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