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