S1A0427B01 데이터 시트보기 (PDF) - Samsung

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S1A0427B01

AM/FM 1 CHIP RADIO

Samsung 

AM/FM 1 CHIP RADIO

S1A0427B01

APPLICATION INFORMATION

— EXTERNAL COMPONENTS

Part

Number

R5

R7

R8

C2

C4

C7

C9

C10

C11

C12

C13

C14

C15

C16

C17

Purpose

Am gain Control

FM detector

damper

FM gain adjust

IF bypass

IF filter

AM bypass

Detector filter

Audio coupling

Audio Input High-

cut

Ripple filter

Audio output

coupling

Power line filter

FM detector

phase-shift

High freq.

(IF) bypass

AN AGC time

constant and high

frequency (IF)

bypass

Typical

47kΩ

(33K − ∞ )

4.7kΩ

470Ω

0.022µF

0.022µF

0.047µF

0.01µF

0.022µF

0.001µF

220µF

470µF

470µF

10pF

0.047µF

0.047µF

Influence

Smaller Than Typ

Greater Than Typ

Low AM gain

AGC Distortion increase,

High gain

Low detector output, stable IF gain,

low FM gain

Sharp IF AMP curve

Low FM gain

High gain, but noise

increase

Should not be less than 0.005µF

High IF Gain,

S/N ratio degrade

Removal may cause IF oscillation No influence

Low gain

Using over 1 will cause

FM distortion at small

signal

Unstable IF AMP oscillation

Poor FM frequency

response

Lower sensitivity, poor low frequency Bass boost affects

response

de-emphasis curve

Audio oscillation

Poor response

Poor frequency response & Low gain Improve AC Hum

Poor low frequency response

Can achieve optimum

output power

Poor AC Hum

Improve AC Hum

Narrow IF bandwidth

Wide IF bandwidth

Removal will cause fm oscillation

No influence

Charging not recommended

−

5

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