Very Offset Voltage: Input Bias Current: High Input Sensitivity High C

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Very Offset Voltage: Input Bias Current: High Input Sensitivity High C

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High Precision Instrumentation Amplifier
Very Offset Voltage: Input Bias Current: High Input Sensitivity High CMRR: 90dB Wide Operating Temperature Range: -40°C.+140°C Ratiometrical Output Voltage Adjustable Rail-to-Rail Output Stage: 0.5.4.5V Single Supply Device Source Sink Capability Noise Behaviour
AM437
GENERAL DESCRIPTION
AM437 high precision amplifier, designed amplification sensor bridge signals smaller 10mV. single supply circuit consists high precision instrumentation amplifier (IA) integrated ratiometric output stage. Input offset voltages less than ±25µV (±1µV/°C) adjustable only externally trimmable resistors. monitoring amplified signal possible output makes adjustment easier. With externally adjustable gain output stage AM437 used different signal sources. sink source capability makes ideal high precision applications specially field automotive sensors.
APPLICATIONS
Small Signal (Bridge) Amplifier Automotive Applications Interface Interface Ceramic Sensors High Precision Amplifier Medical Instrumentation Data Acquisition
DELIVERY
DIL16 packages (samples, small quantities) SO16(n) packages Dice blue foil
BLOCK DIAGRAM
AM437
Output Stage
GAIN
RSET
VREFIN VREF
IAOUT
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 2000 Rev.
High Precision Instrumentation Amplifier
ELECTRICAL SPECIFICATIONS
Tamb 25°C (unless otherwise noted)
Parameter Supply Voltage Range Maximum Supply Voltage Quiescent Current Temperature Specifications Life Time Operating Tamb T85% 100°C T15% 120°C Tmax 140°C 2500/10 Symbol VCCmax 10k,VOUT 0.5V Conditions Min. 4.75 Typ.
AM437
Max. 5.25
Unit
Storage Junction Thermal Resistance
DIL16 plastic package SO16 narrow plastic package
°C/W °C/W
Instrumentation Amplifier Internal Gain Gain Drift
GINT dGIINT CMIR CMRR PSRR compensated uncompensated compensated uncompensated 10Hz 10Hz VIN+ VIN-
ppm/°C µV/°C µV/°C ±100 pA/°C pA/°C nV/Hz µVPP pA/Hz pAPP 1.25
Differential Input Voltage Common Mode Input Range Common Mode Rejection Ratio Power Supply Rejection Ratio Input Offset Voltage
Temperature
dVOS dVOS
Input Offset Current Temperature Input Bias Current Temperature Input-Refered Voltage Noise
dIOS
Input-Refered Current Noise
10Hz 10Hz
Output Voltage Range Output Current
VIAOUT IIAOUT Sourcing, VIAOUT max. Sinking, VIAOUT
0.15
Capacitive Load Stability Nonlinearity Reference Voltage Reference Voltage Output Current
CIAOUT
VREF IREF Sourcing Sinking
0.25
Note:
statistic measurements Ratiometrical Generator Source Resistance Full Scale
analog microelectronics
April 2000
High Precision Instrumentation Amplifier
Parameter Output Stage Adjustable Gain Common Mode Input Range Common Mode Rejection Ratio Power Supply Rejection Ratio Input Offset Voltage Temperature Input Bias Current Temperature Output Voltage Range GADJ CMIR CMRR PSRR dVOS VOUT,min VOUT,max Output Resistance Capacitive Load Stability Slew Rate Sink Capability Source Capability ROUT CLOAD ISink ISource CLOAD= 22nF VOUT 2.5V, GADJ VOUT 2.5V, GADJ 0.015 Sinking, IOUT 200µA Sourcing, IOUT 50µA 0.05 1.65 Symbol Conditions Min. Typ.
AM437
Max. Unit
±2.1 µV/°C pA/°C V/µs
ESD: This integrated circuit damaged ESD. Analog Microelectronics recommends that integrated circuits handled with appropriate precautions. Failure observe proper handling installation procedures cause damage. damage range from subtle performance degradation complete device failure. Precision integrated circuits more susceptible damage because very small parametric changes could cause device meet published specifications.
