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參數(shù)資料
| 型號(hào)： | AM457 |
| 廠商： | AME, Inc. |
| 英文描述： | Precision amplifier for bridge circuits |
| 中文描述： | 精密放大器電路的橋梁 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大小： | 271K |
| 代理商： | AM457 |
Precision amplifier for bridge circuits
AM457
analog microelectronics
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: www.analogmicro.de
May 2005
Phone: +49 (0)6131/91 073 – 0
Fax:
+49 (0)6131/91 073 – 30
Email:
info@analogmicro
.
de
7/10
Rev. 2.2
EXAMPLE APPLICATION
Offset and span compensation for a Wheatstone bridge with discrete adjusting resistors.
AM457 is suitable for the amplification of all resistance bridge circuits (four-resistor bridges)
with low sensitivity.
To compensate for or calibrate the offset and span and to amplify the signal as necessary a network
was developed (see Figure 2) for a four-resistor resistance bridge circuit (such as a DMS sensing
element, for example) consisting of the resistance bridge, an AM457 IC, four resistors and a
maximum of six capacitors (see [1]). AM457's characteristics define the network and the IC
amplifies the bridge output signal to the required output values.
Figure 2:
Schematic circuit diagram for resistance bridges with low sensitivity
The formulae used here to calibrate the offset and span of a bridge circuit are calculated using a
model which is based on the classic Wheatstone bridge circuit of four resistors.
On the basis of this model three simple equations were approximated for the setting of the resistors;
they are also suitable for calibration using a minimum of data pertinent to the sensing element and
without any need for further correction.
OP
AMP
Temp
V
CC
AM457
1
Diagnostic
unit
2
3
4
5
6
7
8
OUTOP
IN+
INOP
GND
OUT
DIAG
VCC
1k
9k
R
4
R
1
R
3
V =5V
V
DIAG
V
OUT
GND
C
4
C
2
C
6
C
5
C
1
IN-
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