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ICL8038
Test Circuit
+10V
R A
10K
R B
10K
R L
10K
7
4
5
6
9
SW 1
N.C.
8
10
ICL8038
11
3
12 2
R TRI
C
3300pF
82K
R SINE
-10V
FIGURE 1. TEST CIRCUIT
Detailed Schematic
CURRENT SOURCES
6
V+
R 1
R 2
39K 6
7
8
11K
Q
Q 1
Q 2
R EXT B
5
Q 4
Q 3
R EXT A
4
Q 5
Q 14
R 41
4K
R 8
5K
R 19
Q 46
Q 47
Q 48
R 32
5.2K
R 33
200
1
Q 15
Q 16 Q 17
R 7B
R 7A
Q 19
R 3
30K
Q 31
Q 32
Q 33
Q 34
Q 30
Q 24
Q 7
R 46
40K
Q 8
Q 11
Q 12
R 4 R 5
100 100
R 13 R 16
620 1.8K
Q 9
Q 10
Q 13
R 6
100
10
C EXT
COMPARATOR
Q 18
R 9
5K
15K 10K
Q 20 Q 21
Q 22
R 10
5K
R 43
27K
800
R 20
2.7K
R 21
10K
Q 41
Q 49
R 22
10K
R 23
Q 42
Q 50
Q 43
R 25
33K
R 28
33K
Q 51
Q 44
Q 52
Q 45
R 26
33K
R 29
33K
R 27
33K
R 30
33K
R 45
33K
R 31
33K
R 34
375
R 35
330
R 36
1600
R 37
330
Q 27
R 42
27K
9
Q 23
R 11
270
R 12
2.7K
Q 25
Q 26
R 14
27K
R 15
470
Q 29
FLIP-FLOP
Q 28
Q 35
R 41
27K
R 17
4.7K
R 18
4.7K
Q 37 Q 39
Q 36 Q 38 Q 40
3 R 44
1K
BUFFER AMPLIFIER
11
2.7K
R 24
800
2
Q 53
Q 54
SINE CONVERTER
Q 55
Q 56
R 38
375
R 39
200
R 40
5.6K
12
R EXT C
82K
Application Information (See Functional Diagram)
An external capacitor C is charged and discharged by two
current sources. Current source #2 is switched on and off by a
flip-flop, while current source #1 is on continuously. Assuming
that the flip-flop is in a state such that current source #2 is off,
and the capacitor is charged with a current I, the voltage
across the capacitor rises linearly with time. When this voltage
reaches the level of comparator #1 (set at 2/3 of the supply
voltage), the flip-flop is triggered, changes states, and
releases current source #2. This current source normally
carries a current 2I, thus the capacitor is discharged with a
4
net-current I and the voltage across it drops linearly with time.
When it has reached the level of comparator #2 (set at 1/3 of
the supply voltage), the flip-flop is triggered into its original
state and the cycle starts again.
Four waveforms are readily obtainable from this basic
generator circuit. With the current sources set at I and 2I
respectively, the charge and discharge times are equal.
Thus a triangle waveform is created across the capacitor
and the flip-flop produces a square wave. Both waveforms
are fed to buffer stages and are available at pins 3 and 9.
发布紧急采购，3分钟左右您将得到回复。
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