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half-duplex i coupler ? isolated rs-485 transceiver adm2483 rev. 0 in fo rmation furn ished by an alog d e v i c e s is believed to be accurate and reliable. how e ver, n o resp on sibili ty is assume d b y a n alog de vices fo r its use, nor for an y i n fri n geme nt s of p a t e nt s or ot h e r ri ght s o f th ird parties th at may result fro m its use . s p ecificatio n s subj ec t to ch an g e witho u t n o tice. no licen s e is g r an te d by implicati o n or ot herwi s e u n der a n y p a t e nt or p a t e nt ri ghts of analog de v i ces. trademarks an d registered tra d ema r ks are the prop erty o f their respective ow ners. one technolog y way, p.o . box 9106, norwood, ma 02062-9106, u.s.a. t e l: 781. 329. 4 700 www.analog.com fax: 781. 326. 87 03 ? 2004 analog de vices, i n c. al l r i ght s r e ser v ed . features rs-485 transc eiver with e l e c trical data is olation complies wit h ans i ti a/ei a rs -4 85- a- 1 9 9 8 an d iso 84 82: 19 8 7 (e) 50 0 kbps dat a rate slew rateClimited driver outputs low power o p eration: 2.5 ma ma x suitable for 5 v or 3 v oper ation (v dd 1 ) high commo n -mo d e trans i ent immunit y : >25 kv/s true fail -safe receiver in puts glitch-free po wer-up/-down protection 25 6 no des on bus t h ermal shut down protection safety and regulatory approvals: ul recognitio n: 25 00 v rm s for 1 minute per ul 1577 csa component acceptance notice #5a vde certificate of conformity din en 60 74 7 - 5- 2 (vde 08 8 4 re v. 2): 2 0 0 3 -0 1 din en 60950 (vde 0805): 2 001-12; en 60950: 2000 v ior m = 56 0 v peak operating te mperature ra nge: ?4 0c to + 85c applic ati o ns low pow e r rs- 4 85 /rs-4 22 netw ork s isolated interfaces buildin g cont rol networks multipoint d a ta transm ission system s func tio n a l block di agram de v dd1 gnd 1 gnd 2 v dd2 txd power_valid rxd re galvanic isolation a b 04736- 001 adm2483 fi g u r e 1 . general description the ad m2483 dif f er en tial b u s tra n s c ei v e r is an in teg r a t e d , ga lva n ic a l ly is ol a t e d co m p on e n t desig n e d fo r b i dir e c t io na l da t a co mm unic a t io n o n balance d , m u l t i p o i n t b u s tra n smis sio n l i n e s. i t co m p lies wi th ans i ti a/ei a rs-485-a and i s o 8482:1987(e). u s in g analog d evices i co u p l e r ? te ch nol o g y , t h e ad m2483 co m b in es a 3 - c h a n ne l is ol a t o r , a 3-s t a t e dif f er en tial line dr i v er , and a dif f er en t i a l in p u t r e cei v er i n to a sin g le pa c k a g e . t h e l o gi c s i d e o f th e d e v i c e i s po w e r e d w i th e i th e r a 5 v or 3 v su p p ly , w h i l e t h e b u s s i de u s e s a 5 v su p p ly on ly . the ad m2483 is s l ew-limi t ed to r e d u ce r e f l ec tio n s wi th im p r o p erly t e r m ina t e d t r an sm issio n li n e s. t h e co n t r o l l e d sle w ra t e limi ts t h e da ta ra t e t o 500 k b ps. th e de vic e s in p u t im p e dan c e is 96 k?, al lo win g u p t o 256 tra n s c ei v e rs o n t h e b u s. i t s dr i v er has a n ac t i v e - h ig h enab le . th e dr i v er dif f er en t i al o u t p uts an d r e c e i v er dif f er en t i a l in p u ts a r e co nn e c te d in ter n al l y t o fo r m a dif f er en t i al i/ o p o r t . w h en t h e dr i v e r is dis a b l e d o r wh e n v dd 1 or v dd 2 = 0, t h is im p o s e s mini ma l lo adi n g o n t h e b u s. an ac t i v e - h ig h r e ce i v er di s a b l e , w h ich ca us es t h e r e ce i v e o u t p u t t o en t e r a hig h im p e dance s t a t e , is p r o v ided as we l l . the r e cei v er i n p u ts ha ve a t r ue fa il-s a f e fe a t ur e t h a t ens u r e s a log i c-hig h r e ce iv er o u t p u t l e v e l w h en t h e i n p u ts a r e o p en o r shor te d. t h i s g u ar an te e s t h a t t h e re c e i v e r out p ut s are i n a k n o w n st a t e b e fo r e co mm uni c a t io n b e g i n s an d a t t h e p o in t w h en co m m un i c a t ion e n ds. c u r r en t lim i t i ng a nd t h er ma l sh u t d o wn fe a t ures p r o t e c t a g a i nst output s h or t c i rc u i t s a n d bu s c o n t e n t i on s i tu at i o ns t h a t m i g h t ca us e exces s i v e p o w e r dis s i p a t i o n. th e p a r t is f u l l y s p e c if ie d o v er t h e i n d u s t r i al t e m p era t ur e ra n g e a nd is a v aila b l e in a 16-lead wide bo d y so i c p a c k a g e .
