LC7441N(2001) Ver la hoja de datos (PDF) - SANYO -> Panasonic

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LC7441N
(Rev.:2001)

Picture-in-picture Controller for TVs and VCRs

SANYO -> Panasonic 

LC7441N, 7441NE

On-chip D/A Converter

The normal D/A converter clock frequencies and the

clock frequencies when the RAR(Revise Aspect Ratio)

Table 1. D/A converter clock frequency

System

NTSC (fH = 15,734 Hz)

PAL (fH = 15,625 Hz)

Y (fCY = 480fH)

7.552

7.500

register is HIGH are shown in tables 1 and 2, respec-

tively.

Clock frequency (MHz)

R – Y (fCR = 240fH)

3.776

3.750

B – Y (fCB = 240fH)

3.776

3.750

Table 2. Changing clock frequency with RAR

RAR register

LOW

HIGH

HIGH

NTSC/PAL Input

×

LOW

HIGH

Note

× = don’t care

Y

480fH

416fH

565fH

R–Y

240fH

208fH

283fH

B–Y

240fH

208fH

283fH

CLAMPDA is HIGH during main-screen horizontal sync

pulses, as shown in the following figure.

The D/A converter data when the sub-screen is not

displayed are shown, msb first, in the following table.

Note that when TV/VCR is HIGH, the Y signal is output

as –Y, and when LOW, as Y.

Output

YAOUT

RAOUT

BAOUT

D/A converter data

TV/VCR is HIGH

TV/VCR is LOW

111111

000000

100000

100000

100000

100000

Dual-function Inputs

Input logic levels select sub-screen display parameters

when SER/PIN is LOW, and serial data and input logic

levels, when SER/PIN is HIGH, as shown in the follow-

ing table.

Pin

SCK/FVP

SD/FHP

SDE/STL

KDIS

WK

SER/PIN

LOW

HIGH

Sub-screen vertical

position select

Serial data clock

Sub-screen horizontal

position select

Serial data

Still/active display select Serial data enable

Initial sub-screen ON/OFF

Sub-screen ON/OFF select selection when controller is

reset

Sub-screen frame ON/OFF

select

Initial sub-screen frame

ON/OFF selection when

controller is reset

No.3941–11/20

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