LM2901D 查看數據表（PDF） - Motorola => Freescale

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LM2901D

Quad Single Supply Comparators

Motorola => Freescale 

LM339, LM339A, LM239, LM239A, LM2901, M2901V, MC3302

Figure 7. Driving Logic

VCC

Vin

RS

+

RL

Vref

–

R1

] RS = Source Resistance

R1 RS

Logic

VCC RL

Device

(V)

kΩ

CMOS 1/4 MC14001 +15 100

TTL 1/4 MC7400 +5.0 10

Figure 8. Squarewave Oscillator

VCC ≥ 4.0 V

100 k

R1

+

–

C

+

R2

VCC

330 k

R3

330 k

R4 330 k

10 k

VO

VCC

T1

T2

T1 = T2 = 0.69 RC

[ 7.2

f C(µF)

[ R2 = R3 = R4

R1 R2 // R3 // R4

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 kΩ 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.

Figure 9. Zero Crossing Detector

(Single Supply)

+15 V

R1

R4

R5

8.2 k

Vin

D1

220 k

6.8 k

R2

220 k

*

)

10 k

VO

15 k

10 M

R3

D1 prevents input from going negative by more than 0.6 V.

R1 + R2 = R3

R3 ≤

R5

10

for small error in zero crossing

Figure 10. Zero Crossing Detector

(Split Supplies)

Vin(min) ≈ 0.4 V peak for 1% phase distortion (∆Θ).

Vin

Vin(min)

VCC

Θ

*

10 k

Vin

+

VO VCC

VO

Θ

VEE

VEE

∆Θ

4

MOTOROLA ANALOG IC DEVICE DATA

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