- ing gate technology to create references with very low drift and supply current. essentially the charge stored on a ?ating gate cell is set precisely in manufacturing. the reference voltage output itself is a buffered version of the ?ating 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 ref- erence voltage itself is not limited by voltage bandgaps or zener settings, so a wide range of reference volt- ages can be programmed (standard voltage settings are provided, but customer-speci? voltages are avail- able). the process used for these reference devices is a ?ating gate cmos process, and the ampli?r circuitry uses cmos transistors for ampli?r and output transis- tor 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 stabili- zation has taken place. this drift can be eliminated by leaving the power on continuously. the x60008 is the ?st high precision voltage refer- ence with ultra low power consumption that makes it possible to leave power on continuously in battery operated circuits. the x60008 consumes extremely low supply current due to the proprietary fga technol- ogy. 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 bene? greatly from having an accurate, sta- b le 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 dis- abled when not in use can remain powered up between conversions as shown in ?ure 1. data acqui- sition 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 cur- rents 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 set- tle to its ?al value, or, may not actually settle to a ?al v alue as power on time may be short. figure 1. board mounting considerations f or 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 ?xprint or e xtremely 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 30?p-p. this is shown in the plot in the t ypical performance curves. the noise measurement is made with a bandpass ?ter made of a 1 pole high- pass ?ter with a corner frequency at .1hz and a 2-pole low-pass ?ter with a corner frequency at 12.6hz to create a ?ter with a 9.9hz bandwidth. noise in the 10khz to 1mhz bandwidth is approximately 400?p-p with no capacitance on the output, as shown in fig. 2 below. these noise measurements are made with a 2 decade bandpass ?ter made of a 1 pole high-pass v in = 4.5v to 6.5v 0.001? serial bus v in v out gnd x60008-25 ref in enable sck sdat a/d converter 12 to 24-bit 0.01? 10?
x60008b-25, x60008c-25, X60008D-25 8 of 10 rev 1.2.6 4/22/04 www.xicor.com ?ter with a corner frequency at 1/10 of the center frequency and 1-pole low-pass ?ter 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 50?p-p using a .001? capacitor on the output. noise in the 1khz to 100khz band can be further reduced using a 0.1? capacitor on the output, but noise in the 1hz to 100hz band increases due to instability of the very low power ampli?r with a 0.1? capacitance load. for load capacitances above .001? the noise reduction network shown in ?. 3 is recommended. this network reduces noise sig- ni?antly over the full bandwidth. as shown in ?. 2, noise is reduced to less than 40?p-p from 1hz to 1mhz using this network with a .01? capacitor and a 2kohm resistor in series with a 10? capacitor. 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 ?al values will be longer than with higher power references. nor- mal turn-on time is typically 7ms. this is shown in the gr aph, 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 temperature coef?ient (tempco) are governed by the method of measurement. the ov erwhelming 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=25?) and multi- plied by 10 6 to yield ppm/?. this is the ?ox method. cl = 0 cl = .001? cl = .1? cl = .01? & 10? + 2kohm 400 350 300 250 200 150 100 50 0 11 0 100 1000 10000 100000 x60008-25 noise reduction noise voltage (?p-p) v in = 6.5v v in v o gnd x60008-25 .01? 10? 2k ? .1? 10? 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)
9 of 10 rev 1.2.6 4/22/04 www.xicor.com x60008b-25, x60008c-25, X60008D-25 typical application circuits precision 2.5v, 50ma reference. v in = 5.2v to 6.5v 2n2905 2.5v/50ma 0.009? v in v out gnd x60008-25 kelvin sensed load 0.1? 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 0.1? 0.01? 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
characteristics subject to change without notice. 10 of 10 limited warranty devices sold by xicor, inc. are covered by the warranty and patent indemni?ation provisions appearing in its terms of sale onl y. xicor, inc. makes no warranty, e xpress, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the descr ibed devices from patent infringement. xicor, inc. makes no warranty of merchantability or ?ness for any purpose. xicor, inc. reserves the right to discontinue produ ction and change speci?ations and prices at any time and without notice. xicor, inc. assumes no responsibility for the use of any circuitry other than circuitry embodied in a xicor, inc. product. no o ther circuits, patents, or licenses are implied. trademark disclaimer: xicor and the xicor logo are registered trademarks of xicor, inc. autostore, direct write, block lock, serialflash, mps, biaslo ck and xdcp are also trademarks of xicor, inc. all others belong to their respective owners. u .s. patents xicor products are covered by one or more of the following u.s. patents: 4,326,134; 4,393,481; 4,404,475; 4,450,402; 4,486,769; 4,488,060; 4,520,461; 4,533,846; 4,599,706; 4,617,652; 4,668,932; 4,752,912; 4,829,482; 4,874,967; 4,883,976; 4,980,859; 5,012,132; 5,003,197; 5,023,694; 5,084, 667; 5,153,880; 5,153,691; 5,161,137; 5,219,774; 5,270,927; 5,324,676; 5,434,396; 5,544,103; 5,587,573; 5,835,409; 5,977,585. foreign patents and addition al patents pending. life related policy in situations where semiconductor component failure may endanger life, system designers using this product should design the sy stem with appropriate error detection and correction, redundancy and back-up features to prevent such an occurrence. xicor s products are not authorized for use in critical components in life support devices or systems. 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) sup port or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to res ult in a signi?ant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. ?icor, inc. 2004 patents pending rev 1.2.6 4/22/04 www.xicor.com x60008b-25, x60008c-25, X60008D-25 packaging information 0.150 (3.80) 0.158 (4.00) 0.228 (5.80) 0.244 (6.20) 0.014 (0.35) 0.019 (0.49) pin 1 pin 1 index 0.010 (0.25) 0.020 (0.50) 0.050 (1.27) 0.188 (4.78) 0.197 (5.00) 0.004 (0.19) 0.010 (0.25) 0.053 (1.35) 0.069 (1.75) (4x) 7 0.016 (0.410) 0.037 (0.937) 0.0075 (0.19) 0.010 (0.25) 0?- 8 x 45 8-lead plastic, soic, package code s8 note: all dimensions in inches (in parentheses in millimeters) 0.250" 0.050" typical 0.050" typical 0.030" typical 8 places footprint
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