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high speed industrial can transceiver with bus protection for 24 v systems data sheet adm3051 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 ?2011 analog devices, inc. all rights reserved. features physical layer can transceiver 5 v operation on v cc complies with iso 11898 standard high speed data rates up to 1 mbps short-circuit protection on canh and canl against shorts to power/ground in 24 v systems unpowered nodes do not disturb the bus connect 110 or more nodes on the bus slope control for reduced emi thermal shutdown protection low current standby mode industrial operating temperature range (?40c to +125c) available in 8-lead soic package applications can data buses industrial field networks devicenet applications canopen, cankingdom functional block diagram adm3051 txd rs rxd v ref v cc mode thermal shutdown voltage reference d r canh canl gnd 10029-001 figure 1. general description the adm3051 is a controller area network (can) physical layer transceiver allowing a protocol layer can controller to access the physical layer bus. the adm3051 complies with the iso 11898 standard. it is capable of running at data rates up to 1 mbps. the device has current-limiting and thermal shutdown features to protect against output short circuits and situations where the bus may be shorted to ground or power terminals in 24 v bus power systems. the part is fully specified over the industrial temperature range of ?40c to +125c and is available in an 8-lead soic package. three operating modes are available: high speed, slope control, and standby. pin 8 (rs) is used to select the operating mode. the low current standby mode can be selected by applying a logic high to rs. the device can be set to operate with slope control to limit emi by connecting rs with a resistor to ground to modify the rise and fall of slopes. this mode facilitates the use of unshielded cables. alternatively, disabling slope control by connecting rs to ground allows high speed operation. shielded cables or other measures to control emi are necessary in this mode.
adm3051 data sheet rev. 0 | page 2 of 16 table of contents features .............................................................................................. 1 ? applications....................................................................................... 1 ? functional block diagram .............................................................. 1 ? general description ......................................................................... 1 ? revision history ............................................................................... 2 ? specifications..................................................................................... 3 ? timing specifications .................................................................. 4 ? absolute maximum ratings............................................................ 5 ? esd caution.................................................................................. 5 ? pin configuration and function descriptions............................. 6 ? typical performance characteristics ..............................................7 ? test circuits and switching characteristics................................ 11 ? circuit description......................................................................... 13 ? can transceiver operation..................................................... 13 ? operational modes .................................................................... 13 ? truth tables................................................................................. 13 ? thermal shutdown .................................................................... 13 ? applications information .............................................................. 14 ? outline dimensions ....................................................................... 15 ? ordering guide............................................................................... 15 ? revision history 9/11revision 0: initial revision
