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3 kv rms dual channel digital isolators data shee t adum1280/adum1281/adum1285/adum1286 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 inf ringements of patents or other rights of 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 regi stered trademarks are the property of their 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 ? 2012 analog devices, inc. all rights reserved. features up to 1 0 0 mbps data rate (nrz) low propagation delay: 2 0 ns typical low dynamic power consumption bidirectional communication 3 v to 5 v level translation high temperature operation: 1 2 5c high common - mode transient immunity: > 25 kv/s default hig h output: adum1280/adum1281 default low output: adum1285/adum1286 narrow body, rohs - compliant, 8 - lead soic safety and regulatory approvals (pending) ul recognition: 3 000 v rms for 1 minute per ul 1577 c sa component acceptance notice #5a vde certificate of conformity din v vde v 0884 - 10 (vde v 0884 - 10): 2006 - 12 v iorm = 56 0 v peak applications general - purpose multichannel isolation d ata converter isolation industrial field bus isolation general descriptio n the adum1280 / adum1281 / adum1285 / adum1286 1 ( also referred to as adum 128x in this data sheet ) are dual - channe l digital isolators based on the analog devices, inc., i coupler? technology. combining high speed cmos and monolithic air core transformer technology, these isolatio n components provi de outstanding performance char acteristics superior to alternatives , such as optocoupler devices and other integrated couplers. with propagation delay at 2 0 ns, pulse width distortion is less than 2 n s for c grade . channel - to - channel mat ch ing is tight at 5 ns for c grade. the two channels of the adum 128x are independent isolation channels and are available in two channel configurations with three different data rates up to 100 mbps (see the ordering guide ). all models operate with the supply voltage on either side ranging from 2.7 v to 5.5 v, providing compatibility with lower voltag e systems as well as enabling a voltage translation functionality acro ss the isolation barrier. unlike other optocoupler alternatives, the adum128x isolators have a patented refresh feature that ensures dc correctness in the absence of input logic transitions . w hen power is first applied or is not yet applied to the input side, the adum1280 and adum1281 have a default high output , and the adum1285 and adum1286 have a default low output. for more information on safety and regulatory appro vals, go to http://www.analog.com/icouplersafety . functional block di agrams encode decode encode decode v dd1 v ia v ib gnd 1 v dd2 v oa v ob gnd 2 1 2 3 4 8 7 6 5 adum1280/ adum1285 10444-001 figure 1. adum1280 / adum1285 encode decode decode encode v dd1 v oa v ib gnd 1 v dd2 v ia v ob gnd 2 1 2 3 4 8 7 6 5 adum1281/ adum1286 10444-002 figure 2. adum1281 / adum1286 1 protected by u.s. patents 5,952,849 ; 6,873,065 ; 6,903,578 ; and 7,075,329 . o ther patents are pending.
adum1280/adum1281/adum1285/ adum1286 d ata sheet rev. 0 | page 2 of 16 table of contents fea tures .............................................................................................. 1 applications ....................................................................................... 1 general description ......................................................................... 1 functional block di agrams ............................................................. 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 electrical characte ristics 5 v operation ................................ 3 electrical characteristics 3 v operation ................................ 4 electrical characteristics mixed 5 v/3 v operation ............ 5 electrical characteristics mixed 3 v/5 v operation ............ 6 package characteristics ............................................................... 7 regulatory information ............................................................... 7 insulation and safety - related specifications ............................ 7 din v vde v 0884 - 10 (vde v 0884 - 10): 2006 - 12 insu lation characteristics ............................................................ 8 recommended operating conditions .......................................8 absolute maximum ratings ............................................................9 esd caution ...................................................................................9 pin configurations and function descriptions ......................... 10 typical performance characteristics ........................................... 12 applications information .............................................................. 13 pc board layout ........................................................................ 13 propagation delay - rel ated parameters ................................... 13 dc correctness and magnetic field immunity ..................... 13 power consumption .................................................................. 14 insulation lifetime ..................................................................... 15 outline dimensions ....................................................................... 16 ordering guide .......................................................................... 16 revision h istory 5/12 revision 0: initial version
