dual-channel isolators with integrated dc/dc converter, 50 mw preliminary technical data adum5240/adum5241/adum5242 rev. prn november 17, 2006 information furnished by analog devices is believed to be a ccurate 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 chan ge without notice. no license is granted by implication or otherwise under any patent or patent ri ghts of analog devices. trademarks and registered trademarks are the prop erty 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: 781.326.8703 ? 2006 analog devices, inc. all rights reserved. features integrated isolated dc/dc converter regulated 5v/10 ma output dual dc-to-10 mbps (nrz) signal isolation channels narrow body soic 8-lead package high temperature operation: 105c precise timing characteristics: 3 ns maximum pulse-width distortion 3 ns maximum channel-to-channel matching 70 ns maximum propagation delay high common-mode transient immunity: > 25 kv/s safety and regulatory approvals (pending) ul recognition 2500 v rms for 1 minute per ul 1577 csa component acceptance notice #5a vde certificate of conformity din en 60747-5-2 (vde 0884 part 2): 2003-01 din en 60950 (vde 0805): 2001-12; din en 60950: 2000 v iorm = 425 v peak general description the adum524x 1 are dual-channel digital isolators having an integrated dc/dc converter. based on analog devices i coupler? technology, the dc/dc converter provides up to 50 mw of regulated, isolated power at +5v. this eliminates the need for a separate isolated dc/dc converter in low-power isolated designs. analog devices chip-scale transformer i coupler ? technology is used both for the isolation of the logic signals as well as for the dc/dc converter. the result is a small form-factor total-isolation solution. adum524x units may be used in combination or with other i coupler products to achieve greater channel counts. the adum524x isolators provide two independent isolation channels in a variety of channel configurations and data rates (see ordering guide) operating off a 5v input supply. 1 protected by u.s. patents 5,952, 849 6,873,065 and 7,075,329 other patents pending. functional block diagram gnd iso v iso v oa 7 v ob 6 decode encode decode encode 5 osc. rect. 8 v dd gnd v ia 2 v ib 3 4 1 figure 1. adum5240 functional block diagram gnd iso v iso v ia 7 v ob 6 encode decode decode encode 5 osc. rect. 8 v dd gnd v oa 2 v ib 3 4 1 figure 2. adum5241 functional block diagram gnd iso v iso v ia 7 v ib 6 encode decode encode decode 5 osc. rect. 8 v dd gnd v oa 2 v ob 3 4 1 gnd iso v iso v ia 7 v ib 6 encode decode encode decode 5 osc. rect. 8 v dd gnd v oa 2 v ob 3 4 1 figure 3. adum5242 functional block diagram
adum5240/adum5241/adum5242 preliminary technical data rev. prn | page 2 of 10 specifications electrical characteristics 1 all voltages are relative to their respective ground. all min/max specifications apply over the entire recommended operating r ange, unless otherwise noted. all typical specifications are at t a = 25c, v dd = 5.0 v, v iso = 5.0 v. table 1. parameter symbol min typ max unit test conditions with dc/dc converter enabled: dc to 2 mbps data rate: logic signal freq. 1 mhz setpoint v iso 5.0 5.5 v maximum output current i iso(max) 10 ma input supply current 2 at maximum output current i dd(max) 125 ma i iso = 10 ma, logic signal freq. 1 mhz with no output current i dd(0) 95 ma i iso = 0 10 mbps data rate: logic signal freq. = 5 mhz setpoint v iso 4.5 5.5 v maximum output current i iso(max, 10) adum5240 8.5 ma adum5241 7.0 ma adum5242 5.7 ma input supply current 3 at maximum output current i dd(max) 125 ma i iso(max, 10) , logic signal freq. = 5 mhz with no output current i dd(0) 100 ma i iso = 0, logic signal freq. = 5 mhz with dc/dc converter disabled: dc to 2 mbps i dd(2) logic signal freq.1 mhz input supply current, v dd 2 adum5240 3.3 ma adum5241 2.7 ma adum5242 2.2 ma input supply current, v iso 2 adum5240 1.6 ma adum5241 3.1 ma adum5242 2.5 ma 10 mbps i dd(10) i iso =0, logic signal freq.5 mhz input supply current, v dd 2 adum5240 6.1 ma adum5241 5.0 ma adum5242 4.0 ma input supply current, v iso 2 adum5240 3.8 ma adum5241 5.0 ma adum5242 6.2 ma enable threshold 4 v enable 4.5 v disable threshold 4 v disable 4.0 4.5 v input currents i ia , i ib ?10 +0.01 +10 a logic high input threshold v ih 0.7 v iso v logic low input threshold v il 0.3 v iso v logic high output voltages v oah , v obh v dd , ? 0.1 5.0 v i ox = ?20 a, v ix = v ixh v dd , ? 0.5 4.8 v i ox = ?4 ma, v ix = v ixh logic low output voltages v oal , v obl 0.0 0.1 v i ox = 20 a, v ix = v ixl 0.0 0.4 v i ox = 4 ma, v ix = v ixl
