FX803DW Consumer Microcircuits Limited, FX803DW Datasheet

FX803DW

Manufacturer Part Number

FX803DW

Description

SOP24

Manufacturer

Consumer Microcircuits Limited

Datasheet

1.FX803DW.pdf (17 pages)

Specifications of FX803DW

Date_code

05+

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FX803 Audio

Signalling Processor

FX803 Audio Signalling Processor

processor will provide an inband tone signalling facility for

PMR radio systems. Signalling systems supported include

Selcall (CCIR, ZVEI I, II and III, EEA), 2-Tone Selcall and

Dual Tone Multi-Frequency (DTMF) encode.

encoders gives the FX803 the capability to work in any

standard or non-standard tone system.

This is a full-duplex device consisting of:

For use with Single Tone or Selective Call systems.

FX803 will encode and transmit a single or pair of audio

tones, in the frequency range 208Hz to 3kHz,

simultaneously, and detect, decode and indicate the

frequency of non-predicted input tones in the frequency

range 313Hz to 6kHz.

Publication D/803/6 April 1998

Fig.1 FX803 Audio Signalling Processor

As part of the DBS 800 System, this audio signalling

Using a non-predictive tone decoder and versatile

Under the control of the Controller, via “C-BUS,” the

SIGNAL INPUT BIAS

(Rx) AUDIO IN

Two individual tone generators and a

programmable (Tx) period timer.

A tone decoder with programmable N

Timer.

An on-chip summing amplifier.

XTAL/CLOCK

AUDIO SWITCH IN

BIAS

XTAL

AMPLIFIER

INPUT

GENERATOR

CLOCK

PROGRAMABLE

(Tx PERIOD)

FILTER 1

DIGITAL

AUDIO SWITCH

NOISE

TIMER

Rx FILTER

SWITCH

OTONE

GENERATOR

CUES / DTMF 2

FILTER 2

DIGITAL

5- / 2-TONE

NOISE

TONE 1

TONE 2

DTMF 1

BIAS

AMPLIFIER

SUMMING

power economical “Powersave” mode.

Status Register, is provided. This could be used as an

auxiliary method of routeing digital information to the

the device, with a programmable, general purpose, on-chip

timer available to indicate the tone transmit periods.

by combining the 2 independent output frequencies in the

integral summing amplifier. This Summing Amplifier output

is also available for level adjustment.

DBS 800 system as modulation calibration inputs and for

“CUE” audio indications for the operator.

indicated to the Controller in the form of a received data

word. A poor-quality or incoherent tone will, after a

programmed period, indicate N

and is available in 24-pin DIL cerdip and 24-pin/lead plastic

SMD packages.

GENERATOR

FREQUENCY

Controller via the “C-BUS.”

GATE TIME

COUNTER

Both tone generators can be individually placed into a

The output frequencies are produced from data loaded to

A Dual Tone Multi-Frequency (DTMF) output is obtained

Tones produced by the FX803 can also be used in the

Received tones are measured and their frequency

The FX803 is a low-power, 5-volt CMOS integrated circuit

QUALITY

A general purpose logic input, interfacing directly with the

METER

PROGRAMABLE

NOTONE

CUES

TIMER

CAL

SUMMING

CAL/CUES

SWITCH

INTERFACE

OTONE

CONTROL

FILTER

PASS

C-BUS

LOGIC

PASS

LOW

AND

SWITCHED SUM OUT

AUDIO SWITCH OUT

COMMAND DATA

SERIAL CLOCK

CAL/CUES OUT

CHIP SELECT

LOGIC INPUT

REPLY DATA

TONE 1 OUT

TONE 2 OUT

INTERRUPT

SUM OUT

SUM IN

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