data sheet adum1280/adum1281/adum1285/adum1286 rev . 0 | page 3 of 16 specifications electrical character istic s 5 v operation all typical specifications are at t a = 25c, v dd1 = v dd2 = 5 v. minimum/maximum specifications apply over the entire recommended operation range: 4.5 v v dd1 5.5 v, 4.5 v v dd2 5.5 v, ? 40c t a 1 2 5c , unless otherwise noted. switching specifications are tested with c l = 15 pf and cmos signal levels , unless otherwise noted. table 1 . a grade b grade c grade parameter symbol min typ min min typ max min typ max unit test conditions switching specifications pulse width pw 1000 4 0 10 ns within pwd limit data rate 1 25 100 mbps within pwd limit propagation delay t phl , t plh 50 35 13 18 24 ns 50% i nput to 50% output pulse width distortion pwd 10 3 2 ns |t plh ? t phl | change vs. temperature 7 3 1.5 ps/ c propagation delay skew t psk 38 1 2 9 ns between any two units at same operating conditions channel matching codirectional t pskcd 5 3 2 ns opposing direction t pskod 10 6 5 ns jitter 2 2 1 ns table 2 . parameter symbol 1 mbps C a, b, c grade 25 mbps C b grade 100 mbps C b grade unit test conditions min typ min min typ max min typ max supply current no load adum1280 / adum1285 i dd1 1. 1 1.6 6.2 7.0 20 2 5 ma i dd2 2.7 4. 5 4.8 7.0 9.5 1 5 ma adum1281 / adum1286 i dd1 2.1 2.6 4 .9 6.0 15 19 ma i dd2 2.3 2.9 4.7 6. 4 15.6 19 ma table 3 . for all models parameter symbol min typ max unit test conditions dc specifications logic high input threshold v ih 0 .7 v dd x v logic low input threshold v il 0.3 v dd x v logic high output voltages v oh v dd x ? 0.1 5.0 v i ox = ?20 a, v ix = v ixh v dd x ? 0.4 4.8 v i ox = ?4 ma, v ix = v ixh logic low output voltages v ol 0.0 0.1 v i ox = 20 a, v ix = v ixl 0.2 0.4 v i ox = 4 ma, v ix = v ixl input current per channel i i ?10 +0.01 +10 a 0 v v ix v dd x su pply current per channel quiescent input supply current i ddi(q) 0. 54 0.8 ma quiescent output supply current i ddo(q) 1. 6 2.0 ma dynamic input supply current i ddi(d) 0. 09 ma/ mbps dynamic output supply current i ddo(d) 0.0 4 ma/ mbps underv o ltage lockout positive v ddx threshold v ddxuv+ 2. 6 v negative v ddx threshold v ddxuv - 2. 4 v v ddx hysteresis v ddxuvh 0.2 v ac specifications output rise/fall time t r /t f 2.5 ns 10% to 90% common - mode transient immunity 1 |cm| 25 35 kv/s v ix = v ddx , v cm = 1000 v, transient magnitude = 800 v refresh period t r 1.6 s 1 |cm| is the maximum common - mode voltage slew rate that can be sustained while maintaining v o > 0.8 v ddx . the common - mode voltage slew rates apply to both rising a nd falling common - mode voltage edges.
adum1280/adum1281/adum1285/adum1286 d ata sheet rev. 0 | page 4 of 16 electrical character istics 3 v operation all typical specifications are at t a = 25c, v dd1 = v dd2 = 3.0 v. minimum/maximum specifications apply over the entire recommended operation range: 2.7 v v dd1 3.6 v, 2.7 v v dd2 3.6 v, ? 40c t a 1 2 5c , unless otherwise noted. switching specifications are tested with c l = 15 pf and cmos signal levels , unless otherwise noted . table 4 . a grade b grade c grade para meter symbol min typ min min typ max min typ max unit test conditions switching specifications pulse width pw 1000 40 10 ns within pwd limit data rate 1 25 100 mbps within pwd limit propagation delay t phl , t plh 50 35 20 25 33 ns 50% input to 50% output pulse width distortion pwd 10 3 2.5 ns |t plh ? t phl | change vs. temperature 7 3 1.5 ps/ c propagation delay skew t psk 38 16 12 ns between any two units at same operating conditions channel matching codirectional t pskcd 5 3 2.5 ns opposing - direction t pskod 10 6 5 ns jitter 2 2 1 ns 7 c od ir ec tional c han nel matc hi ng is th e ab sol ute value o f the d iff er enc e in p r op a gation d elays b etwee n any two c han nels with i n p uts on the same sid e of th e isolati on b arrier. o p p osing - d ir ec tio nal c han nel matc hin g is the ab s olute val ue o f the d iffer e nc e in p r op agati on d elays b etwee n any two c han nels wit h inp uts on op p osi ng sid es of the is ol ation barrier. table 5 . parameter symbol 1 mbps C a, b, c grade 25 mbps C b , c grade 100 mbps C c grade unit tes t conditions min typ min min typ max min typ max supply current no load adum1280 / adum1285 i dd1 0.75 1.4 5.1 9.0 17 2 3 ma i dd2 2.0 3.5 2.7 4.6 4.8 9 ma adum1281 / adum1286 i dd1 1. 6 2.1 3. 8 5 .0 11 15 ma i dd2 1. 7 2.3 3. 9 6. 2 11 15 ma table 6 . for all models par ameter symbol min typ max unit test conditions dc specifications logic high input threshold v ih 0.7 v dd x v logic low input threshold v il 0.3 v dd x v logic high output voltages v oh v ddx ? 0.1 3.0 v i ox = ?20 a, v ix = v ixh v ddx ? 0.4 2.8 v i ox = ?4 ma, v ix = v ixh logic low output voltages v ol 0.0 0.1 v i ox = 20 a, v ix = v ixl 0.2 0.4 v i ox = 4 ma, v ix = v ixl input current per channel i i ?10 +0.01 +10 a 0 v v ix v dd x supply current per channel quiescent input supply cu rrent i ddi(q) 0. 4 0.6 ma quiescent output supply current i ddo(q) 1. 2 1.7 ma dynamic input supply current i ddi(d) 0.08 ma/mbps dynamic output supply current i ddo(d) 0.0 15 ma/mbps undervoltage lockout positive v ddx threshold v dd x uv+ 2 .6 v negative v ddx threshold v dd x uv ? 2.4 v v ddx hysteresis v dd x uvh 0.2 v ac specifications output rise/fall time t r /t f 3 ns 10% to 90% common - mode transient immunity 1 |cm| 25 35 kv/s v ix = v ddx , v cm = 1000 v, transient magnitude = 800 v refresh period t r 1.6 s 1 |c m| is the maximum common - mode voltage slew rate that can be sustained while maintaining v o > 0.8 v ddx . the common - mode voltage slew rates apply to both rising and falling common - mode voltage edges .
