Panasonic KX-B620 - Page 55

KX-B620 Series
KX-B520 Series
2-9 CCD Sensor Board
1) Function
This
block
is
made
up
of
the
CCD
sensor
“UPD3575”
(1C201)
which
has
a
sampling
circuit
inside,
and
broad
-
band
amp
“NJM318D”
(iC202)
.
The
main
operation
of
the
amp
is
amplifying
the
signal
from
CCD.
Block diagram
High Speed,
Broad-Band
Amp
The
fluorescent
light
illuminates
the
image
on
the
screen,
its
image
is
reflected
in
a
mirror,
and
input
into
the
CCD.
The
output
from
the
CCD
is
in
proportion
to
the
amount
of
light.
2) Circuit Operation
@ CCD section
A
CCD
(Charge
Coupled
Device)
is
composed
of
the
1,024
bit
linear
image
sensor.
It
converts
the
optical data to electrical data. The driving of CCD needs four kinds of clocks which are ¢ro, ¢sxo,
¢10 and $76. It is possible for CCD to drive in TTL.
Clock
is
inputted
from
the
main
control
P.C.B.
to
the
CCD
P.C.B.
through
CN6.
Each Clock Description
Ro: Reset gate clock signal
Buffer amplifier is as follows:
L____—o @RO
Transterring
section
se output
Fig. 33