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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CURRENT CONVERTER
Wide Supply Voltage Range: 6.35V Wide Operating Temperature Range: -40°C.+85°C Adjustable Reference Voltage Source: Additional Voltage Current Source Instrumentation Amplifier with Wide Input Voltage Range Adjustable Gain Offset Two-Wire Operation: 4.20mA Three-Wire Operation: 0/4.20mA Adjustable Output Current Range Current Shutdown with Overvoltage Possible Shutdown with Excessive Temperature
AM442
GENERAL DESCRIPTION
AM442 monolithically integrated current converter which been specially developed processing differential bridge signals. AM442 suitable two- three-wire applications four function blocks. highprecision instrumentation amplifier (IA) serves input stage. reference voltage source, which adjusted values between 10V, excites external components voltage-controlled current output stage converts voltage signal. operational amplifier also integrated device which wired either current voltage source. thus possible generate output currents which correspond normal industrial standards (0/4- 20mA, 8mA).
APPLICATIONS
Industrial Process Control Sensor Signal Converter (e.g. pressure) Programmable Current Source
DELIVERY
DIL16 packages SO16(n) packages Dice blue foil
BLOCK DIAGRAM
CVREF CVSET VSET VREF
AM442
Reference Voltage
GAIN- GAIN GAIN+
Figure
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: http://www.analogmicro.de Phone: (0)6131/91 Fax: (0)6131/91 E-mail: info@analogmicro.de
August 2001 Rev.
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 Current/Voltage Source Internal Reference Temperature Current Source: VBG/REXT Adjustable Current Range Output Voltage ICV* Voltage Source: (REXT1 REXT2) REXT2 Adjustable Voltage Range Output Current Load Capacitance Stage Internal Gain Input Voltage Offset Voltage Temperature Input Bias Current Temperature GSET VSET dVOS/dT dIB/dT ±0.5 ±1.6 ICV* Source Sink Source mode dVBG/dT Tamb 40.+85°C 1.20 1.27 IREF Tamb 40.+85°C 6V.35V 6V.35V, IREF VSET connected VSET GND, 4.75 0.05 0.06 5.00 10.0 DIL16 plastic package SO16 narrow plastic package Symbol Tamb 40.+85°C, IREF Conditions Min. Typ.
AM442
Max.
Unit
°C/W °C/W
5.25 10.5 VR10 ±140 0.10 0.15
ppm/°C ppm/V ppm/V %/mA %/mA
1.35 ±140
ppm/°C
-100
1.15 ±1.5
µV/°C pA/°C
2-wire operation maximum current IOUTmin valid Currents flowing into negative
analog microelectronics
August 2001
CURRENT CONVERTER
Parameter Instrumentation Amplifier Adjustable Gain Differential Input Voltage Range Common Mode Input Range CMIR CMIR Common Mode Rejection Ratio Power Supply Rejection Ratio Offset Voltage Temperature Input Bias Current Temperature Input Offset Current Temperature Output Voltage Range Load Capacitance 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 Limitation Switch-Off 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 GIA, VREF, VSET/2 IOUTFS ROUT adjustable 0.75 1.00 1.00 CMRR PSRR dVOS/dT dIB/dT dIOS/dT VOUTFS VOUTFS VGAIN+ VGAIN- Symbol Conditions Min. Typ.
AM442
Max. Unit
580/GIA
µV/°C
pA/°C pA/°C
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
analog microelectronics
August 2001
CURRENT CONVERTER
BOUNDARY CONDITIONS
Parameter Sense Resistor Symbol Stabilisation Resistor Load Resistance Gain Resistors 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.
AM442
Max.