data sheet adum1280/adum1281/adum1285/adum1286 rev. 0 | page 5 of 16 electrical character istics mixed 5 v/3 v operat ion all t ypical specifications are at t a = 25c, v dd1 = 5 v, v dd2 = 3.0 v. minimum/maximum specifications apply over the entire recommended operation range: 4 .5 v v dd1 5.5 v, 2.7 v v dd2 3.6 v; and ? 40c t a 1 2 5c , unless otherwise noted. switching specifications are tested with c l = 15 pf and cmos signal levels unless otherwise noted. table 7 . a grade b grade c grade par ameter symbol min typ min min typ max min typ max unit test conditions switching specifications pulse width pw 1000 40 10 ns within pwd limit data rate 1 25 100 mbps within pwd limit propagation delay t phl , t plh 50 35 13 2 0 26 ns 50% input to 50% output pulse width distortion pwd 10 3 2 ns |t plh ? t phl | change vs. temperature 7 3 1.5 ps/?c propagation delay skew t psk 38 16 12 ns between any two units at same operating conditions channel matching codirectional t pskcd 5 3 2 ns opposing - direction t pskod 10 6 5 ns jitter 2 2 1 ns 7 c od ir ec tional c han nel matc hi ng is th e ab sol ute value o f the d iff er enc e in p r op a gation d elays b etwee n any two c han nels with i n p uts on the same sid e of th e isolati on b arrier. o p p osing - d ir ec tio nal c han nel matc hin g is the ab s olute val ue o f the d iffer e nc e in p r op agati on d elays b etwee n any two c han nels wit h inp uts on op p osi ng sid es of the is olatio n barrier. table 8 . parameter symbol 1 mbps C a, b, c grade 25 mbps C b, c grade 100 mbps C c grade unit test c onditions min typ min min typ max min typ max supply current no load adum1280 / adum1285 i dd1 1. 1 1.6 6.2 7.0 20 25 ma i dd2 2. 0 3.5 2.7 4.6 4.8 9.0 ma adum1281 / adum1286 i dd1 2.1 2.6 4. 9 6.0 1 5 19 ma i dd2 1. 7 2.3 3. 9 6.2 11 15 ma table 9 . for all models param eter symbol min typ max unit test conditions dc specifications logic high input threshold v ih 0.7 v dd x v logic low input threshold v il 0.3 v dd x v logic high output voltages v oh v ddx ? 0.1 v ddx v i ox = ?20 a, v ix = v ixh v ddx ? 0.4 v ddx ? 0.2 v i ox = ?4 ma, v ix = v ixh logic low output voltages v ol 0.0 0.1 v i ox = 20 a, v ix = v ixl 0.2 0.4 v i ox = 4 ma, v ix = v ixl input current per channel i i ?10 +0.01 +10 a 0 v v ix v dd x supply current per channel quiescent input sup ply current i ddi(q) 0. 54 0.75 ma quiescent output supply current i ddo(q) 1. 2 2.0 ma dynamic input supply current i ddi(d) 0. 09 ma/mbps dynamic output supply current i ddo(d) 0.02 ma/mbps undervoltage lockout positive v ddx threshold v ddx uv+ 2.6 v negative v ddx threshold v dd x uv ? 2.4 v v ddx hysteresis v ddx uvh 0.2 v ac specifications output rise/fall time t r /t f 2.5 ns 10% to 90% common - mode transient immunity 1 |cm| 25 35 kv/s v ix = v ddx , v cm = 1000 v, transient magnitude = 800 v refresh period t r 1.6 s 1 |cm| is the maximum common - mode voltage slew rate that can be sustained while maintaining v o > 0.8 v ddx . the common - mode voltage slew rates apply to both rising and falling common - mode voltage edges.