adm2483 rev. 0 | page 2 of 20 table of contents specifications ..................................................................................... 3 timing specifications ....................................................................... 4 absolute maximum ratings ............................................................ 5 esd caution .................................................................................. 5 package characteristics ............................................................... 6 regulatory information ............................................................... 6 insulation and safety-related specifications ............................ 6 vde 0884 insulation characteristics , ....................................... 7 pin configurations and function descriptions ........................... 8 test circ u its ....................................................................................... 9 switching characteristics .............................................................. 10 typical performance characteristics ........................................... 11 circuit description ......................................................................... 14 electrical isolation ...................................................................... 14 tr uth tables ................................................................................. 15 power-up/power-down characteristics ................................. 15 thermal shutdown .................................................................... 15 true fail-safe receiver inputs .................................................. 15 magnetic field immunity .......................................................... 15 applications information .............................................................. 17 power_valid input ..................................................................... 17 isolated power supply circuit .................................................. 17 outline dimensions ....................................................................... 18 ordering guide .......................................................................... 18 revision history 10-04revision 0: initial version
adm2483 rev. 0 | page 3 of 20 specifications 2.7 v dd1 5.5 v, 4.75 v v dd2 5.25 v, t a = t min to t max , unless otherwise noted. table 1. parameter min typ max unit test conditions/comments driver differential outputs: differential output voltage, v od 5 v r = , figure 3 2.0 5 v r = 50 ? (rs-422), figure 3 1.5 5 v r = 27 ? (rs-485), figure 3 1.5 5 v v tst = ?7 v to 12 v, v dd1 4.75, figure 4 ? |v od | for complementary output states 0.2 v r = 27 ? or 50 ?, figure 3 common-mode output voltage, v oc 3 v r = 27 ? or 50 ?, figure 3 ? |v oc | for complementary output states 0.2 v r = 27 ? or 50 ?, figure 3 output short-circuit current, v out = high ?250 +250 ma ?7 v v out + 12 v output short-circuit current, v out = low ?250 +250 ma ?7 v v out + 12 v logic inputs: input high voltage 0.7 v dd1 v txd, de, re , pv input low voltage 0.25 v dd1 v txd, de, re , pv cmos logic input current (txd, de, re , pv) ?10 +0.01 +10 a txd, de, re , pv = v dd1 or 0 v receiver differential inputs: differential input threshold voltage, v th ?200 ?125 ?30 mv ?7 v v cm +12 v input hysteresis 20 mv ?7 v v cm +12 v input resistance (a, b) 96 150 k? ?7 v v cm +12 v input current (a, b) 0.125 ma v in = +12 v ?0.1 ma v in = ?7 v rxd logic output: output high voltage v dd1 ?0.1 v i out = 20 a, v a ? v b = 0.2 v v dd1 ?0.4 v dd1 ?0.2 v i out = 4 ma, v a ? v b = 0.2 v output low voltage 0.1 v i out = ?20 a, v a ? v b = ?0.2 v 0.4 v i out = ?4 ma, v a ? v b = ?0.2 v output short-circuit current 7 85 ma v out = gnd or v cc three-state output leakage current 1 a 0.4 v v out 2.4 v power supply current logic side 2.5 ma 4.5 v v dd1 5.5 v, outputs unloaded, re = 0 v 1.3 ma 2.7 v v dd1 3.3 v, outputs unloaded, re = 0 v bus side 2.0 ma outputs unloaded, de = 5 v 1.7 ma outputs unloaded, de = 0 v common-mode transient immunity 1 25 kv/s t d = v dd1 or 0 v, v cm = 1 kv, transient magnitude = 800 v 1 common-mode transient immunity is the maximum common-mode voltage slew rate that can be sustained while maintaining specificat ion-compliant operation. v cm is the common-mode potential difference between the logic and bus sides. the transient magnitude is the range over which the co mmon mode is slewed. the common-mode voltage slew rates apply to both rising and falling common-mode voltage edges.
