Precision amplifier for bridge circuits
AM467
Bridge resistance: 11 kOhm ± 20%
Sensitivity: 2.4 ± 1 mV/V
Offset: 0 to ± 0.3 mV/V
Supply voltage: 5 V ± 10%
The following values are obtained for the above sensing element categories:
Fixed resistor R
2
= 33 k; accuracy of 1%
Fixed resistor R
4
= 12 k; accuracy of 1%
Measuring resistor R
1
= 11 k; accuracy of 0.1%
Measuring resistor R
3
= 120 k; accuracy of 0.1%
C
1
= 100 nF (optional)
C
2
= 100 pF (ceramic)
C3 = 1 nF to 5 nF (ceramic)
C4 = 470 pF optional (ceramic)
NOTES
For bridge circuits with characteristics other than the above (with other sensing element categories,
such as DMS sensing elements, for example) Analog Microelectronics can adapt the dimensioning
program on request.
An Excel program (Cali_AM467_rev1.xls) is used for calibration (the calculation of the definitive
operating point). This is available on the www.analogmicro.de website.
DIAGRAM and PINOUT
AM467
8
VCC
IN+
3
IN-
2
+
-
AMP
Output stage
with short
circuit proofing
1
OUT
OUT
IN-
IN+
GND
1
2
3
4
8
7
6
5
VCC
N.C.
N.C.
N.C.
4
GND
Figure 4:
AM467 Pinout
Figure 3:
Diagram of AM467
analog microelectronics
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: http://www.analogmicro.de
Phone:
Fax:
Email:
+49 (0)6131/91 073 – 0
+49 (0)6131/91 073 – 30
info@analogmicro.de
February 2007
8/9
Rev. 1.0
AME [ ANALOG MICROELECTRONICS ]
