DB1065 Datasheet, PDF (16/23 Pages) CML Microcircuits – CTCSS Encoder / Decoder Development Kit

6. Logic Table for operation
6.1 I/O Conditions
D0-D5
Tone
No Tone
Tone
Tone
Tone
No Tone
Input Pin Condition
CTCSS
PTT PTL _{Tone in}
0
0
X
0
X
X
1
0
No
1
1
No
1
X
Yes
1
X
X
Output Pin
Condition
DECODE
Tone
MONIT0R _Transmitter
Enabled
0
1
Yes
0
1
No (bias)
0
1
No (bias)
0
1
No (bias)
o/c
0
No (bias)
o/c
0
No (bias)
Result/Function
TX Audio
Path
Enabled
Yes
Yes
No
No
No
No
Tone
Decoder
Enabled
No
No
Yes
Yes
Yes
Yes
RX Audio
Path
Enabled
No (bias)
No (bias)
No (bias)
Yes
Yes
Yes
Table 3: Combinations of input/output conditions
Notes
1
2
3a
3b
4
5
Notes: o/c = Open circuit
X = don’t care
1. Normal tone transmit condition.
2. Notone programmed in TX mode, tone transmit O/P set to V_DD/2. TX audio path enabled.
3a. Normal decode standby.
3b. Normal decode standby with PTL used to enable audio.
4. Normal decode of correct CTCSS tone condition, PTL has no effect.
5. Notone programmed in RX mode, tone transmit O/P (o/c). RX audio path enabled.
6.2 CTCSS Programming
Nominal
Frequency (Hz)
67.0
69.3
71.9
74.4
77.0
79.7
82.5
85.4
88.5
91.5
94.8
97.4
100.0
103.5
107.2
110.9
Tone
MX465
Frequency (Hz)
66.98
69.32
71.901
74.431
76.965
79.677
82.483
85.383
88.494
91.456
94.76
97.435
99.96
103.429
107.147
110.954
 f₀ (%)
-0.029
0.024
0.001
0.042
-0.046
-0.029
-0.021
-0.020
-0.007
-0.048
-0.042
-0.036
-0.040
-0.069
-0.05
0.049
Programming Inputs, Switch (Solder Jumper)
D5 D4 D3 D2 D1 D0 Hex
(E6) (E5) (E4) (E3) (E2) (E1)
1
1
1
1
1
1
3F
1
1
1
0
0
1
39
0
1
1
1
1
1
1F
1
1
1
1
1
0
3E
0
0
1
1
1
1
0F
1
1
1
1
0
1
3D
0
1
1
1
1
0
1E
1
1
1
1
0
0
3C
0
0
1
1
1
0
0E
1
1
1
0
1
1
3B
0
1
1
1
0
1
1D
1
1
1
0
1
0
3A
0
0
1
1
0
1
0D
0
1
1
1
0
0
1C
0
0
1
1
0
0
0C
0
1
1
0
1
1
1B
20480150.001 MX-COM
1996
Page 16