AM452 – Voltage-to-current transducer IC
with a differential input
TABLE OF CONTENTS
PRINCIPLE FUNCTION
FEATURES
SCHEMATIC
GENERAL DESCRIPTION
ELECTRICAL SPECIFICATIONS
BOUNDARY CONDITIONS
DETAILED DESCRIPTION OF FUNCTIONS
Instrumentation amplifier (IA)
Operational amplifier stage (OP1)
Zero adjust stage
SET stage
Voltage-to-current converter (V/I converter)
Reference voltage source
Additional operational amplifier OP2
OPERATING AM452
2- and 3-wire applications in general [2]
Differences in the AM452 circuitry with 2- and 3-wire applications
Selecting the supply voltage
Setting the offset and output current range for
V
IN
= 0
OPERATING AM452: IMPORTANT POINTS TO NOTE
DIMENSIONING
APPLICATIONS
Typical 3-wire application with a differential input signal
Typical 2-wire application with a differential input signal
Offset compensation using a voltage divider at SET stage
Using OP2 as a current source
Using OP2 as a voltage source
BLOCK DIAGRAM AND PINOUT
DELIVERY
PACKAGE DIMENSIONS
FURTHER READING
NOTES
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Phone: +49 (0)6131/91 073-0
Fax:
+49 (0)6131/91 073-30
Internet:
http://www.analogmicro.de
Email: info@analogmicro.de
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
February 2008 - Rev 1.2 - Page 2/21
AME [ ANALOG MICROELECTRONICS ]
