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1 kv, dual channel digital isolators data sheet ADUM7240 / adum7241 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 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 registered 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 narrow-body, rohs-compliant, 8-lead soic safety and regulatory approvals ul recognition (pending) ul 1577: 1000 v rms for 1 minute low power operation 5 v operation 2.4 ma per channel maximum at 0 mbps to 1 mbps 11.8 ma per channel maximum at 25 mbps 3.3 v operation 1.7 ma per channel maximum at 0 mbps to 1 mbps 8.2 ma per channel maximum at 25 mbps bidirectional communication up to 25 mbps data rate (nrz) 3 v/5 v level translation high temperature operation: 105c high common-mode transient immunity: >15 kv/s applications general-purpose multichannel isolation data converter isolation industrial field bus isolation functional block diagrams encode decode encode decode v dd1 v ia v ib g nd 1 v dd2 v oa v ob gnd 2 1 2 3 4 8 7 6 5 ADUM7240 10240-001 figure 1. ADUM7240 encode decode decode encode v dd1 v oa v ib g nd 1 v dd2 v ia v ob gnd 2 1 2 3 4 8 7 6 5 adum7241 10240-002 figure 2. adum7241 general description the ADUM7240 / adum7241 1 are dual channel digital isolators based on the analog devices, inc., i coupler? technology. combining high speed cmos and monolithic air core trans- former technologies, these isolation components provide outstanding performance characteristics superior to the alterna- tives, such as optocoupler devices and other integrated couplers. the ADUM7240 / adum7241 dual 1 kv digital isolation devices are packaged in a narrow-body 8-lead soic. the ADUM7240/ adum7241 offer a cost-effective option compared to 2.5 kv or 5 kv isolators where only functional isolation is needed. like other analog devices isolators, the ADUM7240/ adum7241 offer very low power consumption, consuming one-tenth to one-sixth the power of comparable isolators at data rates up to 25 mbps. despite the low power consumption, all models of the ADUM7240/ adum7241 provide low pulse width distortion (<5 ns for c grade). in addition, every model has an input glitch filter to protect against extraneous noise disturbances. the ADUM7240 / adum7241 provide two independent isolation channels and are available in two channel configura- tions with 1 mbps or 25 mbps data rates (see the ordering guide). all models operate with the supply voltage on either side ranging from 3.0 v to 5.5 v, providing compatibility with lower voltage systems as well as enabling voltage translation functionality across the isolation barrier. the ADUM7240/ adum7241 also have an output default high logic state in the absence of input power. 1 protected by u.s. patents 5,952,849; 6,873, 065; and 7,075,329. other patents pending. www.datasheet.co.kr datasheet pdf - http://www..net/
ADUM7240/adum7241 data sheet rev. 0 | page 2 of 16 table of contents features .............................................................................................. 1 ? applications ....................................................................................... 1 ? functional block diagrams ............................................................. 1 ? general description ......................................................................... 1 ? revision history ............................................................................... 2 ? specifications ..................................................................................... 3 ? electrical characteristics5 v operation................................ 3 ? electrical characteristics3.3 v operation ............................ 4 ? electrical characteristicsmixed 5 v/3.3 v operation ........ 5 ? electrical characteristicsmixed 3.3 v/5 v operation ........ 6 ? package characteristics ............................................................... 7 ? regulatory information ............................................................... 7 ? insulation and safety-related specifications ............................ 7 ? recommended operating conditions ...................................... 