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data sheet broadcom av02-3563en december 18, 2017 description the broadcom ? acpl-c87b/c87a/c870 voltage sensors are optical isolation amplifie rs designed spec ifically for voltage sensing. its 2v input range and high 1-g? input impedance, makes it well suited for isolated voltage sensing requirements in electronic po wer converters applications, including motor drives and renewable energy systems. in a typical voltage sensing implemen tation, a resistive voltage divider is used to scale the dc-link voltage to suit the input range of the voltage sensor. a differential output voltage that is proportional to the input vo ltage is created on the other side of the optical isolation barrier. for general applications, the acpl-c87a (1% gain tolerance) and the ACPL-C870 (3% gain tolerance) are recommended. for high preci sion requirements, the acpl-c87b (0.5% gain tolerance) can be used. the acpl-c87b/c87a/c870 family o perates from a single 5v supply and provides excellent linearity. an active-high shutdown pin is available which reduces the idd1 current to only 15a, making them suitab le for battery-powered and other power-sensit ive applications. the high common-mode transient immunity (15 kv/ms) of the acpl-c87b/c87a/c870 p rovides the precision and stability needed to ac curately monitor dc-link voltage in high noise environments. combi ned with superior optical coupling technology, the acpl-c87b/c87a/c870 implements sigma-delta ( - ) modulation, chopper stabilized amplifiers, and diff erential outputs to provide unequaled isolation-mode noise rejection, low offset, high gain accuracy and sta bility. this performance is delivered in a compact, auto-insertable stretched so-8 (sso-8) package that meets worldwide regulatory safety standards. features ? advanced sigma-delta ( - ) modulation technology ? unity gain 1 v/v, 0.5 % high gain accuracy (acpl-c87b) ? 1-g? input impedence ? 0 to 2v nominal input range ? C35 ppm/c low gain frift ? 21 v /c offset voltage drift ? 0.1% non-linearity max ? active-high shutdown pin ? 100-khz wide bandwidth ? 3v to 5.5v wide supply range for output side ? C40c to +105c operating temperature range ? 15 kv/s common-mode transient immunity ? compact, auto-insertable stretched so-8 package ? safety and regulatory approvals: C iec/en/din en 60747-5-5: 1414 v peak working insulation voltage C ul 1577: 5000 v rms /1 min double protection rating C csa: component acceptance notice #5 applications ? isolated voltage sensing in ac and servo motor drives ? isolated dc-bus voltage sensing in solar inverters, wind turbine inverters ? isolated sensor interfaces ? signal isolation in dat a acquisition systems ? general purpose voltage isolation caution! it is advised that norma l static precautions be taken in handling and assembly of this component to prevent damage and/or degradation which may be induced by esd. acpl-c87b, acpl-c87a, ACPL-C870 precision optically isolated voltage sensor
broadcom av02-3563en 2 acpl-c87b, acpl-c87a, ACPL-C870 data sheet precision optically isolated voltage sensor functional diagram figure 1: functional diagram note: a 0.1-f bypass capaci tor must be connected between pins 1 and 4 and between pins 5 and 8. gnd2 v dd2 v out+ v outC v dd1 gnd1 shield v in 1 2 3 4 5 6 7 8 shdn table 1: pin description pin no. symbol description 1v dd1 supply voltage fo r input side (4.5v to 5.5v), rela tive to gnd1 2v in voltage input 3 shdn shutdown pin (active high) 4 gnd1 input side ground 5 gnd2 output side ground 6v outC negative output 7v out+ positive output 8v dd2 supply voltage for output side (3v to 5.5v), referenced to gnd2 ordering information acpl-c87b/c87a/c870 is ul recognized with 5000 v rms /1 minute rating per ul 1577. to order, choose a part number from the part number column and combine with the desired opti on from the option column to form an order entry. example: acpl-c87a-500e to ord er product of surface mount package in tap e and reel packaging with iec/en/din en 60747-5-5 safety approval and rohs compliance. contact your broadcom sales repres entative or authorized distri butor for information. table 2: ordering information part number option package surface mount tape and reel iec/en/din en 60747-5-5 quantity (rohs compliant) acpl-c87b acpl-c87a ACPL-C870 -000e stetched so-8 x x 80 per tube -500e x x x 1000 per reel
