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參數(shù)資料
| 型號： | CAV414 |
| 廠商： | AME, 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)： | 5/6頁 |
| 文件大小： | 78K |
| 代理商： | CAV414 |
Converter IC for Capacitive Signals
CAV414
analog microelectronics
January 2001
5/6
FUNCTIONAL DESCRIPTION
A reference oscillator with a frequency adjusted by the capacity
C
OSC
drives two symmetrically built
integrators synchronously to its clock and its phase. The capacitors
C
X
1
and
C
X
2
determine the am-
plitude of the two driven integrators. The difference of the integrator amplitudes gives the relative
change of the capacities
C
X
1
and
C
X
2
to each other with high common mode rejection and high
resolution. The difference signal is conditioned by a lowpass filter. The corner frequency and gain
of it can be adjusted with a few external components. The output of the lowpass filter is connected
to an instrumentation amplifier and an output stage. These two stages transform the signal into an
adjustable voltage.
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).
Therefore one of this resistors is varied until the differential voltage
M
LPOUT
DIFF
V
V
V
=
is zero:
0
=
DIFF
V
Application Example:
The following values are given:
fixed capacitance
C
X
1
:
varying capacitance
C
X
2
:
50pF
50 ... 100pF
Calculation:
With the equations given in the boundary conditions, the following values for the devices can be
calculated:
C
OSC
:
C
L
1
:
C
L
2
:
80pF
10nF
10nF
If the signal
V
DIFF
is amplified, it has to fulfil the unequation:
V
DIFF
≤
400mV
Detailed calculations are shown in a separately available
Application Note
.
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