7 ? absolute maximum ratings ............................................................8 ? esd caution...................................................................................8 ? pin configurations and function descriptions ............................9 ? typical performance characteristics ........................................... 10 ? applications information .............................................................. 12 ? printed circuit board layout ................................................... 12 ? propagation delay-related parameters ................................... 12 ? dc correctness .......................................................................... 12 ? magnetic field immunity .......................................................... 12 ? power consumption .................................................................. 13 ? insulation lifetime ..................................................................... 13 ? outline dimensions ....................................................................... 14 ? ordering guide .......................................................................... 14 ? revision history 5/12revision 0: initial version www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADUM7240/adum7241 rev. 0 | page 3 of 16 specifications electrical charact eristics 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 of 4.5 v v dd1 5.5 v, 4.5 v v dd2 5.5 v, and ?40c t a + 105c , unless otherwise noted. switching specifications are tested with c l = 15 pf and cmos signal levels, unless otherwise noted. table 1 . a grade c grade parameter symbol min typ max min typ max unit test conditions /comments switching specificat ions pulse width pw 250 40 ns within pwd limit data rate 1 25 mbps within pwd limit propagation delay t phl , t plh 50 75 32 4 1 50 ns 50% input to 50% output pulse width distortion pwd 10 25 2 5 ns |t plh ? t phl | change vs. temperature 5 3 ps/c propagation delay skew 1 t psk 20 10 ns channel matching codirectional t pskcd 25 2 4 ns opposing direction t pskod 30 2 6 ns jitter 2 2 ns 1 t psk is the magnitude of the worst - case difference in t phl or t plh that is measured between units at the same operating temperature, supp ly voltages, and output load within the recommended operating conditions. table 2 . 1 mbps a , c grade s 25 mbps c grade parameter symbol min typ max min typ max unit test conditions /comments supply current adum724 0 i dd1 2.2 2.7 1 6 20 ma i dd2 1. 7 2.0 3.0 3 . 6 ma adum7241 i dd1 1. 9 2. 4 9.6 1 2 ma i dd2 1. 9 2. 4 8.4 11 ma table 3 . for all models parameter symbol min typ max unit test conditions /comments 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 ? 0.3 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 i x v ddx supply current per channel quiescent input supply current i ddi(q) 1 1.2 ma quiescent output supply current i ddo(q) 0.8 0.95 ma dynamic input supply current i ddi(d) 0.2 9 ma/mbps dynamic output supply current i ddo(d) 0.0 3 ma/mbps ac specifications output rise/fall time t r /t f 2.0 ns 10% to 90% common - mode transient immunity 1 |cm| 1 5 2 5 kv/s v ix = v ddx , v cm = 1000 v, transient magnitude = 800 v refresh rate f r 600 khz dc data inputs 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. www.datasheet.co.kr datasheet pdf - http://www..net/
ADUM7240/adum7241 data sheet rev. 0 | page 4 of 16 electrical character istics 3.3 v operation all typical specifications are at t a = 25c, v dd1 = v dd2 = 3.3 v. minimum/maximum specifications apply over the entire recommended opera tion range of 3.0 v v dd1 3.6 v, 3.0 v v dd2 3.6 v , and ?40c t a + 105c , unless otherwise noted. switching specifications are tested with c l = 15 pf and cmos signal levels, unless otherwise noted. table 4 . a grade c gra de parameter symbol min typ max min typ max unit test conditions /comments switching specifications pulse width pw 250 40 ns within pwd limit data rate 1 25 mbps within pwd limit propagation delay t phl , t plh 6 0 8 5 3 7 5 0 64 ns 50% i nput to 50% output pulse width distortion pwd 10 25 2 5 ns |t plh ? t phl | change vs. temperature 5 3 ps/c propagation delay skew 1 t psk 2 0 10 ns channel matching codirectional t pskcd 25 2 4 ns opposing direction t pskod 30 2 7 ns jitter 2 2 ns 1 t psk is the magnitude of the worst - case difference in t phl or t plh that is measured between units at the same operating temperature, supply voltages, and output load within the recommended operating conditions. table 5 . 