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ICL8038
V+
V+
SWEEP
VOLTAGE
R A
R B
R L
R A
R B
15K
4
5
6
9
7
4
5
9
8
10
ICL8038
11
3
12 2
8
11
ICL8038
10
2
1N914
1N914
C
81K
C
2N4392
STROBE
V- OR GND
FIGURE 5B. CONNECTIONS FOR FREQUENCY SWEEP
FIGURE 5.
-15V
100K
OFF
ON
+15V (+10V)
-15V (-10V)
FIGURE 7. STROBE TONE BURST GENERATOR
Typical Applications
The sine wave output has a relatively high output impedance
(1k Ω Typ). The circuit of Figure 6 provides buffering, gain
and amplitude adjustment. A simple op amp follower could
also be used.
To obtain a 1000:1 Sweep Range on the ICL8038 the
voltage across external resistors R A and R B must decrease
to nearly zero. This requires that the highest voltage on
control Pin 8 exceed the voltage at the top of R A and R B by
a few hundred mV. The Circuit of Figure 8 achieves this by
R A
R B
V+
using a diode to lower the effective supply voltage on the
ICL8038. The large resistor on pin 5 helps reduce duty cycle
variations with sweep.
7
8
4
5
ICL8038
6
2
AMPLITUDE
100K
+
741
-
20K
The linearity of input sweep voltage versus output frequency
can be significantly improved by using an op amp as shown
in Figure 10.
+10V
1N457
10
11
4.7K
DUTY CYCLE
C
V-
0.1 μ F
1K
4.7K
4.7K
15K
FIGURE 6. SINE WAVE OUTPUT BUFFER AMPLIFIERS
5
4
6
9
With a dual supply voltage the external capacitor on Pin 10 can
be shorted to ground to halt the ICL8038 oscillation. Figure 7
10K
FREQ.
8
ICL8038
3
shows a FET switch, diode ANDed with an input strobe signal
to allow the output to always start on the same slope.
20K
≈ 15M
10
0.0047 μ F
11
12 2
DISTORTION
100K
-10V
FIGURE 8. VARIABLE AUDIO OSCILLATOR, 20Hz TO 20kHzY
7
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