FX829D2 CMLMICRO [CML Microcircuits], FX829D2 Datasheet - Page 5

• Manufacturer Part Number: FX829D2
• Description: Baseband Signal Processor
• Manufacturer: CMLMICRO [CML Microcircuits]

Baseband Signal Processor
1.3
Package
1997 Consumer Microcircuits Limited
Pin No.
D2/D5
10
11
12
13
14
15
16
17
18
19
20
21
22
9
Signal List
CARDCAP
V
MIC
V ss
DEMODIN
DEMODFB
FILTER OUT
FFSK/DTMFOUT
SUM IN
SUM OUT
MOD1 IN
VOL IN
AUDIO OUT
MOD1
BIAS
Name
(continued)
Signal
Power
Type
O/P
O/P
O/P
O/P
O/P
O/P
O/P
O/P
I/P
I/P
I/P
I/P
I/P
The carrier detect integrating capacitor.
A bias line for the internal circuitry, held at
½ V
capacitor mounted close to the device pins.
The ac coupled Tx audio input (external
amplification is required for use as a microphone
input).
The negative supply rail (ground).
The ac coupled inverting input to the Rx input
amplifier (AMP1).
The output of the Rx input amplifier (AMP1) and
the input to the audio filter/limiter section.
Output of the audio filter/limiter section. In
powersave mode this output is connected to
V
The 1200 or 2400 baud FFSK Tx output and the
DTMF encoder output. When enabled but not
transmitting FFSK or DTMF signals, or when in
powersave mode, this output is connected to
V
On power-up, this output can be any level: a
General Reset command is required to ensure
that this output attains V
Input to the audio summing amplifier (AMP2).
Output of the audio summing amplifier (AMP2).
Input to MOD1 audio gain control.
Input to the audio volume control.
Output of the audio volume control.
Output of MOD1 audio gain control.
BIAS
BIAS
DD
5
via a 500k
via a 500k
. This pin must be decoupled by a
Description
resistor.
resistor.
BIAS
initially.
D/829/4
FX829