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PDF L8038CCPD Data sheet ( Hoja de datos )
| Número de pieza | L8038CCPD | |
| Descripción | ICL8038 | |
| Fabricantes | ETC | |
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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
1 page  
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ICL8038
The levels of the current sources can, however, be selected
over a wide range with two external resistors. Therefore, with
the two currents set at values different from I and 2I, an
asymmetrical sawtooth appears at Terminal 3 and pulses
with a duty cycle from less than 1% to greater than 99% are
available at Terminal 9.
The sine wave is created by feeding the triangle wave into a
nonlinear network (sine converter). This network provides a
decreasing shunt impedance as the potential of the triangle
moves toward the two extremes.
Waveform Timing
The symmetry of all waveforms can be adjusted with the
external timing resistors. Two possible ways to accomplish
this are shown in Figure 3. Best results are obtained by
keeping the timing resistors RA and RB separate (A). RA
controls the rising portion of the triangle and sine wave and
the 1 state of the square wave.
The magnitude of the triangle waveform is set at 1/3
VSUPPLY; therefore the rising portion of the triangle is,
t1 = C------×-I----V-- = -C-----×-----1-0---/.--32---2--×---×-V----V-S---SU----U-P---P-P---PL----LY---Y--×-----R----A-- = -R---0-A--.--6-×--6---C---
The falling portion of the triangle and sine wave and the 0
state of the square wave is:
t2 = C------×1----V-- = -2---(--0---.-2---2---)---V------C-S--------U×----R----P--B1------P-/---3--L----V--Y----S---–-U----0P--.--P2--2-L---V-Y------S--------U----R----P--A------P------L------Y---- = -0--.--6--6---R(---2-A--R--R--A-B----–C----R----B---)-
Thus a 50% duty cycle is achieved when RA = RB.
If the duty cycle is to be varied over a small range about 50%
only, the connection shown in Figure 3B is slightly more
convenient. A 1kΩ potentiometer may not allow the duty cycle
to be adjusted through 50% on all devices. If a 50% duty cycle
is required, a 2kΩ or 5kΩ potentiometer should be used.
With two separate timing resistors, the frequency is given by:
f
=
t--1-----1+-----t-2--
=
--------------------------1----------------------------
R-0---.-A-6---C6---
1
+
2----R-----A-R----–B----R-----B--
or, if RA = RB = R
f = 0--R--.--3-C--3-- (for Figure 3A)
FIGURE 2A. SQUARE WAVE DUTY CYCLE - 50%
FIGURE 2B. SQUARE WAVE DUTY CYCLE - 80%
FIGURE 2. PHASE RELATIONSHIP OF WAVEFORMS
RA
74
RB
5
69
V+
RL
8 ICL8038 3
1kΩ
RA RB
74
5
69
V+
RL
8 ICL8038 3
10
C
11 12 2
10 11 12 2
82K
V- OR GND
C 100K
FIGURE 3A.
FIGURE 3B.
FIGURE 3. POSSIBLE CONNECTIONS FOR THE EXTERNAL TIMING RESISTORS
5
V- OR GND
5 Page 
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ICL8038
Dual-In-Line Plastic Packages (PDIP)
INDEX
AREA
N
12 3
-A-
BASE
PLANE
SEATING
PLANE
D1
B1
B
E1
N/2
-B-
D
-C- A2 A
L
D1
e
A1
eC
0.010 (0.25) M C A B S
E
CL
eA
C
eB
NOTES:
1. Controlling Dimensions: INCH. In case of conflict between English
and Metric dimensions, the inch dimensions control.
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of
Publication No. 95.
4. Dimensions A, A1 and L are measured with the package seated in
JEDEC seating plane gauge GS-3.
5. D, D1, and E1 dimensions do not include mold flash or protrusions.
Mold flash or protrusions shall not exceed 0.010 inch (0.25mm).
6. E and eA are measured with the leads constrained to be perpen-
dicular to datum -C- .
7. eB and eC are measured at the lead tips with the leads uncon-
strained. eC must be zero or greater.
8. B1 maximum dimensions do not include dambar protrusions. Dambar
protrusions shall not exceed 0.010 inch (0.25mm).
9. N is the maximum number of terminal positions.
10. Corner leads (1, N, N/2 and N/2 + 1) for E8.3, E16.3, E18.3, E28.3,
E42.6 will have a B1 dimension of 0.030 - 0.045 inch (0.76 -
1.14mm).
E14.3 (JEDEC MS-001-AA ISSUE D)
14 LEAD DUAL-IN-LINE PLASTIC PACKAGE
INCHES
MILLIMETERS
SYMBOL MIN MAX MIN MAX NOTES
A
-
0.210
-
5.33
4
A1
0.015
-
0.39
-
4
A2
0.115 0.195 2.93
4.95
-
B
0.014 0.022 0.356 0.558
-
B1
0.045 0.070 1.15
1.77
8
C
0.008 0.014 0.204 0.355
-
D
0.735 0.775 18.66 19.68
5
D1
0.005
-
0.13
-
5
E
0.300 0.325 7.62
8.25
6
E1
0.240 0.280 6.10
7.11
5
e 0.100 BSC 2.54 BSC -
eA 0.300 BSC
7.62 BSC
6
eB - 0.430 - 10.92 7
L
0.115 0.150 2.93
3.81
4
N 14
14 9
Rev. 0 12/93
11
11 Page | ||
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