1 mbps a, c grades 25 mbps c grade parameter symbol min typ max min typ max unit test conditions /comments supply current ADUM7240 i dd1 1. 6 1.9 11 14 ma i dd2 1.2 1.5 2 .0 2. 5 ma adum7241 i dd1 1. 4 1. 7 6.8 8.0 ma i dd2 1. 4 1. 7 6.0 7.2 ma table 6 . for all models parameter symbol min typ max unit test conditions /comments dc specifications logic high inpu t 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 ? 0.2 v ddx v i ox = ?20 a, v ix = v ixh v ddx ? 0.4 v ddx ? 0.3 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 i x v ddx supply current per channel quiescent input supply current i ddi(q) 0. 71 0. 83 ma quiescent output supply current i ddo(q) 0. 59 0. 68 ma dynamic input supply current i ddi(d) 0. 20 ma/mbps dynamic output supply current i ddo(d) 0.0 2 ma/mbps ac specifications output rise/fall time t r /t f 2.8 ns 10% to 90% common - mode transient immunity 1 |cm| 15 2 5 kv/s v ix = v ddx , v cm = 1000 v, transient magnitude = 800 v refresh rate f r 550 khz dc data inputs 1 |cm| is the maximum c ommon - 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. www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADUM7240/adum7241 rev. 0 | page 5 of 16 electrical character istics mixed 5 v/3.3 v oper ation all typical specifications are at t a = 25c, v dd1 = 5 v, v dd2 = 3.3 v. minimum/maximum specifications apply over the ent ire recom - mended operation range of 4.5 v v dd1 5.5 v, 3.0 v v dd2 3.6 v , and ?40c t a + 105c , unless otherwise noted. switching specifications are tested with c l = 15 pf and cmos signal levels, unless otherwise noted. table 7 . a grade c grade parameter symbol min typ max min typ max unit test conditions /comments switching specifications pulse width pw 250 40 ns within pwd limit data rate 1 25 mbps within pwd limit propagation delay t phl , t plh 5 5 80 3 4 44 5 4 ns 50% input to 50% output pulse width distortion pwd 10 25 2 5 ns |t plh ? t phl | change vs. temperature 5 3 ps/c propagation delay skew 1 t psk 20 10 ns channel matching codirectional t pskcd 25 2 5 ns opposing direction t pskod 30 3 9 ns jitter 2 2 ns 1 t psk is the magnitude of the worst - case difference in t phl or t plh that is measured between units at the same operating temperature, supply voltages, and output load within the recommended operating conditions. table 8 . 1 mbps a, c grades 25 mbps c grade parameter symbol min typ max min typ max unit test conditions /comments supply current adum72 40 i dd1 2.2 2.8 14 18 ma i dd2 1.2 1.5 1.8 2.3 ma adum7 241 i dd1 1. 9 2. 3 9.5 1 2 ma i dd2 1 . 4 1 . 6 6.1 7.2 ma table 9 . for all models parameter symbol min typ max unit test conditions /comm ents 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. 3 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 i x v ddx supply current per channel quiescent input supply current i ddi(q) 1.0 1. 2 ma quiesce nt output supply current i ddo(q) 0. 59 0. 67 ma dynamic input supply current i ddi(d) 0.2 5 ma/mbps dynamic output supply current i ddo(d) 0.0 2 ma/mbps ac specifications output rise/fall time t r /t f 2.5 ns 10% to 90% common - mode transient i mmunity 1 |cm| 15 2 5 kv/s v ix = v ddx , v cm = 1000 v, transient magnitude = 800 v refresh rate f r 600 khz dc data inputs 1 |cm| is the maximum common - mode voltage slew rate that can be sustained while maintaining v o > 0.8 v ddx . the common - mo de voltage slew rates apply to both rising and falling common - mode voltage edges. www.datasheet.co.kr datasheet pdf - http://www..net/
ADUM7240/adum7241 data sheet rev. 0 | page 6 of 16 electrical character istics mixed 3.3 v/5 v oper ation all typical specifications are at t a = 25c, v dd1 = 3.3 v, v dd2 = 5 v. minim um/maximum specifications apply over the entire recom - mended operation range of 3.0 v v dd1 3.6 v, 4.5 v v dd2 5.5 v, and ?40c t a + 105c , unless otherwise noted. switching specifications are tested with c l = 15 pf and cmos signal levels, unless otherwise noted. table 10. a grade c grade parameter symbol min typ max min typ max unit test conditions /comments switching specifications pulse width pw 250 40 ns within pwd limit data rate 1 25 mbps with in pwd limit propagation delay t phl , t plh 55 80 3 5 4 7 59 ns 50% input to 50% output pulse width distortion pwd 10 25 2 5 ns |t plh ? t phl | change vs. temperature 5 3 ps/c propagation delay skew 1 t psk 20 10 ns channel matching codirectional t pskcd 25 2 5 ns opposing direction t pskod 30 5 10 ns jitter 2 2 ns 1 t psk is the magnitude of the worst - case difference in t phl or t plh that is measured between units at the same operating temperature, supply voltages, and output load wit hin the recommended operating conditions. table 11. 