Precision amplifier for bridge circuits

AM467

analog microelectronics

February 2007

Analog Microelectronics GmbH

Phone: +49 (0)6131/91 073 – 0

8/9

An der Fahrt 13, D – 55124 Mainz

Fax:

+49 (0)6131/91 073 – 30

Rev. 1.0

Internet: http://www.analogmicro.de

Email:

info@analogmicro.de

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:

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

Figure 3: Diagram of AM467

1

8

2

7

36

4

5

OUT

IN-

IN+

GND

VCC

N.C.

N.C.

N.C.

Figure 4: AM467 Pinout

AM467

AMP

+

-

GND

4

1

OUT

8

VCC

IN- 2

Output stage

with short

circuit proofing