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PDF ICL8038 Data sheet ( Hoja de datos )
| Número de pieza | ICL8038 | |
| Descripción | Precision Waveform Generator/ Voltage Controlled Oscillator | |
| Fabricantes | Harris Corporation | |
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SEMICONDUCTOR
ICL8038
November 1996
Precision Waveform Generator/
Voltage Controlled Oscillator
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
Description
The ICL8038 waveform generator is a monolithic integrated
circuit capable of producing high accuracy sine, square, tri-
angular, 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 modula-
tion and sweeping can be accomplished with an external
voltage. The ICL8038 is fabricated with advanced monolithic
technology, using Schottky barrier diodes and thin film resis-
tors, and the output is stable over a wide range of tempera-
ture and supply variations. These devices may be interfaced
with phase locked loop circuitry to reduce temperature drift
to less than 250ppm/oC.
Ordering Information
PART NUMBER
ICL8038CCPD
STABILITY
250ppm/oC (Typ)
ICL8038CCJD
250ppm/oC (Typ)
ICL8038BCJD
180ppm/oC (Typ)
ICL8038ACJD
ICL8038BMJD (Note)
ICL8038AMJD (Note)
120ppm/oC (Typ)
350ppm/oC (Max)
250ppm/oC (Max)
NOTE: Add /883B to part number if 883 processing is required.
TEMP. RANGE (oC)
0 to 70
0 to 70
0 to 70
0 to 70
-55 to 125
-55 to 125
PACKAGE
14 Ld PDIP
14 Ld CERDIP
14 Ld CERDIP
14 Ld CERDIP
14 Ld CERDIP
14 Ld CERDIP
PKG. NO.
E14.3
F14.3
F14.3
F14.3
F14.3
F14.3
Pinout
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
Functional Diagram
CURRENT
SOURCE
#1
I
10
2I
C
COMPARATOR
#1
COMPARATOR
#2
V+
6
CURRENT
SOURCE
#2
BUFFER
FLIP-FLOP
BUFFER
V- OR GND
11
SINE
CONVERTER
9 32
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © Harris Corporation 1996
8-153
File Number 2864.2
1 page  
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-----×-----10----./-23----2-×----×-V---V-S---S-U---U-P----PP---P-L---YL---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----1B----P--/--3----L----VY------S---–-U---0P---.-2P---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 con-
venient. 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-----AR-----–B----R-----B--
or, if RA = RB = R
f = 0--R--.-3--C--3-- (for Figure 3A)
Neither time nor frequency are dependent on supply voltage,
even though none of the voltages are regulated inside the
integrated circuit. This is due to the fact that both currents
and thresholds are direct, linear functions of the supply volt-
age and thus their effects cancel.
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
1kΩ
RA RB
74
5
69
V+
RL
8 ICL8038 3
8 ICL8038 3
10
C
11 12 2
82K
V- OR GND
10
C
11
12 2
100K
FIGURE 3A.
FIGURE 3B.
FIGURE 3. POSSIBLE CONNECTIONS FOR THE EXTERNAL TIMING RESISTORS
V- OR GND
8-157
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ICL8038.PDF ] | |
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