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參數(shù)資料
| 型號： | TDA4780 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | RGB video processor with automatic cut-off control and gamma adjust |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件頁數(shù)： | 14/44頁 |
| 文件大小： | 321K |
| 代理商： | TDA4780 |
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1997 Feb 06
14
Philips Semiconductors
Preliminary specification
RGB video processor with automatic
cut-off control and gamma adjust
TDA4780
Note
1.
Matrix coefficients should be tested by comparing RGB output signals with a reference RGB colour bar, which is fed
in at (RGB)
1
or (RGB)
2
inputs. In the event of NMEN = 1 (NTSC) at minimum saturation the Y output and RGB output
signals are not identical to the Y input signal. PAL/SECAM signals are matrixed by the equation:
V
G
Y
=
0.51V
R
Y
0.19V
B
Y
NTSC signals are matrixed by the equations (hue phase shift of
2 degrees):
V
R
Y*
= 1.39V
R
Y
0.07V
B
Y
; V
G
Y*
=
0.46V
R
Y
0.15V
B
Y
; V
B
Y*
= V
B
Y
For demodulation axis see Fig.11.
In the matrix equations: V
R
Y
and V
B
Y
are conventional PAL demodulation axes and amplitudes at the output of
the demodulator. V
R
Y*
, V
G
Y*
and V
B
Y*
are the NTSC-modified colour-difference signals.
Fig.7 Cut-off measurement pulses.
handbook, full pagewidth
MGE878
maximum brightness
nominal brightness
ultra-black
cut-off measurement line
for green signal
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