LMV821 데이터 시트보기 (PDF) - ON Semiconductor

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LMV821

Single, Dual, Quad Low Voltage, Rail-to-Rail Operational Amplifiers

ON Semiconductor 

LMV821, LMV822, LMV824

APPLICATIONS INFORMATION

VCC

MC1403

R1

VCC

R2

−

LMV821

VO

+

2.5 V

VO

+

2.5

V(1

)

R1)

R2

Figure 14. Voltage Reference

50 k

Vref

Vref

+

1

2

VCC

5.0 k

10 k

−

VCC

LMV821

+

R

RC

C

VO

fO

+

1

2pRC

For: fo = 1.0 kHz

R = 16 kW

C = 0.01 mF

Figure 15. Wien Bridge Oscillator

R1

Vref

Vin

R2

Hysteresis

VOH

+

VO

LMV821

−

VO

VOL

VinL VinH

VinL

+

R1

R1 ) R2

VinH

+

R1

R1

)

R2

H + R1

R1 ) R2

Vref

(VOL * Vref) ) Vref

(VOH * Vref) ) Vref

(VOH * VOL)

Figure 16. Comparator with Hysteresis

VCC

R1

Vin

C

C

R3

−

LMV821

+

R2

Vref

CO

VO

CO = 10 C

Given: fo = center frequency

A(fo) = gain at center frequency

Choose

value

fo,

C

Q

Then : R3 +

pfO C

R1 + R3

2 A(fO)

R1 R3

R2 +

4Q2 R1 * R3

For less than 10% error from operational amplifier,

((QO fO)/BW) < 0.1 where fo and BW are expressed in Hz.

If source impedance varies, filter may be preceded with

voltage follower buffer to stabilize filter parameters.

Figure 17. Multiple Feedback Bandpass Filter

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