LM339, LM239, LM2901, LM2901V, NCV2901, MC3302
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 (V
OL
to V
OH
). To alleviate this
situation input resistors < 10 kW 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.
+15 V
R4
220 k
6.8 k
R2
R5
220 k
*
)
R1
8.2 k
V
in
D1
10 k
V
O
V
in(min)
≈
0.4 V peak for 1% phase distortion (Dq).
V
in
V
CC
V
in(min)
q
10 k
V
O
15 k
R3
10 M
*
V
in
D1 prevents input from going negative by more than 0.6 V.
R1 + R2 = R3
R3
≤
R5
for small error in zero crossing
10
+
V
EE
V
CC
V
O
V
EE
Dq
q
Figure 9. Zero Crossing Detector
(Single Supply)
Figure 10. Zero Crossing Detector
(Split Supplies)
ORDERING INFORMATION
Device
LM239D
LM239DG
LM239DR2
LM239DR2G
LM239DTBR2
LM239DTBR2G
LM239N
LM239NG
LM339D
LM339DG
LM339DR2
LM339DR2G
LM339DTBR2
LM339DTBR2G
Package
SOIC−14
SOIC−14
(Pb−Free)
SOIC−14
SOIC−14
(Pb−Free)
TSSOP−14*
TSSOP−14*
PDIP−14
PDIP−14
(Pb−Free)
SOIC−14
SOIC−14
(Pb−Free)
SOIC−14
SOIC−14
(Pb−Free)
TSSOP−14*
TSSOP−14*
2500 / Tape & Reel
55 Units/Tube
25 Units/Rail
2500 / Tape & Reel
55 Units/Tube
Shipping
†
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*This package is inherently Pb−Free.
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