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5 kv rms signal isolated high speed can transceiver with bus protection data sheet ADM3054 rev. 0 information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights o f third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of t heir respective owners. one technology way, p.o. box 9106, norwood, ma 02062 - 9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ? 2011 analog devices, inc. all rights reserved. features 5 kv rms signal isolated can transceiver 5 v or 3.3 v operation on v dd1 5 v operation on v dd2 v dd2s ense to detect loss of power on v dd2 complies with iso 11898 standard high s peed d ata r ates of up to 1 mbps short - circuit protection on canh and canl against shorts to power/ground in 24 v systems unpowered n odes do not disturb the bus connect 110 or more nodes on the bus thermal shutdown protection high common - mode transient immunity: >25 kv/s safety and regulatory approvals ul recognition (pending) 5000 v rms for 1 minute per ul 1577 vde certificates of conformity (pending) din v vde v 0884 - 10 (vde v 0884 - 10): 2006 - 12 v iorm = 84 6 v peak industrial operating temperature range: ? 40 c to + 125c w ide - body, 16 - lead soic package applications can data buses industrial field networks general description the ADM3054 is a 5 kv rms signal isolated controller area network (can) physical layer transcei ver . the ADM3054 complies with the iso 11898 standard. the device employs analog devices, inc., i coupler? technology to combine a 3 - channel isolator and a can transceiver into a single package. the logic side of the device is powered with a single 3.3 v or 5 v supply on v dd1 and the bus side uses a single 5 v supply on v dd2 only . loss of power on the bus side (v dd2 ) can be detected by an integrated v dd2 sense signal. the ADM3054 creates an isolated interface between the can protocol controller and the physical layer bus. it is capable of running at data rates of up to 1 mbps. the device has integrated protection on the bus pins, canh and canl against shorts to power/grou nd in 24 v systems . the device has current - limiting and thermal shutdown features to protect against output short circuits and situations where the bus might be shorted to ground or power terminals. the part is fully specified over the industrial temperatu re range and is available in a 16 - lead, wide - body soic package. functional block dia gram figure 1 t xd rxd isol a tion barrier gnd 1 decode decode decode v dd2sense encode encode encode v ref v dd1 ADM3054 voltage reference can transceiver logic side bus side v dd2 can l canh digital isolation i coupler ? r d v dd2 vo lt age sense thermal shutdown gnd 2 10274-001 www.datasheet.co.kr datasheet pdf - http://www..net/
ADM3054 data sheet rev. 0 | page 2 of 20 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 general description ......................................................................... 1 functional block diagram .............................................................. 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 timing specifications .................................................................. 4 regulatory information ............................................................... 5 insulation and safety - related specifications ............................ 5 vde 0884 insulation characteristics (pending) ...................... 6 absolute maximum ratings ....................................................... 7 esd caution .................................................................................. 7 pin configuration and function descriptions ............................. 