AM467 PRINCIPLE FUNCTION Adjustable amplification differenti

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AM467 PRINCIPLE FUNCTION Adjustable amplification differenti

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Precision amplifier bridge circuits
AM467
PRINCIPLE FUNCTION
Adjustable amplification differential input voltage signals (from ±100 adjustable, ratiometric output voltage 0.2V Vcc-0.2
5V+5%
Differential input voltages 5.+100mV
AM467
VOUT =0,2.VCC -0,2V (adjustable) e.g.0,5.4,5V ratiometric
TYPICAL APPLICATIONS
Amplifiers ceramic sensing elements Amplifiers sensing elements Amplifiers sensing elements industrial automotive applications
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: http://www.analogmicro.de Phone: Fax: Email: (0)6131/91 (0)6131/91 info@analogmicro.de
February 2007 Rev.
Precision amplifier bridge circuits
AM467
TABLE CONTENTS
PRINCIPLE FUNCTION TYPICAL APPLICATIONS FEATURES GENERAL DESCRIPTION BLOCK DIAGRAM ELECTRICAL SPECIFICATIONS DESCRIPTION FUNCTIONS EXAMPLE APPLICATION procedure detail (for calibration with discrete resistors) DIMENSIONING NOTES BLOCK DIAGRAM PINOUT FURTHER READING
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: http://www.analogmicro.de Phone: Fax: Email: (0)6131/91 (0)6131/91 info@analogmicro.de
February 2007 Rev.
Precision amplifier bridge circuits
AM467
FEATURES
Wide differential input voltage range FS.±100 offset offset drift input noise High CMRR: Wide operating temperature range: +125 Adjustable output voltage Rail-to-rail output stage: VOUT Sink/source output Single ratiometric supply: Integrated protective functions Overvoltage protection Integrated protective functions Short-circuit-proofing Small-scale design
GENERAL DESCRIPTION
AM457 high-precision integrated amplifier which been developed condition signals from small differential input voltages within range millivolts ±100 FS). chief component highly accurate, low-noise amplifier circuit which adjusted sensing elements using external network resistors. With exception additional operational amplifier diagnostic unit AM467's pins functions compatible with AM457. rail-to-rail output makes suitable amplification piezoceramic sensing elements measuring cells with respect specific calibration network.
BLOCK DIAGRAM
AM467
Inputamplifier
Output stage
Biasing Unit
Short circuit protection Current limitation
Figure Block diagram AM467
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: http://www.analogmicro.de Phone: Fax: Email: (0)6131/91 (0)6131/91 info@analogmicro.de
February 2007 Rev.
Precision amplifier bridge circuits
AM467
ELECTRICAL SPECIFICATIONS
(with reference example application)
Tamb 25°C, (unless otherwise stated)
Parameter Voltage Range Quiescent Current Temperature Specifications Operating Storage Junction Amplifier Offset Voltage Temperature Temperature Input Bias Current Temperature Differential Input Voltage Input Offset Current Temperature Input Resistance Input Capacitance Common Mode Input Range Common Mode Rejection Ratio Open Loop Gain Adjustable Gain Output Voltage Range Guaranteed Output Current Output Load Resistance Power Supply Rejection Ratio Gain Bandwidth Product Linearity Slew Rate Input Voltage Noise Overvoltage Protection dVOS/dT dVOS/dT dIB/dT dIOS/dT CMIR CMRR VOUT IOUT PSRR R1,2=1k Rk=10k, C1=1nF, Ck=100pF, G/Go, 1nF; 100; fg=1kHz with Source Impedance 13.5 Sink source 1nF; Iout Tamb= 105°C Tamb= 125°C 2.5V Tamb= -45.125°C =Vout+ VoutSee Figure 2.5V Tamb= 125°C IB,typ (VCM 2.5V) design 10-4 V/µs nV/Hz ±0.5 ±2.5 pA/°C -0.13 ±0.1 ±0.5 ±0.3 -0.6 ±100 µV/°C µV/°C nA/°C Tamb Symbol Tamb +125°C Conditions Min. Typ. Max. Unit
VOUT sink source
Table Specifications Currents flowing into negative. Input Common Mode Voltage
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: http://www.analogmicro.de Phone: Fax: Email: (0)6131/91 (0)6131/91 info@analogmicro.de
February 2007 Rev.
Precision amplifier bridge circuits
AM467
EXTERNAL COMPONENTS
Parameter Output Capacitor Compensation Capacitor Stabilization Capacitor (optional) Protection Capacitor (optional) Load Resistor GND, Symbol Vout max. Vout Conditions Min. Typ. Max. Unit
Table External components calibration network
Recommended: ceramic capacitors
DESCRIPTION FUNCTIONS
AM457 integrated precision circuit signal amplification high-impedance signal sources signal conditioning sensor bridges with sensitivity, particularly ceramic sensing elements measuring cells. generates rail-to-rail output signal Vcc-0.2 amplification offset independently another using external resistors. Through suitable dimensioning external resistors particular output voltage 0.5.4.5 also provided. these values standard following description refers this output voltage. AM467 works principle ratiometry with supply voltage ±5%. distinguished offset extremely thermal offset drift across wide temperature range, enabling classified precision amplifier. sink source output stage protected internally against short-circuiting. AM467 design incorporates protective measures against interference from using suitable semiconductor structures. With exception additional operational amplifier diagnostic unit compatible with AM457. AM467 thus smaller chip surface lower power consumption. AM467 used autonomous signal conditioning preamplifier converter back-end digitization.
EXAMPLE APPLICATION
AM457 suitable amplification resistance networks connected Wheatstone bridge with four resistors which have sensitivity, such mV/V with supply, example. example sensor application described herein which
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: http://www.analogmicro.de Phone: Fax: Email: (0)6131/91 (0)6131/91 info@analogmicro.de
February 2007 Rev.
Precision amplifier bridge circuits
AM467
