KA9270 데이터 시트보기 (PDF) - Samsung

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KA9270

AUDIO FILTER

Samsung 

KA9270

AUDIO FILTER

APPLICATION INFORMATION

1. BUFFER

INPUT

+

(from D/A Converter

-

Output)

to De-emphasis input

Fig. 3

It is used for impedance matching, between D/A converter output and de-emphasis input.

2. DE-EMPHASIS

a) De-emphasis operation condition

Control Input

High

Low

De-emphasis Operation

ON

OFF

b) De-emphasis characteristic at the de-emphasis ON

R5

C1

R4

R6

Vi

-

Vo

+

Fig. 4 Equevalent Circuit of De-emphasis ON Mode

Av R4 / R6

T1 = C1 (R4 + R5)

T2 = C1 X R5

The de-emphasis charcteristics is dependent on the external parts value.

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