Industrial V/I Converter and Protector IC

AM462

analog microelectronics

December2006

Analog Microelectronics GmbH

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

3/20

An der Fahrt 13, D – 55124 Mainz

Fax:

+49 (0)6131/91 073 – 30

Rev. 2.4

Internet: http://www.analogmicro.de

Email:

info@analogmicro.de

FEATURES

• Supply voltage: 6...35V

• Wide working temperature range:

–40°C...+85°C

• Adjustable integrated reference voltage

source: 4.5 to 10V

• Additional voltage/current source

• Adjustable amplification

• Adjustable offset

• Industrial current output (e.g.

0/4...20mA)

• Protection against reverse polarity

• Short-circuit protection

• Output current limitation

• Low-cost device: replaces a number of

discrete elements

• 2- and 3-wire operation

• Individually configurable function

modules

• RoHS compilant

GENERAL DESCRIPTION

AM462 is a universal V/I converter and

amplifier IC with a number of additional

functions. The IC basically consists of an

amplifier, whose gain can be set externally,

and an output stage which can convert voltage

signals referenced to ground to industrial

current signals. An additional reference

voltage source for the supply of external

components is also included in the device. A

further operational amplifier can be connected

up as a current source, voltage reference or

comparator.

One of the main features of the IC is its

integrated protective circuitry. The device is

protected against reverse polarity and has a

built-in output current limit. Converter IC

AM462 enables industrial current loop signals

(e.g. of 0/4–20mA) to be produced relatively

easily.

Using the Frame ASIC concept [1] the IC can

be connected up to a processor for signal

correction.

BLOCK DIAGRAM

Figure 1: Block diagram of AM462 (individually configurable function modules)

VREF

SET

OUTAD

INDAI

GND

VSET

INN

INP

IOUT

RS+

VCC

CVREF

CVSET

V

BG

4

3

14

11

10

8

16

V

I

13

15

Voltage Reference

1

6

OP1

5

2

AM462

OP2

RS-

9