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FX818 Datasheet(PDF) 5 Page - CML Microcircuits

Part # FX818
Description  CTCSS SIGNALLING PROCESSOR
PDF  26 Pages
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Manufacturer  CMLMICRO [CML Microcircuits]
Direct Link  http://www.cmlmicro.com
Logo CMLMICRO - CML Microcircuits

FX818 Datasheet(HTML) 5 Page - CML Microcircuits

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CTCSS Signalling Processor
FX818
© 1997 Consumer Microcircuits Limited
5
D/818/4
1.3
Signal List (continued)
Package
D2/D5
Signal
Description
Pin No.
Name
Type
8
NC
) No internal connection. Do not make
9
NC
) any connection to these pins.
10
A/D CAP
O/P
An internal reference voltage for the A to D,
decoupled to VSS by an external capacitor.
11
NC
No internal connection. Do not make any
connection to this pin.
12
Vss
Power
The negative supply rail (ground).
13
VBIAS
O/P
A bias line for the internal circuitry, held at ½
VDD. This pin must be decoupled by a capacitor
mounted close to the device pins.
14
RX AMP IN
I/P
The inverting input to the Rx input amplifier.
15
RX AMP OUT
O/P
The output of the Rx input amplifier and the input
to the audio filter section.
16
RX AUDIO OUT
O/P
Output of the Rx audio filter section.
17
NC
No internal connection. Do not make any
connection to this pin.
18
SUM IN
I/P
Input to the audio summing amplifier.
19
SUM OUT
O/P
Output of the audio summing amplifier.
20
MOD1 IN
I/P
Input to MOD1 audio gain control.
21
TX SUB AUDIO OUT
O/P
Output of the CTCSS tone generator.
22
MOD1
O/P
Output of MOD1 audio gain control.
23
MOD2
O/P
Output of MOD2 audio gain control.
24
VDD
Power
The positive supply rail. Levels and voltages are
dependent upon this supply. This pin should be
decoupled to VSS by a capacitor.
Notes:
I/P
=
Input
O/P
=
Output



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