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PRODUCT INFORMATION

CML Semiconductor Products

Product Summary

Trunked Radio Systems

FX529

FFSK

RECEIVER

SYNC

SYNC

Rx ENABLE

1.008 MHz

OUTPUT

A

1

Rx DATA READY

Rx DATA RDY

Tx DATA RDY

Tx IDLE

TRANSMITTER

OUTPUT

Rx MESSAGE FORMAT

LO

Rx MESSAGE FORMAT

Rx CHECKSUM TRUE

HI

D

3

D

6

Tx DATA READY

D

0

A

0

Rx CARRIER DETECT

Tx PARITY ENABLE

D

2

D

5

Tx IDLE

D

7

Rx CHECKSUM TRUE

D

1

D

4

TIMER EXPIRED

Tx PARITY

ENABLE

SYNT

SYNT

Tx ENABLE

BYTE

STATUS

CONTROL

CHECKSUM

SYNC/SYNT

Tx DATA

BUFFER

Tx DATA

CHECKSUM

INTERRUPT

DATA

DATA

RECOVERED CLOCK

Rx CARRIER

DETECT

MICROPROCESSOR

INTERFACE

Rx DATA

BUFFER

BYTE

CARRIER DETECT

TIME CONSTANT

COUNTER

REGISTER

REGISTER

CLOCK

GENERATORS

TIMER

COUNTER

DETECTOR

8-bit µP BUS

Rx DATA

REGISTER

REGISTER

GENERATOR

GENERATOR

COUNTER

FFSK

TRANSMITTER

RECEIVER INPUT

XTAL/CLOCK

CLOCKS

V

DD

V

BIAS

V

SS

STROBE

XTAL

IRQ

R/W

1200/2400 Baud

Brief Description

The FX529 is a single-chip CMOS 1200 baud FFSK

Modem, designed primarily for use in trunked radio

systems but may also be employed in other general

purpose radio or line data communication applications.

This device conforms to both the PAA 1382 French

trunked radio, and the proposed ETSI

I-ETS 300 230 “Binary Interchange of Information and

Signalling” specifications.

The FX529 is full duplex at 1200 baud and includes

an 8-bit parallel microprocessor interface and a

programmable timer which may be set for interrupt

periods of between 8 and 120 bits.

Preamble data and an error-check word are

automatically generated in the transmit mode.

Error checking is performed and the 16-bit SYNC

(“1011010000110011”) or SYNT

(“0100101111001100”) word detected in the receive

mode.

An on-chip Xtal/clock generator requiring an

external 4.032MHz Xtal or clock input provides all

microcircuit filter sampling clocks and modem timings

whilst also supplying a “Clock “ 4” output (1.008MHz).

Pin and function compatible with the FX429, the

FX429 data sheet should be consulted when using this

device

The FX529, which has a powersaving facility,

requires a single 5-volt power supply and is available

in both cerdip DIL and plastic SMD packages.

Features

PAA 1382 and General Purpose

Trunked Radio Applications

Meets ETSI I-ETS 300 230 Binary

Signalling Specification

Full-Duplex 1200 Baud Operation

High Intelligence

Error Checking in Receive

Frame SYNC/SYNT Detection

Preamble Generation

µProcessor Compatible Interface

Carrier Detection On-Chip

General Purpose Timer

Error Check Word Generation