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LM2903NG Datasheet(PDF) 5 Page - ON Semiconductor

Part No. LM2903NG
Description  Low Offset Voltage Dual Comparators
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LM2903NG Datasheet(HTML) 5 Page - ON Semiconductor

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LM393, LM393E, LM293, LM2903, LM2903E, LM2903V, NCV2903
www.onsemi.com
5
APPLICATIONS INFORMATION
These dual 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
W should be used.
The addition of positive feedback (< 10 mV) is also
recommended. It is good design practice to ground all
unused pins.
Differential input voltages may be larger than supply
voltage without damaging the comparator’s inputs. Voltages
more negative than −0.3 V should not be used.
Figure 8. Zero Crossing Detector
(Single Supply)
Figure 9. Zero Crossing Detector
(Split Supply)
Figure 10. Free−Running Square−Wave Oscillator
Figure 11. Time Delay Generator
Figure 12. Comparator with Hysteresis
10
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
10 m
R5
220 k
R4
220 k
LM393
Vin(min) [ 0.4 V peak for 1% phase distortion (DQ).
*
Q
+VCC
10 k
Vin
-VEE
Vin
Vin(min)
VCC
VO
- VEE
DQ
Q
LM393
-
+
LM393
51 k
51 k
51 k
RL
10 k
VCC
VCC
VCC
VO
VO
t
0
1.0 m
W
0.001
mF
-
+
LM393
VCC
VCC
VO
Vin
VO
+ Vref
Vref
Vref
0
0
0
VC
tO
t
``ON'' for t
­ tO + Dt
where:
Dt = RC n (
Vref
VCC
)
R
RL
VC
C
LM393
-
+
RS
VCC
RL
Vref
R1
R2
RS = R1 | | R2
Vth1 = Vref +
(VCC -Vref) R1
R1 + R2 + RL
Vth2 = Vref -
(Vref -VO Low) R1
R1 + R2
R1
t
+
-
LM393
)
*
)


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