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.
θ
JA
is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
V
SUPPLY
=
±10V
or +20V, T
A
= 25
o
C, R
L
= 10kΩ, Test Circuit Unless Otherwise Specified
TEST
CONDITIONS
ICL8038CC
MIN
TYP MAX
ICL8038BC(BM)
MIN
TYP MAX
ICL8038AC(AM)
MIN
TYP MAX
UNITS
PARAMETER
SYMBOL
Supply Voltage Operating Range
V
SUPPLY
V+
V+, V-
Single Suppl
y
+10
±5
-
-
+30
±15
+10
±5
-
-
+30
±15
+10
±5
-
-
+30
±5
V
V
Dual Supplies
V
SUPPLY
=
±10V
(Note 2)
Supply Current
8038AM 8038BM
8038AC, 8038BC, 8038CC
I
SUPPLY
-
-
12
20
-
-
12
12
15
20
-
-
12
12
15
20
mA
mA
FREQUENCY CHARACTERISTICS
(All Waveforms)
Max. Frequency of Oscillation
Sweep Frequency of FM Input
Sweep FM Range
FM Linearity
Frequency Drift with
Temperature (Note 5)
8038AC, 8038BC, 8038CC
8038AM, 8038BM
Frequency Drift with Supply Volt-
age
OUTPUT CHARACTERISTICS
Square Wave
Leakage Current
Saturation Voltage
Rise Time
Fall Time
Typical Duty Cycle Adjust
(Note 6)
Triangle/Sawtooth/Ramp
Amplitude
Linearity
V
TRIAN-
GLE
f
MAX
f
SWEEP
(Note 3)
10:1 Ratio
∆f/∆T
0
o
C to 70
o
C
-55
o
C to 125
o
C
∆f/∆V
Over Supply
Voltage Range
100
-
-
-
-
10
35:1
0.5
-
-
-
-
100
-
-
-
-
10
35:1
0.2
-
-
-
-
100
-
-
-
-
10
35:1
0.2
-
-
-
-
kHz
kHz
%
-
-
-
250
-
-
-
-
-
180
-
0.05
-
350
-
-
-
120
-
0.05
250
-
ppm/
o
C
ppm/
o
C
%/V
0.05
-
-
I
OLK
V
SAT
t
R
t
F
∆D
V
9
= 30V
I
SINK
= 2mA
R
L
= 4.7kΩ
R
L
= 4.7kΩ
-
-
-
-
2
-
0.2
180
40
1
0.5
-
-
98
-
-
-
-
2
-
0.2
180
40
-
1
0.4
-
-
98
-
-
-
-
2
-
0.2
180
40
-
1
0.4
-
-
98
µA
V
ns
ns
%
-
R
TRI
= 100kΩ
0.30 0.33
-
0.1
-
-
0.30 0.33
-
0.05
-
-
0.30 0.33
-
0.05
-
-
xV
SUPPLY
%
8-154
ICL8038
Electrical Specifications
V
SUPPLY
=
±10V
or +20V, T
A
= 25
o
C, R
L
= 10kΩ, Test Circuit Unless Otherwise Specified
(Continued)
TEST
CONDITIONS
ICL8038CC
MIN
TYP MAX
ICL8038BC(BM)
MIN
TYP MAX
ICL8038AC(AM)
MIN
TYP MAX
UNITS
PARAMETER
SYMBOL
Output Impedance
Sine Wave
Amplitude
THD
THD Adjusted
NOTES:
2. R
A
and R
B
currents not included.
Z
OUT
V
SINE
THD
THD
I
OUT
= 5mA
R
SINE
= 100kΩ
R
S
= 1MΩ
(Note 4)
Use Figure 4
-
200
-
-
200
-
-
200
-
Ω
0.2
-
-
0.22
2.0
1.5
-
5
-
0.2
-
-
0.22
1.5
1.0
-
3
-
0.2
-
-
0.22
1.0
0.8
-
1.5
-
xV
SUPPLY
%
%
3. V
SUPPLY
= 20V; R
A
and R
B
= 10kΩ, f
≅
10kHz nominal; can be extended 1000 to 1. See Figures 5A and 5B.
4. 82kΩ connected between pins 11 and 12, Triangle Duty Cycle set at 50%. (Use R
A
and R
B
.)
5. Figure 1, pins 7 and 8 connected, V
SUPPLY
=
±10V.
See Typical Curves for T.C. vs V
SUPPLY
.