adm2483 rev. 0 | page 4 of 20 timing specifications 2.7 v dd1 5.5 v, 4.75 v v dd2 5.25 v, t a = t min to t max , unless otherwise noted. table 2. parameter min typ max units test conditions/comments driver maximum data rate 500 kbps propagation delay, t plh , t phl 250 620 ns r ldiff = 54 ?, c l1 = c l2 = 100 pf, figure 5 and figure 9 skew, t skew 40 ns r ldiff = 54 ?, c l1 = c l2 = 100 pf, figure 5 and figure 9 rise/fall time, t r , t f 200 600 ns r ldiff = 54 ?, c l1 = c l2 = 100 pf, figure 5 and figure 9 enable time 1050 ns r l = 500 ?, c l = 100 pf, figure 6 and figure 11 disable time 1050 ns r l = 500 ?, c l = 15 pf, figure 6 and figure 11 receiver propagation delay, t plh , t phl 400 1050 ns c l = 15 pf, figure 7 and figure 10 differential skew, t skew 250 ns c l = 15 pf, figure 7 and figure 10 enable time 25 70 ns r l = 1 k?, c l = 15 pf, figure 8 and figure 12 disable time 40 70 ns r l = 1 k?, c l = 15 pf, figure 8 and figure 12 power valid input enable time 1 2 s disable time 3 5 s
adm2483 rev. 0 | page 5 of 2 0 absolute maximum ratings t a = 25c, unle s s o t h e r w is e n o te d . al l v o l t a g es a r e r e la t i v e t o t h eir r e s p e c t i v e g r o u nd . table 3. parameter rating v dd1 ?0.5 v to +7 v v dd2 ?0.5 v to +6 v digital input voltage (de, re , t d ) ?0.5 v to v dd1 +0.5 v digital output v o ltage r d ?0.5 v to v dd1 +0.5 v driver output/ receiver inp ut voltage ?9 v to +14 v operating temperature range ?40c to +85c storage temperature range ?55c to +150c average output current per pin ?35 ma to +35 ma ja thermal imp e dance 73c/w lead temperature soldering (10 s) 260c vapor phase (60 s) 215c infrared (15 s) 220c s t r e s s es a b o v e t h os e list e d u nde r a b s o l u te m a xim u m r a t i n g s ma y ca us e p e r m a n e n t dama ge to t h e de vi ce. t h is is a st r e ss r a t i ng on ly a n d f u nc t i on a l op e r a t i o n of t h e d e v i c e a t t h e s e or a n y o t h e r con d i t io n s ab o v e t h o s e i ndic a t e d i n t h e op era t io nal s e c t io n o f t h is sp e c if ic a t io n is no t im pl ie d . e x p o sur e t o a b s o l u te max i m u m r a t i ng co ndi t i on s fo r ex tende d p e r i o d s ma y a f fe c t de vice rel i a b i l i t y . esd caution esd (electrostatic discharge) sensitive device. ele c tros tatic charg e s as high as 4000 v readily accumulate on the human body and test eq uipment and can discharge wi thout detection. although this product features proprietary esd protection circu i try, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. theref ore, prop er esd precautions a r e recommended to avoid perform a nce degradation or l o ss of functiona l ity.
