FX829P4 datasheet(5/34 Pages) CMLMICRO

5 / 34 page

Baseband Signal Processor

FX829

D/829/4

1.3

Signal List (continued)

Package

D2/D5

Signal

Description

Pin No.

Name

Type

CARDCAP

O/P

The carrier detect integrating capacitor.

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.

MIC

I/P

The ac coupled Tx audio input (external

amplification is required for use as a microphone

input).

Vss

Power

The negative supply rail (ground).

DEMODIN

I/P

The ac coupled inverting input to the Rx input

amplifier (AMP1).

DEMODFB

O/P

The output of the Rx input amplifier (AMP1) and

the input to the audio filter/limiter section.

FILTER OUT

O/P

Output of the audio filter/limiter section. In

powersave mode this output is connected to

VBIAS via a 500kΩ resistor.

FFSK/DTMFOUT

O/P

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

VBIAS via a 500kΩ resistor.

On power-up, this output can be any level: a

General Reset command is required to ensure

that this output attains VBIAS initially.

SUM IN

I/P

Input to the audio summing amplifier (AMP2).

SUM OUT

O/P

Output of the audio summing amplifier (AMP2).

MOD1 IN

I/P

Input to MOD1 audio gain control.

VOL IN

I/P

Input to the audio volume control.

AUDIO OUT

O/P

Output of the audio volume control.

MOD1

O/P

Output of MOD1 audio gain control.

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