參數(shù)資料
型號： LM239MX
廠商： Fairchild Semiconductor Corporation
英文描述： Quad Comparator
中文描述： 四比較
文件頁數(shù)： 4/8頁
文件大?。?/td> 145K
代理商： LM239MX
LM339, LM339A, LM239, LM239A, LM2901, M2901V, MC3302
http://onsemi.com
4
Figure 7. Driving Logic
Figure 8. Squarewave Oscillator
Logic
Device
VCC
(V)
RL
k
CMOS
TTL
1/4 MC14001
1/4 MC7400
+15
+5.0
100
10
RS = Source Resistance
R1
RS
T1 = T2 = 0.69 RC
7.2
C(
μ
F)
f
R2 = R3 = R4
R1
R2 // R3 // R4
–
+
+
–
VCC
Vin
Vref
VCC
≥
4.0 V
VCC
+
C
330 k
R4
330 k
R3
R1
100 k
10 k
R1
T1
T2
VCC
VO
RS
RL
R2
330 k
APPLICATIONS INFORMATION
These quad comparators feature high gain, wide
bandwidth characteristics. This gives the device oscillation
tendencies if the outputs are capacitively coupled to the
inputs via stray capacitance. This oscillation manifests itself
during output transitions (VOL to VOH). To alleviate this
situation input resistors < 10 k
should be used. The
addition of positive feedback (< 10 mV) is also
recommended. It is good design practice to ground all
unused input pins.
Differential input voltages may be larger than supply
voltages without damaging the comparator’s inputs.
Voltages more negative than –300 mV should not be used.
Figure 9. Zero Crossing Detector
(Single Supply)
Figure 10. Zero Crossing Detector
(Split Supplies)
Vin(mn)
≈
0.4 V peak for 1% phase distortion (
Θ
).
D1 prevents input fromgoing negative by more than 0.6 V.
R1 + R2 = R3
R3
≤
10
Vin
10 k
D1
R1
8.2 k
6.8 k
R2
15 k
R3
+15 V
Θ
VCC
10 k
Vin
VEE
Vin
Vin(mn)
VCC
VO
VEE
Θ
Θ
10 M
R5
220 k
R4
220 k
VO
VO
+
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