adm2483 rev. 0 | page 6 of 20 package characteristics table 4. parameter symbol min typ max unit test conditions resistance (input ? output) 1 r i-o 10 1, 2 ? capacitance (input ? output) 1 c i-o 3 pf f = 1 mhz input capacitance 2 c i 4 pf input ic junction-to-case thermal resistance jci 33 c/w thermocouple located at center of package underside output ic junction-to-case thermal resistance jco 28 c/w thermocouple located at center of package underside 1 device considered a two -terminal device: pins 1, 2, 3, 4, 5, 6, 7, and 8 shorted together, and pins 9, 10, 11, 12, 13, 14, 15, and 16 shorted together. 2 input capacitance is from any input data pin to ground. regulatory information the adm2483 has been approved by the following organizations: table 5. ul 1 csa vde 2 recognized under 1577 component recognition program approved under csa component acceptance notice #5a approved according to din en 60747-5-2 (vde 0884 rev. 2): 2002-04 din en 60950 (vde 0805): 2001-12; en 60950: 2000 file e214100 file 205078 file 2471900-4880-0001 1 in accordance with ul1577, each adm2483 is proof-tested by applying an insu lation test voltage 3000 vrms for 1 s (current leakage detection limit = 5 a). 2 in accordance with vde 0884, each adm2483 is proof-tested by applyi ng an insulation test voltage 1050 v peak for 1 s (partial discharge detection limit = 5 pc). insulation and safety-related specifications table 6. parameter symbol value unit conditions rated dielectric insulation voltage 2500 v rms 1-minute duration minimum external air gap (clearance) l(i01) 8.40 min mm measured from input terminals to output terminals, shortest distance through air minimum external tracking (creepage) l(i02) 8.1 min mm measured from input terminals to output terminals, shortest distance path along body minimum internal gap (internal clearance) 0.017 min mm insulation distance through insulation tracking resistance (comparative tracking index) cti >175 v din iec 112/vde 0303 part 1 isolation group iiia material group (table 1 in din vde 0110,1/89)
adm2483 rev. 0 | page 7 of 20 vde 0884 insulation characteristics 1 , 2 table 7. description symbol characteristic unit installation classification per din vde 0110 for rated mains voltage 150 vrms i to iv 300 vrms i to iii 400 vrms i to ii climatic classification 40/85/21 pollution degree (table 1 in din vde 0110) 2 maximum working insulation voltage v iorm 560 v peak input to output test voltage, method b1 v pr 1050 v peak v iorm 1.875 = v pr , 100% production tested t m = 1s, partial discharge <5 pc input to output test voltage, method a (after environmental tests, subgroup 1) v iorm 1.6 = v pr , t m = 60 s, partial discharge <5 pc 896 v peak (after input and/or safety test, subgroup 2/3) v iorm 1.2 = v pr , t m = 60 s, partial discharge <5 pc v pr 672 v peak highest allowable overvoltage (transient overvoltage, t tr = 10 s) v tr 4000 v peak safety-limiting values (maximum value allowe d in the event of a failure. see thermal derating curve, figure 24.) case temperature t s 150 c input current i s, input 265 ma output current i s,output 335 ma insulation resistance at t s , v io = 500 v r s >10 9 ? 1 suitable for basic electrical isolation only within this safety limit data. maintenance of this safety data shall be ensured b y means of protective circuits. 2 an asterisk (*) on the physical package denote s vde 0884 approval for 560 v peak working voltage.
adm2483 rev. 0 | page 8 of 2 0 pin conf igurations and f u ncti on descriptions 04736-002 nc = no connect adm2483 top view (not to scale) v dd1 1 v dd2 16 gnd 1 * 2 gnd 2 * 15 rxd 3 nc 14 re 4 b 13 de 5 a 12 txd 6 nc 11 pv 7 nc 10 gnd 1 * 8 gnd 2 * 9 * pins 2 and 8 are internally connected. either or both may be used for gnd 1 . pins 9 and 15 are internally connected. either or both may be used for gnd 2 . f i gure 2. pin config ur ation ta ble 8. pi n f u nct i on d e s c ri pt i o ns pin no. mnemonic description 1 v dd1 pow e r suppl y (logic side). 2, 8 gnd 1 ground (logic s i de). 3 rx d receiver output data. this output is high when (a ? b) > 200 m v , and low whe n (a ? b) < ?200 mv. there is tristate output when the receiver is disabled, i.e., whe n re is driven high. 4 re receiver enable input. this is an active-low inp ut. driving this input low enables the receiver, a n d driving it high disables the recei ver. 5 de driver enable input. driving th is input high enables the driver, and driving it low disable s the driver. 6 tx d transmit data input. data to be transmitted by the dri ver is applied to this input. 7 pv power valid. used during power-up and power- d own. see the applic ations infor m ation section. 9, 15 gnd 2 ground (bus sid e ). 10, 14 nc no connect. 1 2 a noninverting dr iver output/receiver inp ut. when the driver is disabled, or v dd1 or v dd2 is powere d down, pin a is p ut in a high impedance state to avoid overl o adi n g the bus. 13 b inverting driver output/ receiver input. 1 6 v dd2 pow e r suppl y (bus side).