8 typical performance characteristics ..............................................9 test circuits and switching characteristics ................................ 13 theory of operation ...................................................................... 15 can transceiver operation ..................................................... 15 thermal shutdown .................................................................... 15 truth tables ................................................................................. 15 electrical isolation ...................................................................... 16 magnetic field immunity ......................................................... 17 applications information .............................................................. 18 typical applications ................................................................... 18 packaging and ordering informati on ......................................... 20 outline dimensions ................................................................... 20 ordering guide .......................................................................... 20 revision history 10/ 11 rev ision 0: initial version www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADM3054 rev. 0 | page 3 of 20 specifications each voltage is relative to its respective ground , 3.0 v v dd1 5.5 v, t a = ?40c to +125c, 4.75 v v dd2 5.25 v, unless otherwise noted. table 1 . parameter symbol min typ max unit test conditions/comments supply current power supply current logic side txd / rxd data rate 1 mbps i dd1 2.5 3.0 ma power supply current bus side i dd2 recessive state 10 ma r l = 60 ?, see figure 28 dominant state 75 ma r l = 60 ?, see figure 28 txd/rxd data rate 1 mbps 55 ma r l = 60 ?, see figure 28 driver logic inputs input voltage high v ih 0.7 v dd1 v txd input voltage low v il 0.25 v dd1 v txd cmos logic input currents i ih , i il 500 a txd differential outputs recessive bus voltage v canl , v canh 2.0 3.0 v v txd = high, r l = , see figure 22 canh output voltage v canh 2.75 4.5 v v txd = low, see figure 22 canl output voltage v canl 0.5 2.0 v v txd = low, see figure 22 differential output voltage v od 1.5 3.0 v v txd = low, r l = 45 ? , see figure 22 v od ? 500 +50 mv v txd = high, r l = , see figure 22 short - circuit cur rent , canh i sccanh ? 200 ma v canh = ?5 v i sccanh ? 100 ma v canh = ?36 v short - circuit current , canl i sccanl 200 ma v canl = 36 v receiver differential inputs differential input voltage recessive v idr ? 1.0 +0.5 v ? 2 v < v canl , v canh < 7 v, see figure 24, c l = 15 pf ? 1.0 +0.4 v ? 7 v < v canl , v canh < 12 v, see figure 24, c l = 15 pf differential input voltage dominant v idd 0.9 5.0 v ? 2 v < v canl , v canh < 7 v, see figure 24, c l = 15 pf 1.0 5.0 v ? 7 v < v canl , v canh < 12 v, see figure 24, c l = 15 pf input voltage hysteresis v hys 150 mv see figure 25 canh, canl input resistance r in 5 25 k ? differential input resistance r diff 20 100 k ? logic outputs output voltage low v ol 0.2 0.4 v i out = 1.5 ma output voltage high v oh v dd1 ? 0.3 v dd1 ? 0.2 v i out = ?1.5 ma short - circuit current i os 7 85 ma v out = gnd 1 or v dd1 voltage reference reference output voltage v ref 2.025 3.025 v |i ref = 50 a| v dd2 voltage sense v dd2sense output voltage low v ol 0.2 0.4 v i osense = 1.5 ma v dd2sense output voltage high v oh v dd1 ? 0.3 v dd1 ? 0.2 v i osense = ?1.5 ma bus voltage sense threshold voltage v th(sense) 2.0 2.5 v v dd2 common - mode transient immunity 1 25 kv/s v cm = 1 kv, transient, magnitude = 800 v 1 cm is the maximum common - mode voltage slew rate that can be sustained while maintaining specification 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 common mode is slewed. the common - mode voltage slew rates apply to both rising and falling common - mode voltage edges. www.datasheet.co.kr datasheet pdf - http://www..net/
