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Intersil
Intersil

ICL8038 Datasheet

Precision Waveform Generator/Voltage Controlled Oscillator


ICL8038 Datasheet Preview


Data Sheet
ICL8038
September 1998
File Number 2864.3
Precision Waveform Generator/Voltage
Controlled Oscillator
The ICL8038 waveform generator is a monolithic integrated
circuit capable of producing high accuracy sine, square,
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
modulation and sweeping can be accomplished with an
external voltage. The ICL8038 is fabricated with advanced
monolithic technology, using Schottky barrier diodes and thin
film resistors, and the output is stable over a wide range of
temperature 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
ICL8038CCJD
ICL8038BCJD
ICL8038ACJD
STABILITY
250ppm/oC (Typ)
250ppm/oC (Typ)
180ppm/oC (Typ)
120ppm/oC (Typ)
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
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 | Copyright © Intersil Corporation 1999
Page 1

ICL8038
Absolute Maximum Ratings
Supply Voltage (V- to V+). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36V
Input Voltage (Any Pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . V- to V+
Input Current (Pins 4 and 5). . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA
Output Sink Current (Pins 3 and 9) . . . . . . . . . . . . . . . . . . . . . 25mA
Operating Conditions
Temperature Range
ICL8038AC, ICL8038BC, ICL8038CC . . . . . . . . . . . . 0oC to 70oC
Thermal Information
Thermal Resistance (Typical, Note 1)
θJA (oC/W) θJC (oC/W)
CERDIP Package. . . . . . . . . . . . . . . . .
75
20
PDIP Package . . . . . . . . . . . . . . . . . . . 115
N/A
Maximum Junction Temperature (Ceramic Package) . . . . . . . .175oC
Maximum Junction Temperature (Plastic Package) . . . . . . . .150oC
Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC
Die Characteristics
Back Side Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V-
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1. θJA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
PARAMETER
VSUPPLY = ±10V or +20V, TA = 25oC, RL = 10k, Test Circuit Unless Otherwise Specified
SYMBOL
TEST
CONDITIONS
ICL8038CC
ICL8038BC
ICL8038AC
MIN TYP MAX MIN TYP MAX MIN TYP MAX
UNITS
Supply Voltage Operating Range
VSUPPLY
V+ Single Supply
+10 - +30 +10 - +30 +10 - +30
V
V+, V- Dual Supplies
±5 - ±15 ±5 - ±15 ±5 - ±15
V
Supply Current
ISUPPLY VSUPPLY = ±10V
(Note 2)
12 20 - 12 20 - 12 20
mA
FREQUENCY CHARACTERISTICS (All Waveforms)
Max. Frequency of Oscillation
Sweep Frequency of FM Input
Sweep FM Range
fMAX
fSWEEP
(Note 3)
100 -
- 100 -
- 100 -
-
- 10 -
- 10 -
- 10 -
- 35:1 -
- 35:1 -
- 35:1 -
kHz
kHz
FM Linearity
Frequency Drift with
Temperature (Note 5)
Frequency Drift with Supply Voltage
f/T
f/V
10:1 Ratio
0oC to 70oC
Over Supply
Voltage Range
- 0.5 -
- 250 -
- 0.05 -
- 0.2 -
- 180 -
- 0.05
- 0.2 -
- 120
- 0.05 -
%
ppm/oC
%/V
OUTPUT CHARACTERISTICS
Square Wave
Leakage Current
Saturation Voltage
Rise Time
Fall Time
Typical Duty Cycle Adjust
(Note 6)
IOLK
VSAT
tR
tF
D
V9 = 30V
ISINK = 2mA
RL = 4.7k
RL = 4.7k
- -1- -1- -1
- 0.2 0.5 - 0.2 0.4 - 0.2 0.4
- 180 -
- 180 -
- 180 -
- 40 -
- 40 -
- 40 -
2 98 2 - 98 2 - 98
µA
V
ns
ns
%
Triangle/Sawtooth/Ramp
Amplitude
Linearity
VTRIAN- RTRI = 100k
GLE
-
0.30 0.33 - 0.30 0.33 - 0.30 0.33 -
xVSUPPLY
- 0.1 -
- 0.05 -
- 0.05 -
%
Output Impedance
ZOUT IOUT = 5mA
- 200 -
- 200 -
- 200 -
2
Page 2

