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LM339 Datasheet(PDF) 4 Page - Motorola, Inc

Part No. LM339
Description  Quad Single Supply Comparators
Download  6 Pages
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Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
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LM339 Datasheet(HTML) 4 Page - Motorola, Inc

   
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LM339, LM339A, LM239, LM239A, LM2901, M2901V, MC3302
4
MOTOROLA ANALOG IC DEVICE DATA
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
f
[
7.2
C(
µF)
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
Ω 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.
10
Figure 9. Zero Crossing Detector
(Single Supply)
Figure 10. Zero Crossing Detector
(Split Supplies)
Vin(min) ≈ 0.4 V peak for 1% phase distortion (∆Θ).
D1 prevents input from going negative by more than 0.6 V.
R1 + R2 = R3
R3
R5
for small error in zero crossing
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(min)
VCC
VO
VEE
∆Θ
Θ
*
)
10 M
R5
220 k
R4
220 k
VO
VO
+


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