ADM3054 data sheet rev. 0 | page 4 of 20 timing specification s each voltage is relative to its respective ground , 3.0 v v dd1 5.5 v. t a = ?40c to +125c, 4.75 v v dd2 5.25 v, unless otherwise noted. table 2 . parameter symbol min typ max unit test conditions/comments driver maximum d ata r ate 1 mbps propagation d elay txd o n to bus active t on txd 90 ns r l = 60 ?, c l = 100 pf , s ee figure 23 and figure 27 propagation d elay txd off to bus inactive t off txd 120 ns r l = 60 ?, c l = 100 pf , s ee figure 23 and figure 27 receiver propagation d elay txd on to receiver active t on rxd 200 ns r l = 60 ?, c l = 100 pf , s ee figure 23 and figure 27 propagation d elay txd off to receiver inactive t off rxd 250 ns r l = 60 ?, c l = 100 pf , s ee figure 23 and figure 27 power -up enable time, v dd2 high to v dd2s ense low t se 300 s see figure 26 disable time, v dd2 low to v dd2s ense high t sd 10 ms see figure 26 www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADM3054 rev. 0 | page 5 of 20 regulatory informati on (pending) table 3 . ADM3054 approvals (pending) organization approval type notes ul to be r ecognized under the component recognition program of u nderwriters l aboratories, inc. in accordance with ul 1577, each ADM3054 is proof tested by applying an insulation test voltage 6000 v rms for 1 second vde to be c ertified according to din v vde v 0884 - 10 (vde v 0884 - 10): 2006 - 12 in accordance with din v vde v 0884 - 10, each ADM3054 is proof tested by applying an insulation test voltage 1590 v peak for 1 second (partial discharge detection limit = 5 pc) insulation and safet y - related specificatio ns table 4 . parameter symbol value unit conditions rated dielectric insulation voltage 5000 v rms 1 - minute duration minimum external air gap (external clearance) l(i01) 8.0 mm measured from input terminals to output terminals, shortest distance through air minimum external tracking (creepage) l(i02) 7.6 mm measured from input terminals to output terminals, shortest distance 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 - 1 isolation group iiia material group (din vde 0110) www.datasheet.co.kr datasheet pdf - http://www..net/
ADM3054 data sheet rev. 0 | page 6 of 20 vde 0884 insulation characteristics (p ending ) this isolator is suitable for reinforced electrical isolation only within the safety limit data. maintenance of the safety data must be ensured by means of protective circuits. table 5 . description test conditions/comments symbol characteristic unit classifications installation classification per din vde 0110 for rated mains voltage 150 v rms i to iv 300 v rms i to iii 400 v rms i to ii climatic classification 40/125/21 pollution degree din vde 0110 2 v o ltage maximum working insulation voltage v iorm 846 v peak input - to - output test voltage, method b1 v iorm 1.875 = v pr , 100% production tested, t m = 1 sec, partial discharge < 5 pc v pr 1590 v peak input - to - output test voltage, method a after environmental tests, subgroup 1 v iorm 1.6 = v pr , t m = 60 sec, partial discharge < 5 pc v pr 1357 v peak after input and/or safety test, subgroup 2/subgroup 3): v iorm 1.2 = v pr , t m = 60 sec, partial discharge < 5 pc v pr 1018 v peak highest allowable overvoltage v tr 6000 v peak safety limiting values 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 r s >10 9 ? www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADM3054 rev. 0 | page 7 of 20 absolute maximum rat ings t a = 25c, unless otherwise noted. each voltage is relative to its respective ground. table 6 . parameter rating v dd1 , v dd2 ? 0.5 v to +6 v digital input voltage txd ? 