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TDA4780 Datasheet(PDF) 14 Page - NXP Semiconductors

Part # TDA4780
Description  RGB video processor with automatic cut-off control and gamma adjust
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA4780 Datasheet(HTML) 14 Page - NXP Semiconductors

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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:
VG − Y = −0.51VR − Y − 0.19VB − Y
NTSC signals are matrixed by the equations (hue phase shift of
−2 degrees):
VR − Y* = 1.39VR − Y − 0.07VB − Y; VG − Y* = −0.46VR − Y − 0.15VB − Y; VB − Y* =VB − Y
For demodulation axis see Fig.11.
In the matrix equations: VR − Y and VB − Y are conventional PAL demodulation axes and amplitudes at the output of
the demodulator. VR − Y*, VG − Y* and VB − 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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