date: 09/10/04 spx385-1.2 micropower voltage reference ?copyright 2004 sipex corporation 1 features low output voltage ................................ 1.235v dynamic impedance...............................1 ? max low temperature coefficient........30ppm/ c (typ) operating current ........................ 10 a to 20ma extended temperature range .. -40 c to +85 c initial tolerance..................................1% and 2% pin compatible with lm185/285/385, 1.23v micropower voltage reference spx385-1.2 the spx385-1.2 is a micropower 2-terminal band-gap voltage reference with a very wide operating current range from 10 a to 20ma that provides a stable voltage. the high stability of this device is primarily the result of the low temperature coefficient thin film resistor process and laser trimming of the output voltage at the wafer level. the spx385-1.2 is available in a to-92, soic-8 and sot-89 package with an operating temperature range of -40 c to 85 c. a 2.5 and 5.0 volt devices are also available - spx385-2.5, spx385-5.0. figure 1: block diagram applications portable meter reference portable test instruments battery operated systems panel meters 1.235v + - cathode (k) anode (a) description block diagram now available in lead free packaging 1 2 3 4 5 6 7 8 spx385-1.2 8 pin nsoic cathode n/c anode n/c n/c n/c n/c n/c
date: 09/10/04 spx385-1.2 micropower voltage reference ?copyright 2004 sipex corporation 2 reverse current (i ka )) ................................................................. 30ma forward current (i ak ) .................................................................. 10ma operating temperature range (t a ) ................................. -40 to +85 c continuos power dissipation at 25 c (p d ) to-92 ................................................................... 775mw soic-8 ................................................................. 750mw sot-89 ............................................................... 1000mw junction temperature (t j ) .......................................................... 150 c storage temperature (t stg ) ............................................ - 65 to 150 c lead temperature (soldering 10 sec.), t l .................................. 300 c i in = 100 a, t a = 25 c, unless otherwise specified. * ? t ? v ka -5 0.5 5000 0 00 tc in mv /c = tc in % /c = ? v ka (mv) ? t a ? t a ? v ka at 25c ? v ka x 100 () tc in ppm/c = ? t a ? v ka at 25c ? v ka x10 6 () ppm % mv junction temperature ( c) 0153 045607590105 27 ppm/c 0.0027 %/ c 0.033 mv/ c figure 2. v ref vs. temperature spx385a-1.2 spx385-1.2 parameter conditions min. typ. max min. typ. max. unit reference voltage 1.223 1.235 1.247 1.205 1.235 1.260 v dynamic output f = 20hz 0.6 1.0 0.6 1.0 ? impedance i r = 100 a reference voltage 10 a i r 20ma 10 20 10 20 mv change with i r temperature coefficient note 1 30 50 30 50 ppm/ c minimum operating current 8 10 8 10 a output wideband noise 10hz f 10khz 60 60 vrms operating temperature -40 +85 -40 +85 c stresses greater than those listed under absolute maximum rat- ings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. note 1. three-point measurement guarantees the error band over the specified temperature range. absolute maximum ratings typical thermal resistances package 0 ja 0 ja typical derating to-92 160 c/w 80 c/w 6.3 mw/ c soic-8 175 c/w 45 c/w 5.7mw/ c sot-89 110 c/w 8 c/w 9.1mw/ c electrical characteristics calculating average temperature coefficient (tc)