preliminary technical data adum5240/adum5241/adum5242 rev. prn | page 3 of 10 parameter symbol min typ max unit test conditions ac specifications minimum pulse width 5 pw 100 ns c l = 15 pf, cmos signal levels maximum data rate 6 10 mbps c l = 15 pf, cmos signal levels propagation delay 7 t phl , t plh 25 70 ns c l = 15 pf, cmos signal levels pulse-width distortion, |t plh ? t phl | 7 pwd 3 ns c l = 15 pf, cmos signal levels propagation delay skew 8 t psk 45 ns c l = 15 pf, cmos signal levels channel-to-channel matching, codirectional channels 9 t pskcd 3 ns c l = 15 pf, cmos signal levels channel-to-channel matching, opposing-directional channels 10 t pskcd 15 ns c l = 15 pf, cmos signal levels ripple 11 200 mv p-p enable time 12 t enable 50 ns disable time 12 t disable 50 ns output rise/fall time (10% to 90%) t r /t f 2.5 ns c l = 15 pf, cmos signal levels common-mode transient immunity at logic high output |cm h | 25 35 kv/s v ix = v dd , v iso , v cm = 1000 v, transient magnitude = 800 v common-mode transient immunity at logic low output |cm l | 25 35 kv/s v ix = 0 v, v = 1000 v, transient magnitude = 800 v refresh frequency f r 1.0 mhz 1 all voltages are relative to their respective ground. 2 supply current values are specified with no load present on the digital outputs. 3 supply current values are specified with no load present on the digital outputs. 4 enable/disable threshold is the voltage at which the internal dc/dc converter is enabled/disabled. 5 the minimum pulse width is the shortest pulse width at which the specified pulse-width distortion is guaranteed. 6 the maximum data rate is the fastest data rate at which the specified pulse-width distortion is guaranteed. 7 t phl propagation delay is measured from the 50% level of the falling edge of the v ix signal to the 50% level of the falling edge of the v ox signal. t plh propagation delay is measured from the 50% level of the rising edge of the v ix signal to the 50% level of the rising edge of the v ox signal. 8 t psk is the magnitude of the worst-case difference in t phl and/or t plh that is measured between units at the same operating temperat ure, supply voltages, and output load within the recommended operating conditions. 9 channel-to-channel matching is the absolute value of the difference in propagation delays between the two channels when operat ed with identical loads. 10 channel-to-channel matching is the absolute value of the difference in propagation delays between the two channels when operat ed with identical loads. 11 ripple occurs at frequency corresponding to the input signal data rate or the refresh frequency for data rates below 1mbps. 12 enable time is the duration from when input supply voltage rises above the enable threshold to when the internal dc/dc convert er starts charging an external load. disable time is the duration from when the input supply voltage drops below the disable threshold to when the internal dc/dc co nverter stops charging an external load package characteristics table 2. parameter symbol min typ max unit test conditions resistance (input-output) r i-o 10 12 capacitance (input-output) c i-o 1.0 pf f = 1 mhz input capacitance c i 4.0 pf ic junction-to-air thermal resistance ja 150 c/w
adum5240/adum5241/adum5242 preliminary technical data rev. prn | page 4 of 10 regulatory information the adum5240/5241/5242 will be approved by the following organizations upon product release: table 3. ul (pending) csa (pending) vde (pending) recognized under 1577 component recognition program 1 basic insulation, 2500 v rms isolation rating approved under csa component acceptance notice #5a basic insulation per csa 60950-1-03 and iec 60950-1, 300 v rms (425 v peak) maximum working voltage certified according to din en 60747-5-2 (vde 0884 part 2):2003-01 2 basic insulation,300 v rms (425 v peak) maximum working voltage file e214100 file 205078 file 2471900-4880-0001 1 in accordance with ul1577, each adum524x is proof-tested by applying an insulation test voltage 3000 v rms for 1 second (cur rent leakage detectio n limit = 5 a). 2 in accordance with din en 60747-5- 2, each adum524x is proof-tested by applying an insulation te st voltage 1050 v peak for 1 second (partial discharge detection limit = 5 pc). insulation and safety-related specifications table 4. parameter symbol value unit conditions rated dielectric insulation voltag e 2500 v rms 1 minute duration minimum external air gap (clearance) l(i01) 4.90 min mm measured from input terminals to output terminals, shortest distance through air minimum external tracking (creepage) l(i02) 4.01 min mm measured from input terminals to output terminals, shortest distance path along body minimum internal gap (internal clearance) 0.017 min mm insulation distance through insulation tracking resistance (comparative tracking index) cti >175 v din iec 112/vde 0303 part 1 isolation group iiia material group (din vde 0110, 1/89, table 1)
