TL080, TL081, TL082, TL084, TL081A, TL082A, TL084A
TL081B, TL082B, TL084B
JFET-INPUT OPERATIONAL AMPLIFIERS
SLOS081A–D2297, FEBRUARY 1977–REVISED NOVEMBER 1992
TYPICAL APPLICATION DATA
16 kΩ
16 kΩ
220 pF
43 kΩ
220 pF
30 kΩ
43 kΩ
30 kΩ
V
V
CC+
CC+
43 kΩ
Input
V
V
CC+
220 pF
220 pF
CC+
–
1/4
–
1/4
43 kΩ
43 kΩ
43 kΩ
–
1/4
–
TL084
TL084
Output
B
1/4
+
+
TL084
TL084
+
+
1.5 kΩ
1.5 kΩ
V
CC–
V
CC–
V
CC–
V
CC–
Output A
Output A
Output B
2 kHz/div
Second-Order Bandpass Filter
2 kHz/div
Cascaded Bandpass Filter
f = 100 kHz, Q = 69, GAIN = 16
o
f
o
= 100 kHz, Q = 30, GAIN = 4
Figure 28. Positive-Feedback Bandpass Filter
220 kΩ
0.00375 µF
10 kΩ
0.03 µF
0.003 µF
27 kΩ
MIN
MIN
0.01 µF
1 µF
V
V
CC+
CC+
100 kΩ
Treble
MAX
100 kΩ
Bass
MAX
–
–
10 kΩ 3.3 kΩ
0.003 µF
100 Ω
TL080
TL080
Output
+
+
0.03 µF
R
Input
ext
10 kΩ
V
V
CC–
10 pF
CC–
10 pF
47 kΩ
68 kΩ
100 Ω
Balance
75 µF
+
5 kΩ
Gain
50 pF
47 µF
+
Figure 29. IC Preamplifier
17
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77001
TI [ TEXAS INSTRUMENTS ]