data sheet adm3051 rev. 0 | page 3 of 16 specifications all voltages relative to ground (pin 2); 4.5 v v cc 5.5 v. t a = ?40c to +125c, r l = 60 , i rs > ?10 a, unless otherwise noted. all typical specifications are at t a = 25c, v cc = 5 v, unless otherwise noted. table 1. parameter symbol min typ max unit test conditions supply current i cc dominant state 78 ma v txd = 1 v recessive state 10 ma v txd = 4 v; r slope = 47 k standby state 275 a v rs = v cc , i txd = i rxd = i vref = 0 ma, t a < 90c driver logic inputs input voltage high v ih 0.7 v cc v cc + 0.3 v output recessive input voltage low v il ?0.3 +0.3 v cc v output dominant cmos logic input current high i ih ?200 +30 a v txd = 4 v cmos logic input current low i il ?100 ?600 a v txd = 1 v differential outputs recessive bus voltage v canh , v canl 2.0 3.0 v v txd = 4 v, r l = , see figure 23 off-state output leakage current i lo ?2 +2 ma ?2 v < (v canl , v canh ) < 7 v i lo ?10 +10 ma ?5 v < (v canl , v canh ) < 36 v canh output voltage v canh 3.0 4.5 v v txd = 1 v, see figure 23 canl output voltage v canl 0.5 2.0 v v txd = 1 v, see figure 23 differential output voltage v od 1.5 3.0 v v txd = 1 v, see figure 23 v od 1.5 v v txd = 1 v, r l = 45 , see figure 23 v od ?500 +50 mv v txd = 4 v, r l = , see figure 23 short-circuit current, canh i sccanh ?200 ma v canh = ?5 v i sccanh ?100 ma v canh = ?36 v short-circuit current, canl i sccanl 200 ma v canl = 36 v receiver differential inputs voltage recessive v idr ?1.0 +0.5 v ?2 v < v canl , v canh <7 v, see figure 25 , v = 4.75 v to 5.25 v, c = 30 pf cc l ?1.0 +0.4 v ?7 v < v canl , v canh <12 v, see figure 25 , c = 30 pf l voltage dominant v idd 0.9 5.0 v ?2 v < v canl , v canh <7 v, see figure 25 , 25 v, c v cc = 4.75 v to 5. l = 30 pf 1.0 5.0 v ?7 v < v canl , v canh <12 v, see figure 25 , c = 30 pf 1 l input voltage hysteresis v hys 150 mv see figure 26 canh, canl input resistance r in 5 25 k differential in put resistance r diff 20 100 k logic outputs output voltage high v oh 0.8 v cc v cc v i out = ?100 a output vol tage low v ol 0 0.2 v cc v i out = 1 ma v ol 0 1.5 v i out = 10 ma short-circuit current |i os out cc | 120 ma v = gnd or v volt age reference reference output voltage v ref 2.025 3.025 v v rs = 1 v, |i ref | = 50 a v ref cc cc rs ref 0.4 v 0.6 v v v = 4 v, |i | = 5 a stan dby/slope control input voltage for standby mode v stb 0.75 v cc v current for slope control mod e i sl ?10 ope ?200 a slope control mode voltage v 0.4 slope cc cc v 0.6 v v standby, v = 4.75 v to 5.25 v. 1 in cc
adm3051 data sheet rev. 0 | page 4 of 16 timing specifications all voltages are relative to ground (pin 2); 4.5 v v cc 5.5 v. t a = ?40c to +125c, unless otherwise noted. table 2. parameter symbol min typ max unit test conditions driver maximum data rate 1 mbps v rs = 1 v propagation delay from txd on to bus active t ontxd 50 ns v rs = 1 v, r l = 60 , c l = 100 pf, see figure 24 , figure 27 propagation delay from txd off to bus inactive t offtxd 40 80 ns v rs = 1 v, r l = 60 , c l = 100 pf, see figure 24 , figure 27 receiver propagation delay from txd on to receiver active t onrxd 55 120 ns v rs = 1 v, r l = 60, c l = 100 pf, see figure 24 , figure 27 440 600 ns r slope = 47 k, r l = 60 , c l = 100 pf, see figure 24 , figure 27 propagation delay from txd off to receiver inactive t offrxd 90 190 ns r slope = 0 , r l = 60 , c l = 100 pf, see figure 24 , figure 27 290 400 ns r slope = 47 k, r l = 60 , c l = 100 pf, see figure 24 , figure 27 bus dominant to rxd low t drxdl 3 s v rs = 4 v, v txd = 4 v, r l = 60 , c l = 100 pf, see figure 24 , figure 29 canh, canl slew rate |sr| 7 v/s r slope = 47 k, r l = 60 , c l = 100 pf, see figure 24 , figure 27 time to wake-up from standby t wake 20 s v txd = 1 v, see figure 28
data sheet adm3051 rev. 0 | page 5 of 16 absolute maximum ratings table 3. parameter rating v cc ?0.3 v to +7 v digital input voltage txd ?0.3 v to v cc + 0.3 v digital output voltage rxd ?0.3 v to v cc + 0.3 v canh, canl ?36 v to +36 v v ref ?0.3 v to v cc + 0.3 v rs ?0.3 v to v cc + 0.3 v operating temperature range ?40c to +125c storage temperature range ?55c to +150c esd (human body model) on all pins 4 kv lead temperature soldering (10 sec) 300c vapor phase (60 sec) 215c infrared (15 sec) 220c ja thermal impedance 110c/w t j junction temperature 150c 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 affect device reliability. esd caution
adm3051 data sheet rev. 0 | page 6 of 16 pin configuration and fu nction descriptions txd 1 gnd 2 v cc 3 rxd 4 rs 8 canh 7 canl 6 v ref 5 adm3051 top view (not to scale) 10029-009 figure 2. pin configuration table 4. pin function descriptions pin o. mnemonic description 1 txd driver input data. 2 gnd ground. 3 v cc power supply. this pin requires a decoupling capacitor to gnd of 100 nf. 4 rxd receiver output data. 5 v ref reference voltage output. 6 canl low level can voltage input/output. 7 canh high level can voltage input/output. 8 rs slope resistor input.