broadcom av02-3563en 3 acpl-c87b, acpl-c87a, ACPL-C870 data sheet precision optically isolated voltage sensor package outline drawing stretched so-8 package (sso-8) figure 2: sso-8 package recommended pb-free ir profile recommended reflow condition as per jedec standard, j-std-020 ( latest revision). non-ha lide flux should be used. regulatory information the acpl-c87b/c87a/c870 is appro ved by the following organizati ons. iec/en/din en 60747-5-5 approval with maximum working insulation voltage v iorm = 1414 v peak. ul approval under ul 1577, component recognition program up to v iso = 5000 v rms /1 min. file 55361. csa approval under csa component acceptance notice #5, file ca 8832 4 5.850 0.254 (0.230 0.010) 5 6 7 8 4 3 2 1 dimensions in millimeters and (inches). note: lead coplanarity = 0.1 mm (0.004 inches). floating lead protrusion = 0.25mm (10mils) max. 6.807 0.127 (0.268 0.005) recommended land pattern 12.650 (0.498) 1.905 (0.075) 3.180 0.127 (0.125 0.005) 0.381 0.127 (0.015 0.005) 1.270 (0.050) bsg 7 0.254 0.100 (0.010 0.004) 0.750 0.250 (0.0295 0.010) 11.50 0.250 (0.453 0.010) 1.590 0.127 (0.063 0.005) 0.450 (0.018) 45 rohs-compliance indicator 0.64 (0.025) 0.200 0.100 (0.008 0.004) part number date code c87b yww eee lot id
broadcom av02-3563en 4 acpl-c87b, acpl-c87a, ACPL-C870 data sheet precision optically isolated voltage sensor insulation and safety related specifications iec/en/din en 60747-5-5 insulation characteristics table 3: insulation and safe ty related specifications parameter symbol value units conditions minimum external air gap (external clearance) l(101) 8.0 mm measured from input t erminals to output terminals, shortest distance through air minimum external tracking (external creepage) l(102) 8.0 mm measured from input t erminals to output terminals, shortest distance path along body minimum internal plastic gap (internal clearance) 0.5 mm through insulation dista nce, conductor to conductor, usually the direct distance between the photoemitter and photodetector inside t he optocoupler cavity 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) table 4: iec/en/din en 60747- 5-5 insulation characteristics a a. insulation characteristics are guaranteed only within the saf ety maximum ratings, which must be ensured by protective circui ts within the application. description symbol value units installation classification per din vde 0110/1.89, table 1 for rated mains voltage 150 v rms i-iv for rated mains voltage 300 v rms i-iv for rated mains voltage 450 v rms i-iv for rated mains voltage 600 v rms i-iv for rated mains voltage 1000 v rms i-iii climatic classification 55/105/21 pollution degree (din vde 0110/1.89) 2 maximum working in sulation voltage v iorm 1414 v peak input to output test voltage, method b v iorm 1.875 = v pr , 100% production test with t m = 1 second, partial discharge < 5 pc v pr 2652 v peak input to output test voltage, method a v iorm 1.6 = v pr , type and sample test, t m = 10 seconds, partial discharge < 5 pc v pr 2262 v peak highest allowable overvoltage (transient overvoltage, t ini = 60 seconds) v iotm 8000 v peak safety-limiting values (maximum values allowed in the event of a failure) case temperature t s 175 c input current i s,input 230 ma output power p s,output 600 mw insulation resi stance at t s , v io = 500v r s 10 9 ?
