Precision amplifier for bridge circuits AM457
analog microelectronics May 2005
Analog Microelectronics GmbH Phone: +49 (0)6131/91 073 – 0 1/10
An der Fahrt 13, D – 55124 Mainz Fax: +49 (0)6131/91 073 – 30 Rev. 2.2
Internet: www.analogmicro.de Email: info@analogmicro.de

PRINCIPLE FUNCTION
Adjustable amplification of differential voltage signals (±5 to ±100mV FS)
to an adjustable, ratiometric output voltage of between
0.2 and Vcc-0.2Volt with a diagnostic unit


TYPICAL APPLICATIONS
• Precision amplifiers for bridge circuits with
low sensitivity:
for ceramic measurement cells
for DMS sensing elements
for GMR sensing elements
• Sensor amplification with functional control
AM457
V = 5V 5%
CC
±
I = 2mA
out
Differential input
voltages
(5.. 100mV FS)
e.g. V = 0.2...V -0.2V
(adjustable)
e.g. 0.5...4.5V
ratiometric
OUT CC
Diagnostic unit