0.5 v to v dd1 + 0.5 v digital output voltage rxd ? 0.5 v to v dd1 + 0.5 v v dd2sense ? 0.5 v to v dd1 + 0.5 v canh, canl ? 36 v to +36 v v ref ? 0.5 v to +6 v operating temperature range ? 40c to + 125c storage temperature range ? 55c to +150c esd (human body model) 3.5 kv lead temperature soldering (10 sec) 300c vapor phase (60 sec) 215c infrared (15 sec) 220c ja thermal impedance 53c/w t j junction temperature 15 0c esd caution s t r e s s es a b o ve t h o s e l i s t e d u n d e r a b s o l u t e m a x i m um r a t i n gs m a y c a u s e p e r m a n e n t dam a g e t o t h e d e v i c e . this is a s t r e s s r a t i n g o n l y ; fu n c t i o n a l o p e r a t i o n o f t h e d ev i c e a t t h e s e o r a n y o t h e r co n d i t i o ns a b o ve t h o s e indi c a t e d i n t h e o p e r a t i o na l s e c t i o n o f t h is s p e c i fi c a t ion is n o t i m p l i e d . e x p o su r e t o a b s o l u te ma x i m u m r a t in g c o n d i t i o n s fo r e x t e n d e d p e r i o d s m a y a ff e c t d e vi c e r e l i a b i l i t y . www.datasheet.co.kr datasheet pdf - http://www..net/
ADM3054 data sheet rev. 0 | page 8 of 20 pin configuration an d function descripti ons figure 2 . pin configuration table 7 . pin function descriptions pin no. mnemonic description 1 nc no connect. this pin remains unconnected. 2 gnd 1 ground ( logic side ) . 3 gnd 1 ground ( logic side ) . 4 v dd2s ense v dd2 voltage sense. a l ow l evel on v dd2s ense indicates that p ower is connected on v dd2 . a h igh l evel on v dd2s ense indicates a loss of power on v dd2 . 5 rxd receiver output data. 6 txd driver input data. 7 v dd1 power supply (logic s ide ); 3.3 v or 5 v. a d ecoupling capacitor to gnd 1 is required; a capacitor value between 0.01 f and 0.1 f is recommended . 8 gnd 1 ground ( logic side ) . 9 gnd 2 ground ( bus side ) . 10 v ref reference v oltage o utput. 11 canl low level can voltage input/output . 12 canh high level can voltage input/output . 13 v dd2 power supply ( bus side); 5 v. a d ecoupling capacitor to gnd 2 is required ; a capacitor value of 0.1 f is recommended . 14 nc no connect. this pin remains unconnected. 15 nc no connect. this pin remains unconnected. 16 gnd 2 ground ( bus side ) . nc 1 gnd 1 2 gnd 1 3 v dd2sense 4 gnd 2 16 nc 15 nc 14 v dd2 13 rxd 5 canh 12 txd 6 can l 1 1 v dd1 7 v ref 10 gnd 1 8 gnd 2 9 notes 1. nc = no connec t . ADM3054 t op view (not to scale) 10274-009 www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADM3054 rev. 0 | page 9 of 20 typical performance characteristics figure 3 . propagation delay from txd on to receiver active vs. temperature figure 4 . propagation delay from txd on to receiver active vs. supply voltage, v dd2 figure 5 . propagation delay from txd off to receiver inactive vs. temperature figure 6 . propagation delay from txd off to receiver inactive vs. supply voltage, v dd2 figure 7 . receiver input hysteresis vs. temperature figure 8 . propagation delay from txd off to bus inactive vs. temperature 140 145 150 155 160 165 170 ?50 ?25 0 25 50 75 100 125 pro p ag a tion del a y txd on t o receiver active, t onrxd (ns) temper a ture ( c) v dd1 = 3.3v, v dd2 = 5v v dd1 = 5v, v dd2 = 5v 10274-010 pro p ag a tion del a y txd on t o receiver active, t onrxd (ns) 146 147 148 149 150 151 152 153 154 155 4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 supp l y vo lt age, v dd2 (v) v dd1 = 3.3v, t a = 25c v dd1 = 5v, t a = 25c 10274-0 1 1 temper a ture ( c) 170 180 190 200 210 220 230 240 250 ?50 ?25 0 25 50 75 100 125 pro p ag a tion del a y txd off t o receiver inactive, t offrxd (ns) v dd1 = 3.3v, v dd2 = 5v v dd1 = 5v, v dd2 = 5v 10274-012 180 185 190 195 200 205 4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 pro p ag a tion