adum1280/adum1281/adum1285/adum1286 d ata sheet rev. 0 | page 6 of 16 el ectrical characteris tics mixed 3 v/ 5 v operation all typical specifications are at t a = 25c, v dd1 = 3.0 v, v dd2 = 5 v . minimum/maximum specifications apply over the entire recommended operation range: 2.7 v v dd1 3.6 v, 4.5 v v dd2 5.5 v; and ? 40c t a 1 2 5c ; unless otherwise noted. switching specifications are tested with c l =15 pf and cmos signal levels , unless otherwise noted. table 10. a grade b grade c grade param eter symbol min typ min min typ max min typ max unit test conditions switching specifications pulse width pw 1000 40 10 ns within pwd limit data rate 1 25 100 mbps within pwd limit propagation delay t phl , t plh 50 35 16 2 4 3 0 ns 50% input to 50% output pulse width distortion pwd 10 3 2.5 ns |t plh ? t phl | change vs. temperature 7 3 1.5 ps/?c propagation delay skew t psk 38 16 12 ns between any two units at same operating conditions channel matching codirectional t pskcd 5 3 2.5 ns opposing - direction t pskod 10 6 5 ns jitter 2 2 1 ns 7 c od ir ec tional c han nel matc hi ng is th e ab sol ute value o f the d iff er enc e in p r op a gation d elays b etwee n any two c han nels with i n p uts on the same sid e of th e isolati on b arrier. o p p osing - d ir ec tio nal c han nel matc hin g is t he ab s olute val ue o f the d iffer e nc e in p r op agati on d elays b etwee n any two c han nels wit h inp uts on op p osi ng sid es of the is ola tion barrier. table 11. parameter symbol 1 mbps C a, b, c grade 25 mbps C b, c grade 100 mbps C c grade unit tes t conditions min typ min min typ max min typ max supply current no load adum1280 / adum1285 i dd1 0.7 5 1.4 5.1 9.0 17 23 ma i dd2 2.7 4.5 4. 8 7.0 9. 5 15 ma adum1281 / adum1286 i dd1 1. 6 2.1 3.8 5.0 1 1 15 ma i dd2 1.7 2.3 3.9 6.2 1 1 15 ma table 12 . for all models p arameter symbol min typ max unit test conditions dc specifications logic high input threshold v ih 0.7 v dd x v logic low input threshold v il 0.3 v dd x v logic high output voltages v oh v dd x ? 0.1 v dd x v i ox = ?20 a, v ix = v ixh v dd x ? 0.4 v dd x ? 0.2 v i ox = ?4 ma, v ix = v ixh logic low output voltages v ol 0.0 0.1 v i ox = 20 a, v ix = v ixl 0.2 0.4 v i ox = 4 ma, v ix = v ixl input current per channel i i ?10 +0.01 +10 a 0 v v ix v ddx supply current per channel quiescent input supply current i ddi(q) 0.4 0.75 ma quiescent output supply current i ddo(q) 1. 6 2.0 ma dynamic input supply current i ddi(d) 0.08 ma/mbps dynamic output supply current i ddo(d) 0.03 ma/mbps undervoltage - lockout positive v ddx threshold v ddx uv+ 2.6 v negative v ddx threshold v ddx uv ? 2.4 v v ddx hysteresis v dd x uvh 0.2 v ac specifications output rise/fall time t r /t f 2.5 ns 10% to 90% common - mode transient immunity 1 |cm| 25 35 kv/s v ix = v ddx , v cm = 1000 v, transient magnitude = 800 v refresh period t r 1.6 s 1 |cm| is the maximum common - mode voltage slew rate that can be sustained while maintaining v o > 0.8 v ddx . the common - mode voltage slew rates apply to both rising and falling common - mode voltage edges.
data sheet adum1280/adum1281/adum1285/adum1286 rev. 0 | page 7 of 16 package characterist ics table 13. parameter symbol min typ max unit test conditions resistance (input -to - output) 1 r i - o 10 13 ? capacitance (input -to - output) 1 c i - o 2 pf f = 1 mhz input capacitance 2 c i 4.0 pf ic junction - to - ambient thermal resistance ja 85 c/w thermocouple located at center of package underside 1 the device is considered a 2 - terminal device; pin 1 through pin 4 are shorted together and pin 5 through pin 8 are shorted together. 2 input capacitance is from any input data pin to ground. regul atory information the adum128x is pending approval by the organizations listed in table 14. see table 18 and table 19 for recommended maximum working voltages for specific cross - isolation waveforms and insulation levels. table 14. ul (p ending) csa (p ending) vde (p ending) recognized under ul 1577 component recognition program 1 a pproved under csa component acceptance notice #5a certified according to din v vde v 0884 - 10 (vde v 0884 - 10): 2006 - 12 2 s i ngle protection, 3000 v rms isolation v oltage basic insulation per csa 60950 - 1 - 03 and iec 60950 - 1, 400 v rms ( 565 v peak) maximum w orking voltage reinforced insulation, 560 v peak file e214100 file 205078 file 2471900 - 4880 - 0001 1 in accordance wit h ul 1577, each adum128x is proof tested by applyin g an insulation test voltage 36 00 v rms for 1 second (cur rent leakage detection limit = 6 a). 2 in accordance with din v vde v 0884 - 10 , each adum128x is proof tested by applying an insulation test voltage 1050 v peak for 1 second (partial discharge detection limit = 5 pc). the asterisk (*) marked on the component designates din v vde v 0884 - 10 approval. insulation and safet y - related specificatio ns table 15. parameter symbol value unit conditions rated dielectric insulation vol tage 3000 v rms 1 - minute duration minimum external air gap (clearance) l(i01) 4 .0 m m min measured from input terminals to output terminals, shortest distance through air minimum external tracking (creepage) l(i02) 4. 0 m m min measured from input termina ls to output terminals, shortest distance path along body minimum internal gap (internal clearance) 0.017 mm min insulation distance through insulation tracking resistance (comparative tracking index ) cti > 400 v din iec 112/vde 0303 part 1 isolation gr oup ii material group (din vde 0110, 1/89, table 1)