broadcom av02-3563en 5 acpl-c87b, acpl-c87a, ACPL-C870 data sheet precision optically isolated voltage sensor absolute maximum rating recommended operating conditions table 5: absolute maximum rating parameter symbol min. max. units storage temperature t s C55 +125 c ambient operating temperature t a C40 +105 c supply voltage v dd1 , v dd2 C0.5 6.0 v steady-state input voltage a , b a. dc voltage of up to C2v on the inputs does not cause latch-up or damage to the device. b. absolute maximum dc current on the inputs = 100 ma, no latch- up or device damage occurs. v in C2 v dd1 + 0.5 v two-second transient input voltage c c. transient voltage of 2 seconds up to C6v on the inputs does n ot cause latch-up or damage to the device. v in C6 v dd1 + 0.5 v logic input v sd C0.5 v dd1 + 0.5 v output voltages v out+ , v outC C0.5 v dd2 + 0.5 v lead solder temperature 260 c fo r 10 seconds, 1.6 mm below seat ing plane table 6: recommended operating conditions parameter symbol min. max. units ambient operating temperature t a C40 +105 c v dd1 supply voltage v dd1 4.5 5.5 v v dd2 supply voltage v dd2 3.0 5.5 v input voltage range a a. 2v is the nominal input range. full scale input range (fsr) i s 2.46v. v in 02.0v shutdown enable voltage v sd v dd1 C 0.5 v dd1 v
broadcom av02-3563en 6 acpl-c87b, acpl-c87a, ACPL-C870 data sheet precision optically isolated voltage sensor electrical specifications unless otherwise noted, t a = C40c to +105c, v dd1 = 4.5v to 5.5v, v dd2 = 3.3v to 5.5v, v in = 0v to 2v, and v sd = 0v. table 7: electrica l specifications parameter symbol min. typ. a max. unit test conditions/notes figure note dc characteristics input offset voltage v os C9.9 C0.3 9.9 mv t a = 25c 3 , 4 magnitude of input offset change vs. temperature |dv os /dt a | 21 v/ct a = C40c to +105c; direct short across inputs. 5 gain (acpl-c87b, 0 .5%) g0 0.995 1 1.005 v/v t a = 25c; v dd2 = 5v; 6 , 7 b 0.994 0.999 1.004 v/v t a = 25c; v dd2 = 3.3v; 6 , 7 b gain (acpl-c87a, 1%) g1 0.99 1 1.01 v/v t a = 25c 6 , 7 b gain (ACPL-C870, 3%) g3 0.97 1 1.03 v/v t a = 25c 6 , 7 b magnitude of gain change vs. temperature dg/dt a C35ppm/ct a = C40c to +105c 8 nonlinearity nl 0.05 0.1 % v in = 0 to 2v, t a = 25c 9 , 10 magnitude of nl change vs. temperature |dnl/dt a | 0.0002 %/c t a = C40c to +105c 11 inputs and outputs recommended input range vi nr 2 v referenced to gnd1 full-scale differential voltage input range fsr 2.46 v referenced to gnd1 shutdown logic low input voltage v il 0.8 t a = 25c shutdown logic high input voltage v ih v dd C 0.5 5 t a = 25c input bias current i in C0.1 C0.0015 a v in = 0 v magnitude of i in change vs. temperature di in /dt a 1na/c equivalent input impedance r in 1000 m? output common-mode voltage v ocm 1.23vv out+ or v outC output voltage range v outr vocm 1.23 vv sd = 0v 13 c output short-circuit current |i osc | 30mav out+ or v outC , shorted to gnd2 or v dd2 output resistance r out 36?v out+ or v outC ac characteristics vout noise n out 0.013 mvrms vin = 0v; output low-pass filtered to 180 khz. 12 d small-signal bandwidth (C3 db) f C3 db 70 100 khz guaranteed by design input to output propagation delay 50% to 10% t pd10 2.2 3.0 s step input 18 50% to 50% t pd50 3.7 5.5 s step input 18 50% to 90% t pd90 5.3 6.5 s step input 18
broadcom av02-3563en 7 acpl-c87b, acpl-c87a, ACPL-C870 data sheet precision optically isolated voltage sensor package characteristics output rise/fall time (10% to 90%) t r/f 2.7 4.0 s step input (t pd90 C t pd10 ) shutdown delay t sd 25 40 s vin = 2v 17 enable delay t on 150200s common mode transient i mmunity cmti 10 15 kv/s v cm = 1 kv, t a = 25c power supply rejection psr C78 db 1 vpp 1-khz sine wave ripple on v dd1 , differential output power supplies input side supply current idd1 10.5 15 ma v sd = 0v 15av sd = 5v idd2 6.5 12 ma 5v supply 6.1 11 ma 3.3v supply a. all typical values are under typical operating conditions at t a = 25c, v dd1 = 5v, v dd2 = 5v. b. gain is defined as the slope of the best-fi t line of diff er ential output voltage (v out+ C v out- ) versus input voltage over the nominal range, with offset error adjusted. c. when v sd = 5v or when shutdown is enabled, v out + is close to 0v and v out- is at close to 2.46v. this is similar to when v dd1 is not supplied. d. noise is measured at the outpu t of the differential to single -ended post amplifier. table 8: packag e characteristics parameter symbol min typ max units test conditions note input-output momentary withstand