data sheet adm3051 rev. 0 | page 7 of 16 typical performance characteristics 90 83 ?50 125 propagation delay txd on to receiver active, t onrxd (ns) temperature (c) 10029-010 84 85 86 87 88 89 ?25 0 25 50 75 100 figure 3. propagation delay from txd on to receiver active vs. temperature 92 80 4.5 5.5 propagation delay txd on to receiver active, t onrxd (ns) supply voltage (v) 10029-011 84 82 86 88 90 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 figure 4. propagation delay from txd on to receiver active vs. supply voltage 500 150 ?50 125 propagation delay txd on to receiver active (slope mode), t onrxd (ns) temperature (c) 10029-012 200 250 300 350 400 450 ?25 0 25 50 75 100 figure 5. propagation delay (slope control mode, r slope = 47 k) from txd on to receiver active vs. temperature 560 400 420 440 460 4.5 5.5 propagation delay txd on to receiver active (slope mode), t onrxd (ns) supply voltage (v) 10029-013 500 480 520 540 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 figure 6. propagation delay (slope control mode, r slope = 47 k) from txd on to receiver active vs. supply voltage 180 0 ?50 125 propagation delay txd off to receiver inactive, t offrxd (ns) temperature (c) 10029-014 60 40 20 80 100 120 140 160 ?25 0 25 50 75 100 figure 7. propagation delay from txd off to receiver inactive vs. temperature 160 100 110 4.5 5.5 propagation delay txd off to receiver inactive, t offrxd (ns) supply voltage (v) 10029-015 120 150 140 130 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 figure 8. propagation delay from txd off to receiver inactive vs. supply voltage
adm3051 data sheet rev. 0 | page 8 of 16 350 0 50 150 100 ?50 125 propagation delay txd off t o receiver inactive (slope mode), t offrxd (ns) temperature (c) 10029-016 200 250 300 ?25 0 25 50 75 100 figure 9. propagation delay (slope control mode, r slope = 47 k) from txd off to receiver inactive vs. temperature 315 270 4.5 5.5 propagation delay txd off to receiver inactive (slope mode), t offrxd (ns) supply voltage (v) 10029-017 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 275 280 285 290 295 300 305 310 figure 10. propagation delay (slope control mode, r slope = 47 k) from txd off to receiver inactive vs. supply voltage 184 166 ?50 125 receiver input hysteresis (mv) temperature (c) 10029-018 ?25 0 25 50 75 100 168 170 172 174 176 178 180 182 figure 11. receiver input hysteresis vs. temperature 35 0 5 15 10 ?50 125 propagation delay from txd off to bus inactive, t offtxd (ns) temperature (c) 10029-019 20 25 30 ?25 0 25 50 75 100 figure 12. propagation delay from txd off to bus inactive vs. temperature 29.0 24.5 4.5 5.5 propagation delay from txd off to bus inactive, t offtxd (ns) supply voltage (v) 10029-020 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 25.0 25.5 26.0 26.5 27.0 27.5 28.0 28.5 figure 13. propagation delay from txd off to bus inactive vs. supply voltage 41 33 ?50 125 propagation delay from txd on t o bus active, t ontxd (ns) temperature (c) 10029-021 ?25 0 25 50 75 100 34 35 36 37 38 39 40 figure 14. propagation delay from txd on to bus active vs. temperature