based piezoceramic sensing element such above calibrated output signal 0.5.4.5 (sensor system). basic calibration procedure sensor system calibrated stages. Using mathematical algorithm (Excel sheet: Cali_AM467_rev1.xls) taking AM467's measured output voltage values individual sensor bridge values basis, values resistors (calibration resistors) calculated. calibration system effective errors (parasitic effects component tolerances) taken into account. sensing element first measured secondly electrical characteristics sensor using predefined precision measuring resistors. This information then processed Excel program calculate setpoint calibration resistors which then swapped with given measuring resistors added circuit accordingly. necessary, second stage offset output voltage corrected using information given Excel sheet. procedure detail (for calibration with discrete resistors) order evaluate sensor system signal four resistors required (see Figure values resistors fixed network have adjusted during calibration. Like capacitors they mounted circuit board outset. Resistors measuring resistors assembled measuring apparatus sensor systems sensing element category (see Dimensioning). Their values must close possible those calculated Analog Microelectronics relevant sensing element category. With described components sensor signal operating point which then enables calibration. this purpose electrical characteristics sensing element first determined without evaluation circuitry being connected (Stage Using Excel calibration software (Kali_AM467.xls) necessary calibration parameters are: sensing element resistance (RBR), average output voltage sensing element (VBR) system's supply voltage (VCC). Once these three values have been determined sensing element connected evaluation circuit. output signal AM467 (Out1 Out2) measured zero full pressure (offset full scale signal) entered into Excel program with bridge values including values given maximum pressure sensing element (Pmax). Taking these values applying them calibration algorithm resistors calculated separately each individual system. These then replace measuring resistors have soldered onto circuit board.
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: http://www.analogmicro.de Phone: Fax: Email: (0)6131/91 (0)6131/91 info@analogmicro.de
February 2007 Rev.
Precision amplifier bridge circuits
AM467
Resistors described calibration resistors. These stipulate final operating point. Once these resistors have been mounted calibration procedure complete. Depending accuracy resistors used offset value full scale signal should have been obtained. Should expected final accuracy require additional second stage (Stage offset output voltage corrected using resistor this AM467 output must again measured bar. output high millivolts, example, Excel program then calculates necessary second correction ohms. offset error which then obtained different resistance used place calculated resistance also determined Excel sheet. sensitivity mV/ohm instrumental here, providing information many millivolts offset shifts when used resistor delta ohms) calculated value. given sensitivity value (mV/ohm) multiplied delta resistor obtain change offset which affects both offset (0.5 full scale signal (4.5
AM467
Output stage with short circuit proofing
Vout
Figure Ceramic sensing element with AM467 calibration network with external resistors.
DIMENSIONING
combination ceramic sensing element AM467 operating point (the initial value four resistors determined sensing elements specific sensing element category. case piezoceramic sensors term "sensing element category" used denote sensing elements with following characteristics:
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: http://www.analogmicro.de Phone: Fax: Email: (0)6131/91 (0)6131/91 info@analogmicro.de
February 2007 Rev.
Precision amplifier bridge circuits
AM467
Bridge resistance: kOhm Sensitivity: mV/V Offset: mV/V Supply voltage: following values obtained above sensing element categories: Fixed resistor accuracy Fixed resistor accuracy Measuring resistor accuracy 0.1% Measuring resistor accuracy 0.1% (optional) (ceramic) (ceramic) optional (ceramic)
NOTES
bridge circuits with characteristics other than above (with other sensing element categories, such sensing elements, example) Analog Microelectronics adapt dimensioning program request. Excel program (Cali_AM467_rev1.xls) used calibration (the calculation definitive operating point). This available www.analogmicro.de website.
DIAGRAM PINOUT
AM467
Output stage with short circuit proofing
ININ+
N.C. N.C. N.C.
Figure AM467 Pinout
Figure Diagram AM467
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: http://www.analogmicro.de Phone: Fax: Email: (0)6131/91 (0)6131/91 info@analogmicro.de
February 2007 Rev.
Precision amplifier bridge circuits
AM467
NAME ININ+ EXPLANATION Output Negative Input Positive Input Ground function function function Supply Voltage
N.C. N.C. N.C.
Table configuration AM467 package dimensions see:
FURTHER READING
AM467 identical specifications AM457 with exception diagnosis calibration guidelines given latter also apply AM467, available www.analogmicro.de various different networks. AN1009 Application description AN1011 Calibration sensing elements AN1012 Calibration piezoceramic sensing elements
DELIVERY OPTIONS
AM467 available Dice wafer blue foil request)
NOTES
Analog Microelectronics reserves right make amendments dimensions, technical data other information without prior notice.
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: http://www.analogmicro.de Phone: Fax: Email: (0)6131/91 (0)6131/91 info@analogmicro.de
February 2007 Rev.

AM467 PRINCIPLE FUNCTION Adjustable amplification differenti

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