MC3374FTB 데이터 시트보기 (PDF) - Motorola => Freescale

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MC3374FTB

Low Voltage FM Narrowband Receiver

Motorola => Freescale 

Freescale SeMmC3i3c7o4nductor, Inc.

Data Buffer Design

The data buffer is designed as follows:

fo = 200 Hz

C1 = C2 = 0.01 µF

Q = 0.707 (target)

K = 2.7 (data buffer open loop voltage gain)

Setting C1 = C2 yields:

+ Ǹ fo

1

2pC1 R1R2

Ǹ Ǹ + Q

1

R2

) R1

(2–K)

R1

R2

Iteration yields R2 = 4.2 (R1) to make Q = 0.707.

Substitution into the equation for fo yields:

R1 = 38 kΩ (use 39 kΩ)

R2 = 4.2(R1) = 180 kΩ

C1 = C2 = 0.01 µF

Audio Buffer Design

The audio buffer is designed as follows:

fo = 3000 Hz

R1 = R2 = 8.2 kΩ

Q = 0.707 (target)

K = 3.9 (audio buffer open loop voltage gain)

Setting C1 = C2 yields:

+ Ǹ fo

1

2pR1 C1C2

Ǹ Ǹ + Q

1

C2

) C1

(1–K)

C1

C2

Iteration yields C2 = 2.65 (C1) to make Q = 0.707.

Substitution into the equation for fo yields:

C1 = 3900 pF

C2 = 2.65(C1) = 0.01 µF

R1 = R2 = 8.2 kΩ

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