LR339 datasheet(3/6 Pages) LRC | Low Power Low Offset Voltage Quad Comparators

Part No.	LR339

Description	Low Power Low Offset Voltage Quad Comparators

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Manufacturer	LRC [Leshan Radio Company]

Direct Link	http://www.lrc.cn/

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3 / 6 page

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

Vin

Vref

Rref

−

+

−

+

VO

10k

R1

R2

R3

10 k

1.0 M

R3

R2

1.0 M

10 k

R1

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

+

APPLICATION CIRCUIT

LR339

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