ICL8038
Electrical Specifications
PARAMETER
VSUPPLY = ±10V or +20V, TA = 25oC, RL = 10k, Test Circuit Unless Otherwise Specified (Continued)
SYMBOL
TEST
CONDITIONS
ICL8038CC
ICL8038BC
ICL8038AC
MIN TYP MAX MIN TYP MAX MIN TYP MAX
UNITS
Sine Wave
Amplitude
THD
VSINE
THD
RSINE = 100k
RS = 1M
(Note 4)
0.2 0.22
- 2.0
-
5
0.2 0.22
- 1.5
-
3
0.2 0.22 -
- 1.0 1.5
xVSUPPLY
%
THD Adjusted
THD Use Figure 4
- 1.5 -
- 1.0 -
- 0.8 -
%
NOTES:
2. RA and RB currents not included.
3. VSUPPLY = 20V; RA and RB = 10k, f 10kHz nominal; can be extended 1000 to 1. See Figures 5A and 5B.
4. 82kconnected between pins 11 and 12, Triangle Duty Cycle set at 50%. (Use RA and RB.)
5. Figure 1, pins 7 and 8 connected, VSUPPLY = ±10V. See Typical Curves for T.C. vs VSUPPLY.
6. Not tested, typical value for design purposes only.
Test Conditions
Supply Current
PARAMETER
RA
10k
RB
10k
RL
10k
C
3.3nF
SW1
Closed
MEASURE
Current Into Pin 6
Sweep FM Range (Note 7)
10k
10k
10k
3.3nF
Open Frequency at Pin 9
Frequency Drift with Temperature
10k
10k
10k
3.3nF
Closed Frequency at Pin 3
Frequency Drift with Supply Voltage (Note 8)
10k
10k
10k
3.3nF
Closed Frequency at Pin 9
Output Amplitude (Note 10)
Sine
10k
10k
10k
3.3nF
Closed Pk-Pk Output at Pin 2
Triangle
10k
10k
10k
3.3nF
Closed Pk-Pk Output at Pin 3
Leakage Current (Off) (Note 9)
10k
10k
3.3nF
Closed Current into Pin 9
Saturation Voltage (On) (Note 9)
10k
10k
3.3nF
Closed Output (Low) at Pin 9
Rise and Fall Times (Note 11)
10k
10k
4.7k
3.3nF
Closed Waveform at Pin 9
Duty Cycle Adjust (Note 11)
Max
50k~1.6k10k
3.3nF
Closed Waveform at Pin 9
Min
~25k
50k
10k
3.3nF
Closed Waveform at Pin 9
Triangle Waveform Linearity
10k
10k
10k
3.3nF
Closed Waveform at Pin 3
Total Harmonic Distortion
10k
10k
10k
3.3nF
Closed Waveform at Pin 2
NOTES:
7.
The hi and
Voltage at
lo frequencies can
pin 8 (2/3 VSUPPLY
be obtained by connecting pin 8 to pin 7 (fHI)
+2V) VSWEEP VSUPPLY where VSUPPLY
and then connecting pin 8
is the total supply voltage.
to
In
pin 6 (fLO).
Figure 5B,
Otherwise apply
pin 8 should vary
Sweep
between
5.3V and 10V with respect to ground.
8. 10V V+ 30V, or ±5V VSUPPLY ≤ ±15V.
9. Oscillation can be halted by forcing pin 10 to +5V or -5V.
10. Output Amplitude is tested under static conditions by forcing pin 10 to 5V then to -5V.
11. Not tested; for design purposes only.
3
Page 3

ICL8038
Test Circuit
RA RB
10K 10K
74
SW1
N.C.
5
8 ICL8038
69
3
+10V
RL
10K
RTRI
10 11
C
3300pF
12 2
82K
FIGURE 1. TEST CIRCUIT
RSINE
-10V
Detailed Schematic
CURRENT SOURCES
6
V+
R1 8
11K
7
3R92KQ6
Q1
Q2
REXT B
5
REXT A
4 Q14
Q3
Q4 Q5
R41
4K
R8
5K
Q7
R46
40K
Q8
Q9 10
CEXT
R3
30K
Q30
Q31
Q32
Q33
Q10
Q11
Q12
Q13
R4 R5 R6
100 100 100
COMPARATOR
Q15 Q18
Q16Q17
R9
R7B R7A 5K
15K 10K
Q20 Q21
Q19 Q22
R10
5K
Q34
9
Q23
R13 R16
620 1.8K
Q24
R11
270
R12
2.7K
Q26
R14
27K
Q27Q28
R15
470
Q25 Q29
FLIP-FLOP
R43
27K
Q35 Q37 Q39
R17
4.7K
R18
4.7K
Q36 Q38
R41
27K
Q40 3 R44
1K
R42 BUFFER AMPLIFIER
27K 11
R32
5.2K
Q48 1
Q47
R19 Q46
800
R20
Q45
Q44
2.7K
R21
Q43
Q42
10K
Q41
R25
33K
R26
33K
R27
33K
R33
200
R34
375
R35
330
R45
33K
R36
1600
Q49
R22
10K
R23
2.7K
R24
800
2
R28
33K
Q50
Q51
R29
33K
Q52
Q53
R30
33K
Q54
Q55
R31
33K
R37
330
R38
375
R39
200
12
Q56
R40
5.6K
REXTC
82K
SINE CONVERTER
Application Information (See Functional Diagram)
An external capacitor C is charged and discharged by two
current sources. Current source #2 is switched on and off by a
flip-flop, while current source #1 is on continuously. Assuming
that the flip-flop is in a state such that current source #2 is off,
and the capacitor is charged with a current I, the voltage
across the capacitor rises linearly with time. When this voltage
reaches the level of comparator #1 (set at 2/3 of the supply
voltage), the flip-flop is triggered, changes states, and
releases current source #2. This current source normally
carries a current 2I, thus the capacitor is discharged with a
net-current I and the voltage across it drops linearly with time.
When it has reached the level of comparator #2 (set at 1/3 of
the supply voltage), the flip-flop is triggered into its original
state and the cycle starts again.
Four waveforms are readily obtainable from this basic
generator circuit. With the current sources set at I and 2I
respectively, the charge and discharge times are equal. Thus
a triangle waveform is created across the capacitor and the
flip-flop produces a square wave. Both waveforms are fed to
buffer stages and are available at pins 3 and 9.
4
Page 4
Part Number ICL8038
Manufactur Intersil
Description Precision Waveform Generator/Voltage Controlled Oscillator
Total Page 10 Pages
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