Family Radio CTCSS 'Type 2' Encoder and Decoder
CMX808A
1.3
Signal List (continued)
Package
Signal
Description
E3
P4
Pin No. Pin No.
Name
Type
8
9
8
9
NC
NC
) No internal connection. Do not make
) any connection to these pins.
10
11
A/D CAP
NC
O/P
An internal reference voltage for the A to D,
decoupled to V by an external capacitor.
SS
No internal connection. Do not make any
connection to this pin.
10
11
12
13
V
V
Power The negative supply rail (ground).
ss
O/P
A bias line for the internal circuitry, held at ½
. This pin must be decoupled by a
BIAS
V
DD
capacitor mounted close to the device pins.
12
13
14
15
RX AMP IN
I/P
The inverting input to the Rx input amplifier.
RX AMP OUT
O/P
The output of the Rx input amplifier and the
input to the audio filter section.
14
16
17
RX AUDIO OUT
NC
O/P
Output of the Rx audio filter section.
No internal connection. Do not make any
connection to this pin.
15
16
17
18
19
18
19
20
21
22
23
TX AUDIO IN
TX AUDIO OUT
VOLUME IN
TX SUB AUDIO OUT
VOLUME OUT
NC
I/P
O/P
I/P
Input to the Tx audio filter section.
Output of the Tx audio filter section.
Input to the audio volume control.
Output of the CTCSS tone generator.
Output of the audio volume control.
O/P
O/P
No internal connection. Do not make any
connection to this pin.
20
24
V
DD
Power The positive supply rail. Levels and voltages
are dependent upon this supply. This pin
should be decoupled to V by a capacitor.
SS
Notes: I/P = Input
O/P = Output
2003 CML Microsystems Plc
5
D/808A/6
CMLMICRO [ CML MICROCIRCUITS ]
