CURRENT CONVERTER IC
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
AM402
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
APPLICATIONS
•
Industrial Process Control
•
Sensor Signal Converter (e.g. pressure)
•
Programmable Current Source
•
DIL16 packages (samples)
•
SO16(n) packages
•
Dice on 5“ blue foil
BLOCK DIAGRAM
GAIN− GAIN GAIN+
10 11 12
VSET
13
VREF
16
AM402
Reference Voltage
1
2
3
9
IN+
8
IN−
14
GND
7
SET
Instrumentation
Amplifier
V
I
RS+
VCC
RS−
OUT
5
Figure 1
analog microelectronics
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: www.analogmicro.de
Phone: +49 (0)6131/91 073 – 0
Fax:
+49 (0)6131/91 073 – 30
E–Mail: info@analogmicro.de
April 99
1/8
Rev. 2.1
AME [ ANALOG MICROELECTRONICS ]
