Programmable, Isolated Voltage-to-Current Converter 1B22 OFFSET N

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Programmable, Isolated Voltage-to-Current Converter 1B22 OFFSET N

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FEATURES Internal Isolated Loop Supply Drives 1000 Load Programmable Inputs: Programmable Outputs: High Isolation: 1500 Normal-Mode Output Protection: High Accuracy Offset Tempco: Gain Tempco: ppm/ Nonlinearity: 0.02% High CMR: Small Package: 1.0" 2.10" 0.35" Meets IEEE 472: Transient Protection (SWC) APPLICATIONS Multichannel Process Control Converter-Current Loop Interface Analog Transmitters Controllers Remote Data Acquisition Systems GENERAL DESCRIPTION
Programmable, Isolated Voltage-to-Current Converter 1B22
OFFSET NODE
RESISTOR NETWORK
1B22
SIGNAL ISOLATION DEMODULATOR
PROT
MODULATOR
SYNC +15V -15V
POWER ISOLATION OSCILLATOR RECTIFIER/ LOOP SUPPLY
VLOOP
DESIGN FEATURES USER BENEFITS
1B22 isolated voltage-to-current converter that incorporates transformer isolation achieve high performance automated surface mount manufacturing cost increased reliability. Designed industrial applications, especially suited harsh environments with extremely high common-mode interference. With programmable inputs outputs, 1B22 provides unbeatable combination versatility performance compact plastic package. Functionally, converter consists four basic sections: input conditioning, modulator/demodulator, isolated loop supply current source (Figure 1B22 programmable inputs outputs using internal resistor network. also external resistor accept inputs. Transformer coupling provides 1500 galvanic isolation between inputs current loop. Nonlinearity excellent 0.05% max. Loop power generated internally through dc/dc converter also isolated from input side (1500 rms). Loop compliance voltage dependent voltage supplied 1B22, with VLOOP sufficient drive 1000 load. 1B22 fully specified over -25°C +85°C operates over industrial (-40°C +85°C) temperature range.
Isolated Loop Power: Internal loop supply completely isolates loop from input terminals (1500 rms) provides capability drive 1000 loads. This eliminates need external dc/dc converter. Ease Use: 1B22 offers complete isolated voltage-tocurrent conversion with minimum external parts required conditioned current signal. external buffers drivers required. High Isolation: 1B22 features high input output galvanic isolation eliminate ground loops offer protection against damage from transients fault voltages. isolation barrier will withstand continuous 1500 meets IEEE Standard Common-Mode Voltage Transient Protection (STD 472-SWC). Small Size: 1B22 package size (1.0" 2.1" DIP) makes excellent choice multichannel systems maximum channel density. 0.35" height also facilitates applications with limited board clearance.
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices. Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Site: http://www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 2000
1B22-SPECIFICATIONS (typical
VLOOP unless otherwise noted)
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
Model INPUT SPECIFICATIONS Factory Calibrated, User Selectable Input Impedance Input Range Input Range OUTPUT SPECIFICATIONS Current Output Range, User Selectable Load Compliance Range, VLOOP Load Compliance Range, VLOOP Maximum Output Current Input Overload Output Noise, Bandwidth NONLINEARITY Span) ISOLATION CMV, Input Output Continuous CMR, Normal-Mode Output Protection Transient Protection ACCURACY Warm-Up Time Rated Performance Total Output Error +25°C Offset (VIN Span (VIN Temperature (-25°C +85°C) Offset Span DYNAMIC RESPONSE Settling Time 0.1% Step Small Signal Bandwidth POWER SUPPLY Bipolar Input Supplies Operating Voltage Quiescent Current Power Supply Rejection Loop Supply Operating Voltage Operating Current, Full-Scale Output Loop Supply Rejection ENVIRONMENTAL Temperature Range Rated Performance Operating Storage Relative Humidity, Noncondensing CASE SIZE
Specifications subject change without notice.
