Cm8870Cfit - Alinco DJ-G1T Service Manual

2) CM8870CFIT (XA0231)
CTCSS Encoder/Decoder
Function Table
Nam e Description
IN+ Inverting Input
Noninverting Input
IN-
GS Gain Selection
Vref Reference Voltage Output
INH
PD Power Down Control
OSC1 Clock Input
O S C 2 Clock Output
Vss Negative Power Supply
TOE
Three State Output Enable
Q1
Q2
Three State Output (RX Data Output)
Q3
Q4
StD
Delay Steering Output
ESt
First Steering Output
St/GT Steering Input/Guard Time Output
Vdd Positive Power Supply
CJ 1
IN+ 18
cz
2
17
IN-
c z
3 16
GS
o
cz
4
15
Vref
2
00
c z =
5 14
IN H CO
o
6
cz:
13
PD
O
zz
7
OSC1 12
a
8
OSC2 11
9
cz
10
Vss
Decode Ta ble
F high
F low
697 1209
697 1336
697 1477
770 1209
770
1336
770 1477
1209
852
1336
852
1477
852
641 1336
941 1209
941 1477
697 1633
770 1633
852 1633
941 1633
-
L: Logic Low, H: Logic High, Z=High Impedance.
ZD
Vdd
=3
St/Gt
ZD
ESt
IZ)
StD
ZZ
0 4
ZZl
0 3
ZZI
Q2
ZD
Q 1
b n
TOE
Q4
Key TOE Q3
H 0 0
1
0
2 H 0
3 H 0 0
1
4 H 0
5 H 0 1
.
H
6 0 1
7 H 0 1
8 H 1 0
9 H 1 0
1
0 H 0
1 0
H
# H 1 1
A H 1 1
B H 1 1
C H 1 1
D H 0 0
z z
ANY L
0 2 Q1
0 1
1 0
1
1
0 0
0 1
1
0
1 1
0
0
0 1
1
0
1
1
0 0
0 1
0
1
1 1
0 0
z z