voltage v iso 5000 v rms rh < 50%, t = 1 min., t a = 25c a , b a. in accordance with ul 1577, each optocoupler is proof-tested by applying an insulation test voltage 6000 v rms for 1 second (leakage detection current limit, i i-o 5a). this test is performed before the 100% production test fo r partial discharge (method b) shown in iec/en/din en 60747-5-5 insulation characteristic table. b. the input-output momentary withstand voltage is a dielectric voltage rating that should not be interpreted as an input-outpu t continuous voltage rating. for the continuous voltage rating, refer to the iec/en/din en 60747-5-5 insulation characteristics table and y our equipment level safety specification. resistance (input-output) r i-o > 10 12 ?v i-o = 500 v dc c c. this is a two-terminal measur ement: pins 1 to 4 are shorted t ogether and pins 5 to 8 are shorted together. capacitance (input-output) c i-o 0.5 pf f = 1 mhz c table 7: electrical specifications (continued) parameter symbol min. typ. a max. unit test conditions/notes figure note
broadcom av02-3563en 8 acpl-c87b, acpl-c87a, ACPL-C870 data sheet precision optically isolated voltage sensor typical performance plots all 3 (sigma symbol) p lots are based on ch aracterization test result at the point of produc t release. for guaranteed specification, refer to the resp ective electrical specification s section. figure 3: input offset vs. supply vdd1 figure 4: input offset vs. supply vdd2 -5 -4 -3 -2 -1 0 1 2 3 4 5 4.5 5 5.5 offset (mv) vdd1(v) -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 3 3.5 4 4.5 5 5.5 offset (mv) vdd2 (v) figure 5: input offset vs. temperature figure 6: gain vs. supp ly vdd1 offset (mv) temp ( q c) -10 -8 -6 -4 -2 0 2 4 6 8 10 -55 -35 -15 5 25 45 65 85 105 125 m+3 mean m- 3 0.997 0.998 0.999 1.000 1.001 1.002 1.003 4.5 5 5.5 gain (v/v) vdd1 (v) )lxuhdlyv6xsso9 )lxuhdlyv7hpshudwxuh 0.997 0.998 0.999 1.000 1.001 1.002 1.003 3 3.5 4 4.5 5 5.5 gain (v/v) vdd2 (v) 0.99700 0.99800 0.99900 1.00000 1.00100 1.00200 1.00300 -55 -35 -15 5 25 45 65 85 105 125 gain (v/v) temp ( q c)
broadcom av02-3563en 9 acpl-c87b, acpl-c87a, ACPL-C870 data sheet precision optically isolated voltage sensor figure 9: non-linearity vs. supply vdd1 figure 10: non-lineari ty vs. supply vdd2 0 0.02 0.04 0.06 0.08 0.1 4.5 5 5.5 nl (%) vdd1 (v) 0 0.02 0.04 0.06 0.08 0.1 3 3.5 4 4.5 5 5.5 nl (%) vdd2 (v) figure 11: non-linearity vs. temperature figure 12: ac noise v s. filter freq vs. vin 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 -55 -35 -15 5 25 45 65 85 105 125 nl (%) temp ( q c) vin = 0 v vin = 1 v vin = 2 v -1 1 3 5 7 9 11 13 15 17 0 20 40 60 80 100 120 140 160 ac noise (mv rms ) freq filter (khz) )lxuh9 ,1 yv9 287 9 287 )lxuh)uhtxhf5hvsrvh v out+ v outC 0 0.5 1 1.5 2 2.5 3 v out+ , v outC 0 0.5 1 1.5 2 2.5 3 v in -6 -5 -4 -3 -2 -1 0 1 1000 10000 100000 gain (db) bandwidth (hz)
broadcom av02-3563en 10 acpl-c87b, acpl-c87a, ACPL-C870 data sheet precision optically isolated voltage sensor figure 15: phase response figure 16: propagation delay vs temp erature 0 20 40 60 80 100 120 140 160 180 200 1000 10000 100000 phase (deg) bandwidth (hz) tplh 50-10 tplh 50-50 tplh 50-90 0 1 2 3 4 5 6 -55 -35 -15 5 25 45 65 85 105 125 prog delay ( p s) temp ( q c) figure 17: shutdown and wakeup input to output timing diagram. v out diff = v out+ - v out- vin v sd v out diff +2 v -2.46 v 0 v 0 v 2 v 0 v 5v t sd t on )lxuh,sxwwr2xwsxw3urs ddwlrhod7lplldudp9 2xwlii 9 2xw 9 2xw v in v out diff 0 v 2 v 0 v 2 v t plh50-10 t plh50-50 t plh50-90
acpl-c87b, acpl-c87a, ACPL-C870 data sheet precision optically isolated voltage sensor broadcom av02-3563en 11 definitions gain gain is defined as the slope of the best-fit line of differenti al output voltage (v out+ C v out -) over the nominal input range, with offset error adjusted out. nonlinearity nonlinearity is defined as hal f of the peak-t o-peak output deviation from the best-fi t gain line, expressed as a percentage of the fu ll-scale differential output voltage. common mode transient immunity, cmti, also known as common mode rejection cmti is tested by app lying an exponenti ally rising/falling voltage step on pin 4 (gnd1) with respect to pin 5 (gnd2). the rise time of the test wavef orm is set to approximately 50 ns. the amplitude of the step is adjusted until the differential output (v out+ C v out- ) exhibits more than a 200 mv deviation from the average output voltage for more than 1 s. the acpl-c87x will contin ue to function if