KA22427C データシートの表示（PDF） - Samsung

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KA22427C

AM/FM 1 CHIP RADIO

Samsung 

KA22427C

AM/FM 1 CHIP RADIO

APPLICATION INFORMATION

- EXTERNAL COMPONENTS

Parts

Number

R5

R7

Purpose

AM Gain

Control

FM Detector

Damper

Typical

47KΩ

(33K ~∞)

4.7KΩ

FM Gain

R8

Adjust

C2

IF Bypass

470

0.022µF

C4

IF Filter

0.022µF

C7

AM Bypass

Detector

C9

Filter

Audio

C10

Coupling

C11

Audio Input

High-Cut

Ripple Filter

C12

Audio Output

C13

Coupling

Power Line

C14

Filter

FM Detector

C15

Phase-Shift

High Freq.

C16

(IF) Bypass

AN AGC Time

Constant and

C17

High Frequency

(IF) Bypass

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 1µF Will

Cause FM

Distortion at Small

Signal

Unstable IF AMP

Oscillation

Poor FM Frequency

Response

Lower Sensitivity,

Poor Low Frequency

Response

Bass Boost

Affects De-emphasis

Curve

Audio Oscillation

Poor Response

Poor Frequency Response

& Low Gain

Poor Low Frequency

Response

Poor AC Hum

Improve AC Hum

Can Achieve Optimum

Output Power

Improve AC Hum

Narrow IF Bandwidth

Wide IF Bandwidth

Removal Will Cause

FM Oscillation

Not Recommend to

Charge

No Influence

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