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AM467 Scheda tecnica(PDF) 7 Page - Analog Devices

Il numero della parte AM467
Spiegazioni elettronici  Precision amplifier for bridge circuits
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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AM467 Scheda tecnica(HTML) 7 Page - Analog Devices

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Precision amplifier for bridge circuits
AM467
analog microelectronics
February 2011
Analog Microelectronics GmbH
Phone:
+49 (0)6131/91 073 – 0
7/9
An der Fahrt 13, D – 55124 Mainz
Fax:
+49 (0)6131/91 073 – 30
Rev. 1.1
Internet: http://www.analogmicro.de
Email:
info@analogmicro.de
Once these resistors have been mounted the calibration procedure is complete. Depending on the
accuracy of the resistors used an offset value of 0.5 V and a full scale signal of 4.5 V should have
been obtained.
Should the expected final accuracy require it, in an additional second stage (Stage 2) the offset of
the output voltage can be corrected using resistor R1. To this end the AM467 output must again be
measured at P = 0 bar. If at 0 bar the output is too high or too low by a few millivolts, for example,
the Excel program then calculates the necessary second correction of R1 in ohms.
The offset error which is then obtained if a different resistance is used in place of calculated
resistance R1 can also be determined by the Excel sheet. The sensitivity in mV/ohm is instrumental
here, providing information as to by how many millivolts the offset shifts when the used resistor R1
has a delta R (in ohms) to the calculated value. The given sensitivity value (mV/ohm) is multiplied
by the delta R of resistor R1 to obtain a change in offset which affects both the offset (0.5 V) and the
full scale signal (4.5 V).
Figure 2: Ceramic sensing element with AM467 and a calibration network
with external resistors.
DIMENSIONING
In the combination of ceramic sensing element and AM467 the operating point (the initial value of
the four resistors R1 to R4) was determined for all sensing elements in a specific sensing element
category. In the case of piezoceramic sensors the term "sensing element category" is used to denote
sensing elements with the following characteristics:
Bridge resistance: 11 kOhm ± 20%
Sensitivity: 2.4 ± 1 mV/V
IN+
IN-
AM467
3
2
AMP
VCC
8
OUT
1
GND
4
Vout
GND
C3
C2
R2
R1
R4
R3
Output stage
with short
circuit proofing
C4
C1


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