參數(shù)資料
型號(hào)： VT900
廠商： PerkinElmer Inc.
英文描述： Photoconductive Cells and Analog Optoisolators (Vactrols)
中文描述： 光導(dǎo)細(xì)胞和模擬光隔離器（Vactrols）
文件頁(yè)數(shù)： 71/76頁(yè)
文件大?。?/td> 1240K
代理商： VT900
66
Application Notes—Analog Optical Isolators
The control loop consists of op-amp A
2
and resistors R
1
and R
4
. This
circuit sets the LED current so that:
If we set:
and:
then:
or:
where
R
3
= R
4
R
1
= R
2
e
out
/ e
in
= V
REF
/ V
C
e
out
= e
in
(V
REF
/ V
C
)
V
C
= control voltage
Note that R
1
and R
2
are the two halves of the cell. These two resistors
match within 10% and track over a wide range within 5% so that the
gain is closely set by V
C
when V
REF
is fixed.
The limts of operation are:
0 < V
C
< V
REF
and the signal must never be so large that amplifier A
1
saturates when
the gain is at maximum
This circuit performs a dividing operation with e
in
and V
C
as the
numerator and denomnator respectively. The accuracy is limted by
the tracking ability of the two sides of the photocell. The error due to
matching can be elimnated by trimmng R
4
.
Figure 10. Electrically Programmable Gain
V
V
C
----------
R
----------------------
R
+
R
1
(
)
=
e
e
in
--------
V
V
C
----------
Gain
=
=
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