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參數(shù)資料
| 型號： | BH7240 |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | CANMS3476L12-3A |
| 中文描述： | 彩色電視信號編碼器 |
| 文件頁數(shù)： | 9/9頁 |
| 文件大?。?/td> | 92K |
| 代理商： | BH7240 |
9
Multimedia ICs
BH7240AKV
Circuit operation
(1) The DAC system clock is input to the VCLK pin.
RGB data is taken into the IC at the rising edge of this
clock.
0
1
2
3
4
5
RGBDATA
VCLK
0
1
2
3
4
5
Internal RGB
(2) The subcarrier is input to the SCIN pin. There is an
internal input capacitor in the IC, so no external DC
cutoff is necessary. Also, the input level supports a
range of 0.5 to 5V
p-p
. To avoid offset in the chromi-
nance phase, distortion-free sine waves or pulses with
a duty of 50% should be input in a range which does
not exceed the V
CC
and GND.
(3) Composite SYNC signals are input to SYNCIN.
When the input level is low, SYNC signals are output to
the composite output (V
OUT
) and luminance output
(Y
OUT
), and DC clamping of the RGB signals from the
DAC is carried out at this timing. To prevent erroneous
clamping, RGB data should be set to 00 input during
the SYNC interval.
(4) Burst timing and the chrominance phase reversal
timing when PAL is used are generated by SYNC sig-
nals and subcarriers. For this reason, signals input as
SYNC signals and subcarriers should be in confor-
mance with standards.
(5) The NT / PAL pin is used to select the video output
system. When the input level is high, NTSC is selected,
and when the input level is low, PAL is selected. When
PAL is selected, the chrominance phase is reversed
once every hour.
(6) A trap filter is connected to the YTRAP pin. This
eliminates the chrominance band component that
includes the luminance signal, and reduces cross-
color. This filter is effective only for composite output
(V
OUT
), and does not affect luminance output (Y
OUT
).
(7) Composite signals are output from the V
OUT
pin. An
internal 75
driver enables direct drive of the 75
load. (However, DC cutoff is required.)
(8) Luminance signals and chrominance signals are
output from the Y
OUT
and C
OUT
pins, respectively. An
internal 75
driver enables direct drive of the 75
load. (However, DC cutoff is required.)
(9) Analog RGB signals are output from R
OUT
, G
OUT
,
and B
OUT
. An internal 75
driver enables direct drive of
the 75
load. (However, DC cutoff is required.)
External dimensions (Units: mm)
VQFP48
0
0.125
±
0.1
0.10
0.2
±
0.1
9
±
7
±
9.0
±
0.3
7.0
±
0.2
48
37
1
12
13
24
25
36
0.5
1
±
0
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