more than 10 kv/s common mode slopes are applied, as long as the breakdown voltage limitations are observed. power supply rejection, psr psrr is the ratio of differential amplitude of the ripple outputs over power s upply ripple voltage , referred to the input, expressed in db. application information application circuit the typical applicatio n circuit is shown in figure 19 . the acpl-c87x voltage sensor is often used in photo-voltaic (pv) panel voltage measurement and tracking in pv inverters, and dc bus voltage m onitoring in motor drivers. the high voltage across rails needs to be scaled down to fit the input range of the iso- amp by choosing r1 and r2 values according to appropriate ratio. the acpl-c87x senses the sin gle-ended input signal and produces differential outputs across the galvanic isolation barrier. the differential outputs (v out+ , v out- ) can be connected to an op-amp to convert to a single-ended signal or directly to two adcs. the op-amp used in the external post-amplifier circuit should be of sufficiently high precision so that it does not contribute a significant amount of offset or offset drift relative to the c ontribution from the isolation amplifier. generally, op-amps with bipolar input stages exhibit better offset performance than op-amps with jfet or mosfet input stages. in addition, the op-amp should also have enough bandwidth and slew rate so that it do es not adversely affect the response speed of the overall circuit. the post-amplifier circuit includes a pair of capac itors (c4 and c5) that form a single-pole low-pass filter; t hese capacitors allow the bandwidth of the post-amp to be adjusted independently of the gain and are use ful for reducing the output noise from the isolation amplifier. the gain-setting resistors in the post-amp should have a tolerance of 1% or better to ensure adequate cmrr and adequate gain tolerance for th e overall circuit. resistor networks can be used that have much better ratio tolerances than can be achieved using discrete resistors. a resistor network also reduces the total number of components for the circuit as well as the required board space.
acpl-c87b, acpl-c87a, ACPL-C870 data sheet precision optically isolated voltage sensor broadcom av02-3563en 12 figure 19: typical application circuit measurement accuracy and power dissipation of the resistive div ider the input stage of the typical application circuit in figure 19 can be simplified as the diagram shown in figure 20 . r2 and r in , input resistan ce of the acpl-c8 7x, create a current divider that results in an additional measurement error component that will add on to the tot o n top of the device gain error. with the assumption that r1 and rin have a much higher value than r2, the resulting error can be estimated to be r2/r in . with r in of 1 g? for th e acpl-c87x, this additional measurement error is negligible with r2 up to 1 m?, where the error is appro ximately 0.1%. though small, it can be further reduced by reducing the r2 to 100 k? (error of 0.01% approximately), or 10 k? (error of 0.001% approximately). however wit h lower r2, a drawback of higher power dissipation in the resistive divider string needs to be considered, especially in higher voltage sensing applications. for example, wit h 600 v dc across l1 and l2 and r2 of 100 k? for 0.01% measurement error, the resistive divider string con sumes about 12 mw, assuming v in is set at 2v. if the r2 is redu ced to 10 k? to reduce error to 0.001%, the power consu mption will increa se to about 120 mw. in energy-efficiency cr itical applications, such as pv inverters and battery-powered applications, this trade-off between measurement accuracy and power dissipation in the resistive st ring provides flexibility in des ign priority. figure 20: simplified input stage v dd1 1 v in 2 shdn 3 gnd1 4 gnd2 5 v out- 6 v out+ 7 v dd2 8 u1 acpl-c87x gnd2 r4 10k,1% gnd2 v dd2 v dd1 vout gnd1 l1 l2 r2 10k c1 100 pf c2 100 nf c3 100 nf r3 10k,1% r1 u2 opa237 v+ v- c4 100 pf r5 10k, 1% c5 100 pf r6 10k, 1% + C + gnd acpl-c87x r1 r2 r in