adm2483 rev. 0 | page 9 of 2 0 test circuits 04736-003 v od v oc r r f i gure 3. d r iver v o l t age me asurem ent 04736-004 v od3 375 ? 375 ? 60 ? v tst f i gure 4. d r iver v o l t age me asurem ent a b r ldiff 04736- 005 c l1 c l2 f i g u re 5. d r iver p r o p ag at i o n d e l a y a s1 r l 0v or 3 v b 04736-006 de in de s2 v cc c l v out f i g u re 6. d r iver e n abl e /d is abl e a 04736-007 b v out c l re f i gure 7. r eceive r pr op agati o n d e l a y c l v out r l s2 v cc +1.5v 04736-008 s1 ?1.5v re in re f i gure 8. r eceive r e n abl e /d isab le
adm2483 rev. 0 | page 10 of 20 switching characteristics 04736-009 t plh v dd1 0v b a vo 0v ?v o 0.5v dd1 0.5v dd1 t skew = | t plh ? t phl | t f 10% point 10% point 90% point 90% point 1/2vo t r t phl vo f i g u re 9. d r iver p r o p ag at i o n d e l a y , r i s e /f a ll ti mi ng 04736-010 v oh 0v 0v 1.5v 1.5v v ol a? b rxd t plh t phl t skew = | t plh ? t phl | f i g u re 10. r e c e iver p r op ag at ion d e l a y 04736-011 de 2.3v 0.5v dd1 v oh 0v v ol v oh ? 0.5v 0.7v dd1 0.3v dd1 v ol +0.5v 0.5v dd1 2.3v a, b a, b t zl t zh t lz t hz f i g u re 11. d r iver e n abl e /d is abl e ti min g 04736-012 v oh v ol v oh ?0.5v 0.7v dd1 0.3v dd1 v ol +0.5v re rxd rxd 0v o/p low o/p high 1.5v 0.5v dd1 1.5v t zl t zh 0.5v dd1 t lz t hz f i g u re 12. r e c e iver e n able /d is abl e ti ming
adm2483 rev. 0 | page 11 of 20 typical perf orm ance cha r acte ristics 1.6 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 +85 +25 ?40 04736-038 temperature ( c) (ma) i dd1 _rcvr_enable @ 5.5v i dd2 _de_enable @ 5.5v f i g u re 13. u n l oad e d sup p ly cur r ent v s . t e mpe r at u r e 120 100 80 60 40 20 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 04736-014 output voltage (v) outp ut curre nt (ma) f i gure 14. o u tput current v s . d r ive r o u t p ut l o w v o lt ag e ?10 ?30 ?50 ?70 ?90 ?110 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 04736-015 output voltage (v) outp ut curre nt (ma) f i gure 15. o u tput current v s . d r ive r o u t p ut hig h v o lt ag e 0.32 0.30 0.28 0.26 0.24 0.22 0.20 ?40 8 0 65 50 35 20 5 ?1 0 ?2 5 04736-031 temperature ( c) output voltage (v) f i gure 16. r e c e iver o u tput l o w v o lt ag e v s . t e mper ature , i = -4 ma 4.78 4.76 4.74 4.72 4.70 4.68 4.66 ?40 8 0 65 50 35 20 5 ?1 0 ?2 5 04736-032 temperature ( c) output voltage (v) f i gure 17. r e c e iver o u tput high v o lt a g e v s . t e mper ature , i = 4 ma 90 0 10 20 30 40 50 60 70 80 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 04736-013 differential output voltage (v) dri v e r outp ut curre nt (ma) f i gure 18. d r iver o u tput current vs . diffe r e ntia l output v o l t a g e
