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LR339 Datasheet(PDF) 3 Page - Leshan Radio Company

Part No. LR339
Description  Low Power Low Offset Voltage Quad Comparators
Download  6 Pages
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Manufacturer  LRC [Leshan Radio Company]
Direct Link  http://www.lrc.cn/
Logo LRC - Leshan Radio Company

LR339 Datasheet(HTML) 3 Page - Leshan Radio Company

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LESHAN RADIO COMPANY, LTD.
3/6
Figure 1. Inverting Comparator
with Hysteresis
Figure 2. Noninverting Comparator
with Hysteresis
Vref =
VCC R1
Rref + R1
R2
[ R1 / / Rref
Amount of Hysteresis VH
VH =
R2
R2 + R3
[(VO(max) − VO(min)]
Vref [
VCC R1
Rref + R1
R3
] R1 / / Rref / / R2
VH =
R1 / / Rref
R1/ / Rref + R2
[VO(max) − VO(min)]
R2
Rref / / R1
+ VCC
Vin
Vref
+ VCC
+ VCC
Vin
Vref
Rref
Rref
+
+
VO
VO
10k
R1
R2
R3
10 k
1.0 M
R3
R2
1.0 M
10 k
R1
10 k
10 k
Figure 3. Driving Logic
Figure 4. Squarewave Oscillator
Logic
Device
VCC
(V)
RL
k
W
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(
mF)
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
10
Figure 5. Zero Crossing Detector
(Single Supply)
Figure 6. Zero Crossing Detector
(Split Supplies)
Vin(min) ≈ 0.4 V peak for 1% phase distortion (Dq).
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
*
q
VCC
10 k
Vin
VEE
Vin
Vin(min)
VCC
VO
VEE
Dq
q
*
)
10 M
R5
220 k
R4
220 k
VO
VO
+
APPLICATION CIRCUIT
LR339


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