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參數(shù)資料
| 型號： | CAV424 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Converter IC for Capacitive Signals |
| 中文描述： | 轉(zhuǎn)換器集成電路電容信號 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 74K |
| 代理商： | CAV424 |
Converter IC for Capacitive Signals
CAV424
analog microelectronics
January 2002
6/7
It thus follows that the output signal of the low-pass stage is
M
DIFF
LPOUT
V
V
V
+
=
with
(
)
2
1
0
8
3
CX
CX
LP
DIFF
LP
DIFF
V
V
G
V
G
V
=
=
In order to reduce the number of external components needed for the sensor system a temperature
acquisition sensor was integrated. With the aid of a processor, this sensor can be used to compensate for
the temperature error of the entire sensor system, for example.
FUNCTIONAL DIAGRAM
VCC
C
L
1
C
L
2
C
OSC
C
X
1
C
X
2
CAV424
1
3
11
6
4
2
7
12
16
14
13
15
10
R
OSC
R
CX
2
R
CX
1
V
DIFF
5
GND
R
L
1
R
L
2
C
VM
Signal Conditioning
T
Sensor
Integrator 1
Integrator 2
Reference
Oscillator
Current Reference
Figure 4:
functional diagram CAV424
Adjustment:
The zero-adjustment is made by the resistors
R
CX
1
or
R
CX
2
for the case that the varying capacitance
C
X
2
has nearly the same (and its smallest) value as the fixed capacitance
C
X
1
(reference capacitance). There-
fore one of this resistors is varied until the differential voltage
M
LPOUT
DIFF
V
V
V
=
is zero:
0
=
DIFF
V
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