preliminary technical data adum5240/adum5241/adum5242 rev. prn | page 5 of 10 din en 60747-5-2 (vde 0884 part 2) insulation characteristics table 5. description symbol characteristic unit installation classification per din vde 0110 for rated mains voltage 150 v rms i?iv for rated mains voltage 300 v rms i?iii climatic classification 40/105/21 pollution degree (din vde 0110, table 1) 2 maximum working insulation voltage v iorm 425 v peak input to output test voltage, method b1 v pr 797 v peak v iorm 1.875 = v pr , 100% production test, t m = 1 sec, partial discharge < 5 pc input to output test voltage, method a v pr after environmental tests subgroup 1 v iorm 1.6 = v pr , t m = 60 sec, partial discharge < 5 pc 680 v peak after input and/or safety test subgroup 2/3 v iorm 1.2 = v pr , t m = 60 sec, partial discharge < 5 pc 510 v peak highest allowable overvoltage (transient overvoltage, t tr = 10 sec) v tr 4000 v peak safety-limiting values (maximum value allowed in the event of a failure; also see the thermal derating curve, figure 4) case temperature t s 150 c side 1 current i s1 160 ma side 2 current i s2 170 ma insulation resistance at t s , v io = 500 v r s >10 9 note that the * marking on the package denotes din en 60747-5-2 approval for a 425 v peak working voltage. this isolator is suitable for basic isolation only within the safety limit data. maintenance of the safety data is ensured by p rotective circuits. [figure to be added] figure 4. thermal derating curve, dependence of safety limiting values on case temperature, per din en 60747-5- 2 recommended operating conditions table 6. parameter symbol min max unit operating temperature t a ?40 +105 c supply voltages 1 v dd , dc/dc conv. enabled v dd 4.5 5.5 v v dd , dc/dc conv. disabled v dd 2.7 4.0 v v iso , dc/dc conv. disabled v iso 2.7 5.5 v input signal rise and fall times 1.0 ms input supply slew rate 10 v/ms 1 all voltages are relative to their respective ground.
adum5240/adum5241/adum5242 preliminary technical data rev. prn | page 6 of 10 absolute maximum ratings ambient temperature = 25c, unless otherwise noted. table 7. parameter symbol min max unit storage temperature t st ?55 150 c ambient operating temperature t a ?40 105 c supply voltages 1 v dd , v iso ?0.5 7.0 v input voltage 1 v ia , v ib ?0.5 v dd/iso + 0.5 v output voltage 1 v oa , v ob ?0.5 v dd/iso + 0.5 v average output current, per pin 2 i o ma common-mode transients 3 ?100 +100 kv/s 1 all voltages are relative to their respective ground. 2 see figure 4 for maximum rated current values for various temperatures. 3 refers to common-mode transients across the insulation barrier. common-mode transients exceeding the absolute maximum rating m ay 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 on ly; functional operation of the device at these or any other conditions above those listed in the operational sections of this spec ification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. esd caution esd (electrostatic discharge) sensitive device. electros tatic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge wi thout detection. although this product features proprietary esd protection circuitry, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality. table 8. truth table, adum5240 v dd state dc/dc converter v iso state v ia input v ib input v oa output v ob output powered enabled powered (internally) h h h h powered enabled powered (internally) l l l l powered enabled powered (internally) h l h l powered enabled powered (internally) l h l h powered disabled powered (externally) h h h h powered disabled powered (externally) l l l l powered disabled powered (externally) h l h l powered disabled powered (externally) l h l h powered disabled unpowered x x z z unpowered disabled powered (externally) x x l l unpowered disabled unpowered x x z z
