am452 AME, Inc., am452 Datasheet - Page 3

• Manufacturer Part Number: am452
• Description: Voltage-to-current Transducer Ic With A Differential Input - Analog Microelectronics
• Manufacturer: AME, Inc.

FEATURES
SCHEMATIC
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
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
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
Figure 1: Schematic of AM452
Differential
voltages
Figure 1: Block diagram of AM452
input
AM452 – Voltage-to-current transducer IC
Input
OP2
4
2
3
V
OP2 Output
BG
ZERO Stage
Offset
OP2
IA
13
Prog. Reference
®
applications
1
with a differential input
Amplifier
Voltage Reference
12
5
OP1
Reference Offset
15
16
7
V/I Converter
SET Stage
AM452
GENERAL DESCRIPTION
AM452 is an integrated transducer with an
adjustable current output which has been
specifically designed for the conditioning of
differential
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.
GND
14
10
11
9
8
VCC
Output
February 2008 - Rev 1.2 - Page 3/21
Phone: [phone]
Fax:
Internet:
Email: [e-mail]
input
+49 (0)6131/91 073-30
http://www.analogmicro.de
signals.
It
permits
the