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| 型號： | AM411 |
| 廠商： | MINI-CIRCUITS |
| 英文描述： | VOLTAGE TRANSMITTER IC |
| 中文描述： | 電壓發(fā)射器IC |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 79K |
| 代理商： | AM411 |
VOLTAGE TRANSMITTER IC
AM411
analog microelectronics
April 99
4/6
FUNCTIONAL DESCRIPTION
The IC AM411 is an integrated voltage transmitter for bridge input signals. With variations of a few
external components the output voltage can be adjusted over a wide range. In addition to the resis-
tors
R
1
and
R
2
the circuitry needs only one external capacitor
C
1
for a basic application. Using the
input of the voltage output stage the AM411 can be used for single ended input signals as well.
Typical values for the external components are listed in the
Application Notes
.
Basically the AM411 consists of 3 functional blocks as they are shown in Figure 1:
1.
A high accuracy
instrumentation amplifier
with an internal gain
G
IA
and the possibility to adjust
the bias voltage (pin
ZA
) for differential input signals.
2.
An
operational amplifier output stage
used for voltage transmission and as the voltage output.
The output stage has an output current limitation protecting the IC.
3.
A
voltage reference
can be used as an excitation for constant voltage sensors or as supply for
other external devices.
The transfer function for the output voltage of the instrumentation amplifier is:
ZA
IN
IA
OUTIA
V
V
V
G
+
=
with the offset voltage
V
ZA
which can be adjusted on pin
ZA
. For die entire output voltage
V
OUT
of
the IC is valid
INOP
OP
OUT
V
V
G
=
with the adjustable gain
G
OP
1
2
1
+
=
R
R
G
OP
The minimum supply voltage, which has to be adjusted, can be calculated over
V
S
≥
V
OUTmax
+ 5V
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