del a y txd off t o receiver inactive, t offrxd (ns) supp l y vo lt age, v dd2 (v) v dd1 = 3.3v, t a = 25c v dd1 = 5v, t a = 25c 10274-013 146 147 148 149 150 151 152 153 154 155 156 ?50 ?25 0 25 50 75 100 125 receiver input vo lt age hysteresis, v hys (v) temper a ture (c) v dd1 = 3.3v, v dd2 = 5v v dd1 = 5v, v dd2 = 5v 10274-014 60 65 70 75 80 85 90 ?50 ?25 0 25 50 75 100 125 pro p ag a tion del a y txd off t o bus inactive, t offtxd (ns) temper a ture (c) v dd1 = 3.3v, v dd2 = 5v v dd1 = 5v, v dd2 = 5v 10274-015 www.datasheet.co.kr datasheet pdf - http://www..net/
ADM3054 data sheet rev. 0 | page 10 of 20 figure 9 . propagation delay from txd off to bus inactive vs. supply voltage, v dd2 figure 10 . propagation delay from txd on to bus active vs. temperature figure 11 . propagation delay from txd on to bus active vs. supply voltage, v dd2 figure 12 . supply current (i dd2 ) vs. data rate figure 13 . supply current (i dd1 ) vs. data rate figure 14 . driver differential output voltage dominant vs. temperature 71 72 73 74 75 76 77 78 4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 pro p ag a tion del a y txd off t o bus inactive, t offtxd (ns) supp l y vo lt age, v dd2 (v) v dd1 = 3.3v, t a = 25c v dd1 = 5v, t a = 25c 10274-016 40 42 44 46 48 50 52 54 ?50 ?25 0 25 50 75 100 125 pro p ag a tion del a y txd on t o bus active, t ontxd (ns) temper a ture (c) v dd1 = 3.3v, v dd2 = 5v v dd1 = 5v, v dd2 = 5v 10274-017 42 43 44 45 46 47 48 49 50 4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 pro p ag a tion del a y txd on t o bus active, t ontxd (ns) v dd1 = 3.3v, t a = 25c v dd1 = 5v, t a = 25c supply voltage, v dd2 (v) 10274-018 34 35 36 37 38 39 40 41 42 100 1000 supp l y curren t , i dd2 (ma) dat a r a te (kbps) v dd1 = 3.3v, v dd2 = 5v v dd1 = 5v, v dd2 = 5v 10274-019 0 0.2 0.4 0.6 0.8 1.0 1.2 100 1000 supp l y curren t , i dd1 (ma) dat a r a te (kbps) v dd1 = 3.3v, v dd2 = 5v v dd1 = 5v, v dd2 = 5v 10274-020 2.10 2.15 2.20 2.25 2.30 2.35 ?50 ?25 0 25 50 75 100 125 differentia l output vo lt age dominan t , v od (v) temper a ture (c) v dd1 = 5v, v dd2 = 5v, r l = 45 v dd1 = 5v, v dd2 = 5v, r l = 60 10274-021 www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADM3054 rev. 0 | page 11 of 20 figure 15 . driver differential output voltage dominant vs. supply voltage, v dd2 figure 16 . receiver output high voltage vs. temperature figure 17 . receiver output low voltage vs. temperature figure 18 . v ref vs. temperature 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 differentia l output vo lt age dominan t , v od (v) supp l y vo lt age, v dd2 (v) v dd1 = 5v, v dd2 = 5v, r l = 45 v dd1 = 5v, v dd2 = 5v, r l = 60 10274-022 4.84 4.85 4.86 4.87 4.88 4.89 4.90 ?50 ?25 0 25 50 75 100 125 receiver output vo lt age high, v oh (v) temper a ture (c) v dd1 = 5v, v dd2 = 5v 10274-023 80 90 100 1 10 120 130 140 ?50 ?25 0 25 50 75 100 125 receiver output vo lt age lo w , v ol (mv) temper a ture (c) v dd1 = 3.3v, v dd2 = 5v v dd1 = 5v, v dd2 = 5v 10274-024 temper a ture (c) 2.35 2.40 2.45 2.50 2.55 2.60 2.65 2.70 ?50 ?25 0 25 50 75 100 125 reference vo lt age, v ref (v) v dd1 = 5v, v dd2 = 5v, i ref = +50a v dd1 = 5v, v dd2 = 5v, i ref = C50a 10274-025 www.datasheet.co.kr datasheet pdf - http://www..net/
