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 which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of analog devices. a model 5b36 one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781/329-4700 world wide web site: http://www.analog.com fax: 781/326-8703 ? analog devices, inc., 1997 potentiometer input module functional block diagram general description model 5b36 converts the input from a variety of potentiometers and variable resistors to a high level output of 0 v to +5 v. the module provides transformer isolation, potentiometer excitation, signal filtering and input protection against line voltage connec- tion. the series output switch eliminates the need for external multiplexing. the industry standard 5b series encapsulated plug-in modular package is compatible with all 5b backplanes. modules are powered by +5 v dc, 5%. signal isolation is provided by transformer coupling using a proprietary technique for linear, stable performance. a demodu- lator on the output side of the signal transformer recovers the input signal, which is filtered and buffered to provide an accu- rate, low impedance, low noise output. true three-port isolation includes common-mode voltage of: 1500 v rms between input and output, and between input and power; 250 v rms between output and power. the modules provide potentiometer excitation from a precision current source. a low drift, chopper stabilized, differential amplifier design allows for the use of very low excitation currents to minimize accuracy losses from self-heating of the potentiom- eter. the low gain drift of 30 ppm/ c and low offset drift assure that accuracy is maintained over a wide operating tem- perature range. the 5b36 supplies equal excitation currents to three-wire potentiometers to cancel the effects of lead resistance. an optimized five-pole butterworth filter (with 4 hz bandwidth) provides 116 db of normal-mode rejection at 60 hz and 108 db features accepts potentiometers up to 10,000 v high level 0 v to +5 v output 1500 v rms input/output and input/power isolation 250 v rms output/power isolation 240 v rms field wiring protection 170 db cmrr 116 db nmr @ 60 hz, 108 db @ 50 hz low gain drift: 6 30 ppm/ 8 c low output noise: 0.3 mv p-p @ 100 khz bw 6 mv p-p @ 5 mhz bw low power consumption: +5 v dc @ 15 ma ansi/ieee c37.90.1C1989 transient protection csa, fm and ce approvals at 50 hz. output noise is an exceptionally low 0.3 mv p-p at 100 khz bandwidth and 6 mv p-p at 5 mhz bandwidth. the input circuit is protected against accidental application of voltages, such as an ac power line, up to 240 v rms continuous. a series output switch is included to eliminate the need for external multiplexing in many applications. this switch has a low output resistance and is controlled by an active-low enable input. when the output switch is not used, ground the enable input to i/o common to turn on the switch. 4 3 2 1 signal isolation chopper dif amp 4-pole active lpf p.s. power isolation rect. and filter power osc. v out i/o com read en (0) 1 5v pwr com nc prot nc 5b backplane 5b36 C 1 prot. & filter nc 1 C nc = no connect
C2C rev. 0 model 5b36Cspecifications c3195C2C10/97 printed in u.s.a. model 5b36 input standard ranges see table i custom range limits see table ii impedance normal (power on) >1000 m w power off 200 k w overload 200 k w normal mode rejection (nmr) 116 db (60 hz); 108 db (50 hz) protection continuous 240 v rms max transient ansi/ieee c37.90.1C1989 sensor excitation current 100 w , 500 w , 1 k w sensors 0.25 ma 10 k w sensor 0.1 ma lead resistance effect 100 w , 500 w , 1 k w sensors 0.005 w / w 10 k w sensor 0.01 w / w common-mode voltage (cmv) input-to-output, continuous 1500 v rms, max input-to-power, continuous 1500 v rms, max power-to-output, continuous 1 250 v rms, max common-mode rejection (cmr) 50 hz/60 hz 170 db accuracy initial @ +25 c 2 0.08% span stability vs. temperature (C40 c to +85 c) input offset 100 w , 500 w , 1 k w sensors 0.004 w / c 10 k w sensor 0.010 w / c output offset 20 m v/ c gain 30 ppm of reading/ c output range 0 v to +5 v resistance 25 w bandwidth, C3 db 4 hz step response time (10% to 90% range) 100 ms noise input, 0.1 hz to 10 hz 0.2 m v rms rti 3 output, 100 khz bandwidth 100 m v rms 0.3 mv p-p output, 1 mhz bandwidth 1.5 mv p-p output, 5 mhz bandwidth 6 mv p-p protection continuous short to ground current limit 9 ma enable time (c load = 0 pf to 2000 pf) 6 m s to 1 mv of v out enable control max logic 0 +0.8 v min logic 1 +2.4 v max logic 1 +100 v input current 0, 1 0.5 m a power supply voltage, rated performance +5 v dc 5% current 15 ma sensitivity 2 m v/% rti 3 case size, maximum 2.275" 2.325" 0.595" (57.8 mm 59.1 mm 15.1 mm) weight 70 grams environmental temperature range, rated performance C40 c to +85 c storage temperature C40 c to +85 c relative humidity 0% to 93% @ +40 c, noncondensing rfi susceptibility 0.5% span error @ 400 mhz, 5 w, 3' notes 1 the users board layout must separate power ground from i/o common and when the 5b36 output switch is not used, ground the enable input to i/o common. power-to-output cmv is not available when the 5b36 is installed on a 5b series backplane. 2 includes the combined effects of repeatability, hysteresis and nonlinearity. 3 referenced to input. specifications subject to change without notice. (typical @ +25 8 c and v s = +5 v dc) table i. standard model input/output ranges* model input range output range 5b36-01 0 w to 100 w 0 v to +5 v 5b36-02 0 w to 500 w 0 v to +5 v 5b36-03 0 w to 1 k w 0 v to +5 v 5b36-04 0 w to 10 k w 0 v to +5 v note *custom input/output ranges are available. see table ii. table ii. custom model ordering guide order model: 5b36-custom plus customer specified information input rang e zero suppression (= low); specify minimum 0 w maximum 150 w high; specify minimum 25 w + zero suppression maximum 10 k w + zero suppression output range low; fixed 0 v high; specify +5 v max examples: smallest input range with no zero suppression specify 0 w to 25 w input range smallest input range with highest zero suppression specify 150 w to 175 w input range largest input range with no zero suppression specify 0 w to 10 k w input range largest input range with highest zero suppression specify 150 w to 10.150 k w input range
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