adum1280/adum1281/adum1285/adum1286 d ata sheet rev. 0 | page 8 of 16 din v vde v 0884 - 10 (vde v 0884 - 10) : 2006 - 12 insulation character istics these isolators are suitable for reinforced electrical isolation within the safety limit data only . maintenance of the safety da ta is ensured by protective circuits. the asterisk ( * ) marked on packages denotes din v vde v 0884 - 10 approval. table 16. description conditions symbol characteristic unit installation classification per din vde 0110 for rate d mains voltage 150 v rms i to iv for rated mains voltage 300 v rms i to iii for rated mains voltage 400 v rms i to ii climatic classification 40/105/21 pollution degree per din vde 0110, table 1 2 maximum working insulation volta ge v iorm 560 v peak input - to - output test voltage, method b 1 v iorm 1.875 = v pd(m) , 100% production test, t ini = t m = 1 sec, partial discharge < 5 pc v pd(m) 1050 v peak input - to - output test voltage, method a after environmental tests subgroup 1 v i orm 1.5 = v pd(m) , t ini =60 sec, t m = 10 sec, partial discharge < 5 pc v pd(m) 840 v peak after input and/or safety test subgroup 2 and subgroup 3 v iorm 1.2 = v pd(m) , t ini = 60 sec, t m = 10 sec, partial discharge < 5 pc v pd(m) 672 v peak highest allowab le overvoltage v iotm 4000 v peak withstand isolation voltage 1 minute withstand rating v iso 3000 v rms surge isolation voltage v peak = 10 kv, 1.2 s rise time, 50 s , 50% fall time v iosm 6 000 v peak safety limiting values maximum value allowed in the eve nt of a failure (see figure 3 ) case temperature t s 150 c side 1 i dd1 current i s1 290 ma insulation resistance at t s v io = 500 v r s >10 9 ? 300 0 50 100 150 200 250 0 50 100 150 200 safety-limiting current (ma) ambient temperature (c) 10444-003 figure 3 . thermal derating curve at v ddx = 5 v , dependence of safety - limiting values with case temperature per din v vde v 0884 - 10 recommended operatin g conditions table 17. parameter symbol min max unit operating temperature t a ?40 +1 2 5 c supply voltages 1 v dd1 , v dd2 2.7 5.5 v input signal rise and fall times 1.0 ms 1 see the dc correctness and magnetic field immunity section.
data sheet adum1280/adum1281/adum1285/adum1286 rev. 0 | page 9 of 16 absolute maximum r atings t a = 25c, unless othe rw ise noted. table 18. parameter rating storage tem perature (t st ) range ?65c to +150 c ambient operating temperature (t a ) range ?40c to +1 2 5 c supply voltages (v dd1 , v dd2 ) ?0.5 v to +7.0 v input volta g es (v ia , v ib ) ?0.5 v to v dd i + 0.5 v output voltages (v oa , v ob ) ?0.5 v to v dd2 + 0.5 v average ou tput current per pin 1 side 1 (i o1 ) ?1 0 ma to +1 0 ma side 2 (i o2 ) ? 10 ma to + 10 ma common - mode transients 2 ?100 kv/s to +100 kv/s 1 see figure 3 for maximum rated current values for various temperatures. 2 refers to common - mode transients across the insulation barrier. common - mode transients exceeding the absolute maximum ratings may cause latch - up or permanent damage. stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may aff ect device reliability. esd caution table 19 . maximum continuous working voltage 1 parameter max unit constraint ac voltage, bipolar waveform 565 v peak 50- year minimum lifetime ac voltage, unipolar waveform basic insul ation 1131 v peak maximum approved working voltage per iec 60950 -1 reinforced insulation 560 v peak maximum approved working voltage per iec 60950 - 1 and vde v 0884-10 dc voltage basic insulation 1131 v peak maximum approved working voltage per iec 60 950 -1 reinforced insulation 560 v peak maximum approved working voltage per iec 60950 - 1 and vde v 0884-10 1 refers to continuous voltage magnitude imposed across the isolation barri er. see the insulation lifetime section for more details.
adum1280/adum1281/adum1285/adum1286 d ata sheet rev. 0 | page 10 of 16 pin configurations a nd function descript ions 1 8 2 7 3 6 4 5 top view (not to scale) adum1280/ adum1285 v dd1 v ia v ib gnd 1 v dd2 v oa v ob gnd 2 10444-004 figure 4. adum 128 0 /adum1285 pin configuration table 20. adum 128 0 / adum1285 pin function descriptions pin o. mnemonic description 1 v dd1 2.7 v to 5.5 v supply voltage for isolator side 1. 2 v ia logic i nput a. 3 v ib logic input b. 4 gnd 1 ground 1. ground reference for isolator side 1. 5 gnd 2 ground 2. ground reference for isolator side 2. 6 v ob logic output b. 7 v oa logic output a. 8 v dd2 2.7 v to 5.5 v supply voltage for isolator side 2. 1 8 2 7 3 6 4 5 top view (not to scale) adum1281/ adum1286 v dd1 v oa v ib gnd 1 v dd2 v ia v ob gnd 2 10444-005 figure 5 . adum 128 1 /adum1286 pin configuration table 21. adum 128 1 / adum1286 pin function descriptions pin o. mnemonic description 1 v dd1 2.7 v to 5.5 v supply voltage for isolator side 1. 2 v oa logic output a. 3 v ib logic input b. 4 gnd 1 ground 1. ground reference for isolator side 1. 5 gnd 2 ground 2. ground reference for isolator side 2. 6 v ob logic output b. 7 v ia logic input a. 8 v dd2 2.7 v to 5.5 v supply voltage for isolator side 2. for specific layout guidelines, refer to the an - 1109 application no te, recommendations for control of radiated emissions with i coupler devices .
