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Multimedia ICs
NTSC / PAL digital RGB encoder
BU1425AK / BU1425AKV
The BU1425AK / BU1425AKV are ICs which convert digital RGB / YUV input to composite (NTSC / PAL / PAL60),
luminance (Y), and chrominance (C) signals, and outputs the results.
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Applications
Video interfaces for VIDEO-CDs and CD-G decoders
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Features
1) Input clocks supported
27.0 / 13.5MHz
28.636 / 14.318MHz
28.375 / 14.1875MHz
35.4695 / 17.73475MHz
2) 24-bit RGB and 16-bit YUV input signals are sup-
ported.
3) Both master and slave systems are supported.
4) 9-bit high-speed DAC is used for DAC output of
composite VIDEO, Y, and C signals.
5) Internal 8-color OSD output function is provided.
6) FSC-TRAP on the Y channel can be turned on and
off.
7) C channel is equipped with an internal chromi-
nance band-pass filter in addition to the U.V. low-
pass filter.
8) 5V single power supply, low power consumption
(0.4W typ.)
9) Y and C output can be turned off (the power con-
sumption with Y and C off is 0.25W typ.).
10) In the Master mode, applying 3.3V to the I / O V
DD
and 5.0V to other VDDs produces HSY and VSY
output with an amplitude of 3.3V. This enables
direct connection to LSIs that use a power supply
voltage of 3.3V. (The clock output for the OSD has
a fixed amplitude of 5.0V.)
11) In the Slave mode, applying voltage to the I / O V
DD
only, and applying 0V to other VDDs, enables a cur-
rent consumption of 0 even when RGB DATA,
HSY, VSY, and OSD DATA are in the active state.
