CA3290 데이터 시트보기 (PDF) - Intersil
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CA3290 Datasheet PDF : 10 Pages
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CA3290, CA3290A
constant to insure constant reverse voltage bias on the
photo diode.
R1 1.5MΩ
+15V
+15V
+15V
15kΩ
1MΩ
15 +15V
kΩ
8
1N914
60MΩ
3.3kΩ
1.0µF
R2
2MΩ
3
+
A1 CA3290
2-
140kΩ 5
+
1
+15V
A2 CA3290 7
6-
C30809 4
0.01µF
1N914
10kΩ
X 60s TIME
FIGURE 5. LIGHT CONTROLLED ONE-SHOT TIMER
Low-Frequency Multivibrator
In this application, one half of the CA3290 is used as a
conventional multivibrator circuit. Because of the extremely
high input impedance of this device, large values of timing
resistor (R1) may be used for long time delays with relatively
small leakage timing capacitors. The second half of the
CA3290 is used as an output buffer to insure that the
multivibrator frequency will not be affected by output loading.
RP is the parallel combination of the two 1MΩ resistors
connected between +15V and GND.
+15V
+15V
1MΩ
RP
+15V
R1
20MΩ
15kΩ
C
8
2-
A1
0.36
µF
CA3290
1
3
+
+15V
1MΩ
3.3kΩ
5+
A2
CA3290
7
6-
1MΩ
1MΩ
4
t = Period = 10s
R2
t
=
2
R1
C
loge
2----R-----P--
R2
+
1
1MΩ
FIGURE 6. LOW FREQUENCY MULTIVIBRATOR
Window Comparator
Both halves of the CA3290 can be used in a high input
impedance window comparator as shown in Figure 7. The
LED will be turned “on” whenever the input signal is above
the lower limit (VL) but below the upper limit (VU), as
determined by the R1/R2/R3 resistor divider.
+15V
+15V
INPUT
100kΩ
2
R1
47kΩ
VU
A1
3
8
-
CA3290
+
R2
47kΩ
R3
6.8kΩ
6
VL
100kΩ
A2
5
-
CA3290
+
4
3.9kΩ
1
7
LED
670Ω
2N2102
FIGURE 7. WINDOW COMPARATOR
6
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