5B42 Analog Devices Inc
Contents
1. 40 C to 85 C through design for low parameter drift This enables the module to provide output offset drift of only 5 uV C and gain drift of just 25 ppm C Why an Internal Current Sense Resistor The 5B42 offers significant advantages over signal conditioners that require an external current sense resistor First an external resistor is not protected from accidental connection to a 240 V rms power line Next the external resistor tolerance must be added to the Vx 1 wr ny Ww MALY VATED JWRE TRANSMITTER PUT Figure 2 conditioners specified errors In contrast the 5B42 is calibrated and specified with its internal 25Q sense resistor Further the 5B42 signal input loop supply and the sense resistor are all protected against accidental application of excess voltages up to 240V rms Finally there is no need to install an external sense resistor on the backplane but if one is installed it will not affect 5B42 performance Filtering and Protection The 5B42 contains an optimized five pole low pass filter with a 3 dB bandwidth at 100Hz that provides a low overshoot step response and exceptionally low noise of 200 uV pk pk in a 100kHz bandwidth Attenuation normal mode rejection increases at a 90 dB decade rate beyond 100 Hz The module protects the computer side from damage due to field side over voltage faults The module withstands 240 V rms at the input terminals without damage thereby shielding the int2. ms Common Mode Voltage CMV Output to Input Continuous 1500 V rms maximum Input to Power Continuous 1500 V rms maximum Output to Power Continuous 250 V rms maximum Transient ANSI IEEE C37 90 1 1989 Common Mode Rejection CMR 1 k Q Source Imbalance 50 60 Hz 140 dB Normal Mode Rejection NMR 3 dB 100 Hz 90 dB per decade gt 100 Hz Input Excitation and Sense Resistor Protection Continuous 240 V rms maximum Transient ANSI IEEE C37 90 1 1989 Rev 0 Page 3 of 8 Output Resistance Voltage Output Protection Output Current Limit Output Selection Time Max Logic 0 Min Logic 1 Max Logic 1 Input Current 0 1 Power Supply Voltage Transmitter Load of 20 mA Transmitter Load of 4 mA Power Supply Sensitivity RTI Mechanical Dimensions Rated Performance Operating Storage Relative Humidity RFI Susceptibility 252 Continuous Short to Ground 20 mA 6 us to 1 mV of Vout Cioag O to 2 000 pF Output Enable Control 0 8 V 2 44 V 36 V 0 5 pA 5 V dc 5 Power Supply Current 200 mA 100 mA 1 UV of Vs 2 275 x 2 375 x 0 595 57 8 mm x 59 1 mm x 15 1 mm Environmental Temperature Range 40 C to 85 C 40 C to 85 C 40 C to 85 C 0 to 95 60 C non condensing 0 5 Span error 400 MHz 5 Watt 3 ft Includes the combined effects of repeatability hysteresis and nonlinearity error Loads heavier than 50 k Q will degrade nonlinearity and gain
3. ANALOG DEVICES FEATURES Isolated Current Input Interfaces with two wire transmitters providing an isolated regulated 20 V supply voltage Measure process current input signal of 4 20 mA Generates an output of 1 to 5V or 2 to 10V Module circuitry can withstand 240v rms at the input screw terminals All 5B42 series modules are mix and match and Hot Swappable APPLICATIONS Industrial signal conditioning Industrial signal isolation Industrial signal filtering PRODUCT OVERVIEW The 5B Series represents an innovative generation of low cost high performance plug in signal conditioners Designed for industrial applications these modules incorporate highly reliable transformer based isolation and automated surface mount manufacturing technology They are compact economical components whose performance exceeds that available from more expensive devices Combining 1500 V rms continuous isolation 0 05 calibrated accuracy small size and low cost the 5B Series is an attractive alternative to expensive signal conditioners and in house designs All modules are potted and identical in pin out and size 2 27 x 2 32 x 0 595 They can be mixed and matched permitting users to address their exact needs and may be hot swapped without disturbing field wiring or power The isolated input modules provide 0 to 5V or 5V outputs and accept J K T E R S N or B type thermocouples These modules feature complete
4. backplane incorporates screw terminals for field wiring inputs and outputs and cold junction sensors for thermocouple applications These signal conditioners are designed to provide an easy and convenient solution to signal conditioning problems of both designers and end users in measurement and control applications Typical uses include microcomputer based measurement systems standard data acquisition systems programmable controllers analog recorders and dedicated control systems The 5 B series modules are ideally suited to applications where monitoring and control of temperature pressure flow rotation and other analog signals are required The 5B Series modules and backplanes are approved by Factory Mutual FM and the 5B Series modules are approved by the Canadian Standards Association CSA for use in Class 1 Division 2 Groups A B C and D locations These approvals certify that the 5B Series is suitable for use in locations where a hazardous concentration of flammable gas may exist only under fault conditions of operation Equipment of this category is called nonincendive and they need no special enclosures or other physical safeguards The 5B series modules and backplanes have been tested and passed the stringent heavy industrial requirements of the European Union s electromagnetic compatibility ENC directive EN50082 1 and EN50081 2 When used according to installation directions refer to 5B series User Manual any