1 mbps a, c grades 25 mbps c grade parameter symbol min typ max min typ max unit test conditions supply current ADUM7240 i dd1 1 . 6 1.9 11 1 4 ma i dd2 1. 6 2.0 2.9 3.4 ma adum7241 i dd1 1 . 4 1 . 6 6.9 8.2 ma i dd2 1. 9 2 . 3 8.4 10.2 ma table 12 . 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 ddx ? 0.1 v ddx v i ox = ?20 a, v ix = v ixh v ddx ? 0.4 v ddx ? 0. 3 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. 71 0. 83 ma quiescent output supply current i ddo(q) 0. 80 0. 90 ma dynamic input supply current i ddi(d) 0. 20 ma/mbps dynamic output supply current i ddo(d) 0.0 3 ma/mbps ac specifications output rise/fall time t r /t f 2.5 ns 10% to 90% common - mode transient immunity 1 |cm| 15 25 kv/s v ix = v ddx , v cm = 1000 v, tran sient magnitude = 800 v refresh rate f r 550 khz dc data inputs 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. www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADUM7240/adum7241 rev. 0 | page 7 of 16 package characterist ics table 13. parameter symbol min typ max unit test conditions /comments 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 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. regulatory information the ADUM7240 / adum7241 are pending approv al by the organizations listed in table 14 . see table 18 and the insulation lifetime section for recommended maximum working voltages for specific cross - isolation waveforms and insulation levels. table 14. ul (pe nding) recognized under ul 1577 component recognition program 1 single protection, 1000 v rms isolation voltage file e274400 1 in accordance with ul 1577, each ADUM7240 / adum7241 is proof tested by applying an insulation test voltage 1200 v rms for 1 sec (current leakage detection limit = 5 a). insulation and safet y- related specificatio ns table 15. parameter symbol value unit test conditions /com ments rated dielectric insulation voltage 1000 v rms 1- minute duration minimum external air gap (clearance) l(i01) 4.0 mm min measured from input terminals to output terminals, shortest distance through air minimum external tracking (creepage) l(i02) 4.0 mm min measured from input terminals to output terminals, shortest distance path along body minimum internal gap (internal clearance) 2.6 m min distance through insulation tracking resistance (comparative tracking index ) cti >175 v din iec 112/vde 0303 part 1 isolation group iiia material group (din vde 0110, 1/89, table 1) 300 0 0 200 10240-003 safety-limiting current (ma) ambient temperature ( c ) 250 200 150 100 50 50 100 150 figure 3 . thermal derating curve, dependence of safety - limiting values with ambient temperature per din v vde v 0884 - 10 recommended operatin g co nditions table 16. parameter symbol min max unit operating temperature t a ?40 +105 c supply voltages 1 v dd1 , v dd2 3.0 5.5 v input signal rise and fall times 1.0 ms 1 all voltages are relative to their respective ground. see the dc correctness section for in formation about immunity to external magnetic fields. www.datasheet.co.kr datasheet pdf - http://www..net/
ADUM7240/adum7241 data sheet rev. 0 | page 8 of 16 absolute maximum rat ings t a = 25c, unless otherwise noted. table 17. parameter rating storage temperature (t st ) range ?65c to +150 c ambient operating temperature (t a ) range ? 40c to +105c supply voltages (v dd1 , v dd2 ) ?0.5 v to +7.0 v input voltages (v ia , v ib ) 1 ?0.5 v to v ddi + 0.5 v output voltages (v oa , v ob ) 1 ?0.5 v to v ddo + 0.5 v average output current per pin 2 side 1 (i o 1 ) ?10 ma to +10 ma side 2 (i o2 ) ?10 ma to +10 ma common - mode transients 3 ?100 kv/ s to +100 kv/ s 1 v ddi and v ddo refer to the supply voltages on the input and output sides of a given channel, respectively. see the printed circuit board layout section. 