Wide Supply Voltage Range: 6.35V Wide Operating Temperature Range: -40

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Wide Supply Voltage Range: 6.35V Wide Operating Temperature Range: -40

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VOLTAGE/CURRENT CONVERTER
Wide Supply Voltage Range: 6.35V Wide Operating Temperature Range: -40°C.+85°C Adjustable Voltage Reference: Operational Amplifier Input: 0.5.4.5V, 0.5V, other Adjustable Offset Current Available Three- (0/4.20mA) Two-Wire Version (4.20mA) Adjustable Output Current Range Protection Against Reverse Polarity Protected Current Output
AM422
GENERAL DESCRIPTION
AM422 cost monolithic voltage- to-current converter specially designed analog signal transmission. AM422 available 2-wire version, which allows applications with flexible input voltage ranges used standard output current. Output current range current offset level freely adjustable external resistors. consists three basic sections: operational amplifier input stage single ended input signals (0.5-4.5V, 0-10V, other), programmable reference transducer excitation, current output, freely adjustable wide current range (4-20mA, 0-20mA, other). With broad spectrum possible input signals AM422 flexible multipurpose voltage-to-current converter single ended transducers voltage transmission.
APPLICATIONS
Sensor Interface Industrial Process Control Programmable Current Source Current Source Reference
DELIVERY
DIL8 packages (samples) SOP8 packages Dice blue foil
BLOCK DIAGRAM
VSET VREF Reference Voltage VREF
AM422
Input Amplifier
Figure
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: www.analogmicro.de Phone: (0)6131/91 Fax: (0)6131/91 E-Mail: info@analogmicro.de
April 1/10 Rev.
VOLTAGE/CURRENT CONVERTER
ELECTRICAL SPECIFICATIONS
Tamb 25°C, 24V, VREF IREF (unless otherwise noted)
Parameter Voltage Range Quiescent Current Temperature Specifications Operating Storage Junction Thermal Resistance Tamb Voltage Reference Voltage VREF VREF Trim Range Current VREF Temperature Line Regulation VR10 IREF* dVREF/dT dVREF/dV dVREF/dV Load Regulation dVREF/dI dVREF/dI Load Capacitance Stage Internal Gain Input Voltage Offset Voltage Temperature Input Bias Current Temperature Input Stage Internal Gain Input Voltage Offset Voltage Temperature Input Bias Current Temperature dVOS/dT dIB/dT ±0.5 ±1.6 VSET dVOS/dT dIB/dT ISET 4mA, IREF Tamb 40.+85°C 6V.35V 6V.35V, IREF VSET connected VSET GND, 4.75 0.05 0.06 5.00 10.0 DIL8 plastic package plastic package Symbol Tamb 40.+85°C, IREF Conditions Min. Typ.
AM422
Max.
Unit
°C/W °C/W
5.25 10.5 VR10 ±140 0.10 0.15
ppm/°C ppm/V ppm/V %/mA %/mA
µV/°C pA/°C
1.15 ±2.5
µV/°C pA/°C
analog microelectronics
April 2/10
VOLTAGE/CURRENT CONVERTER
Parameter Converter Internal Gain Trim Range Voltage Range Offset Voltage Temperature Output Offset Current IOUTOS Temperature Output Offset Current IOUTOS Temperature Output Control Current IOUTC Temperature Output Voltage Range VR0FS dVOS/dT IOUTOS dIOUTOS/dT IOUTOS dIOUTOS/dT IOUTC dIOUTC/dT VOUT VOUT Output Current Range Output Resistance Load Capacitance Protection Functions Voltage Limitation Temperature Limitation Protection against reverse polarity Current case reverse polarity System Parameters Nonlinearity ideal input 0.05 VLIMR0 VLIMR0 TLIMIT Ground IOUT Ground 35V, IOUT VIN/2, VREF/2 VSET/2 VREF/2 IOUTFS ROUT adjustable 0.75 1.00 1.00 Symbol Conditions Min. Typ.
AM422
Max. Unit
1.25 µV/°C nA/°C nA/°C nA/°C
3-wire operation 3-wire operation 2-wire operation 2-wire operation 2-wire operation, VR0/100mV 2-wire operation VOUT IOUT, VOUT IOUT, IOUT VR0/R0, 3-wire operation
0.15
2-wire operation maximum current IOUTmin valid Currents flowing into negative
BOUNDARY CONDITIONS
Parameter Sense Resistor Symbol Stabilisation Resistor Load Resistance Offset Resistors VREF Capacitance Output Capacitance Breakdown Voltage Forward Current Gain only 2-wire operation Conditions IOUTFS 20mA 20mA/IOUTFS IOUTFS 20mA 20mA/IOUTFS limitation only 3-wire operation Min. Typ. Max. Unit
analog microelectronics
April 3/10
VOLTAGE/CURRENT CONVERTER
FUNCTIONAL DIAGRAMS
Voltage Reference
AM422
3-Wire System
Input Amplifier
IOUT
Ground
Figure
Voltage Reference
2-Wire System
Input Amplifier
IOUT
Ground
Figure
FUNCTIONAL DESCRIPTION
AM422 integrated voltage-to-current converter broad spectrum possible single ended input signals. With variations external components output current adjusted over wide range. addition resistors capacitor (C2), circuitry needs only output transistor diode external transistor decreases power dissipation diode protecting transistor against reverse polarity. Typical values external components listed Application Notes. principle AM422 used two-wire three-wire voltage-to-current interface. schematic entire system three-wire output demonstrated Figure external reference point Ground identical ground (GND) supply voltage becomes Opposed this, ground two-wire mode (Figure (GND)
analog microelectronics
April 4/10
VOLTAGE/CURRENT CONVERTER
AM422
