Precision amplifier for bridge circuits
AM467
FEATURES
•
Wide differential input voltage range
(±5 mV FS...±100 mV FS)
•
Low offset
•
Low offset drift
•
Low input noise
•
High CMRR: > 120 dB
•
Wide operating temperature range:
– 40 °C... +125 °C
•
Adjustable output voltage
•
Rail-to-rail output stage:
V
OUT
= 0.2 V ...
V
CC
– 0.2 V
•
Sink/source output
•
Single ratiometric supply:
V
CC
= 5 V
•
Integrated EMV protective functions
•
Overvoltage protection 12 V
•
Integrated ESD protective functions
•
Short-circuit-proofing
•
Small-scale design
GENERAL DESCRIPTION
AM457 is a high-precision integrated amplifier
which has been developed to condition signals
from small differential input voltages within a
range of a few millivolts (±5 to
±100
mV FS).
The chief component of the IC is a highly
accurate, low-noise amplifier circuit which can
be adjusted to the sensing elements using an
external network of resistors.
With the exception of the additional operational
amplifier and the diagnostic unit IC AM467's
pins and functions are compatible with the
AM457.
The rail-to-rail output makes the IC suitable for
the amplification of DMS and piezoceramic
sensing elements and GMR measuring cells with
respect to the specific calibration network.
BLOCK DIAGRAM
VCC
8
AM467
IN-
2
IN+
3
Input-
amplifier
Output
stage
1
OUT
Biasing
Unit
Short circuit
protection
Current limitation
4
GND
Figure 1:
Block diagram for AM467
analog microelectronics
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: http://www.analogmicro.de
Phone:
Fax:
Email:
+49 (0)6131/91 073 – 0
+49 (0)6131/91 073 – 30
info@analogmicro.de
February 2007
3/9
Rev. 1.0
AME [ ANALOG MICROELECTRONICS ]
