LM2901VN 데이터 시트보기 (PDF) - Motorola => Freescale
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LM2901VN Datasheet PDF : 6 Pages
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LM339, LM339A, LM239, LM239A, LM2901, M2901V, MC3302
Figure 7. Driving Logic
VCC
Vin
RS
+
RL
Vref
–
R1
] RS = Source Resistance
R1 RS
Logic
VCC RL
Device
(V)
kΩ
CMOS 1/4 MC14001 +15 100
TTL 1/4 MC7400 +5.0 10
Figure 8. Squarewave Oscillator
VCC ≥ 4.0 V
100 k
R1
+
–
C
+
R2
VCC
330 k
R3
330 k
R4 330 k
10 k
VO
VCC
T1
T2
T1 = T2 = 0.69 RC
[ 7.2
f C(µF)
[ R2 = R3 = R4
R1 R2 // R3 // R4
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 kΩ 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)
+15 V
R1
R4
R5
8.2 k
Vin
D1
220 k
6.8 k
R2
220 k
*
)
10 k
VO
15 k
10 M
R3
D1 prevents input from going negative by more than 0.6 V.
R1 + R2 = R3
R3 ≤
R5
10
for small error in zero crossing
Figure 10. Zero Crossing Detector
(Split Supplies)
Vin(min) ≈ 0.4 V peak for 1% phase distortion (∆Θ).
Vin
Vin(min)
VCC
Θ
*
10 k
Vin
+
VO VCC
VO
Θ
VEE
VEE
∆Θ
4
MOTOROLA ANALOG IC DEVICE DATA
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