adm2483 rev. 0 | page 12 of 20 460 440 420 400 380 360 340 +85 +25 ?40 04736-034 temperature ( c) time (ns) t p_alh @ v dd1 = v dd2 = 5.0v t p_ahl @ v dd1 = v dd2 = 5.0v t p_blh @ v dd1 = v dd2 = 5.0v t p_bhl @ v dd1 = v dd2 = 5.0v f i g u re 19. d r iver propag at io n d e lay v s . t e mper at ure 800 0 100 200 300 400 500 600 700 +85 +25 ?40 04736-035 temperature ( c) time (ns) r cvr prop hl/v dd1 = v dd2 = 5.0v r cvr prop lh/v dd1 = v dd2 = 5.0v f i g u re 20. r e c e iver p r op ag at ion d e l a y v s . t e mper at ur e 04736-022 ch1 5.00v ch2 2.00v ch3 2.00v ch4 5.00v m2.00ns a ch1 2.50v 1 3 4 t 2.41200 s f i g u re 21. d r iver/r ec e i ver pr op ag at io n d e l a y h i g h t o l o w 04736-023 ch1 5.00v ch2 1.00v ch3 1.00v ch4 5.00v m2.00ns a ch1 2.50v 1 3 4 t 492.000ns f i g u re 22. d r iver/r ec e i ver pr op ag at io n d e l a y l o w to h i g h
adm2483 rev. 0 | page 13 of 20 350 300 250 200 150 100 50 0 0 5 0 100 150 200 04736-024 case temperature ( c) s a fe ty -limiting curre nt (ma) bus side logic side f i g u re 23. the r m a l d e r a t i ng cur v e , d e pendence of s a f e t y -lim it ing v a lu es with case t e mper a t ur e per vde 08 8 4 0 ?30 ?25 ?20 ?15 ?10 ?5 5.0 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 04736-036 output voltage (v) outp ut curre nt (ma) f i gure 24. o u tput current v s . r e c e ive r o u tput high v o lt a g e 35 0 5 10 15 20 25 30 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0 04736-037 output voltage (v) outp ut curre nt (ma) f i gure 25. o u tput current v s . r e c e ive r o u tput l o w v o lt ag e
adm2483 rev. 0 | page 14 of 20 circuit description electrical isolation i n t h e ad m248 3, e l e c t r ic a l is ol a t io n is im ple m en t e d o n t h e log i c side o f t h e in t e r f ace . ther efo r e , t h e p a r t has tw o ma i n s e c t io n s : a d i g i t a l is ola t io n s e c t i o n a nd a t r an s c ei ver s e c t ion (s e e f i gur e 19). dr i v er in p u t a nd da t a ena b le s i g n als, a p plie d t o t h e t x d a n d de p i ns re sp e c t i v e ly , an d re f e re nc e d t o l o g i c g r ou nd (gnd 1 ) , are c o upl e d a c ro ss an i s ol a t i o n b a r r i e r to a p p e ar a t t h e t r a n s c ei ver s e c t i o n r e fer e n c e d to is ola t e d g r o u nd (gn d 2 ). simi la rl y , t h e r e cei v er o u t p u t , refer e n c e d t o is ola t e d g r o u n d in t h e t r an s c e i v e r s e c t io n, is cou p le d acr o ss t h e is ola t io n b a r r i er to a p p e a r a t t h e rx d p i n r e fer e nce d to lo g i c g r o u nd . i coupler tech nology the dig i t a l sig n als a r e tra n smi t te d acr o s s t h e is ola t io n ba r r ier usin g i c o u p l e r te chnol o g y . this te chniq u e u s es chi p s c a l e tra n sfo r m e r windin g s t o co u p le the dig i t a l sig n als ma g n etical l y f r o m o n e side of t h e b a r r ier t o t h e o t h e r . d i g i t a l in p u ts a r e en co de d in t o w a v e fo r m s t h a t a r e ca p a b l e o f exci t i n g t h e p r ima r y t r a n sfo r m e r w i n d ing. a t t h e s e conda r y wi nding, t h e ind u ce d w a vefo r m s a r e t h e n de co de d in to t h e b i na r y va l u e t h a t was o r ig ina l ly t r a n smi t t e d . 04736-025 re txd decode encode de decode encode rxd decode encode isolation barrier digital isolation transceiver d r a v dd1 v dd2 gnd 1 gnd 2 b f i g u re 26. a d m 2 48 3 d i g i t a l is o l at io n and t r a n s c eive r s e c t ions