data sheet adum1280/adum1281/adum1285/adum1286 rev. 0 | page 11 of 16 table 22. adum12 8 0 truth table (positive logic) v ia input v ib input v dd1 state v dd2 state v oa output v ob output notes h h powered powered h h l l powered powered l l h l powered powered h l l h powered powered l h l l unpowered powered h h outputs return to the input state within 1 .6 s of v ddi power restoration. x x powered unpowered indeterminate indeterminate outputs return to the input state within 1 .6 s of v ddo power restoration. table 23. adum1281 truth table (positive logic) v ia input v ib input v dd1 state v dd2 state v oa output v ob output notes h h powered powered h h l l powered powered l l h l powered powered h l l h powered powered l h x l unpowered powered indeterminate h outputs return to the input state within 1 .6 s of v dd1 power restoration. l x powered unpowered h indeterminate outputs return to the input state within 1 .6 s of v ddo power restoration. table 24. a dum1285 truth table (positive logic) v ia input v ib input v dd1 state v dd2 state v oa output v ob output notes h h powered powered h h l l powered powered l l h l powered powered h l l h powered powered l h l l unpowered powered l l outputs return to the input state within 1 .6 s of v ddi power restoration. x x powered unpowered indeterminate indeterminate outputs return to the input state within 1 .6 s of v ddo power restoration. table 25. adum1286 truth table (positive logic) v ia input v ib input v dd1 state v dd2 state v oa output v ob output notes h h powered powered h h l l powered powered l l h l powered powered h l l h powered powered l h x l unpowered powered indeterminate l outputs return to the input state within 1 .6 s of v dd1 power restoration. l x powered unpowered l indeterminate outputs return to the input st ate within 1 .6 s of v ddo power restoration.
adum1280/adum1281/adum1285/adum1286 d ata sheet rev. 0 | page 12 of 16 typical performance characteristics 10 0 2 4 6 8 0 20 40 60 80 100 10 30 50 70 90 current (ma) data rate (mbps) 5v 3v 10444-006 figure 6 . typical supply current per input channel vs. data rate for 5 v and 3 v operation 10 0 2 4 6 8 0 20 40 60 80 100 10 30 50 70 90 current (ma) data rate (mbps) 5v 3v 10444-007 figure 7 . typical sup ply current per output channel vs. data rate for 5 v and 3 v operation (no output load) 10444-008 10 0 4 2 6 8 0 20 40 60 80 100 10 30 50 70 90 current (ma) data rate (mbps) 5v 3v figure 8. typical supply current per output channel vs. data rate for 5 v and 3 v operation (15 pf output load) 10444-009 20 0 5 10 15 0 20 40 60 80 100 10 30 50 70 90 current (ma) data rate (mbps) 5v 3v figure 9 . typical adum1280 or adum1285 v dd1 supply current vs. data rate for 5 v and 3 v operation 10444-010 20 0 5 10 15 0 20 40 60 80 100 10 30 50 70 90 current (ma) data rate (mbps) 5v 3v figure 10 . typical adum1280 or adum1285 v dd2 supply current vs. data rate for 5 v and 3 v operation 10444-0 1 1 20 0 5 10 15 0 20 40 60 80 100 10 30 50 70 90 current (ma) data rate (mbps) 5v 3v figure 11 . typical adum1281 or adum1286 v dd1 or v dd2 supply current vs. data rate for 5 v and 3 v operation
data sheet adum1280/adum1281/adum1285/adum1286 rev. 0 | page 13 of 16 application s information pc board layout the adum 128x digital isolator requires no external interface circuitry for the logic interfaces. power supply bypassing is strongly recommended at both input and output supply pins v dd1 and v dd2 ( see figure 12 ). the capacitor value should be between 0.01 f and 0.1 f. the total lead length between both ends of the capacitor and the input power supply pin should not exceed 20 mm. the adum128x can readily meet cispr 22 class a (and fcc class a) emissions standards, as well as the more stringent cispr 22 class b (and fcc class b) standards in an unshielded environment, with proper pcb design choices. refer to the an - 1109 applicaton note, recommendations for control of radiated emissions with i coupler devices for pcb - related emi mitigation techniques, including board layout and stack - up issues. propagation delay - related parameters propagation delay is a parameter that describes the time it takes a logic signal to propagate through a component. the input - to - output propagation delay time for a high - to - low transition may differ from the propagation delay time of a low - to - high transition . input (v ix ) output (v ox ) t plh t phl 50% 50% 10444-012 figure 12 . propagation delay parameters pulse wid th distortion is the maximum difference between these two propagation delay values and an indication of how accurately the timing of the input signal is preserved. channel - to - channel matching refers to the maximum amount the propagation delay differs betwe en channels within a single adum128x component. propagation delay skew refers to the maximum amount the propagation delay differs between multiple adum128x compo nents operating under the same conditions. dc correctness and m agnetic field immunity