preliminary technical data adum5240/adum5241/adum5242 rev. prn | page 7 of 10 table 9. truth table, adum5241 v dd state dc/dc converter v iso state v ia input v ib input v oa output v ob output powered enabled powered (internally) h h h h powered enabled powered (internally) l l l l powered enabled powered (internally) h l h l powered enabled powered (internally) l h l h powered disabled powered (externally) h h h h powered disabled powered (externally) l l l l powered disabled powered (externally) h l h l powered disabled powered (externally) l h l h powered disabled unpowered x x l z unpowered disabled powered (externally) x x z l unpowered disabled unpowered x x z z table 10. truth table, adum5242 v dd state dc/dc converter v iso state v ia input v ib input v oa output v ob output powered enabled powered (internally) h h h h powered enabled powered (internally) l l l l powered enabled powered (internally) h l h l powered enabled powered (internally) l h l h powered disabled powered (externally) h h h h powered disabled powered (externally) l l l l powered disabled powered (externally) h l h l powered disabled powered (externally) l h l h powered disabled unpowered x x l l unpowered disabled powered (externally) x x z z unpowered disabled unpowered x x z z
adum5240/adum5241/adum5242 preliminary technical data rev. prn | page 8 of 10 pin configuration and fu nction descriptions top view (not to scale) 8 7 6 5 1 2 3 4 v dd v ia gnd v iso v ob gnd iso adum5240 v oa v ib top view (not to scale) 8 7 6 5 1 2 3 4 v dd v ia gnd v iso v ob gnd iso adum5240 v oa v ib figure 5. adum5240 pin configuration top view (not to scale) 8 7 6 5 1 2 3 4 v dd v oa gnd v iso v ob gnd iso adum5241 v ia v ib top view (not to scale) 8 7 6 5 1 2 3 4 v dd v oa gnd v iso v ob gnd iso adum5241 v ia v ib figure 6. adum5241 pin configuration top v ie w (not to scale) 8 7 6 5 1 2 3 4 v dd v oa gnd v iso v ib gnd iso adum 5242 v ia v ob figure 7. adum5242 pin configuration table 11. adum5240 pin function descriptions pin no. mnemonic function 1 v dd1 supply voltage for isolator side 1, 4.5 v to 5.5 v (dc/dc enabled), 2.7 v to 4.0 v (dc/dc disabled) 2 v ia logic input a. 3 v ib logic input b. 4 gnd ground. ground reference for isolator side 1. 5 gnd iso isolated ground. ground reference for isolator side 2. 6 v ob logic output b. 7 v oa logic output a. 8 v iso isolated supply voltage for isolator side 2, 5.0 v to 5.5 v output (dc/dc enabled), 4.5 v to 5.5 v input (dc/dc disabled) table 12. adum5241 pin function descriptions pin no. mnemonic function 1 v dd1 supply voltage for isolator side 1, 4.5 v to 5.5 v (dc/dc enabled), 2.7 v to 4.0 v (dc/dc disabled) 2 v oa logic output a. 3 v ib logic input b. 4 gnd ground. ground reference for isolator side 1. 5 gnd iso isolated ground. ground reference for isolator side 2. 6 v ob logic output b. 7 v ia logic input a. 8 v iso isolated supply voltage for isolator side 2, 5.0 v to 5.5 v output (dc/dc enabled), 4.5 v to 5.5 v input (dc/dc disabled) table 13. adum5242 pin function descriptions pin no. mnemonic function 1 v dd1 supply voltage for isolator side 1, 4.5 v to 5.5 v (dc/dc enabled), 2.7 v to 4.0 v (dc/dc disabled) 2 v oa logic output a. 3 v ob logic output b. 4 gnd ground. ground reference for isolator side 1. 5 gnd iso isolated ground. ground reference for isolator side 2. 6 v ib logic input b. 7 vi a logic input a. 8 v iso isolated supply voltage for isolator side 2, 5.0 v to 5.5 v output (dc/dc enabled), 4.5 v to 5.5 v input (dc/dc disabled)
preliminary technical data adum5240/adum5241/adum5242 rev. prn | page 9 of 10 application information dc/dc converter the adum524x can be operated with the internal dc/dc enabled or disabled. with the internal dc/dc converter enabled, the pin 8 isolated supply provides output power as well as power to the parts isolated-side circuitry. since the power consumed by the adum524x is a function of the input signals data rate, the available isolated output power is determined by the data rate at which the parts data channels are operating. the adum524xs internal dc/dc converter state is controlled by the input v dd voltage as defined in table 6. in normal operating mode, v dd is set between 4.5 v and 5.5 v and the internal dc/dc converter is enabled. when/if it is desired to disable the dc/dc converter, v dd is lowered to a value between 2.7 v and 4.0 v. in this mode, the v iso supply is supplied by the user and the adum524xs signal channels continue to operate normally. guidelines