6. Not tested, typical value for design purposes only.
Test Conditions
PARAMETER
Supply Current
Sweep FM Range (Note 7)
Frequency Drift with Temperature
Frequency Drift with Supply Voltage (Note 8)
Output Amplitude (Note 10)
Sine
Triangle
Leakage Current (Off) (Note 9)
Saturation Voltage (On) (Note 9)
Rise and Fall Times (Note 11)
Duty Cycle Adjust (Note 11)
Max
Min
Triangle Waveform Linearity
Total Harmonic Distortion
50kΩ
~25kΩ
10kΩ
10kΩ
~1.6kΩ
50kΩ
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
3.3nF
3.3nF
3.3nF
3.3nF
Closed
Closed
Closed
Closed
Waveform at Pin 9
Waveform at Pin 9
Waveform at Pin 3
Waveform at Pin 2
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
4.7kΩ
10kΩ
10kΩ
3.3nF
3.3nF
3.3nF
3.3nF
3.3nF
Closed
Closed
Closed
Closed
Closed
Pk-Pk Output at Pin 2
Pk-Pk Output at Pin 3
Current into Pin 9
Output (Low) at Pin 9
Waveform at Pin 9
R
A
10kΩ
10kΩ
10kΩ
10kΩ
R
B
10kΩ
10kΩ
10kΩ
10kΩ
R
L
10kΩ
10kΩ
10kΩ
10kΩ
C
3.3nF
3.3nF
3.3nF
3.3nF
SW
1
Closed
Open
Closed
Closed
MEASURE
Current Into Pin 6
Frequency at Pin 9
Frequency at Pin 3
Frequency at Pin 9
NOTES:
7. The hi and lo frequencies can be obtained by connecting pin 8 to pin 7 (f
HI
) and then connecting pin 8 to pin 6 (f
LO
). Otherwise apply
Sweep Voltage at pin 8 (
2
/
3
V
SUPPLY
+2V)
≤
V
SWEEP
≤
V
SUPPLY
where V
SUPPLY
is the total supply voltage. In Figure 5B, pin 8 should
vary between 5.3V and 10V with respect to ground.
8. 10V
≤
V+
≤
30V, or
±5V ≤
V
SUPPLY
≤ ±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.
8-155
ICL8038
Test Circuit
+10V
R
A
10K
7
SW
1
N.C.
8
ICL8038
3
R
TRI
10
C
3300pF
11
12 2
82K
R
SINE
-10V
4
5
R
B
10K
6
9
R
L
10K
FIGURE 1. TEST CIRCUIT
Detailed Schematic
CURRENT SOURCES
R
EXT
B
Q
1
Q
2
5
Q
3
Q
4
Q
7
R
46
40K
Q
10
R
3
30K
Q
30
Q
31
Q
32
Q
33
Q
34
Q
24
9
R
11
270
Q
23
R
12
2.7K
Q
25
R
13
620
R
16
1.8K
R
14
27K
Q
26
R
15
470
Q
29
Q
Q
27 28
R
17
4.7K
R
18
4.7K
FLIP-FLOP
Q
35
R
41
27K
Q
37
Q
36
Q
38
Q
40
R
43
27K
Q
39
3 R
44
1K
R
4
100
Q
11
Q
12
Q
13
R
5
100
R
6
100
Q
19
Q
5
COMPARATOR
Q
8
Q
9
10
Q
15
C
EXT
R
7B
15K
Q
20
Q
21
Q
22
R
10
5K
Q
49
R
22
10K
R
23
2.7K
R
24
800
R
28
33K
Q
50
Q
51
Q
52
Q
53
Q
54
Q
55
Q
56
R
42
BUFFER AMPLIFIER
27K
11
2
SINE CONVERTER
R
38
375
R
39
200
R
40
5.6K
R
37
330
R
29
33K
R
30
33K
R
31
33K
Q
16
Q
17
R
7A
10K
Q
18
R
9
5K
R
EXT
A
4
Q
14
R
8
5K
Q
47
Q
46
Q
45
Q
44
Q
43
Q
42
R
25
33K
R
26
33K
R
27
33K
R
45
33K
R
41
4K
Q
48
R
19
800
R
20
2.7K
R
21
10K
Q
41
R
33
200
R
34
375
R
35
330
6
V+
R
32
5.2K
1
R
1
8
11K
7
R
2
Q
39K
6
R
36
1600
12
R
EXT
C
82K
Application Information
(See Functional Diagram)
An external capacitor C is charged and discharged by two cur-
rent 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 gener-
ator circuit. With the current sources set at I and 2I respec-
tively, 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.
8-156
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 R
A
and R
B
separate (A). R
A
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
V
SUPPLY
; therefore the rising portion of the triangle is,
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