LM339QT Datasheet, PDF (9/19 Pages) STMicroelectronics – Low-power quad voltage comparators

LM139, LM239, LM339
Typical applications
Figure 14. Time delay generator
V_{C C} = +15 V
10 kΩ 15 kΩ
200 kΩ
10 kΩ
V₃
10 MΩ
1/4
LM139
V_CC
0t
o
t
A
Input gating signal
V_CC
10 kΩ
V_(ref.)
V3
V_{C1 V2}
V1
0
t
t₀ t₁ t₂ t₃
t₄
1/4
LM139
51 kΩ
V_C1
10 kΩ
V₂
0.001 μF
10 MΩ
1/4
LM139
51 kΩ
V₁
51 kΩ
10 kΩ
10 MΩ
1/4
LM139
3 kΩ
V₀₃ ^VCC
t
o
t₃
3kΩ
V_O2 ^VCC
t
o
t
2
3 kΩ
V
O1
V_CC
tt
01
Figure 15. Low frequency op amp with offset
adjust
Offset adjust
5V
100 kΩ
R₂
R_S
R₁
e_l ~
1 MΩ
1 kΩ
1 MΩ
15 kΩ
1/ 4
LM139
0.5 μ F
R1
100 kΩ
5V
2N 2222
e_o
Figure 16. Zero crossing detector (single
power supply)
5V
5.1 kΩ
e_l
100 kΩ
5.1 kΩ
1N4148
100 kΩ
1/ 4
LM139
5.1 kΩ
10 kΩ
20 MΩ
Figure 17. Two-decade high-frequency VCO
Frequency control
voltage input
Vcontrol
V_CC
100 kΩ
100 kΩ
0.1 μF
500 pF
1/ 4
LM139
3 kΩ
5.1 kΩ
0.01 μF
1/ 4
LM139
50 kΩ
20 kΩ
20 kΩ
V_CC /2
V_CC = + 30 V
+250 mV Vcontrol +50 V
700 Hz
fo 100 kHz
1/ 4
LM139
V_CC /2
V_CC
3 kΩ
Output 1
Output 2
Doc ID 2159 Rev 3
9/19