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PDF ( 数据手册 , 数据表 ) L8038CCPD

零件编号 L8038CCPD
描述 ICL8038
制造商 ETC
LOGO ETC LOGO 


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L8038CCPD 数据手册, 描述, 功能
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NOT
TM
RECOM
MENDED
FOR
Data Sheet
NEW
DESIGNS
ICL8038
April 2001
File Number 2864.4
Precision Waveform Generator/Voltage
Controlled Oscillator
The ICL8038 waveform generator is a monolithic integrated
tle circuit capable of producing high accuracy sine, square,
80 triangular, sawtooth and pulse waveforms with a minimum of
external components. The frequency (or repetition rate) can
- be selected externally from 0.001Hz to more than 300kHz
using either resistors or capacitors, and frequency
ci-
modulation and sweeping can be accomplished with an
external voltage. The ICL8038 is fabricated with advanced
monolithic technology, using Schottky barrier diodes and thin
e- film resistors, and the output is stable over a wide range of
temperature and supply variations. These devices may be
er- interfaced with phase locked loop circuitry to reduce
/Vo temperature drift to less than 250ppm/oC.
e
- Ordering Information
ed PART NUMBER
il-
r) ICL8038CCPD
STABILITY
250ppm/oC (Typ)
tho ICL8038CCJD
250ppm/oC (Typ)
ICL8038BCJD
-
ds ICL8038ACJD
r- Pinout
180ppm/oC (Typ)
120ppm/oC (Typ)
po-
n,
i-
or,
e-
ra-
-
ed
lla-
ICL8038
(PDIP, CERDIP)
TOP VIEW
SINE WAVE
ADJUST
1
SINE
WAVE OUT
2
TRIANGLE
OUT
3
DUTY CYCLE
FREQUENCY
ADJUST
4
5
V+ 6
FM BIAS 7
14 NC
13 NC
12 SINE WAVE
ADJUST
11 V- OR GND
10
TIMING
CAPACITOR
9 SQUARE
WAVE OUT
8 FM SWEEP
INPUT
i-
,
Features
• Low Frequency Drift with Temperature. . . . . . 250ppm/oC
• Low Distortion . . . . . . . . . . . . . . . 1% (Sine Wave Output)
• High Linearity . . . . . . . . . . . 0.1% (Triangle Wave Output)
• Wide Frequency Range . . . . . . . . . . . .0.001Hz to 300kHz
• Variable Duty Cycle . . . . . . . . . . . . . . . . . . . . . 2% to 98%
• High Level Outputs. . . . . . . . . . . . . . . . . . . . . . TTL to 28V
• Simultaneous Sine, Square, and Triangle Wave
Outputs
• Easy to Use - Just a Handful of External Components
Required
TEMP. RANGE (oC)
0 to 70
0 to 70
0 to 70
0 to 70
PACKAGE
14 Ld PDIP
14 Ld CERDIP
14 Ld CERDIP
14 Ld CERDIP
Functional Diagram
CURRENT
SOURCE
#1
I
10
2I
C
COMPARATOR
#1
COMPARATOR
#2
PKG. NO.
E14.3
F14.3
F14.3
F14.3
V+
6
CURRENT
SOURCE
#2
BUFFER
9
FLIP-FLOP
BUFFER
V- OR GND
11
SINE
CONVERTER
32
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil and Design is a trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2001, All Rights Reserved







L8038CCPD pdf, 数据表
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ICL8038
V1+
INPUT
VCO
IN
PHASE
DETECTOR
AMPLIFIER
R1
FM BIAS
DUTY
CYCLE
FREQUENCY
ADJUST
74 5
SQUARE
WAVE
OUT
9
ICL8038
DEMODULATED
FM
R2
LOW PASS
FILTER
8 10
11
TIMING
CAP.
V2+
63
2
TRIANGLE
OUT
SINE WAVE
OUT
12 1
SINE WAVE
ADJ.
SINE WAVE
ADJ.
V-/GND
FIGURE 9. WAVEFORM GENERATOR USED AS STABLE VCO IN A PHASE-LOCKED LOOP
HIGH FREQUENCY
SYMMETRY
1,000pF
1N753A
(6.2V)
1k
+15V
-
741
+
-VIN
P4
10k
OFFSET
1k
500
4.7k
4.7k
10k
1M
4 5 69
100k
ICL8038
8 FUNCTION GENERATOR 3
10 11
3,900pF
12 2
100k
+
50µF
15V
SINE WAVE
DISTORTION
100k
LOW FREQUENCY
SYMMETRY
+15V
-
741
+
SINE WAVE
OUTPUT
-15V
FIGURE 10. LINEAR VOLTAGE CONTROLLED OSCILLATOR
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.
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+ (R1, R2 as shown) if the
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”.
8














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