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: Wide Common Mode Range Instrumentation Amplifier Adjustable Gain Offset Two-Wire Output: 4.20mA Three-Wire Output: 0/4.20mA Adjustable Output Current Range Protection Against Reverse Polarity Current Shutdown with Overvoltage Shutdown with Excessive Temperature
AM402
GENERAL DESCRIPTION
AM402 monolithically integrated current converter which been specially developed processing differential bridge signals. AM402 suitable two- threewire applications four function blocks. high-precision 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. thus possible generate output currents which correspond normal industrial standards (0/4-20mA, 8mA).
DELIVERY APPLICATIONS
Industrial Process Control Sensor Signal Converter (e.g. pressure) Programmable Current Source DIL16 packages (samples) SO16(n) packages Dice blue foil
BLOCK DIAGRAM
GAIN- GAIN GAIN+ VSET VREF
AM402
Reference Voltage
Instrumentation 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 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 Stage Internal Gain Input Voltage Offset Voltage Temperature Input Bias Current Temperature 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 CMRR PSRR dVOS/dT dIB/dT dIOS/dT VOUTFS VOUTFS VGAIN+ VGAIN- GSET VSET dVOS/dT dIB/dT ±0.5 ±1.6 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.
AM402
Max.
Unit
°C/W °C/W
5.25 10.5 VR10 ±140 0.10 0.15
ppm/°C ppm/V ppm/V %/mA %/mA
1.15 ±2.5
µV/°C pA/°C
580/GIA
µV/°C
pA/°C pA/°C
analog microelectronics
April
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 GIA, VSET/2 IOUTFS ROUT adjustable 0.75 1.00 1.00 Symbol Conditions Min. Typ.
AM402
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 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. Max. Unit
analog microelectronics
April
CURRENT CONVERTER
FUNCTIONAL DIAGRAMS
Reference Voltage
AM402
3-Wire System
IOUT
Ground
Figure
Reference Voltage
2-Wire System
IOUT
Ground
Figure
FUNCTIONAL DESCRIPTION
AM402 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. AM402 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:
analog microelectronics
April
CURRENT CONVERTER
AM402
AM402 basically made three 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 (IOUT) particular feature AM402 that output current switched-off overvoltage occurs input side device. Another safety feature included AM402 integrated power-down function with excessive temperature. With this, output current switched gets warm. 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. Initial Operation AM402 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
VCCmin
choice supply voltage also depends load resistor used application. following inequation determines minimum supply voltage:
OUTmax VCCmin
VCCmin IOUTmax
RLmax IOUTmax 20mA
Operating Area
resulting operating range given Figure Example calculations typical values external components found example application shown Applications from page onwards.
Figure
analog microelectronics
April
CURRENT CONVERTER
PINOUT
NAME N.C. N.C. GAIN- GAIN GAIN+ VSET N.C. VREF
AM402
DESIGNATION Sense Resistor Supply Voltage Sense Resistor Connected Output Connected Output Current Input Negative Input Positive Gain Adjustment Gain Adjustment Gain Adjustment Reference Voltage Select Ground Connected Reference Voltage Output
N.C. N.C.
VREF N.C. VSET GAIN+ GAIN GAIN-
Figure
DELIVERY
AM402 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
April
CURRENT CONVERTER
TYPICAL THREE-WIRE APPLICATION (0/4-20mA)
AM402
VREF
5/10 reference
IOUT Ground
Figure Used three-wire circuit, (VCC) connected (RS+) ground (GND) connected Ground (Figure Gain adjusted external resistors calculated Hence, transfer-function output current IOUT becomes with current ISET adjusted external resistors VREF supply voltage must chosen with respect load resistor described following equation IOUTmax Example Output current range 4.20mA values external devices 0K50 VREF follows 4.7k 100k 0.5k 0.500 2.2µF Example Output current range 0.20mA values external devices 0K250 VREF follows used (SET GND) 0.500 2.2µF
analog microelectronics
April
CURRENT CONVERTER
TYPICAL TWO-WIRE APPLICATION (4-20mA)
AM402
VREF
5/10 reference
IOUT
Ground
Figure Used two-wire circuit, (VCC) connected (RS-) ground (GND, connected (Figure Gain adjusted external resistors calculated Hence, transfer-function output current IOUT becomes with current ISET adjusted external resistors VREF supply voltage must chosen with respect load resistor described following equation IOUTmax Example Output current range 4.20mA values external devices 0K200 VREF follows 0.500 2.2µF 100k 100nF 0.5k
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

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

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