ICL8038 データシートの表示（PDF） - Harris Semiconductor
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ICL8038 Datasheet PDF : 10 Pages
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ICL8038
Test Circuit
RA
RB
10K
10K
74
5
SW1
N.C.
8
ICL8038
69
3
+10V
RL
10K
RTRI
10
11
C
3300pF
12 2
82K
FIGURE 1. TEST CIRCUIT
RSINE
-10V
Detailed Schematic
CURRENT SOURCES
6
V+
R1 8
11K
7
R392KQ6
Q1
Q2
REXT B
5
REXT A
4
Q14
Q3
Q4
Q5
R41
4K
R8
5K
Q7
Q8
R46
40K
Q9 10
CEXT
R3
30K
Q30
Q31
Q32
Q33
Q10
Q11
Q12
Q13
R4
R5 R6
100
100 100
COMPARATOR
Q15
Q18
Q16Q17
R9
R7B
R7A 5K
15K
10K
Q20 Q21
Q19
Q22
R10
5K
Q34
9
Q23
R13 R16
620 1.8K
Q24
R11
270
Q26
R14
27K
Q27Q28
R12
R15
2.7K
470
Q25
Q29
FLIP-FLOP
R43
27K
Q35
Q37
Q39
R17
4.7K
R18
4.7K
Q36 Q38
R41
27K
Q40 3 R44
1K
R42 BUFFER AMPLIFIER
27K
11
R32
5.2K
Q48
1
Q47
R19
Q46
800
R20
Q45
Q44
2.7K
R21
Q43
Q42
10K
Q41
R25
R26
R27
33K
33K
33K
R33
200
R34
375
R35
330
R45
33K
R36
1600
Q49
R22
10K
R23
2.7K
R24
800
2
R28
33K
Q50
Q51
R29
33K
Q52
Q53
R30
33K
Q54
Q55
R31
33K
R37
330
R38
375
R39
200
12
Q56
R40
5.6K
REXTC
82K
SINE CONVERTER
Application Information (See Functional Diagram)
An external capacitor C is charged and discharged by two cur-
rent 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 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 gener-
ator circuit. With the current sources set at I and 2I respec-
tively, 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.
8-156
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