acpl-c87b, acpl-c87a, ACPL-C870 data sheet precision optically isolated voltage sensor broadcom av02-3563en 13 isolated temperature sensing using a thermistor igbts are an integral part of a motor or servo drive system and because of the high power that they usually handle, it is essential that they have proper thermal management and are sufficiently cooled. long te rm overload conditions could raise the igbt module temperature permanently or failure of the thermal management system could subject the module to package overstress and lead to catastrophic failures. one common way to monitor the temperature of the module is through using a ntc type thermistor mounted onto the igbt module. some igbt module manufacturers also have igbts that comes wit h the thermistor integrated inside the module. in some cases, it is necessary to isolate this thermistor to provide added isolation and insulation due to the high power nature of the igbts. the acpl-c87x voltage sensor can be us ed to easily meet such a requirement, while providing good accuracy and non- linearity. figure 21 shows an exampl e of such an implementation. the acpl-c 87x is used to isolate the thermistor voltage which is la ter fed by the post amp stage to an adc onboard the microcontroller (mcu) to determine the module temperature. the thermistor needs to be biased in way that its voltage output will optimize the 2v input range of the acpl-c87x across the intended temperature measurement range. figure 21: thermistor sensing in igbt module hv+ hv- igbt module ntc thermistor u v w + C + gnd acpl-c87x vdd mcu adc post amp
acpl-c87b, acpl-c87a, ACPL-C870 data sheet precision optically isolated voltage sensor broadcom av02-3563en 14 power supplies and bypassing a power supply of 5v is required to power the acpl-c87x input side vdd1. in many mo tor drive dc bus voltage sensing applications, this 5 v supply is most often obtained from the same supply used to power the power transistor gate drive circuit using an inexpensive 78l05 three-terminal regulator. to help attenuate high frequency power supply noise or ripple, a resistor or i nductor can be used in series with the input of the regulator to form a low-pa ss filter with the regulators input bypass capacitor. in some other applications, a dedicated supply might be required to supply the vdd1. these applications include photovoltaic (pv) invert er voltage tracking and measurement, temperature sensor signal isolation. in these cases it is possible to add a n additional winding on an existing transformer. otherw ise, some sort of simple isolated supply can be used , such as a line powered transformer or a high-frequency dc-dc converter module. as shown in figure 22 , 100-nf bypass capacitors (c2, c3) should be located as close as possible to the pins of the isolation amplifier. the by pass capacitors are required because of the high-speed dig ital nature of the signals inside the isolation amplifier. a 100-pf bypass capacitor (cin) is also recommended at the input pins due to the switched-capacitor nature of t he input circuit. the input bypass capacitor cin also form s part of the anti-aliasing filter, which is recommended to prevent high-frequency noise from aliasing down to lower frequencies and interfering with the input signal. when r1 is far greater than r2, the low-pass anti-aliasing filter corner frequency can be calculated by 1/(2r2cin). the input filter also performs an important relia bility functionit re duces transient spikes from esd events flo wing through the high voltage rails. figure 22: recommended power supply and bypassing v dd1 shdn gate drive circuit 78l05 acpl-c87a cin 0.1nf c1 0.1 p f c2 0.1 p f gnd1 v in in out floating positive supply v out+ 5v v dd2 v out- gnd2 c3 0.1 p f r1 r2 hv+ hv-
acpl-c87b, acpl-c87a, ACPL-C870 data sheet precision optically isolated voltage sensor broadcom av02-3563en 15 pc board layout the design of the printed circ uit board (pcb) should follow good layout practices, such as keeping bypass capacitors close to the supply pins, keepi ng output signals away from input signals, the use of groun d and power planes, and so on. in addition, the layout of the pcb can also affect the isolation transient immunity (cmti) of the acpl-c87x, primarily due to stray capacitive coupling between the input and the output circuits. to obtain optimal cmti perfor mance, the layout of the pc board should minimize any st ray coupling by maintaining the maximum possible dist ance between the input and output sides of the circuit a nd ensuring that any ground or power plane on the pc board does not pass directly below or extend much wider than the body of the acpl-c87a. the placement of the input capacitor which forms part of the anti- aliasing filter together with the resistor network should also be placed as close as possible to the vin pin.
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