date: 09/10/04 spx385-1.2 micropower voltage reference ?copyright 2004 sipex corporation 3 typical performance characteristics figure 3. test circuit for v ka =v ref figure 4. high current operating characteristics figure 5. reference voltage vs. ambient temperature figure 6. low current operating characteristics v in v ka = v ref i k -2 -1 0123 0 i k - cathode current (ma) v ka - cathode voltage (v) t emperature range: 0 c to 85 c 30 25 20 15 10 5 -5 -10 -15 -20 1.23 v ref - reference voltage (v) t a - ambient temperature (c) 90 120 -60 -30 0 30 60 1.250 i k = 10ma 1.245 1.240 1.235 1.230 1.225 1.200 1.150 1.100 18 0 -1.0 0 1.5 85 c 25 c -0 c te mperature range: 0 c to 85 c v ka - cathode voltage (v) i k - cathode current (a) 0.5 1.0 12 6 -0.5 figure 7a. precision 1 a to 1ma current sink figure 7b. precision 1 a to 1ma current source lm312 r1 100k + r2 c1 150pf 7 6 4 3 2 spx385-1.2 i out * -1.5v to -27v * i out = 1.23v r2 -30v lm312 r1 100k + r2 c1 150pf 7 6 4 3 2 spx385-1.2 i out * 1.5v to 27v * i out = 1.23v r2 30v
date: 09/10/04 spx385-1.2 micropower voltage reference ?copyright 2004 sipex corporation 4 typical performance characteristics figure 8. reference from 1.5v battery figure 9. micropower reference from 9v battery figure 10. wide input range reference figure 11: precision micropower 10v reference 3k 1.5v spx385-1.2 1.2v 500k 9v spx385-1.2 1.2v 4.3k v in = 2.3v to 30v spx385-1.2 out 1.2v lm334 spx385-1.2 1m + - v in = 15v lm4250c 3 7 2 4 8 22m 3.5m 500k 150pf 6 10v i q ? 20 a standby current i q
date: 09/10/04 spx385-1.2 micropower voltage reference ?copyright 2004 sipex corporation 5 package: 8 pin nsoic see view c to p view 8 pin nsoic 1 1.65 dimensions minimum/maximum (mm) 8 pin nsoic (jedec ms-012, aa - variation) common height dimension a a1 a2 b c l e e1 e l2 l1 1.35 4.90 bsc 0.40 0.31 0.51 symbol min nom max 0.10 - 0 . 2 5 d 1.75 1.25 0.17 0.25 6.00 bsc 3.90 bsc 1.27 bsc 1.27 1.04 ref 0.25 bsc 0 5 8 15 - - - - - - - e e e/2 e1 index area (d/2 x e1/2) e1/2 d b 1 l1 l 1 1 seating plane gauge plane l2 view c a a2 a1 seating plane side view c with plating base metal b contact area
date: 09/10/04 spx385-1.2 micropower voltage reference ?copyright 2004 sipex corporation 6 package: 3 pin to-92 d w l e1 e b a s1 ? (2x) e r dimensions minimum/maximum (mm) 3 pin to-92 carsem dwg # tlg920001 common height dimension a b e e e1 w s1 r l 4.32 0.41 2.41 2.67 symbol min nom max 0.36 - 0.51 4.95 3.30 1.14 1.40 0.56 4.45 4 4.95 6 - - - - - - - 12.70 15.49 - - - 2.16 2.41 1.14 1.52 d ? 3.94 3 pin to-92
date: 09/10/04 spx385-1.2 micropower voltage reference ?copyright 2004 sipex corporation 7 package: 3 pin sot-89 h e e e1 d d1 1 2 3 1.40 1.50 1.60 dimensions in (mm) 3 pin sot-89 lingsen # po-sot-004 0.36 0.42 0.48 4.40 4.50 4.60 a b1 c d h e l min nom max 1.40 1.60 1.75 3.94 - 4.25 e e1 1.0 c 5?2x) bb1 b ro.15 b?2x) b 0.41 0.47 0.53 0.38 0.40 0.43 d1 1.45 1.50 1.55 2.90 3.00 3.10 2.40 2.50 2.60 0.80 - 1.20 3 pin sot-89
date: 09/10/04 spx385-1.2 micropower voltage reference ?copyright 2004 sipex corporation 8 part number accuracy output voltage package type spx385am1-1.2 1.0% 1.235v 3-pin sot-89 spx385am1-1.2/tr 1.0% 1.235v 3-pin sot-89 spx385as-1.2 1.0% 1.235v 8-pin nsoic spx385as-1.2/tr 1.0% 1.235v 8-pin nsoic spx385an-1.2 1.0% 1.235v 3-pin to-92 spx385an-1.2/tr 1.0% 1.235v 3-pin to-92 spx385m1-1.2 2.0% 1.235v 3-pin sot-89 spx385m1-1.2/tr 2.0% 1.235v 3-pin sot-89 spx385s-1.2 2.0% 1.235v 8-pin nsoic spx385s-1.2/tr 2.0% 1.235v 8-pin nsoic spx385n-1.2 2.0% 1.235v 3-pin to-92 spx385n-1.2/tr 2.0% 1.235v 3-pin to-92 analog excellence sipex corporation headquarters and sales office: 233 hillview dr milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability aris ing out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor t he rights of others. pinouts t op view sot-89 (m1) 1 2 3 bottom view t o-92 (n) 13 2 n/c anode cathode n/c cathode t op view 2 1 3 4 8 7 6 5 8-pin surface mount (s) cathode anode n/c n/c n/c n/c n/c n/c anode ordering information /tr = tape and reel pack quantity is 2000 for to-92; 2500 for nsoic and sot-89. available in lead free packaging. to order add "-l" suffix to part number. example: spx385s-1.2/tr = standard; spx385s-l-1.2/tr = lead free
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