2 see figure 3 for maximum rated current values for various temperatures. 3 refers to common - mode transients across the insulation barrier. common - mode transients exceedi ng 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 o ther conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. esd caution table 18. m aximum continuous working voltage 1 parameter max unit constraint ac voltage, bipolar waveform 300 v rms 50- year minimum lifetime dc voltage 300 v dc 50- year minimum lifetime 1 refers to continuous voltage magnitude imposed across the isolation barrier. see the insulation lifetime section for more details. table 19. ADUM7240 truth table (positive logic) 1 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 x u npowered powered h h outputs return to the input state within 1 s of v ddi power restoration. x x powered unpowered indeterminate indeterminate outputs return to the input state within 1 s of v ddo power restoration. 1 h = high, l = low, x = d ont care. table 20. adum7241 truth table (positive logic) 1 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 po wered h l l h powered powered l h x x unpowered powered indeterminate h outputs return to the input state within 1 s of v ddi power restoration. x x powered unpowered h indeterminate outputs return to the input state within 1 s of v ddo power restoration. 1 h = high, l = low, x = dont care. www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADUM7240/adum7241 rev. 0 | page 9 of 16 pin configurations a nd function descript ions 1 8 2 7 3 6 4 5 top view (not to scale) ADUM7240 v dd1 v ia v ib gnd 1 v dd2 v oa v ob gnd 2 10240-004 figure 4. adum 72 40 pin configuration table 21. adum 7240 pin function descriptions pin no. mnemonic description 1 v dd1 3.0 v to 5.5 v supply voltage for isolator side 1. 2 v ia logic input 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 3.0 v to 5.5 v supply voltage for isolator side 2. 1 8 2 7 3 6 4 5 top view (not to scale) adum7241 v dd1 v oa v ib gnd 1 v dd2 v ia v ob gnd 2 10240-005 figure 5. adum 7241 pin configuration table 22. adum 7241 pin function descriptions pin no. mnemonic description 1 v dd1 3.0 v to 5.5 v supply voltage fo r 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 3.0 v to 5.5 v sup ply voltage for isolator side 2. www.datasheet.co.kr datasheet pdf - http://www..net/
ADUM7240/adum7241 data sheet rev. 0 | page 10 of 16 typical performance characteristics 0 5 10 15 20 25 30 dat a r a te (mbps) 3v 5v 10 8 6 4 2 0 current (ma) 10240-006 figure 6 . typical supply current per input channel vs. data rate for 5 v and 3 v operation current (ma) 0 1 2 3 4 0 5 10 15 20 25 30 dat a r a te (mbps) 5v 3v 10240-007 figure 7 . typical supply current pe r output channel vs. data rate for 5 v and 3 v operation (no output load) current (ma) 0 1 2 3 4 0 5 10 15 20 25 30 dat a r a te (mbps) 5v 3v 10240-008 figure 8 . typical supply current per output channel vs. data rate for 5 v and 3 v operation (15 pf output load) current (ma) 0 5 10 15 20 0 5 10 15 20 25 30 dat a r a te (mbps) 5v 3v 10240-009 figure 9 . ty pical ADUM7240 v dd1 supply current vs. data rate for 5 v and 3 v operation 0 5 10 15 20 25 30 dat a r a te (mbps) 3v 5v 5 4 3 2 1 0 current (ma) 10240-010 figure 10 . typical ADUM7240 v dd2 supply current vs. data rate for 5 v and 3 v operation 0 5 10 15 20 25 30 dat a r a te (mbps) 3v 5v 10 8 6 4 2 0 current (ma) 10240-0 1 1 figure 11 . typical adum7241 v dd1 supply current vs. data rate for 5 v and 3 v operation www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADUM7240/adum7241 rev. 0 | page 11 of 16 0 5 10 15 20 25 30 dat a r a te (mbps) 3v 5v 10 8 6 4 2 0 current (ma) 10240-012 figure 12 . typical adum7241 v dd2 supply current vs. data rate for 5 v and 3 v operation www.datasheet.co.kr datasheet pdf - http://www..net/
