Pin
!
No.
Symbol Designation
of
terminal Description
of
functions and operations
I
GND
Earth terminal
2
Crystal oscillator connection
Connection
of
9.0MHz crystal oscillator.
3
XT
terminal
Data reading instruction input terminal for
A,
B, C and
4 LOAD
Load
input
terminal
D. Data
is
read when this tenninal
is
at
"H"
level,
but
when
at
"L"
level, the previous
data
is
held regardless
of
other inputs.
5
A
6
B
Program/data input
Input terminal for reference frequency selection
data
7
C
terminals and programmable counter division digit data.
8
D
Programmable
counter
input
9
PIN
terminal
To
be connected
to
the prescaler TD6102P for
fine
10
PouT-1
Programmable
counter
output
adjustment
of
IF
frequency
in
FM
or
for 50 kHz shift in
11
PouT-2
terminal
Europe.
The
signal
of
Pout-I and Pout-2
is
output
at
the
point
of
different phase.
12
100 kHz 100 kHz clock
output
terminal
13
LD
Lock-out detection terminal "H" level when lock-out occurs.
14
Do-I
Phase comparator
output
To be connected to low-pass filter.
I
IS
Do-2 terminal
16
Voo
Power terminal
+7V
Fig.
1-35
6.
PLL
DATA FOR
PLL
IC
(TC9125P) CONTROL
The data received from @
to
@
of
Micro-computer
(IC2 AT-600) includes the
mode
data
to
select
the
reference frequency and to control
the
Pout
output,
FM:
PLL
data=
[ received frequency + IF frequency J x I 0
Example: 98MHz received.
and
the
PLL data
to
determine the dividing factor
of
the programmable counter. This PLL data
is
added
to
the A
to
D terminals ( @
to
®)
of
TC9125P.
The
data reading is controlled by
tye
load terminal ( ©
),
Le.
when the load terminal
is
at
"H'',
the data from
A
to
D
is
read into the latch, and when '·L", no
reading
is
done
but
the
previous data
is
retained.
The PLL data
is
determined in the following manner.
PLL
data=
[98.0 + 10.7] x 10 = 1087
MW(AM):
PLL
data=
Receivl:'d frequency + IF frequency
frequency change
of
I
step
Example: 530 kHz received
(IO
kHz steps)
PLL data
=
530
+
460
= 99
IO
LW:
PLL
data=
received frequency +
IF
frequency
Example: 137 kHz received
PLL
data=
137 +
459
= 596
-------------SERVICE
MANUAL
AA·R22/L, AA-R32/L,
AA·R42-------------
25
I
I
To Next Page
Loading...
Need help?
General