ADM3054 data sheet rev. 0 | page 12 of 20 figure 19 . enable time, v dd2 high to v dd2sense low vs. temperature figure 20 . disable time, v dd2 low to v dd2sense high vs. temperature figure 21 . v dd2 voltage sense threshold voltage high to low vs. temperature 128 130 132 134 136 138 140 142 144 146 ?50 ?25 0 25 50 75 100 125 temper a ture (c) v dd2sense enable time, t se (ns) v dd1 = 5v, v dd2 = 5v 10274-026 182 184 186 188 190 192 194 196 198 200 ?50 ?25 0 25 50 75 100 125 v dd2sense disable time, t sd (ns) v dd1 = 5v, v dd2 = 5v temper a ture (c) 10274-027 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.40 2.42 ?50 ?25 0 25 50 75 100 125 v dd2sense threshold vo lt age high t o lo w , v th (sense) (v) v dd1 = 5v, v dd2 = 5v temper a ture (c) 10274-028 www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADM3054 rev. 0 | page 13 of 20 test circuits and sw itching characterist ics figure 22 . driver voltage measurement figure 23 . switching characteristics measurements figure 24 . receiver voltage measurements figure 25 . receiver input hysteresis figure 26 . v dd2sense enable/disable time v oc v od v can l v canh r l 2 r l 2 txd 10274-006 canh canl txd rxd c l r l 15pf 10274-003 c l rxd canh v id can l 10274-002 0.5 0.9 v rxd high low v hys v id (v) 10274-004 v dd2sense v th(sense) v th(sense) t se 0.4v v dd1 ? 0.3 t sd 0v v dd1 10274-005 0v 5v v dd2 www.datasheet.co.kr datasheet pdf - http://www..net/
ADM3054 data sheet rev. 0 | page 14 of 20 figure 27 . driver and receiver propagation delay figure 28 . supply current measurement test circuit 0.25v dd1 0.9v v or v od 0v 0v v dd1 0.5v 0.4v cc v diff v rxd v dd1 v txd v dd1 ? 0.3v 0.7v dd1 v diff = v canh ? v canl t ontxd t offtxd t onrxd t offrxd 10274-007 t xd rxd isol a tion barrier gnd 1 decode decode decode v dd2sense encode encode encode v dd1 ADM3054 voltage reference can transceiver logic side bus side v dd2 v dd2 can l canh 1f digital isolation i coupler ? r d v dd2 vo lt age sense thermal shutdown gnd 2 v ref r l 10274-008 www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADM3054 rev. 0 | page 15 of 20 theory of operation can transceiver oper ation a can bus has two states: dominant and recessive. a dominant state is present on the bus when the differential voltage between canh and canl is greater than 0.9 v. a recessive state is present on the bus when the differential voltage between canh and canl is less than 0.5 v. during a dominant bus state, the canh pin is high and the canl pin is low. during a recessive bus state, both the canh and canl pins are in the high imped - ance state. the driver drive s canh high and canl low (dominant state) when a logic l ow is present on txd . if a logic h igh is present on txd , the driver outputs ar e placed in a high impedance state (recessive state). the driver output states are presented in table 9 . the receiver output is l ow when the bus is in the dominant state and h igh when the bus is in the recessive state. if the differential voltage be tween canh and canl is between 0.5 v and 0.9 v, the bus state is indeterminate and the receiver output can be either high or low. the receiver output states for given inputs are listed in table 10. thermal shutdown the ADM3054 contains thermal shutdown circuitry that protects the part from excessive power dissipation during fault conditions. shorting the driver outputs to a l ow impedance source can result in high driver currents. the thermal sensing circuitry detects the increase in di e temperature under this condition and disables the driver outputs . this circuitry is designed to disable the driver outputs when a junction temperature of 150 c is reached. as t he device cools, the drivers re enable at a temperature of 140c. truth tables the truth tables in this section use the abbreviations listed in table 8 . table 8 . truth table abbreviations letter description h high level l low level i indeterminate x dont c are z high impedance (off ) nc disconnected table 9 . transmitting supply status input outputs v dd1 v dd2 txd state canh canl v dd2 sense on on l dominant h l l on on h recessive z z l on on floating recessive z z l off on x recessive z z i on off l i i i h table 10 . receiving supply status inputs outputs v dd1 v dd2 v id = canh ? canl bus state rxd v dd2 sense on on 0.9 v dominant l l on on 0.5 v recessive h l on on 0.5 v < v id < 0.9 v i i l on on inputs open recessive h l off on x x i i on off x x h h www.datasheet.co.kr datasheet pdf - http://www..net/
