XV-Cl
E
Ill.
Functions
i) Functions of pins
l
SW (pin No. 1)
Used to switch between the
INT
signal from the video
chroma
circuit and the EXT signal from the EXT R/G/B
input terminal. At
“L”
level, the
INT
signal is accepted; at
“H”
level, the EXT signal.
l
CONTRAST (pin No. 2)
Used to receive DC voltage and to adjust the contrast of primary
colour
output.
l
EXT IN
B,
EXT IN
G,
EXT IN
R
(pin Nos. 3, 4 and 5)
Used to receive the external
R,
G
and
B
inputs. Each input should come through a coupling capacitor.
l
VCCl (pin No. 6)
Used to connect positive-polarity power.
l
VEE (pin Nos. 7 and 31)
Used to connect negative-polarity power.
l
C
IN (pin No. 8)
Used to input the
chroma
signal.
l
ACC FILTER (pin No. 9)
Used to connect with the ACC detection filter.
l
Y
IN (pin No. 10)
Used to receive the luminance signal.
l
COLOR (pin No. 11)
Used to receive DC voltage for
colour
adjustment.
l
F
ADJ (pin No. 12)
A resistor is added between this terminal and GND. Used to adjust the filter’s frequency characteristic.
l
AGC OUT (pin No. 13)
Used to output the voltage detected by the video system AGC detector.
l
AGC FILTER (pin No. 14)
Used to connect a filter to detect the video system’s AGC.
l
CLAMP (pin No. 16)
Used to connect with a capacitor to clamp the luminance signal pedestal.
l
APL (pin No. 17)
Used to connect a filter to detect the luminance signal’s APL (Average Picture Level).
l
H
FILTER OUT (pin No. 18)
Used to output the video signal for sync separation.
l
SYNC SEP (pin No. 19)
Used to input the video signal for the sync separation circuit.
l
SYNC OUT (pin No. 20)
Used to output the sync signal picked up by the sync separation circuit. Can be connected with a controller
with different power supply because of the open-collector output type. The output signal gets to
“H”
level
for
sync and to
‘I”
level otherwise.
25
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