positive and negative logic transitions at the isolator input cause narrow (~1 ns) pulses to be sent via the transformer to the decoder. the decoder is bistable and is, therefore, either set or reset by the pulses indicating input logic transitions. in the absence of logic transitio ns at the input for more than ~1.6 s, a periodic set of refresh pulses indicative of the correct input state are sent to ensure dc c orrectness at the output. if the decoder receives no pulses for more than about 6.4 s , the input side is assumed to be unpowered or nonfunctional, in which case, the isolator output is forced to a default low state by the watchdog timer circuit . the limi tation on the devices magnetic field immunity is set by the condition in which induced voltage in the transformer receiving coil is sufficiently large to either falsely set or reset the decoder. the following analysis defines such conditions. the adum 128 0 is examined in a 3 v operating condition because it represents the most susceptible mode of operation of this product . the pulses at the transformer output have an amplitude greater than 1.5 v. the decoder has a sensing threshold of about 1.0 v, therefore establishing a 0.5 v margin in which induced voltages can be tolerated. the voltage induced across the receiving coil is given by v = ( ? d / dt ) r n 2 ; n = 1, 2, , n where: is the magnetic flux density. r n is the radius of the n th turn in the receiving coil. n is the number of turns in the receiving coil. given the geometry of the receiving coil in the adum1280 and an imposed requirement that the induced volt age be, at most, 50% of the 0.5 v margin at the decoder, a maximum allowable magnetic field is calculated, as shown in figure 13. magnetic field frequency (hz) 100 maximum allowable magnetic flux density (kgauss) 0.001 1m 10 0.01 1k 10k 10m 0.1 1 100m 100k 10444-013 figure 13 . maximum allowable external magnetic flux density
adum1280/adum1281/adum1285/adum1286 d ata sheet rev. 0 | page 14 of 16 for example , at a magnetic field frequency of 1 mhz, the maximum allowable magnetic field of 0. 08 kgauss induces a voltage of 0.25 v at the receiving coil. this is about 50% of the sensing threshold and does not cause a faulty output transition. if such an event occ urs, with the worst - case polarity, during a transmitted pulse , it would reduce the received pulse from >1.0 v to 0.75 v. this is still well above the 0.5 v sensing threshold of the decoder. the preceding magnetic flux density values correspond to specific current magnitudes at given distances away from the adum1280 transformers. figure 14 expresses these allowable current magni - tudes as a function of frequency for selected distances. t he adum1280 is very insensitive to external fields. o nly extremely large, high frequency currents, very close to the component could potentially be a concern. for the 1 mhz example noted, one would have to place a 0.2 k a current 5 mm away from the adum1280 to affect component operation. magnetic field frequency (hz) maximum allowable current (ka) 1000 100 10 1 0.1 0.01 1k 10k 100m 100k 1m 10m distance = 5mm distance = 1m distance = 100mm 10444-014 figure 14 . maximum allowable current for various current to adum1280 spacings note that at combinations of strong magnetic field and high frequency, any loops formed by printed circuit board traces could induce sufficiently large error voltages to trigger the thresholds of succeeding circuitry. take ca re to avoid pcb structures that form loops. power consumption the supply current at a given channel of the adum 128 x isolator is a function of the supply voltage, the data rate of the channel , and the output l oad of the channel . for each input channel, the supply current is given by i ddi = i ddi ( ) f 0.5 f r i ddi = i ddi (d) (2 f ? f r ) + i ddi ( ) f > 0.5 f r for each output channel, the supply current is given by i ddo = i ddo ( ) f 0.5 f r i ddo = ( i ddo ( d ) + (0.5 10 ?3 ) c l v ddo ) (2 f ? f r ) + i ddo ( ) f > 0.5 f r where: i ddi (d) , i ddo (d) are the input and output dynamic supply currents per channel (ma/ mbps ). c l is the output load capacitance (pf). v ddo is the output supply voltage (v). f is the input logic signa l frequency (mhz); it is half the input data rate , expressed in units of mbps . f r is t he input stage refresh rate ( mbps ) = 1/ t r (s) . i ddi () , i ddo () are the specified input and output quiescent supply currents (ma). to calculate the total v dd1 and v dd2 supply current, the supply currents for each input and output channel corresponding to v dd1 and v dd2 are calculated and totaled. figure 6 and figure 7 show per - channel supply currents as a function of data rate for an unloaded output condition. figure 8 show s th e per - channel supply current as a function of data rate for a 15 pf output condition. figure 9 through figure 11 show the total v dd1 and v dd2 supply current as a function of data rate for adum1280 / adum 1281 channel configurations.