for pre-production samples pre production samples meet all data sheet specifications; however, a limitation in the internal circuitry of the adum524x prevents proper start-up under all load conditions. this limitation will be corrected in the final product. at certain temperature and load conditions the adum524x will not regulate its v iso output to the 5.25v target voltage at converter start-up. the output stabilizes at just under 4v with no external load or as low as 3v with an external load. if the converter starts successfully, the output voltage will continue to regulate properly even as temperature and load conditions change. the start-up issue is affected by several circuit and environmental conditions: slew rate applied to v dd1 , ambient temperature, and v iso capacitive load. the recommendations in the pc board layout section address the v dd1 slew rate dependence in most cases. good results have been obtained when the system power supply slews at ~0.5v/ s. faster slew rates can be tolerated but should be verified over temperature. table 14 contains guidelines for the maximum reliable start-up temperature for two common values of load capacitance. the v iso start-up issue is strongly temperature dependant. the adum542x dissipates between 40 and 63mw under normal operation, causing the internal temperature of the device to be higher than ambient during normal operation. a warm start after the device has reached its equilibrium temperature is the worst case condition and will give the highest probability of incorrect regulation of output voltage. the guidelines in table 14 are based on warm start at full load. cold start will be successful at higher ambient temperatures. when these guidelines are followed, pre-production samples may be used for prototype and evaluation. as mentioned above this issue will be corrected in final silicon and the adum524x will operate at specified load and temperature conditions. table 14. special usage conditions for pre-production devices max temperature by load capacitance 1 10nf 100nf adum5240 105 c not recommended adum5241 105 c 65 c adum5242 80 c 80 c 1 value of load capacitor c3 in figure 8 pc board layout the adum524x digital isolators require no external interface circuitry for the logic interfaces. power supply bypassing is strongly recommended at the input and output supply pins as shown in figure 8. for the adum5240 and adum5241, a bypass capacitance (c 1 ) of 44 f is required at the v dd input to ensure proper power-up. for all models bypass capacitance is recommended with c 2 =0.1 f on the non-isolated side and c 3 =10 nf on the isolated side. due to high inductance associated with larger capacitors such as c 1 , it is recommended that both c 1 and c 2 be used on the adum5240 and adum5241. the bypass capacitors should be placed as close as possible to the adum524x device. in cases where emi is a concern, inductance should be added between the system supply and ground and the adum524x supply and ground as shown in figure 8. inductance can be added in the form of discrete inductors or ferrite beads, and its recommended the value correspond to an impedance between 50 and 100 at approximately 300mhz. figure 8. recommended application circuit. c 1 may be omitted for adum5242, and l 1 and l 2 should be included where emi is a concern.
adum5240/adum5241/adum5242 preliminary technical data rev. prn | page 10 of 10 pr06014-0-11/06(prn) outline dimensions 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 0.50 (0.0196) 0.25 (0.0099) 45 8 0 1.75 (0.0688) 1.35 (0.0532) seating plane 0.25 (0.0098) 0.10 (0.0040) 4 1 85 5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497) 1.27 (0.0500) bsc 6.20 (0.2440) 5.80 (0.2284) 0.51 (0.0201) 0.31 (0.0122) coplanarit y 0.10 controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design compliant to jedec standards ms-012aa figure 9. 8-lead standard small outline package [soic]narrow body (r-8) dimensions shown in millimeters (inches) ordering guide model number of inputs, v dd1 side number of inputs, v dd2 side maximum data rate (mbps) temperature range (c) package option 1 adum5240brz 2,3 2 0 10 ?40 to +105 r-8 adum5241brz 2, 3 1 1 10 ?40 to +105 r-8 ADUM5242BRZ 2, 3 0 2 10 ?40 to +105 r-8 1 r-8 = 8-lead narrow body soic. 2 tape and reel are available. the additi on of an -rl7 suffix designates a 7 (1,000 unit s) tape and reel option. 3 z = pb-free part.
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