ADM3054 data sheet rev. 0 | page 16 of 20 electrical isolation in the ADM3054 , electrical isolation is implemented on the logic side of the interface. therefore, the device has two main sections: a digital isolation section and a transceiver section (see figure 29). the driver input signal, which is applied to the txd pin and referenced to the logic ground (gnd 1 ), is coupled across an isolation barrier to appear at the transceiver section referenced to the isolated ground (gnd 2 ). similarly, the receiver input, which is referenced to the isolated ground in the tran- sceiver section, is coupled across the isolation barrier to appear at the rxd pin referenced to the logic ground. i coupler technology the digital signals transmit across the isolation barrier using i coupler technology. this technique uses chip scale transformer windings to couple the digital signals magnetically from one side of the barrier to the other. digital inputs are encoded into waveforms that are capable of exciting the primary transformer winding. at the secondary winding, the induced waveforms are decoded into the binary value that was originally transmitted. positive and negative logic transitions at the input cause narrow (~1 ns) pulses to be sent to the decoder via the transformer. the decoder is bistable and is, therefore, set or reset by the pulses, indicating input logic transitions. in the absence of logic transitions at the input for more than ~1 s, a periodic set of refresh pulses, indicative of the correct input state, are sent to ensure dc correct- ness at the output. if the decoder receives no internal pulses for more than about 5 s, the input side is assumed to be unpowered or nonfunctional, in which case the output is forced to a default state (see table 9). figure 29. digital isolation and transceiver sections txd rxd isolation barrier gnd 1 decode decode decode v dd2sense encode encode encode v ref v dd1 ADM3054 voltage reference can transceiver logic side bus side v dd2 canl canh digital isolation i coupler ? r d v dd2 voltage sense thermal shutdown gnd 2 10274-029 www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADM3054 rev. 0 | page 17 of 20 magnetic field immun ity the limitation on the magnetic field immunity of the i coupler is set by t he condition in which an induced voltage in the receiving coil of the transformer is large enough to either falsely set or reset the decoder. the following analysis defines the conditions under which this may occur. the 3 v operating condition of the ADM3054 is examined because it represents the most susceptible mode of operation. the pulses at the transformer output have an amplitude greater than 1 v. the decoder has a sensing threshold of about 0.5 v, thus establishing a 0.5 v margin in which induced voltages can be tolerated. the voltage induced across the receiving coil is given by ? ? ? ? ? ? ? = 2 n r dt d v ; n = 1, 2, , n where: is the magnetic flux density (gauss). n is the number of turns in the receiving coil. r n is the radius of t he n th turn in the receiving coil (cm). figure 30 . maximum allowable external magnetic flux density given the geometry of the receiving coil and an imposed requirement that the induced voltage is, at most, 50% of the 0.5 v margin at the decoder, a maximum allowable magnetic field can be determined using figure 30. for example, at a magnetic field frequency of 1 mhz, the maximum allowable magnetic field of 0.2 kgauss induces a voltage of 0.25 v at the receiving