Unit
FUNCTIONAL DIAGRAMS
Voltage Reference Current Source
3-Wire System
IOUT
Ground
Figure
Voltage Reference Current Source
2-Wire System
IOUT
Ground
Figure
analog microelectronics
August 2001
CURRENT CONVERTER
FUNCTIONAL DESCRIPTION
AM442
AM442 monolithically integrated current converter which been specially developed processing differential bridge signals. varying external components, output current various values within wide range. Only external output transistor diode needed (See Figure Figure addition resistors capacitor (C2). external transistor decreases power dissipation diode protects transistor against reverse polarity. maximum power dissipation components must taken into consideration when selecting transistor diode. Typical values external components given following Description Applications. AM442 principally used implementation two- three-wire systems industrial applications. schematic diagram illustrates three-wire system Figure Here, differential input voltage (VIN) shown variable resistor. external reference point Ground identical ground (GND) supply voltage matches that system: two-wire configurations, however (Figure ground (GND) connected between resistors this instance, supply voltage (VCC) dependent supply voltage system value load resistor (RL). calculated using equation: IOUT AM442 basically made four function blocks (see Figure amplification high-precision instrumentation amplifier input stage adjustable thus makes applications number input signals sensors possible. Gain external resistors When selecting resistors, given Boundary Conditions must heeded. When configuring instrumentation amplifier, user should ensure that input signal correct polarity. voltage-controlled current output offset current output with help internal voltage reference across external resistors (see Description Applications, beginning page Output current IOUT provided external transistor which driven output (OUT) particular feature AM442 that also shutdown output current desired (disable DIS). This used select required behaviour When disable connected reference voltage VREF, output current switched-off overDIS VREF IOUT [mA] voltage occurs input side device. disable connected, current shutdown mode activated (Figure An20 other safety feature included AM442 integrated powerdown function with excessive tem4 perature. With this, output curDIS connected rent switched gets [mV] VLIMR0 warm. Figure
analog microelectronics
August 2001
CURRENT CONVERTER
AM442
adjustable reference voltage source supplies sensors other external components with voltage (VSET N.C. VSET GND). Additionally, voltage value between external voltage divider. Please note, that Capacitor (ceramic) must also connected even when voltage reference used. additional operational amplifier used current voltage source. Initial Operation AM442 compensate offset output current first time, input must short-circuited (VIN doing should ensured that input pins instrumentation amplifier have voltage potentials given Electrical Specifications (input voltage range). short circuit input produces output current IOUT ISET with (VIN VREF
adjustment output current range depends choice external resistors maximum output current defined general transfer function following equation given output current IOUT:
gain factor instrumentation amplifier determined input voltage maximum output current IOUTmax. minimum supply voltage dependent value reference voltage. following applies: VREF choice supply voltage also depends load resistor used application. following inequation determines minimum supply voltage: IOUTmax +VCCmin resulting operating range given Figure Example calculations typical values external components found example application shown Description Applications from page onwards.
VCCmin IOUTmax
VCCmin RLmax IOUTmax 20mA
Operating Area
Figure
analog microelectronics
August 2001
CURRENT CONVERTER
PINOUT
NAME OUT. CVREF CVSET GAIN- GAIN GAIN+ VSET VREF
AM442
DESIGNATION Sense Resistor Supply Voltage Sense Resistor Output Current/Voltage Reference Current/Voltage Output Current Input Negative Input Positive Gain Adjustment Gain Adjustment Gain Adjustment Reference Voltage Select Ground Reference Voltage Output Adjustment Output Stage
CVREF CVSET
VREF VSET GAIN+ GAIN GAIN-
Figure
DELIVERY
AM442 available version: packages (samples) packages (maximum power dissipation 300mW) Dice blue foil
PACKAGE DIMENSIONS SO16
10,06 1,45 0,05 0,42 0,07 1,27 0,635 0°-10°
2,00
Figure
analog microelectronics
August 2001
CURRENT CONVERTER
TYPICAL THREE-WIRE APPLICATION (0/4-20mA)
RREF
AM442
AM442
RSET
Voltage Reference
IOUT Ground
Figure three-wire circuit, (VCC) connected (RS+) ground (GND) Ground. application shown here (Figure output that output current shutdown with overvoltage input (DIS VREF). Gain adjusted external resistors produces: 20mA application, current ISET zero (ISET GND). transfer function output current IOUT thus: Supply voltage must selected accordance with load resistor IOUTmax measuring bridge supplied with current additional operational amplifier. Supply current sensor bridge determined resistor RSET: RSET
Example: output current range 0.20mA following values components given: 0K250 VREF 0.600 2.2µF
analog microelectronics
August 2001
CURRENT CONVERTER
TYPICAL TWO-WIRE APPLICATION (4-20mA)
AM442
AM442
Voltage Reference
IOUT Ground
Figure two-wire circuit, (VCC) connected (RS-) ground (GND, application shown here (Figure output that output current shutdown with overvoltage input (DIS connected). Gain adjusted external resistors produces: transfer function output current IOUT thus 20mA application, current ISET adjusted external resistors VREF Supply voltage must selected accordance with load resistor IOUTmax Example: output current range 4.20mA following values components given: 0K200 VREF 100k 0.5k 0.600 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
August 2001

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

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