AN5290 데이터 시트보기 (PDF) - Panasonic Corporation

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AN5290

Antenna diversity IC for on-vehicle TV

Panasonic Corporation 

ICs for TV

AN5290S

s Technical Information (continued)

2. Timing chart 2

• When PAL reception (in horizontal and vertical synchronization) antenna is selected.

Electric field judgment and antenna selection timing when the change over from ANT-1 to ANT-3 by the

antenna selection is done.

1H

2H

3H

4H

5H

6H

1st field video signal

Horizontal sync. signal

(pin 5)

VCO signal

(internal clock of IC)

Electric field judgment timing

(Internal clock of IC)

Noise detection output

signal (pin 20)

Noise detection hold

(pin 19)

ANT-1 output

(pin 16)

ANT-2 output

(pin 15)

ANT-3 output

(pin 14)

ANT-4 output

(pin 13)

Selected antenna

Output for N.C.

(pin 6)

10.667 µs

(Electric field judgment level)

5.333 µs

ANT- 1 2 3 4 21.333 µs

The antenna selection sequence is as follows:

ANT-1 ANT-2 ANT-3 ANT-4

5

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