Wide Supply Voltage Range: 6.35V Wide Operating Temperature Range: -40
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SENSOR TRANSMITTER
Wide Supply Voltage Range: 6.35V Wide Operating Temperature Range: -40°C.+85°C Small Package: Reference Voltage Source: Additional Voltage Current Source Instrumentation Amplifier with Wide Input Voltage Range Adjustable Gain Offset Analog Voltage (0.5/10V), Current (0/4.20mA), Output Converter Parallel Three-Wire Operation Protection Against Reverse Polarity
AM400
GENERAL DESCRIPTION
AM400 monolithically integrated current transmitter which been specially developed processing differential bridge signals. special feature device parallel voltage current output. high-precision instrumentation amplifier (IA) serves input stage. reference voltage source excites external components. Either voltage-controlled current output stage voltage output stage convert input signal. operational amplifier also integrated device which wired either current voltage source. thus possible generate output currents voltages which correspond normal industrial standards (0/4-20mA, 0-5/10V).
APPLICATIONS
Industrial Process Control Sensor Transmitter (e.g. pressure) Programmable Current Source
DELIVERY
DIL20/SO20(w) SO16(n) packages Dice blue foil
BLOCK DIAGRAM
CVREF VREF
AM400-1
CVSET
Reference
RSIOUT
GAIN OUTAD INDA
VOUT
IN13
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
June 2000 1/10 Rev.
SENSOR TRANSMITTER
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 Instrumentation Amplifier Internal 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 CMRR PSRR dVOS/dT dIB/dT ±1.5 -100 -0.4 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.
AM400
Max.
Unit
°C/W °C/W
5.25 10.5 VR10 10.0 ±140 0.10 0.15
ppm/°C ppm/V ppm/V %/mA %/mA
1.35 ±140
ppm/°C
-100
±400 µV/°C -250 -0.9 nA/°C
analog microelectronics
June 2000 2/10
SENSOR TRANSMITTER
Parameter Instrumentation Amplifier (cont.) Output Voltage Range VOUTIA VOUTIA Minimum Output Voltage Load Capacitance Zero Adjust Stage Internal Gain Input Voltage Offset Voltage Temperature Input Bias Current Temperature Operational Amplifier Gain Stage Adjustable Gain Input Range GGAIN Power Supply Rejection Ratio Offset Voltage Temperature Input Bias Current Temperature Output Voltage Limitation Output Voltage Range PSRR dVOS/dT dIB/dT VLIM VOUTAD VOUTAD Load Capacitance Operational Amplifier Output Stage Internal Gain Input Range Power Supply Rejection Ratio Offset Voltage Temperature Input Bias Current Temperature Output Voltage Range PSRR dVOS/dT dIB/dT VOUT VOUT Output Current Limitation Output Current Load Resistance Load Capacitance Converter Internal Gain Trim Range Voltage Range Offset Voltage Temperature VR0FS dVOS/dT adjustable 0.75 0.125 1.00 ILIM IOUT VOUT 2.15 ±0.5 2.20 ±0.5 VREF dVOS/dT dIB/dT VOUTIA ±0.5 ±1.6 VOUTIAmin CL** RLIA RLIA without external load resistance RLIA 0*** 0*** Symbol Conditions Min. Typ.
AM400
Max. Unit
VOUTIA ±2.0
µV/°C pA/°C
VREF
µV/°C pA/°C
2.25 ILIM µV/°C pA/°C
1.25 µV/°C
analog microelectronics
June 2000 3/10
SENSOR TRANSMITTER
Parameter Converter (cont.) Input Resistance Temperature Output Offset Current IOUTOS Temperature Output Offset Current IOUTOS Temperature Output Control Current IOUTC Temperature Output Voltage Range dRIN/dT IOUTOS dIOUTOS/dT IOUTOS dIOUTOS/dT IOUTC dIOUTC/dT VOUT VOUT Output Current Range Output Resistance Load Capacitance Stage Internal Gain Input Voltage Offset Voltage Temperature Input Bias Current Temperature Protection Functions Voltage Limitation Protection against reverse polarity Current case reverse polarity System Parameters Nonlinearity ideal input 0.05 VLIMR0 VLIMR0 VSET/2 Ground VOUT Ground IOUT Ground 35V, IOUT VREF/8 GSET VSET dVOS/dT dIB/dT ±0.5 ±1.6 IOUTFS ROUT 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 Symbol Conditions Min. Typ.