adm2483 rev. 0 | page 15 of 20 truth t a bles the fol l o w in g t r u t h t a b l es us e t h es e a b b r e v ia t i o n s: l e t t e r d e s c r i p t i o n h h i g h l e v e l l l o w l e v e l x i r r e l e v a n t z high impedance (off) nc disconnected table 9.tra n smitting supply stat us i n p u t s o u t p u t s v dd1 v dd2 d e t x d a b o n o n h h h l o n o n h l l h o n o n l x z z o n o f f x x z z o f f o n x x z z o f f o f f x x z z table 10. receiv in g supply stat us i n p u t s o u t p u t s v dd1 v dd2 a ? b ( v ) re rxd on on >?0.03 l or nc h on on adm2483 rev. 0 | page 16 of 20 100 10 1 0.1 0.01 0.001 1k 10k 100k 1m 10m 100m 04736-027 magnetic field frequency (hz) max i mum allo wable mag n e t i c flu x d e n s ity ( k ga u ss) f i g u re 27. m a x i mu m a l lo wab l e e x t e rn al m a g n et ic flux d e ns it y f o r e x am pl e, a t a mag n e t i c f i el d f r e q u e nc y of 1 m h z, t h e maxim u m al lo wa b l e ma g n et ic f i e l d o f 0.2 kga u s s ind u ces a v o l t a g e o f 0.25 v a t t h e r e cei v in g co il . this is abo u t 50 % o f t h e se n s i n g th r e sh old a n d doe s n o t ca use a fa ul t y o u t p u t tra n si ti o n . s i m i l a r l y , i f s u ch a n ev e n t occurr ed d u ri n g a tra n s m i t t e d p u l s e a nd was o f t h e w o rst-ca s e p o lar i ty , i t w o u l d r e d u ce t h e r e ce i v e d p u ls e f r o m >1.0 v t o 0.75 v . this w o u l d b e w e l l a b o v e t h e 0.5 v s e n s in g t h r e sh o l d o f t h e de co de r . a s a con v e n ie n c e t o t h e us er , t h es e ma g n et ic f l ux den s i t y val u es are sh ow n i n fi g u re 2 8 , u s i n g more f a m i l i ar qu an t i t i e s su ch a s m a x i mu m a l l o w a b l e c u r r e n t f l ow , at g i v e n d i s t a n c e s aw ay f r o m th e ad m2483 t r a n sf o r m e rs. 1000 100 0.1 1 10 0.01 1k 10k 100k 1m 10m 100m 04736-028 magnetic field frequency (hz) max i mum allowable curre nt (k a) distance = 1m distance = 5mm distance = 100mm f i gure 28. maxi mu m a l lo w a b l e cu rre nt for v a r i ous current-to - a d m 2 4 83 spa c ings n o t e t h at at c o m b i n at i o n s o f s t r o n g m a g n e t i c f i e l d a n d h i g h f r eq ue n c y , a n y loo p s f o rm ed b y p r i n t e d ci r c ui t boa r d tra c e s co u l d i n d u ce la rg e en o u g h er r o r v o l t a g es t o t r ig g e r t h e t h re shol ds of su c c e e d i n g c i rc u i t r y . t o a v oid t h is p o ss ibi l ity , b e ca r e f u l in t h e l a yo u t o f s u c h traces.
