Voltage References

Figure 1 shows a simplified block diagram representation
of the basic system using the MC44001 and its companion
device the MC44140 chroma delay line. The Chroma 4 has
been designed to carry out all the processing of video
signals, display controls and timebase functions. There are
two video inputs which can be used for normal composite
video or separate Y and C inputs. In either case, the inputs
are interchangeable and selection is made via the 12C bus.
The video is decoded within the MC44001 which involves
Compo Video { Video 1
or
S·VHS Video 2
Ext R·Y o-j
ExtB.Yo-j
MC44001
GENERAL DESCRIPTION OF THE CHROMA 4 SYSTEM
Y10ut
R·YOut
Fast Commutate 0----+1
Figure 1. Connection to TV Chassis
+5.0V
V·Drive
VO/P
DIA Stage
R·O/P
G·O/P
B·O/P
Feedback
separation, filtering and delay of the luminance part of the
signal, and demodulation of the chroma into color difference
signals. The luminance (called Y1) together with the
demodulated R-Y and 8-Y are all then brought out from the
IC. The color difference signals then enter the MC44140
which performs color correction in PAL and the delay line
function in SECAM. Corrected color difference signals then
re-enter the MC44001.
H.T.
+26V
V·Scan
Coils
MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA
9-163
H·Scan
Coils
Unerarity
G1 G2 G3
EHT