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PDF ( 数据手册 , 数据表 ) BU1424K

零件编号 BU1424K
描述 NTSC / PAL digital RGB encoder
制造商 ROHM Semiconductor
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BU1424K 数据手册, 描述, 功能
Multimedia ICs
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NTSC / PAL digital RGB encoder
BU1424K
The BU1424K is an IC that converts digital RGB / YUV input to composite (NTSC / PAL / PAL60), luminance (Y),
and chrominance (C) signals, and outputs the results.
Applications
Video interfaces for VIDEO-CDs and CD-G decoders
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 chrominance
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.).
1







BU1424K pdf, 数据表
Multimedia ICs
Pin No.
Pin name I / O
27
VSY
I
29
PIXCLK
O
32 INT I
33
SLABEB
I
34
ADDH
I
35
Vref-C
I
Equivalent circuit
BU1424K
Function
Vertical synchronization signals
(VSYNC) are input (when SLABEB =
LOW) or output (when SLABEB =
HIGH) here.
The internal processing clock is divid-
ed in half and then output. Data is
read at the point at which the edge of
this clock changes. This can also be
used as the clock for the OSD IC.
This pin switches between interlace
(when HIGH) and non-interlace
(when LOW) modes. This pin is effec-
tive in both the VIDEO-CD and CD-G
modes.
This pin switches between the Master
(when HIGH) and Slave (when LOW)
modes. It is effective in the non-
interlace mode, and it switches bet-
ween – 0.5 lines (when LOW) and +
0.5 lines (when HIGH) for the number
of lines in an interlace field.
This is the reference voltage generator
circuit monitoring pin which deter-
mines the output amplitude (output cur-
rent for 1 LSB) of the DAC.
8







BU1424K equivalent, schematic
Multimedia ICs
BU1424K
6) Y filter
With the BU1424K, the frequency characteristic of Y,
which is mixed with the VOUT pin output, is set so that
it can be selected using the YFILON1 and 2 pins. A
through filter is normally used on the YOUT pin output,
so that it is not limited to this method.
Table 8: Frequency characteristic of the Y channel
YFILON2B
YFILON1B
HH
LH
HL
LL
Frequency characteristic of the Y channel
TRAP filter through
(same signal as YOUT pin output is mixed with VOUT)
chart1
chart2
chart3
10
5 180
0 135
– 5 90
– 10 45
– 15 0
– 20 – 45
– 25 – 90
– 30
– 135
– 35
– 40
100
1000
– 180
10000 20000
FREQUENCY (kHz) CONT (c), END (e), COPY (Shift + Prt Sc)
Gain-Phase Graphic
Fig.5 Chart1 (BCLK = 13.5MHz)
10
5 180
0 135
– 5 90
– 10 45
– 15 0
– 20 – 45
– 25 – 90
– 30
– 135
– 35
– 40
100
1000
– 180
10000 20000
FREQUENCY (kHz) CONT (c), END (e), COPY (Shift + Prt Sc)
Gain-Phase Graphic
Fig.7 Chart3 (BCLK = 14.318MHz)
16
10
5 180
0 135
– 5 90
– 10 45
– 15 0
– 20 – 45
– 25 – 90
– 30
– 135
– 35
– 40
100
1000
– 180
10000 20000
FREQUENCY (kHz) CONT (c), END (e), COPY (Shift + Prt Sc)
Gain-Phase Graphic
Fig.6 Chart2 (BCLK = 13.5MHz)










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