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| 型號(hào)： | AM457 |
| 廠商： | AME, Inc. |
| 英文描述： | Precision amplifier for bridge circuits |
| 中文描述： | 精密放大器電路的橋梁 |
| 文件頁(yè)數(shù)： | 3/10頁(yè) |
| 文件大小： | 271K |
| 代理商： | AM457 |
Precision amplifier for bridge circuits
AM457
analog microelectronics
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: www.analogmicro.de
May 2005
Phone: +49 (0)6131/91 073 – 0
Fax:
+49 (0)6131/91 073 – 30
Email:
info@analogmicro
.
de
3/10
Rev. 2.2
FEATURES
High input sensitivity
Wide differential input voltage range
(
±
5...
±
100mV FS)
Low offset
Low offset drift
Low input noise
High CMRR: > 120dB
Wide operating temperature range:
-40... +125°C
Adjustable output voltage
Rail-to-rail output stage:
V
OUT
= 0.2V ...
V
cc
– 0.2V
Sink/source output
Single ratiometric supply:
V
CC
= 5V
Integrated current source:
≤
2mA
Integrated diagnostic unit
Separate function groups
Integrated EMV protective circuitry
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
±
100mV FS). The chief component
of the IC is a highly accurate, low-noise amplifier
circuit (AMP). An additional integrated operational
amplifier (OP) can be used to supply a sensing
element with current or record temperature for sensor
bridges powered by voltage, for example. The entire
system (sensing element plus amplifier) is monitored
by the integrated diagnostic unit which logs any
sensing
element
errors
undervoltage,
AMP
overloads
temperature. The various function groups are not
mutually dependent on one another; the AMP can be
operated independently of the OP, for example. The
functionality of both component groups (AMP and
OP) is autonomous with regard to the diagnostic unit.
or
defects,
and
system
excessive
AM457 is a combination of high-impedance precision
amplifier, additional OP and extensive diagnostic unit,
enabling a self-monitoring sensor system to be
assembled using very few components.
BLOCK DIAGRAM
OP
AMP
Temp
V
CC
AM457
1
Diagnostic
unit
4
5
6
7
8
OUTOP
IN+
INOP
GND
OUT
DIAG
VCC
_
1k
9k
Figure 1:
Block diagram
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