5. ernal computer side circuitry from field side over voltage conditions In addition the 5B42 is mix and match and hot swappable with all other 5B Series modules so can be inserted or removed from any socket in the same backplane without disrupting system power A series output switch eliminates the need for external multiplexing in many applications The switch is turned on by an active low enable input If the switch is to be on at all times the enable input should be grounded to power common as it is on the 5B01 and 5B08 backplanes Rev 0 Page 2 of 8 5B42 Models Available Model Input Range Output Range 5B42 01 4 mA to 20 mA 1Vto 5V 5B42 02 4 mA to 20 mA 2 V to 10 V 5B42 Custom 4 E Custom Input Output ranges are available 5B42 Specifications typical 25 C and V 5 V dc Description Model 5B42 Input Ranges Standard Ranges 4 mA to 20 mA Refer to Model Table Custom Ranges 0 mA to 20 mA Refer to Ordering Section Isolated Loop Supply Voltage 20 V 4 mA to 20 mA Input Output Ranges R gt 50 k Q 1 V to 5 V 2 V to 10 V Accuracy Initial 25 C 0 05 Span 4 pA RTI Nonlinearity 0 01 Span Input Offset vs Temperature 0 5 uV C Output Offset vs Temperature 5 uV C Gain vs Temperature 0 0025 of Reading C Input Sense Resistor 259 Noise Input 0 1 Hz to 10 Hz Bandwidth 10 nA rms Output 100 kHz Bandwidth 200 pV peak peak Bandwidth 3 dB 100 Hz Output Step Rise Time 10 to 90 Span 4
6. errors caused by EMI RFI interference will be less than 0 1 of the full scale 5B measurement range for field strengths up to 10 V M and frequencies up to 1 GHz 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 2004 Analog Devices Inc All rights reserved GENERAL DESCRIPTION The 5B42 is a single channel signal conditioning module that interfaces with two wire transmitters providing an isolated regulated 20V supply voltage The module filters and amplifies the 4 to 20 mA process current input to produce an accurately scaled low noise low impedance output of 1 to 5 V or 2 to 10 V True Three Port Isolation The floating differential input circuit on the field side eliminates the need for any input grounding Signal and power isolation by transformer coupling uses a proprietary modulation technique for linear stable and reliable performance A demodulator on the computer side of the signal transformer recovers the original signal which is then filtered and buffered to provide a low noise low impedance output signal True three port isolation Input Output Power includes common mode ratings of 1500 V rms between input and output and input and power 250V rms between power and output no return path is required between the power and signal output commons Accurate and Stable Performance The 5B42 maintains accuracy over the wide operating temperature range of
7. evices subjected to high energy electrostatic discharges A Therefore proper ESD precautions are recommended to avoid performance degradation or loss of functionality ESD SENSITIVE DEVICE Rev 0 Page 5 of 8 OUTLINE DIMENSIONS BOTTOM area Figure 5 Outline Dimensions Rev 0 Page 6 of 8 NOTES Rev 0 Page 7 of 8 NOTES 2004 Analog Devices Inc All rights reserved Trademarks and ANALOG registered trademarks are the property of their respective companies www ana l 0 g com msasa Mal DEVICES Rev 0 Page 8 of 8
8. signal conditioning functions including 240 V rms input protection filtering chopper stabilized low drift 1 uV oC amplification 1500 V rms isolation and sensor excitation when required All modules feature excellent common mode rejection and meet industrial transient surge withstand specifications FUNCTIONAL BLOCK DIAGRAM 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 companies Isolated Process Current Input 2 WIRE TRANSMITTER 2 Your vo 3 COMMON i READ t 22 ENABLE ISOLATED OUTPUT I SIDE LOOP POWER SUPPLY I NC isovareo neat 17 8 VOC FIELDSIDE Ww POWER OSCILLATOR o POWER COMMON 24 vDC ll ISOLATED INPUTSECTION ISOLATION OUTPUT SECTION BARRIER NC NO CONNECTION Figure 1 5B42 Functional Block Diagram There are also a number of backplanes and mounting sockets which provide a complete signal conditioning solution for end users Each
9. temperature coefficient 2A precision 25 Q current sense input resistor is internal to the 5B42 refer to block diagram The user s board layout must separate Power Common from Output Common When the output switch is not used connect the Enable Input to the Output Common Output common is connected to power common when the 5B42 is installed on a 5B Series backplane Specifications subject to change without notice Rev 0 Page 4 of 8 PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS IN EXC 2 WIRE TRANSMITTER Figure 3 5B42 Input Field Connections Table 1 Pin Function Descriptions Pin No Description 3 IN 0 150 3 8 0 385 9 8 0 525 12 9 2 275 1 SENSOR 2 SENSOR 3 EXCITATION 4 EXCITATJON 5 INPUTLO 6 INPUT HI O 0 275 6 7 78 16 POWER COM 4 EXC MAX 17 5voc 0 475 11 6 18 Vy 5839 ONLY 19 vo com PT 5B39 0 375 9 5 20 Vour EXCEPT 5839 21 RESERVED SOCKET 22 READ ENABLE 0 0 038 PIN ja 0595 23 WRITE ENABLE 0 15 1 MAX TOP VIEW BOTTOM VIEW Figure 4 Model 5B Series Module with pin out assignments ESD CAUTION ESD electrostatic discharge sensitive device Electrostatic charges as high as 4000 V readily accumulate on the human f f i 3 WARNING body and test equipment and can discharge without detection Although this product features proprietary ESD protection circuitry permanent damage may occur on d
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