1B22AN 0.02% 0.05% max) 1500 Continuous IEEE-STD (SWC) 0.7% Full Scale nA/°C ppm/°C
AC1225 MATING SOCKET
0.01%/V 0.005%/V -25°C +85°C -40°C +85°C -40°C +85°C 60°C 1.0" 2.1" 0.35"
DESIGNATIONS
Function NODE OFFSET SYNC VLOOP POWER
REV.
1B22
INSIDE 1B22
1B22 produces isolated output current which proportional input voltage independent output load resistance (Figure input stage configured inverting amplifier with resistor network provide pin-strappable input ranges output ranges conditioned signal modulated generate square wave that drives transformer peak-to-peak amplitude signal proportional VIN. internal, high stability reference with nominal output voltage +6.4 used develop offset current loop output.
Figure Basic Interconnections
Figure 1B22 Functional Block Diagram
After passing through signal transformer amplitude modulated signal demodulated filtered single pole filter. This filtered output control signal voltageto-current converter stage. Timing information demodulator derived from power transformer 1B22 outputs protected from accidental shorts line voltages rms. Combined with 1500 input output isolation, 1B22 provides unbeatable protection against transients, wiring errors current loop short circuits power lines. dc-dc converter consists power driver, power transformer full wave rectifier filter. dc-dc converter provides power output circuitry well isolated compliance voltage loop. This voltage proportional VLOOP input side. 1B22 requires supplies power input side circuitry supply dc-dc converter.
USING 1B22
Figure Internal Resistor Network
Optional Trim Adjustments: Figure example using potentiometers trimming gain offset input output. network offset adjustment keeps resistors relatively small minimize noise effects while giving sensitivity span. value should range (for configurations, resistor should used). more adjustment range, resistors smaller than used.
1B22
RESISTOR NETWORK PROT
NODE
+15V 274k -15V
SYNC +15V -15V
Basic Interconnections: 1B22 applied achieve rated performance shown Figure signals either used input; signals jumper IN2. Similarly, operation OFFSET node should jumpered NODE, while should tied COM. Figure shows functional diagram resistor network used 1B22. applications where separate loop supply available, supplies used connecting VLOOP (Pin P.COM (Pin 25). additional compliance voltage, P.COM connected drive higher loads.
POWER DRIVER
RECTIFIER/ LOOP SUPPLY
VLOOP
Figure Optional Offset Span Adjustment
REV.
1B22
Synchronizing Multiple 1B22s: applications where multiple 1B22s used close proximity, radiated individual oscillator frequencies cause "beat frequency" related output errors. These errors eliminated driving SYNC pins units with clock circuit duty cycle (Figure SYNC input typically input impedance
APPLICATIONS
Figure Multiple 1B22s' Synchronization
Figure Converter-Isolated 4-20 Interface
Loop Supply Requirements: 1B22 design allows flexible loop supply options. loop supply voltage required value load resistance calculated from following equation: VLOOP
This value allows approximately overrange capability. graph Figure shows relationship between supply voltage load resistance.
Pressure Transmitter: Figure 1B22 used pressure transmitter application provide complete inputoutput isolation avoid signal errors ground loop currents. process pressure monitored with strain gage type pressure transducer interfaced Analog Devices' 1B32 transducer signal conditioner. high level voltage output 1B32 converted isolated current transmission remote recorder indicator.
Figure Isolated Pressure Transmitter
Figure Loop Supply Load
DACPORT registered trademark Analog Devices, Inc.
REV.
PRINTED U.S.A.
C1193a-2.2-3/00 (rev.
Isolated Converter: 1B22 offers total ground isolation protection from high voltage transients interfacing converters standard current loops. converter, such Analog Devices' 12-bit AD7245 DACPORT®, should connected operation unipolar output range. This shown Figure

Programmable, Isolated Voltage-to-Current Converter 1B22 OFFSET N

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