CURRENT CONVERTER IC

AM402

analog microelectronics

April 99

Analog Microelectronics GmbH

Phone:

+49 (0)6131/91 073 – 0

1/8

An der Fahrt 13, D – 55124 Mainz

Fax:

+49 (0)6131/91 073 – 30

Rev. 2.1

Internet: www.analogmicro.de

E–Mail:

info@analogmicro.de

FEATURES

• Wide Supply Voltage Range: 6...35V

• Wide Operating Temperature Range:

–40°C...+85°C

• Adjustable Reference Voltage

Source: 4.5 to 10V

• Wide Common Mode Range Instru-

mentation Amplifier

• Adjustable Gain and Offset

• Two–Wire Output: 4...20mA

• Three–Wire Output: 0/4...20mA

• Adjustable Output Current Range

• Protection Against Reverse Polarity

• Current Shutdown with Overvoltage

• Shutdown with Excessive Tempera-

ture

APPLICATIONS

• Industrial Process Control

• Sensor Signal Converter (e.g. pressure)

• Programmable Current Source

GENERAL DESCRIPTION

AM402 is a monolithically integrated current

converter which has been specially developed

for the processing of differential bridge sig-

nals. AM402 is suitable for two- and three-

wire applications and has four function blocks.

A high-precision instrumentation amplifier

(IA) serves as an input stage. A reference volt-

age source, which can be adjusted to values of

between 4.5 and 10V, excites external compo-

nents and a voltage-controlled current output

stage converts the voltage signal. It is thus

possible to generate output currents which cor-

respond to the normal industrial standards

(0/4–20mA, 12

± 8mA).

DELIVERY

• DIL16 packages (samples)

• SO16(n) packages

• Dice on 5“ blue foil

BLOCK DIAGRAM

Reference Voltage

V

I

Instrumentation

Amplifier

SET

OUT

RS+

RS

−

VREF

VSET

GAIN

−

GAIN+

IN+

VCC

GAIN

GND

AM402

IN

−

9

8

10

11

12

13

16

1

2

3

5

7

14

Figure 1