AM417 – Ratiometric instrumentation

amplifier with adjustable output stage

Analog Microelectronics GmbH

An der Fahrt 13, D – 55124 Mainz

July 2008 –Rev 3.1- Page 17/18

Phone:+49 (0)6131/91 073-0

Fax: +49 (0)6131/91 073-30

Internet: http://www.analogmicro.de

Email: info@analogmicro.de

EXAMPLE APPLICATIONS

• Interface IC for sensing elements in a resistor bridge circuit (e.g. piezoresistive pressure sensing

elements) with electronic compensation of errors via an external microcontroller. In this

application AM417 is used as a preamplifier to set the operating point.

• Signal conditioning IC with an external, analog compensation network, in which the offset can

be adjusted using additional resistors on the sensing element and the gain using AM417.

How to protect the output of the AM467 against reverse polarity see [3]

µP

V

OU T = 0, 2V. ..V

-0,2V

CC

0,5-1,25mA

V

CC = 5V

5%

+

AM417

Figure 7:

Application for sensing elements with

an external microcontroller or ADC

AM417

V

OUT = 0,5... 4,5V 11mA

V

CC = 5V

5%

+

0,5 - 1,25mA

/

Figure 8:

Application as a signal conditioning IC with an

external compensation network