data sheet adum1280/adum1281/adum1285/adum1286 rev. 0 | page 15 of 16 insulation lifetime all insulation structures eventually break down when subjected to voltage stress over a sufficiently long period . the rate of insulation degradation is dependent on the characteristics of the voltage waveform applied across the insulation. in addition to the testing performed by the regulato ry agencies, analog devices carries out an extensive set of evaluations to d etermine the lifetime of the insulation structure within the adum128x . analog devices performs accelerated life testing using voltage levels higher than the rated continuous working voltage. acceleration facto rs for several operating conditions are determined. these factors allow calculation of the time to failure at the actual working voltage. the values shown in table 19 summarize the peak voltage for 50 years of ser vice life for a bipolar ac operating condition and the maximum csa/vde approved working voltages. in many cases, the approved working voltage is higher than the 50- year service life voltage. operation at these high working voltages can lead to shortened insulation life in some cases. the insulation lifetime of the adum128x depends on the voltage waveform type imposed across the isolation barrier. the i coupler insulation structure degrades at different rates depending on whether the waveform is bipolar ac, unipolar ac, or dc. figure 15, figure 16 , and figure 17 illustrate these different isolation voltage waveforms. bipolar ac volta ge is the most stringent environment. the goal of a 50 - year operating lifetime under the ac bipolar condition determines the analog devices recommended maximum working voltage. in the case of unipolar ac or dc voltage, t he stress on the insulation is significantly lower. this allows operation at higher working voltages while still achieving a 50 - year service life. the working voltages listed in table 19 can be applied while main - t aining the 50 - year minimum lifetime provided the voltage conforms to either the unipolar ac or dc voltage case. any cross - insulation voltage waveform that does not conform to figure 16 or figure 17 should be treated as a bipolar ac waveform, and its peak voltage should be limited to the 50 - year lifetime voltage value listed in table 19. note that the voltage presented in figure 17 is shown as sinusoidal for illustration purposes only. it is meant to represent any voltage waveform varying between 0 v and some limiting value. the limiting value can be positive or negative, but the voltage cannot cross 0 v. 0v rated peak voltage 10444-015 figure 15 . bipolar ac waveform 0v rated peak voltage 10444-016 figure 16 . unipolar ac waveform 0v rated peak voltage 10444-017 figure 17 . dc waveform
adum1280/adum1281/adum1285/adum1286 d ata sheet rev. 0 | page 16 of 16 outline dimensions contr olling dimen sions are in milli meter s; inch dime nsion s (in p arent heses) are round ed-of f milli meter equiv alent s for reference onl y and are not appro pria te for use in desig n. compl iant t o jedec st andar ds ms-012-aa 012 407- a 0.25 (0.00 98) 0.17 (0.00 67) 1.27 (0.05 00) 0.40 (0.0157) 0.50 (0.0196) 0.25 (0.00 99) 45 8 0 1.75 (0.0688) 1.35 (0.05 32) sea ting plane 0.25 (0.0098) 0.10 (0.00 40) 4 1 8 5 5.00 (0.19 68) 4.80 (0.18 90) 4.00 (0.15 74) 3.80 (0.1497) 1.27 (0.0500) bsc 6.20 (0.24 41) 5.80 (0.22 84) 0.51 (0.02 01) 0.31 (0.01 22) coplanarity 0.10 figure 1 9- lead standard small outline package [soic_n] narrow body (r - 8) dimensions shown in millim eters (inches) ordering guide model 1 no. of inputs, v dd1 side no. of inputs, v dd2 side max data rate max prop delay, 5 v output default state temperature range package description package option adum1280arz 2 0 1 mbps 50 high ?40 c to +125 c 8 - lead soic_n r - 8 adum1280arz - rl7 2 0 1 mbps 50 high ?40 c to +125 c 8 - lead soic_n 7 tape and reel r - 8 adum1280brz 2 0 25 mbps 35 high ?40 c to +125 c 8 - lead soic_n r - 8 adum1280brz - rl7 2 0 25 mbps 35 high ?40 c to +125 c 8 - lead soic_n 7 tape and reel r - 8 adum1280crz 2 0 100 mbps 24 high ?40 c to +125 c 8 - lead soic_n r - 8 adum1280crz - rl7 2 0 100 mbps 24 high ?40 c to +125 c 8 - lead soic_n 7 tape and reel r - 8 adum1281arz 1 1 1 mbps 50 high ?40 c to +125 c 8 - lead soic_n r - 8 adum1281arz - rl7 1 1 1 mbps 50 high ?40 c to +125 c 8 - lead soic_n 7 tape and reel r - 8 adum1281brz 1 1 25 mbps 35 high ?40 c to +125 c 8 - lead soic_n r - 8 adum1281brz - rl7 1 1 25 mbps 35 high ?40 c to +125 c 8 - lead soic_n 7 tape and reel r - 8 adum1281crz 1 1 100 mbps 2 4 high ?40 c to +125 c 8 - lead soic_n r - 8 adum1281crz - rl7 1 1 100 mbps 24 high ?40 c to +125 c 8 - lead soic_n 7 tape and reel r - 8 adum1285arz 2 0 1 mbps 50 low ?40 c to +125 c 8 - lead soic_n r - 8 adum1285arz - rl7 2 0 1 mbps 50 low ?40 c to +125 c 8 - lead so ic_n 7 tape and reel r - 8 adum1285brz 2 0 25 mbps 35 low ?40 c to +125 c 8 - lead soic_n r - 8 adum1285brz - rl7 2 0 25 mbps 35 low ?40 c to +125 c 8 - lead soic_n 7 tape and reel r - 8 adum1285crz 2 0 100 mbps 24 low ?40 c to +125 c 8 - lead soic_n r - 8 adum1285c rz - rl7 2 0 100 mbps 24 low ?40 c to +125 c 8 - lead soic_n 7 tape and reel r - 8 adum1286arz 1 1 1 mbps 50 low ?40 c to +125 c 8 - lead soic_n r - 8 adum1286arz - rl7 1 1 1 mbps 50 low ?40 c to +125 c 8 - lead soic_n 7 tape and reel r - 8 adum1286brz 1 1 25 mbps 35 low ?40 c to +125 c 8 - lead soic_n r - 8 adum1286brz - rl7 1 1 25 mbps 35 low ?40 c to +125 c 8 - lead soic_n 7 tape and reel r - 8 adum1286crz 1 1 100 mbps 24 low ?40 c to +125 c 8 - lead soic_n r - 8 adum1286crz - rl7 1 1 100 mbps 24 low ?40 c to +125 c 8 - lead soi c_n 7 tape and reel r - 8 1 z = rohs compliant part. ? 2012 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d10444 - 0 - 5/12(0)

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