BOUNDARY CONDITIONS
Parameter Offset Compensation Resistor (IA) Offset Compensation Resistor (IA) Gain Resistor Gain Resistor Offset Compensation Resistor (Bridge) Offset Compensation Resistor (Bridge) Resistor
Symbol ROC1 ROC2 RSET RBRIDGE
Conditions
Min. 67.3
Typ.
Max. 68.7
Unit
75.0 76.8 78.7
Sensor Bridge Resistor
Differential Input Voltage
Notes:
offset adjustment described Functional Description. offset compensation over temperature only achieved choosing resistors ROC1 ROC2 with same temperature coefficient very close placement them circuit. good matching resistor RSET with bridge resistors forced. symmetry resistor half bridges better than
analog microelectronics
April 2000
High Precision Instrumentation Amplifier
FUNCTIONAL DIAGRAM
AM437
ROC1
ROC2
AM437-1
Output Stage
VOUT COUT
RSET
Ground
Figure Application non-compensated non-calibrated transducers
ROC1
ROC2
AM437-2
Output Stage
VOUT COUT
RSET Ground
Figure Application compensated calibrated transducers
analog microelectronics
April 2000
High Precision Instrumentation Amplifier
FUNCTIONAL DESCRIPTION
AM437
AM437 integrated high precision amplifier bridge output signals. Basically AM437 composed functional sections shown Figure high accuracy instrumentation amplifier (IA) allows amplification with high signal-to-noise ratio. offset compensation resistors ROC1 ROC2 offer possibility make input offset voltage instrumentation amplifier nearly zero. offset compensation over temperature only given resistors ROC1 ROC2 have same temperature coefficients. Furthermore, these resistors have placed very close together. also necessary similar metals connection sensor bridge AM437 avoid thermocouple effects. internal gain fixed value GINT 273. output voltage VIAOUT (pin given following equation: VIAOUT (VIN VVREF output stage de-couples thus improves performance AM437. gain factor GADJ fixed external resistors RG2. gain factor defined output signal VOUT (pin calculated with VOUT (VIN VVREF 14444244443
Span Adjustment
Offset Adjustment (only version AM437-2)
AM437 available versions. Type AM437-1 designed usage with non-compensated non-calibrated sensors using resistors offset calibration. Version AM437-2 specially developed sensor systems with calibrated transducers. remaining offset transducers calibrated variation VVREF. adjustment offset then: VVREF
entire sensor systems realised with different types AM437 only external components shown Figures Offset calibration instrumentation amplifier offset compensation handled with care because entire system performance depends Please note, that this offset adjustment doesn't include bridge offset. offset compensation done following order: 2.5V voltage between VIAOUT (pin VREF (pin adjusted zero Volt. VIAOUT increased increasing ROC1 decreased increasing ROC2.
analog microelectronics
April 2000
High Precision Instrumentation Amplifier
PINOUT
NAME RSET VREF VREFIN N.C. GAIN IAOUT N.C. I.C. I.C.
AM437
DESIGNATION Offset Compensation Resistor Offset Compensation Resistor Inverting Input (IA) Non-inverting Input (IA) Resistor Reference Voltage Ground Reference Voltage Input Connected Output Gain Adjustment Output (IA) Connected Supply Voltage Internally Connected Internally Connected
RSET VREF VREFIN
I.C. I.C. N.C. IAOUT GAIN N.C.
Figure
DELIVERY
AM437 available version: packages (samples) packages Dice blue foil
PINOUT
10,06 1,45 0,05 0,42 0,07 1,27 0,635 0°-10°
2,00
Figure
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 2000

Very Offset Voltage: Input Bias Current: High Input Sensitivity High C

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