adm2483 rev. 0 | page 17 of 20 appli c ations inf ormati o n power_valid input t o a v oi d g l itc h e s on output s a a n d b c a u s e d b y sl o w p o we r - up a nd p o w e r - do w n t r a n sie n ts o n v dd 1 (>100 s/v), t h e ad m24 83 f e a t ur es a p o w e r_valid (p v) dig i tal in p u t. this p i n sh o u l d be dr i v en lo w un t i l v dd 1 e x ceed s 2. 0 v . w h en v dd 1 is g r e a t e r t h a n 2.0 v , t h e p i n sho u ld be dr i v en hig h . c o n v ers e ly , u p o n p o w e r - do wn, t h e pv sh o u ld b e dr i v e n lo w b e fo r e v dd 1 r e ac h e s 2.0 v . the p o wer_vali d i n p u t ca n b e dr i v en, fo r exa m ple , b y t h e o u t p u t o f a sys t em r e s e t c i r c ui t s u c h as t h e ad m809z, whic h has a thr e sh old v o l t a g e o f 2.32 v . 04736-029 v dd1 2.32v t por 2.0v 2.32v 2.0v reset reset adm809z adm2483 v dd1 pv gnd 1 v dd1 f i g u re 29. d r iv ing pv w i t h a d m 8 09z isolated power supply circuit the ad m 248 3 r e q u ires is ol a t e d p o wer ca p a b l e o f 5 v a t 1 0 0 ma, t o be su p p lie d b e tw een v dd 2 a nd gn d 2 pi ns . i f no su i t abl e in te g r a t e d p o we r su p p ly is a v ai l a bl e, t h e n a dis c re te c i rc u i t, su c h a s th e o n e in f i gu r e 2 5 , ca n be used . a cen t e r ta p p ed tra n s f o r m e r p r o v ide s e l e c t r i c a l is ol a t ion. t h e p r ima r y wi ndi n g is exci t e d wi th a p a ir o f s q ua r e wa v e f o r m s tha t a r e 180 ou t o f p h as e wi t h e a ch ot he r . a p a i r of s c hot t ky d i o d e s a n d a s m o o t h i n g c a p a c i tor a r e us e d to cr e a te a r e c t if ie d sig n a l f r o m t h e s e c o nda r y wi ndi n g . the ad p667 l i n e a r v o l t a g e r e g u la t o r p r o v ides a r e gu la t e d p o w e r s u p p l y t o th e ad m2483 s b u s-side c i r c ui t r y . t o cr ea t e t h e p a ir o f s q ua r e wa ves, a d-typ e f l i p -f lo p wi t h co m p lem e n t a r y q/ q output s i s u s e d . t h e f l ip - f l o p c a n b e co nn e c te d s o t h a t o u t p u t q fol l o w s t h e clo c k i n p u t sig n a l . i f n o lo cal c l o c k s i g n al is a v ailab l e , t h e n a sim p le dig i tal os cil l a t o r ma y b e i m ple m en t e d wi t h a h e x in v e r t in g s c h m i t t t r ig ger an d r e sis t o r a n d ca p a ci t o r . i n this cas e , val u es o f 3.9 kv an d 1 nf g e n e ra t e a 364 kh z s q ua r e wa v e . a p a ir o f dis c r e t e nm os tra n sis t o r s, swi t c h e d b y t h e q / q fl i p - f l o p o u t p u t s , c o n d u c t curr e n t th r o ugh th e ce n t e r ta p o f th e p r im a r y tr a n sf o r m e r wi ndi n g i n a n a l ter n a t i n g fashion. 04736-030 3.9k ? 100nf 10nf 74hc14 v cc 74hc74a pr clr dq clk q bs107a bs107a v cc isolation barrier sd103c 22 f sd103c 78253 100nf v cc in out 5v set shdn gnd adp667 v dd1 v dd2 gnd 1 gnd 2 adm2483 v cc f i gure 30. is ol ated p o w e r su p p ly c i rcu i t
adm2483 rev. 0 | page 18 of 20 outline dimensions controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design compliant to jedec standards ms-013aa seating plane 0.30 (0.0118) 0.10 (0.0039) 0.51 (0.0201) 0.31 (0.0122) 2.65 (0.1043) 2.35 (0.0925) 1.27 (0.0500) bsc 16 9 8 1 10.65 (0.4193) 10.00 (0.3937) 7.60 (0.2992) 7.40 (0.2913) 10.50 (0.4134) 10.10 (0.3976) 8 0 0.75 (0.0295) 0.25 (0.0098) 45 1.27 (0.0500) 0.40 (0.0157) 0.33 (0.0130) 0.20 (0.0079) coplanarity 0.10 f i gure 31. 16-l ead standar d s m all o u tline p a ck age [s oi c ] w i de body (r w - 16) di me nsio ns sho w n i n mi ll im e t e r s a n d (i nc he s) ordering guide model data rat e (kbp s) temperature r a nge package descri ption package option adm2483brw 500 ?40c to +85c 16-lead wide b o dy soic rw-16 adm2483brw- r eel 1 500 ?40c to +85c 16-lead wide b o dy soic rw-16 1 the addition of a - r eel suffix designates a 13-inch (1000 units) tape-and-reel option.
adm2483 rev. 0 | page 19 of 20 notes
adm2483 rev. 0 | page 20 of 20 notes ? 2004 anal og de vices, inc. all rights reserve d . tr adem arks an d registered tra d em ar ks are the prop ert y of their respective owne rs. d04736-0-10/04(0)

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