connected between resistors this case supply voltage depends voltage load resistor calculated: IOUT Basically AM422 composed functional sections they shown Figure operational amplifier input which allows adjustment output current range with external resistors With variation resistors input voltage range output current range set. voltage controlled current output, with wide current range adjustable with external resistors RSET, resistors output offset current, which depends reference voltage corresponds minimal output current. output current IOUT supplied external transistor driven output (OUT). programmable voltage reference (VSET N.C. VSET GND) used excitation constant voltage sensors supply other external devices. output current based partial currents: adjustable offset current current relying input signal VIN. transfer function AM422 then (VSET ,VIN (VSET (VIN
adjustment AM422 cases have differentiated. input voltage ranges without offset voltage (0.5V, 0.10V) adjustment output current range follows: minimum output current with input voltage output offset current becomes (VIN RSET VSET RSET
With simplifications resistor RSET RSET VREF VINmax
output current range with transfer function calculated OUTmax relationship R1/R2 becomes VINmax OUTmax
adjustment using input offset voltage (for example 0.5.4.5V) described follows. desired change output current IOUT
analog microelectronics
April 5/10
VOLTAGE/CURRENT CONVERTER
input voltage change With value relationship resistors additional offset current calculated OUTmin INmin OUTmin VINmin
AM422
(10)
value resistor then found using equation respect load resistor value supply voltage considered with care. following relation generally valid (see equation IOUTmax +VCCmin (11)
resulting operating range indicated Figure Sample calculations typical values external components listed Application Notes (beginning page
VCCmin IOUTmax
VCCmin RLmax IOUTmax 20mA
Operating Area
Figure
analog microelectronics
April 6/10
VOLTAGE/CURRENT CONVERTER
PINOUT
NAME VSET VREF
AM422
DESIGNATION Supply Voltage Sense Resistor Output Voltage Input Voltage Reference Voltage Select Ground Reference Voltage Output
VREF VSET
Figure
DELIVERY
AM422 available (AM422-2) 3-wire version (AM422-1). different versions compatible. AM422 available packages (samples) packages Dice blue foil
PACKAGE DIMENSIONS SOP8
4,98 1,45 0,05 0,42 0,07 1,27 0,635 0°-10°
2,00
Figure
analog microelectronics
April 7/10
VOLTAGE/CURRENT CONVERTER
TYPICAL THREE-WIRE APPLICATION 5/10V)
VREF
AM422
RSET
AM422-1
VSET VREF
VOFFSET
5/10 Reference
Amplifier
IOUT
Ground
Figure Used three-wire circuit (AM422-1) ground (GND) connected Ground (Figure relationship R1/R2, using equation becomes VINmax OUTmax current ISET used output current offset calculated using equation (VIN VREF RSET RSET
With resistor RSET becomes (equation RSET VREF
Example Output current range 4.20mA this case values external devices (VIN 0K5V VREF follows RSET 2.64k R1/R2 5.25 0.500 2.2µF Example Output current range 0.20mA this case values external devices (VIN 0K10V VREF follows RSET R1/R2 0.500 2.2µF
analog microelectronics
April 8/10
VOLTAGE/CURRENT CONVERTER
TYPICAL THREE-WIRE APPLICATION (0.5 4.5V)
RSET
AM422
VREF
AM422-1
VSET VREF
Sensor 0.5-4.5V
VOFFSET
5/10 Reference
Amplifier
IOUT
Ground
Figure Example Output current range IOUT 4.20mA, input voltage range 0.5.4.5V transfer function output current IOUT (equation 4.5V application (Figure change input voltage from should displayed over change output current IOUT 16mA. With voltage change (VPIN4 800mV, equation relationship R1/R2, using equation becomes then 800mV With that relation offset current ISET from OUTmin INmin OUTmin adjusted (equation 10). With resistor RSET calculated (equation RSET VREF RSET 1.32k
values external devices than calculated follows (VREF R1/R2 2.2µF 0.500
analog microelectronics
April 9/10
VOLTAGE/CURRENT CONVERTER
TYPICAL TWO-WIRE APPLICATION
VREF
AM422
RSET
AM422-2
VSET VREF
VOFFSET
5/10 Reference
Amplifier
IOUT
Ground
Figure Used two-wire circuit (AM422-2) ground (GND, connected between load resistor (Figure relationship R1/R2, using equation becomes VINmax OUTmax current ISET used output current offset calculated using equation (VIN VREF RSET RSET
With resistor RSET becomes (equation RSET VREF
Example Output current range 4.20mA this case values external devices (VIN 0.1V) follows RSET 2.64k R1/R2 0.25 0.500 2.2µF 100nF
information provided herein believed reliable; however, Analog Microelectronics assumes responsibility inaccuracies omissions. Analog Microelectronics assumes responsibility this information, such information shall entirely user's risk. Prices specifications subject change without notice. patent rights licences circuits described herein implied granted third party. Analog Microelectronics does authorise warrant Analog Microelectronics product life support devices and/or systems.
analog microelectronics
April 10/10

Wide Supply Voltage Range: 6.35V Wide Operating Temperature Range: -40

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