data sheet adm3051 rev. 0 | page 9 of 16 45 0 4.5 5.5 propagation delay from txd on to bus active, t ontxd (ns) supply voltage (v) 10029-022 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5 10 15 20 25 30 35 40 figure 15. propagation delay from txd on to bus active vs. supply voltage 42 30 125 1000 supply current, i cc (ma) data rate (kbps) 10029-023 32 34 36 38 40 250 375 500 625 750 875 figure 16. supply current (i cc ) vs. data rate 2.410 2.355 driver differential output voltage dominant, v od (v) temperature (c) 10029-024 2.360 2.365 2.370 2.375 2.380 2.385 2.390 2.395 2.400 2.405 ?50 125 ?25 0 25 50 75 100 figure 17. driver differential output voltage dominant vs. temperature 3.0 0 4.5 5.5 driver differential output voltage dominant, v od (v) supply voltage (v) 10029-025 1.0 0.5 1.5 2.0 2.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 figure 18. driver differential output voltage dominant vs. supply voltage 4.9915 4.9875 ?50 125 receiver output high voltage, v oh (v) temperature (c) 10029-026 ?25 0 25 50 75 100 4.9880 4.9885 4.9890 4.9895 4.9900 4.9905 4.9910 i out = ?100a figure 19. receiver output high voltage vs. temperature 0.45 0 ?50 125 receiver output low voltage (i out = 10ma), v ol (v) temperature (c) 10029-027 ?25 0 25 50 75 100 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 i out = 10ma i out = 1ma figure 20. receiver output low voltage vs. temperature
adm3051 data sheet rev. 0 | page 10 of 16 2.80 2.40 ?50 125 reference voltage, v ref (v) temperature (c) 10029-030 ?25 0 25 50 75 100 2.45 2.50 2.55 2.60 2.65 2.70 2.75 i ref = +50a i ref = ?50a i ref = +5a i ref = ?5a figure 21. v ref vs. temperature 50 45 40 35 30 25 20 15 10 5 0 0 1020304050607080 slew rate (v/s) resistance, r s (k ? ) 10029-101 figure 22. driver slew rate vs. resistance, r slope
data sheet adm3051 rev. 0 | page 11 of 16 test circuits and switching characteristics txd v od v canh v canl v oc r l r l 2 2 10029-002 canh canl figure 23. driver voltage measurements canh canl txd rxd c l r l 30pf 10029-003 figure 24. switching characteristics measurements c l rxd canh canl v id 10029-006 figure 25. receiver voltage measurements 0.5 0.9 v rxd high low v hys v id (v) 10029-004 figure 26. receiver input hysteresis 0.3v cc 0.9v v or v od 0v 0v v cc 0.5v 0.3v cc v diff rxd v cc txd 0.7v cc 0.7v cc v diff = v canh ? v canl t ontxd t offtxd t onrxd t offrxd 10029-007 figure 27. driver and receiver propagation delay
adm3051 data sheet rev. 0 | page 12 of 16 10029-008 notes: 1. txd = 0v v cc v cc rs rxd 0v 0v t wake figure 28. wake-up delay returning from standby mode v diff rxd v diff = v canh ? v canl t drxdl 0v 1.5 v 0v v cc 10029-005 notes: 1. rs = 4v (standby mode) 2 . txd = 4v figure 29. bus dominant to rxd low (standby mode)
data sheet adm3051 rev. 0 | page 13 of 16 circuit description can transceiver operation a can bus has two states: dominant and recessive. a dominant state is present on the bus when the differential voltage between canh and canl is greater than 0.9 v. a recessive state is present on the bus when the differential voltage between canh and canl is less than 0.5 v. during a dominant bus state, the canh pin is high and the canl pin is low. during a recessive bus state, both the canh and canl pins are in the high impedance state. the driver drives canh high and canl low (dominant state) if a logic low is present on txd. if a logic high is present on txd, the driver output is placed in a high impedance state (recessive state). the driver output states are shown in tabl e 7 . the receiver output is low if the bus is in the dominant state and high if the bus is in the recessive state. if the differential voltage between canh and canl is between 0.5 v and 0.9 v, the bus state is indeterminate and the receiver output may be high or low. the receiver output states for given inputs are listed in table 8 . operational modes three modes of operation are available: high speed, slope control, and standby. rs (pin 8) allows modification of the operational mode by connecting the rs input through a resistor to ground, or directly to ground, or to a can controller, as shown in figure 30 . with rs