ICL8038CCPD Intersil, ICL8038CCPD Datasheet - Page 8

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ICL8038CCPD

Manufacturer Part Number
ICL8038CCPD
Description
IC OSCILL GEN/VOLT CONTROL 14DIP
Manufacturer
Intersil
Datasheet

Specifications of ICL8038CCPD

Rohs Status
RoHS non-compliant

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Use in Phase Locked Loops
Its high frequency stability makes the ICL8038 an ideal
building block for a phase locked loop as shown in Figure 9.
In this application the remaining functional blocks, the phase
detector and the amplifier, can be formed by a number of
available ICs (e.g., MC4344, NE562).
In order to match these building blocks to each other, two
steps must be taken. First, two different supply voltages are
used and the square wave output is returned to the supply of
the phase detector. This assures that the VCO input voltage
will not exceed the capabilities of the phase detector. If a
smaller VCO signal is required, a simple resistive voltage
divider is connected between pin 9 of the waveform
generator and the VCO input of the phase detector.
INPUT
V
1
+
-V
IN
1,000pF
HIGH FREQUENCY
-
+
741
OFFSET
10kΩ
+15V
DETECTOR
SYMMETRY
P
PHASE
4
1kΩ
FIGURE 9. WAVEFORM GENERATOR USED AS STABLE VCO IN A PHASE-LOCKED LOOP
1N753A
(6.2V)
VCO
IN
1kΩ
8
8
FIGURE 10. LINEAR VOLTAGE CONTROLLED OSCILLATOR
AMPLIFIER
10
4
FUNCTION GENERATOR
4.7kΩ
3,900pF
500Ω
ICL8038
11
5
DEMODULATED
4.7kΩ
ICL8038
R
LOW PASS
12
2
FILTER
6
FM
100kΩ
1MΩ
9
3
2
SQUARE
SINE WAVE
DISTORTION
FM BIAS
R
1
WAVE
50μF
15V
Second, the DC output level of the amplifier must be made
compatible to the DC level required at the FM input of the
waveform generator (pin 8, 0.8V+). The simplest solution here
is to provide a voltage divider to V+ (R
amplifier has a lower output level, or to ground if its level is
higher. The divider can be made part of the low-pass filter.
This application not only provides for a free-running
frequency with very low temperature drift, but is also has the
unique feature of producing a large reconstituted sinewave
signal with a frequency identical to that at the input.
For further information, see Intersil Application Note AN013,
“Everything You Always Wanted to Know About the ICL8038”.
OUT
10kΩ
+
7
9
8
4
10
FREQUENCY
100kΩ
TIMING
CAP.
ADJUST
CYCLE
DUTY
ICL8038
11
100kΩ
LOW FREQUENCY
SYMMETRY
5
-
+
741
+15V
12
6
SINE WAVE
ADJ.
3
2
1
-15V
1
, R
SINE WAVE
OUTPUT
SINE WAVE
2
TRIANGLE
V
SINE WAVE
ADJ.
V-/GND
as shown) if the
OUT
2
OUT
+

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