AM400
Max. Unit
k/°C nA/°C nA/°C nA/°C
1.15 ±1.5
µV/°C pA/°C
0.15
2-wire operation maximum current IOUTmin valid Only available form version Depending external load resistance output (RLIA VOUTIA 3mV); internal load resistance 100k 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
June 2000 4/10
SENSOR TRANSMITTER
FUNCTIONAL DIAGRAMS
3-Wire System Voltage Reference Current Source
AM400
VOUT
IOUT
Ground
Figure
FUNCTIONAL DESCRIPTION
AM400 monolithically integrated current transmitter 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. AM400 principally used implementation two- three-wire systems industrial applications. taken into account that applications with parallel current voltage output only 3-wire operation possible. 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, ground (GND) connected between resistors this instance, supply voltage (VCC) dependent supply voltage system value load resistor (RL). calculated using equation:
basically made following function blocks (see Figure high accuracy instrumentation amplifier (IA) with internal gain possibility adjust bias voltage (pin used differential input signals. Following operational amplifier stage integrated, which allows adjust gain whole system. special function voltage limitation following value voltage reference integrated. voltage-controlled current output offset current output with help internal voltage reference across external resistors Output current IOUT provided external transistor which driven current output (IOUT) Using current voltage output
analog microelectronics
June 2000 5/10
SENSOR TRANSMITTER
AM400
same time fine adjustment current output possible variation safety feature included AM400 integrated power-down function with excessive temperature. With this, output current switched gets warm. operational amplifier stage represents voltage output amplifier stage internal gain 2.2. adjustable reference voltage source supplies sensors other external components with voltage (VSET N.C. VSET GND). Additionally, voltage value between external voltage divider. Important: Please note, that Capacitor (ceramic) must also connected even when voltage reference used. additional operational amplifier used current voltage source external components. Important: used function blocks have connected. capacitors have connected case even when voltage reference used!
INITIAL OPERATION AM400-1-SO16
Voltage output
transfer function output voltage adjustable gain stage
VOUTAD IAVIN GGAIN
GGAIN
offset voltage which adjustable (e.g. usage additional operational amplifier, please Application Notes). entire output voltage valid
VOUT VINDA
minimum supply voltage which connected depending maximum output voltage: VOUTmax
Current output
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
adjustment output current range depends choice external resistors maximum output current defined general transfer function following equation given output current IOUT:
gain factor current output stage determined input voltage maximum output current IOUTmax. minimum supply voltage dependent value reference voltage. following applies:
analog microelectronics
June 2000 6/10
SENSOR TRANSMITTER
AM400
choice supply voltage also depends load resistor used application. following inequation determines minimum supply voltage:
OUTmax VCCmin
resulting operating area shown Figure Example calculations values external components listed Application Notes.
VCCmin IOUTmax
VCCmin RLmax IOUTmax 20mA
Operating Area
Figure
analog microelectronics
June 2000 7/10
SENSOR TRANSMITTER
PINOUT AM400-1-SO16N
NAME CVREF CVSET GAIN OUTAD INDA IOUT VOUT VREF
AM400
BEDEUTUNG Current/Voltage Reference Adjustment Current/Voltage Reference Input Positive Input Negative Adjustment Gain Output Converter Input Output Stages Current Output Sense Resistor Supply Voltage Sense Resistor Voltage Output Zero Adjustment Ground Output Reference Voltage Adjustment Output Offset Current
CVREF CVSET GAIN OUTAD INDA IOUT
VREF VOUT
Figure
DELIVERY
AM400-1 available version: packages (maximum power dissipation 300mW)
PACKAGE DIMENSIONS SO16
10,06 1,45 0,05 0,42 0,07 1,27 0,635
2,00
0°-10°
Figure
analog microelectronics
June 2000 8/10
SENSOR TRANSMITTER
TYPICAL APPLICATION (4-20mA/0-10V)
AM400
AM400-1
Reference
RSET
VOUT
IOUT
Ground
Figure
3-wire operation (Figure (VCC) connected with (RS+), ground (GND) connected with Ground. output voltage valid GND) with GGAIN VOUT output current 4-20mA application valid with GGAIN with output offset current
measurement bridge current supplied additional supply current adjusted variation resistor RSET
RSET
Example: Output current range 4.20mA, output voltage range 0.10V With 0K100mV following values external components valid: 28.4 80.9k 0.600 2.2µF
0.5k
analog microelectronics
June 2000 9/10
SENSOR TRANSMITTER
BLOCK DIAGRAM VERSION DICE
CVREF VSET VREF
AM400
AM400
CVSET
Voltage Reference
RSIOUT
VOUT
INZA OUTIA INOP GAIN OUTAD INDAI INDAV
Figure
PINOUT VERSION
NAME CVREF CVSET OUTIA INOP GAIN OUTAD INDAI INDAV IOUT VOUT VSET VREF DESIGNATION Current/Voltage Reference Adjustment Current/Voltage Reference Input Positive Input Negative Output Input Positive Gain Amplifier Adjustment Gain Output Converter Input Current Output Stage Input Voltage Output Stage Current Output Sense Resistor Supply Voltage Sense Resistor Voltage Output Adjustment Reference Voltage Zero Adjustment Ground Output Reference Voltage Adjustment Output Offset Current
CVREF CVSET OUTIA INOP GAIN OUTAD INDAI INDAV
VREF VSET VOUT IOUT
Figure
DELIVERY VERSION
packages Dice blue foil
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
June 2000 10/10
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