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CA3290 データシート(PDF) 6 Page - Intersil Corporation

部品番号 CA3290
部品情報  BiMOS Dual Voltage Comparators with MOSFET Input, Bipolar Output
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メーカー  INTERSIL [Intersil Corporation]
ホームページ  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

CA3290 データシート(HTML) 6 Page - Intersil Corporation

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6
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.
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
A2
CA3290
7
6
5
3.3k
1M
+
-
A1
CA3290
1
8
4
+15V
2
3
15k
1M
+15V
20M
RP
1M
1M
+15V
0.36
µF
R2
1M
t
Period
10s
==
t2R
1Cloge
2R
P
R
2
------------
1
+



=
R1
C
FIGURE 6. LOW FREQUENCY MULTIVIBRATOR
+
-
A2
CA3290
+
-
A1 CA3290
1
7
8
4
670
3.9k
LED
2N2102
2
3
6
5
R3
VL
VU
100k
R1
100k
+15V
+15V
INPUT
47k
R2
47k
6.8k
FIGURE 7. WINDOW COMPARATOR
Typical Performance Curves
FIGURE 8. SUPPLY CURRENT vs SUPPLY VOLTAGE (BOTH
AMPLIFIERS)
FIGURE 9. INPUT CURRENT vs INPUT COMMON MODE
VOLTAGE
RL =
-55oC
125oC
25oC
TOTAL SUPPLY VOLTAGE (V)
0
5
10
15
20
25
30
35
40
45
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
TA = 25
oC
INPUT COMMON MODE VOLTAGE (V)
15
35
-15
-10
-5
0
V+ = +30V, V- = GND
-20
-25
-30
0
5
10
20
25
30
CA3290, CA3290A


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