AM452 datasheet(3/21 Pages) WOLFSPEED

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AM452 – Voltage-to-current transducer IC

with a differential input

Analog Microelectronics GmbH

An der Fahrt 13, D – 55124 Mainz

February 2008 - Rev 1.2 - Page 3/21

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

Fax:

+49 (0)6131/91 073-30

Internet: http://www.analogmicro.de

Email: info@analogmicro.de

FEATURES

• Instrumentation amplifier input with a

wide voltage range of ±400mV

• Adjustable gain and offset

• Adjustable current output

(e.g. of 0/4...20mA)

• 2- and 3-wire operation

• Suitable for HART® applications

• Protection against reverse polarity and

short-circuiting

• Output signal limiting

• Integrated current source

• Adjustable integrated reference voltage

source of 5 to 10V

• Modular configuration

• Supply voltage of 6...35V

• Temperature range of -40°C...+85°C

• RoHS compliant

SCHEMATIC

Figure 1: Block diagram of AM452

GENERAL DESCRIPTION

AM452 is an integrated transducer with an

adjustable current output which has been

specifically designed for the conditioning of

differential

input

signals.

permits

the

independent adjustment of the offset and full-

scale current using just a few components.

The IC consists of various functional modules. In

addition to the instrumentation amplifier in the

signal path there is an operational amplifier which

is used to set the gain. The offset can be adjusted

using the Zero adjust stage and/or the SET stage

module.

An additional operational amplifier can supply

external components. The adjustable current

output stage permits 2- and 3-wire operation by

way of a simple amendment to the circuitry.

The IC is distinguished by its many protective

functions which include protection against

reverse polarity and short-circuiting and also an

internal current limit.

Reference Offset

GND

Prog. Reference

Output

VCC

Input

OP2

Voltage Reference

OP1

AM452

OP2

Differential

input

voltages

Offset

Amplifier

OP2 Output

V/I Converter

SET Stage

ZERO Stage

Figure 1: Schematic of AM452

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