Preliminary Information
MT88V32
Wideband
Output Buffers
75Ω
10kΩ
Wideband
Input Buffers
10kΩ
75Ω
75Ω
MT88V32
X0
X1
X2
X3
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
10kΩ
75Ω
75Ω
Wideband
Output Buffers
75Ω
10kΩ
Control Interface
10kΩ
To next
switching
stage
10kΩ
R
Figure 3 - High Frequency Switching Applications
Figures 4, 5 and 6 show methods of interfacing the
MT88V32 to Motorola and Intel microcontrollers. The
address decoding for these configurations is in Table
3.
Video Signal Terminology
1) Component Video - separate red (R), blue (B),
green (G), and synchronization signals.
2) Composite
Video
-
contains
luminance
(brightness),
chrominance
(colour),
and
synchronization signal components in a single
waveform.
3) Synchronization signal - horizontal sync pulses
are negative going excursions of the composite
video signal that occur every 63.5 µsec. Their
function is to align the horizontal sweep.
Vertical synchronization is achieved during the
vertical blanking interval, which is about 1200
µsec or 20 horizontal scan intervals long. It
consists of a number of vertical synchronization
and equalization pulses.
4) Luminance - is the black to white brightness
component of a composite video signal. Its range
is from reference white (maximum amplitude) to
reference black (minimum amplitude).
5) Chrominance - rides on the luminance signal and
determines the hue (phase) and brightness
(amplitude) of the colour component of a
composite video signal.
6) Colour burst - is about 9 (minimum 8) cycles of a
3.578545 MHz reference signal, which is
transmitted with every horizontal sweep of the
composite video signal. A phase comparison
3-55
MITEL [ MITEL NETWORKS CORPORATION ]