ADUM7240/adum7241 data sheet rev. 0 | page 12 of 16 applications information printed circuit board layout the ADUM7240 / adum7241 digital isolators require 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 . 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. in applications involving high common-mode transients, it is important to minimize board coupling across the isolation barrier. furthermore, users should design the board layout so that any coupling that does occur affects all pins on a given component side equally. failure to ensure this can cause voltage differentials between pins exceeding the absolute maximum ratings of the device, thereby leading to latch-up or permanent damage. with proper pcb design choices, the ADUM7240 / adum7241 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. refer to an-1109 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 for a low-to-high transition. input ( v ix ) output (v ox ) t plh t phl 50% 50% 10240-013 figure 13. propagation delay parameters pulse width distortion is the maximum difference between these two propagation delay values and is an indication of how accurately the timing of the input signal is preserved. channel-to-channel matching refers to the maximum amount that the propagation delay differs between channels within a single ADUM7240 / adum7241 component. propagation delay skew refers to the maximum amount the propagation delay differs between multiple ADUM7240 / adum7241 components operating under the same conditions. dc correctness positive and negative logic transitions at the isolator input cause narrow (~1 ns) pulses to be sent to the decoder via the transformer. the decoder is bistable and is, therefore, either 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 is sent to ensure dc correctness at the output. if the decoder receives no internal pulses for more than approximately 5 s, the input side is assumed to be unpowered or nonfunctional, and the isolator output is forced to a default high state by the watchdog timer circuit. magnetic field immunity the magnetic field immunity of the ADUM7240 / adum7241 is determined by the changing magnetic field, which induces a voltage in the transformers receiving coil large enough to either falsely set or reset the decoder. the following analysis defines the conditions under which this can occur. the 3 v operating condition of the ADUM7240/ adum7241 is examined because it represents the most susceptible mode of operation. the pulses at the transformer output have an amplitude greater than 1.0 v. the decoder has a sensing threshold at 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 v = ( ?d/dt ) r n 2 ; n = 1, 2, , n where: is the magnetic flux density (gauss). r n is the radius of the n th turn in the receiving coil (cm). n is the number of turns in the receiving coil. given the geometry of the receiving coil in the ADUM7240/ adum7241 and an imposed requirement that the induced voltage be, at most, 50% of the 0.5 v margin at the decoder, a maximum allowable magnetic field at a given frequency can be calculated. the result is shown in figure 14. www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADUM7240/adum7241 rev. 0 | page 13 of 16 100 0 10 0 1 0 1 0 . 1 0 . 0 1 0 . 00 1 1 k 100 m 10 k maximum allowable magnetic flux (kgauss) 100 k 1 m 10 m m a g n e t i c f i e l d f r e q u e nc y ( h z) 10240-014 figure 14 . maximum allowable external magnetic flux density for example, at a magnetic field frequency of 1 mhz, the maximum al lowable magnetic field of 0.5 kgauss induces a voltage of 0.25 v at the receiving coil. this voltage is about 50% of the sensing threshold and does not cause a faulty output transition. si milarly, if such an event occurs during a transmit - ted pulse (and i s of the worst - case polarity), it reduce s the received pulse from >1.0 v to 0.75 v, 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 from t he ADUM7240 / adum7241 transformers. figure 15 shows these allowable current magnitudes as a function of frequency for selected distances. as shown in figure 15 , the ADUM7240/ adum7241 is extremely immune and can be affected only by ext remely large currents operated at high frequency very close to the component. for the 1 mhz example, a 1.2 ka current placed 5 mm away from the ADUM7240 / adum7241 is required to affect the operation of the component. 100 0 10 0 1 0 1 0 . 1 0 . 