AM417 – Ratiometric instrumentation

amplifier with adjustable output stage

Analog Microelectronics GmbH

An der Fahrt 13, D – 55124 Mainz

July 2008 –Rev 3.1- Page 2/18

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

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

Internet: http://www.analogmicro.de

Email: info@analogmicro.de

CONTENTS

PRINCIPLE FUNCTION

1

TYPICAL APPLICATIONS

1

FEATURES

3

BLOCK DIAGRAM

3

ELECTRICAL SPECIFICATIONS

4

BOUNDARY CONDITIONS / EXTERNAL COMPONENTS

5

DESCRIPTION OF FUNCTIONS

6

Instrumentation amplifier

6

Current source

6

Output stage

6

CALIBRATION WITH A RESISTOR BRIDGE CIRCUIT

7

Setting the output span

7

Setting the output offset

7

EXAMPLES

10

Example 1: Piezoresistive pressure sensing element in a bridge circuit with a positive offset

10

Example 2: Piezoresistive pressure sensing element in a bridge circuit with a negative offset

11

Example 3: Piezoresistive pressure sensing element in a bridge circuit with a high positive offset

12

TEMPERATURE COMPENSATION OF THE OUTPUT SPAN

13

EXAMPLE

15

Example 4: TCS compensation of a piezoresistive pressure sensing element

15

BLOCK DIAGRAM AND PINOUT

16

DELIVERY

16

EXAMPLE APPLICATIONS

17

FURTHER READING

18