FX469J Consumer Microcircuits Limited, FX469J Datasheet

FX469J

Manufacturer Part Number

FX469J

Description

CDIP22

Manufacturer

Consumer Microcircuits Limited

Datasheet

1.FX469DW.pdf (10 pages)

Specifications of FX469J

Date_code

08+

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Features

Brief Description

The FX469 is a single-chip CMOS LSI circuit which

operates as a full-duplex pin-selectable 1200, 2400 or

4800 baud FFSK Modem. The mark and space

frequencies are 1200/1800, 1200/2400 and 2400/4800

Hz respectively. Tone frequencies are phase

continuous; transitions occur at the zero crossing point.

two clock frequencies (1.008MHz or 4.032MHz) to

provide baud-rate, transmit frequencies, and Rx and Tx

synchronization, the transmitter and receiver operate

entirely independently including individual section

powersave functions.

The FX469 includes on chip circuitry for Carrier Detect

and Rx Clock recovery, both of which are made

available as output pins.

Fig.1 Functional Block Diagram

Employing a common Xtal oscillator with a choice of

Selectable Data Rates

1200, 2400 and 4800 Baud

Full-Duplex FFSK

Rx and Tx Bandpass Filters

Clock Recovery and Carrier

Detect Facilities

Rx and Tx Enable Functions

Tx DATA I/P

Tx ENABLE

CLOCK RATE

XTAL/CLOCK

XTAL

1200/2400 BAUD SELECT

Rx ENABLE

Rx SIGNAL I/P

4800 BAUD SELECT

Tx GENERATOR

NOISE FILTER

Rx FILTER

OSCILLATOR

CLOCK

Tx FILTER

RECTIFIER

LIMITER

CML Semiconductor Products

PRODUCT INFORMATION

FX469

DIVIDER

RETRIGGERABLE

MONOSTABLE

COMPARATOR

.. n

S/N

CARRIER DETECT TIME CONSTANT

DIGITAL

FILTER

PLL

1200/2400/4800 Baud

FFSK Modem

FILTER

LATCH

DATA

bandpass filter to ensure the provision of optimum

signal conditions both in the modem and for the Tx

modulation circuitry.

good bit-error-rate under adverse signal conditions;

the carrier detect time constant is set by an external

capacitor, whose value should be arranged as

required to further enhance this product's performance

in high noise environments.

components and is available in small outline plastic

(S.O.I.C) and cerdip DIL packages.

Rx, Tx and Carrier Detect paths each contain a

The FX469 demonstrates a high sensitivity and

This low-power device requires few external

Pin Selected Xtal/Clock Inputs

1.008MHz or 4.032MHz

Radio and General Applications

Data-Over-Radio

PMR and Cellular Signalling

Portable Data Terminals

Personal/Cordless Telephone

LIMITER

CARRIER DETECT O/P

Publication D/469/6 April 1998

BANDPASS O/P

Tx SIGNAL O/P

Rx SYNC O/P

Tx SYNC O/P

UNCLOCKED

CLOCKED

DATA O/P

BIAS

FX469

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