0 1 1 k 100 m 10 k maximum allowable current (ka) 100 k 1 m 10 m m a g n e t i c f i e l d f r e q u e nc y ( h z) d i s t anc e = 5m m d i s t anc e = 100m m d i s t anc e = 1 m 10240-015 figure 15 . maximum allowable current for various current - to- ADUM7240 / adum7241 spacings note that with extreme combinations of stron g magnetic field and high frequency current , loops formed by printed circuit board traces can induce error voltages large enough to trigger the thresholds of receiver circuitry. care should be taken in the layout of such traces to avoid this possibility. p ower consumption the supply current at a given channel of the ADUM7240 / adum7241 isolator is a function of the supply voltage, the data rate of the channel, an d the output load of the channel. for each input channel, the supply current is given by i ddi = i ddi ( q ) f 0.5 f r i ddi = i ddi(d) (2 f ? f r ) + i ddi ( q ) f > 0.5 f r for each output channel, the supply current is given by i ddo = i ddo ( q ) f 0.5 f r i ddo = ( i ddo ( d ) + (0.5 10 ?3 ) c l v ddo ) (2 f ? f r ) + i ddo( q ) 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 signal frequency (mhz); it is half the input data rate, expressed in units of mbps. f r is the input stage refresh rate (mbps) . i ddi(q) , i ddo(q) 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 sup ply currents as a function of data rate for an unloaded output condition. figure 8 shows the per - channel supply current as a function of data rate for a 15 pf output condition. figure 9 through figure 12 show the total v dd1 and v dd2 supply current as a function of data rate for ADUM7240 and adum7241 channel configurations. insulation lifetime all insulation structures eventually break down when subjected to voltage stress over a sufficiently long period. the rate of insula tion degradation is dependent on the characteristics of the voltag e waveform applied across the insulation. in addition to the testing performed by the regulatory agencies, analog devices carries out an extensive set of evaluations to determine the lifetime of the insulation structure within the ADUM7240 / adum7241 . analog devices performs accelerated life testing using voltage levels higher than the rated continuous working voltage. accelera - tion factors for several operating c onditions are determined. these factors allow calculation of the time to failure at the actual working voltage. the values shown in table 18 summa - rize the working voltage for 50 years of service life . www.datasheet.co.kr datasheet pdf - http://www..net/
ADUM7240/adum7241 data sheet rev. 0 | page 14 of 16 outline d imensions contr ol ling dimen sions ar e in mi lli met ers ; inc h dim ens i ons (in p are nth eses ) are roun ded -off mill imet er e qui v ale nts for refe renc e onl y and are not app ropr i a te for use in desi gn. com pli ant t o jed ec st and ard s ms- 012 -aa 012 407- a 0.2 5 (0. 009 8) 0.1 7 (0.00 67) 1.27 (0.05 00) 0.4 0 (0. 015 7) 0.5 0 (0.01 96) 0.2 5 (0 .0 09 9) 45 8 0 1 .75 (0.06 88) 1.3 5 (0 .0 53 2) sea ting p lane 0.2 5 (0.00 98) 0.1 0 (0 .0 04 0) 4 1 8 5 5.0 0 (0. 196 8) 4 .80 (0. 189 0) 4.00 (0.15 74) 3. 80 (0 .1 49 7) 1.2 7 (0. 050 0) bsc 6. 20 (0 .2 44 1) 5.80 (0.22 84) 0.5 1 (0. 020 1) 0.3 1 (0. 012 2) cop la narit y 0.10 figure 16 . 8 - lead standard small outline package [soic_n] narrow body (r - 8) dimensions shown in millimeters and (inches) ordering guide model 1 n o. of inputs, v dd1 side n o. of inputs, v dd2 side maximum data rate max im um prop agation delay, 5 v temperature range package description package option ADUM7240arz 2 0 1 mbps 75 ns ?40c to +105c 8 - lead soic_n r - 8 ADUM7240arz - rl7 2 0 1 mbps 75 ns ?40c to +105c 8 - lead soic_n, 7 tape and reel r - 8 ADUM7240crz 2 0 25 mbps 50 ns ?40c to +105c 8 - lead soic_n r - 8 ADUM7240crz - rl7 2 0 25 mbps 50 ns ?40c to +105c 8 - lead soic_n, 7 ta pe and reel r - 8 adum7241arz 1 1 1 mbps 75 ns ?40c to +105c 8 - lead soic_n r - 8 adum7241arz - rl7 1 1 1 mbps 75 ns ?40c to +105c 8 - lead soic_n, 7 tape and reel r - 8 adum7241crz 1 1 25 mbps 50 ns ?40c to +105c 8 - lead soic_n r - 8 adum7241crz - rl7 1 1 25 m bps 50 ns ?40c to +105c 8 - lead soic_n, 7 tape and reel r - 8 1 z = rohs compliant part. www.datasheet.co.kr datasheet pdf - http://www..net/
data sheet ADUM7240/adum7241 rev. 0 | page 15 of 16 notes www.datasheet.co.kr datasheet pdf - http://www..net/
ADUM7240/adum7241 data sheet rev. 0 | page 16 of 16 notes ? 2012 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective o wners. d10240 - 0 - 5/12(0) www.datasheet.co.kr datasheet pdf - http://www..net/

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