FX818 查看數據表（PDF） - CML Microsystems Plc
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FX818 Datasheet PDF : 26 Pages
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CTCSS Signalling Processor
FX818
1.3 Signal List (continued)
Package
D2/D5
Signal
Pin No.
Name
8
NC
9
NC
10
A/D CAP
11
NC
12
Vss
13
VBIAS
14
RX AMP IN
15
RX AMP OUT
16
RX AUDIO OUT
17
NC
18
SUM IN
19
SUM OUT
20
MOD1 IN
21
TX SUB AUDIO OUT
22
MOD1
23
MOD2
24
VDD
Description
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 VSS by an external capacitor.
No internal connection. Do not make any
connection to this pin.
Power The negative supply rail (ground).
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.
I/P The inverting input to the Rx input amplifier.
O/P The output of the Rx input amplifier and the input
to the audio filter section.
O/P Output of the Rx audio filter section.
No internal connection. Do not make any
connection to this pin.
I/P
Input to the audio summing amplifier.
O/P Output of the audio summing amplifier.
I/P
Input to MOD1 audio gain control.
O/P Output of the CTCSS tone generator.
O/P Output of MOD1 audio gain control.
O/P Output of MOD2 audio gain control.
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
© 1997 Consumer Microcircuits Limited
5
D/818/4
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