connected to ground, the output transistors switch on and off at the maximum rate possible in high speed mode, with no modification to the rise and fall slopes. emi in this mode can be alleviated using shielded cables. alternatively, connecting rs to a resistor, r slope , allows slope control mode, with the value of the resistor modifying the rise and fall slopes. the reduced emi allows the use of unshielded cables. applying a logic high to rs initiates a low current standby mode. the transmitter is disabled, and the receiver is connected to a low current. rxd goes low upon receiving dominant bits, allowing an attached microcontroller that detects this to wake the transceiver via pin 8, which returns it to standard operation. the receiver is slower in standby mode and loses the first message at higher bit rates. table 5. mode selection using rs pin (pin 8) mode condition to force resulting voltage/current standby v rs > 0.75 v cc ?i rs < 10 a slope control 10 a < ?i rs < 200 a 0.4 v cc < v rs < 0.6 v cc high speed v rs < 0.3 v cc ?i rs < ?500 a truth tables the truth tables in this section use the abbreviations found in table 6 . table 6. truth table abbreviations letter description h high level l low level x dont care i indeterminate z high impedance (off ) nc disconnected table 7. transmitting supply input outputs v cc txd state canh canl on l dominant h l on h recessive z z on z recessive z z off x z z z table 8. receiving supply inputs output v cc v id = canh ? canl bus state rxd on 0.9 v dominant l on 0.5 v recessive h on 0.5 v < v id < 0.9 v i i on inputs open recessive h off x x i thermal shutdown the adm3051 contains thermal shutdown circuitry that protects the part from excessive power dissipation during fault conditions. shorting the driver outputs to a low impedance source can result in high driver currents. the thermal sensing circuitry detects the increase in die temperature under this condition and disables the driver outputs. the design of this circuitry ensures the disabling of driver outputs upon reaching a die temperature of 150c. as the device cools, reenabling of the drivers occurs at a temperature of 140c.
adm3051 data sheet rev. 0 | page 14 of 16 applications information adm3051 txd rs rxd v ref v cc r t /2 r t /2 r t /2 r t /2 mode thermal shutdown can controller voltage reference d r canh canl gnd 100nf 100nf +5v supply +5v supply r slope c t c t 10029-028 notes 1. r t is equal to the characteristic impedance of the cable used. bus connector figure 30. typical can node using the adm3051 adm3051 txd rxd d r canh canl 10029-029 notes 1. maximum number of nodes: 110. 2. r t is equal to the characteristic impedance of the cable used. adm3051 txd rxd d r canh canl adm3051 txd rxd d r canh canl r t / 2 r t /2 r t /2 r t /2 c l c l figure 31. typical can network
data sheet adm3051 rev. 0 | page 15 of 16 outline dimensions controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design. compliant to jedec standards ms-012-aa 012407-a 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 (0.2441) 5.80 (0.2284) 0.51 (0.0201) 0.31 (0.0122) coplanarity 0.10 figure 32. 8-lead standard small outline package [soic_n] narrow body (r-8) dimensions shown in millimeters and (inches) ordering guide model 1 temperature range package description package option ADM3051CRZ ?40c to +125c 8-lead soic_n r-8 ADM3051CRZ-rl7 ?40c to +125c 8-lead soic_n r-8 eval-adm3051ebz evaluation board 1 z = rohs compliant part.
adm3051 data sheet rev. 0 | page 16 of 16 notes ?2011 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d10029-0-9/11(0)

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