BU1425AK View Datasheet(PDF) - ROHM Semiconductor

Part Name

Description

Manufacturer

BU1425AK

NTSC / PAL digital RGB encoder

ROHM Semiconductor 

Multimedia ICs

2) Clock timing when the OSD function is used

Eight-color OSD color with a burster trimmer stacker fea-

ture can be used, simply by connecting an OSD with

external clock input. Output from the PIXCLK pin of the

BU1425AK should be input to the OSC-IN of the OSD IC.

The OSDSW input pin can be used as a signal for the

burster trimmer stacker feature called VBLK, or a similar

name. (See page 13 for a table showing the correspon-

dence between input data and color output.)

Internal clock (BCLK)

HSY (IN / OUT)

BU1425AK / BU1425AKV

PIXCLK

OSDSW

ROSD.GOSD

V.Y.C.OUT

VIDEO-DATA

BLACK YELLOW

Fig. 15 Clock timing with the OSD function

VIDEO-DATA

∗ The frequency of the PIXCLK pin output is one-half that of the internal clock. This phase is determined at the rising

edge of HSY, as shown in Fig.15. (In the Encoder Master mode, phase correction is implemented using the HSY

output of the BU1425AK itself.) The OSD function is effective only during the time that video output is enabled.

(See the TV signal timing diagram on page 27.)

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