coil. this is a pproximately 50% of the sensing thresho ld and does not cause a faulty output transition. similarly, if such an event occurs during a transmitted pulse and is the worst - case polarity, it reduces the received pulse from >1.0 v to 0.75 v, still well above the 0.5 v sensing threshold of the decoder . figure 31 shows the magnetic flux density values in terms of more familiar quantities, such as maximum allowable current flow at given distances away from the ADM3054 transformers. figure 31 . maximum allowable current for various current - to- ADM3054 spacings with combinations of strong magnetic field and high frequency, any loops formed by printed circuit board ( pcb ) traces can induce error voltages large enough to trigger the thresholds of succeeding circuitry. therefore , c are is necessary in the layout of su ch traces to avoid this possibility. magnetic field frequency (hz) 1k 10k 100k 100m 1m 10m 100 10 1 0.1 0.01 0.001 maximum allowable magnetic flux density (kgauss) 10274-030 magnetic field frequency (hz) 1k 10k 100k 100m 1m 10m distance = 1m distance = 100mm distance = 5mm 1000 100 0.1 1 10 0.01 maximum allowable current (ka) 10274-031 www.datasheet.co.kr datasheet pdf - http://www..net/
ADM3054 data sheet rev. 0 | page 18 of 20 applications informa tion typical applications figure 32 . typical isolated can node u sing the ADM3054 gnd 1 txd rxd isol a tion barrier decode decode v dd2sense encode v dd1 ADM3054 voltage reference can transceiver logic side notes 1. r t is equa l t o the characteristic impedance of the cable used. bus side v dd2 can l canh bus connector 1 00nf digital isolation i coupler ? r d v dd2 vo lt age sense thermal shutdown gnd 2 3.3 or 5v supply 5v isolated supply 100n f v ref 3.3 or 5v supply can controller 100n f c t r t /2 r t /2 r t /2 r t /2 c t decode encode encode 10274-032 www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADM3054 rev. 0 | page 19 of 20 figure 33 . typical can bus usi ng the ADM3054 v dd2 sense v dd2sense rxd txd ADM3054 r d c t c t r t /2 r t /2 r t /2 r t /2 galvanic isolation canh canl v dd2 sense v dd2sense rxd txd ADM3054 r d galvanic isolation notes 1. maximum number of nodes: 110. 2. r t is equal to the characteristic impedance of the cable used. canh canl v dd2 sense v dd2sense rxd txd ADM3054 r d galvanic isolation canh canl 10274-033 www.datasheet.co.kr datasheet pdf - http://www..net/
ADM3054 data sheet rev. 0 | page 20 of 20 packaging and orderi ng information outline dimensions figure 34 . 16 - lead standard small outline package [soic_w] wide body (rw - 16) dimensions shown in millimeters and (inches) ordering guide model 1 temperature range package description package option adm305 4 brwz ? 40c to + 12 5c 16- lead standard small outline package [soic_w] rw -16 adm305 4brwz - r l7 ? 40c to + 12 5c 16- lead standard small outline package [soic_w] rw -16 eval - ADM3054ebz evaluation board 1 z = rohs compliant part. contr olli ng dimen sions are in mill imeter s; inch dimen sions (in p arent heses ) are round ed-off millimeter equiv alents for refere nce onl y and are not appropri a te for use in design. compliant t o jedec st andar ds ms-013-a a 10.50 (0.4134) 10.10 (0.3976) 0.3 0 (0. 01 18 ) 0.10 (0.0 039 ) 2.65 (0.1043) 2.3 5 (0.09 25) 10.65 (0.4193) 10.00 (0.3937) 7.6 0 (0. 299 2) 7.40 (0. 291 3) 0.75 (0.029 5) 0.25 (0.0098) 45 1.27 (0.050 0) 0.40 (0.0157) coplanari ty 0.10 0.33 (0.01 30) 0.20 (0.0079) 0.51 (0.0201) 0.31 (0.0122) sea ting plane 8 0 1 6 9 8 1 1.27 (0.05 00) bsc 03- 27-2 007-b ? 2011 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d10274 - 0 - 10/11(0) www.analog.com/ ADM3054 www.datasheet.co.kr datasheet pdf - http://www..net/

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