CML Semiconductor Products

CDPD Wireless Modem Data Pump

FX949

© 1996 Consumer Microcircuits Limited

Obsolete Product

1.0

Features

'For Information Only'

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MES Full Duplex Operation

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19.2kb/s GMSK Modulation

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Forward Channel Decoding

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Sleep Timer Included

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Reverse Channel Encoding

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3.3V and 5V Applications

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Error Detection and Syndrome Output

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PCMCIA Package Option

1.1

Brief Description

The FX949 is a low power CMOS integrated circuit which performs all of the real-time signal and data

format-management functions required for full-duplex operation of a CDPD Mobile End Station.

The FX949 interfaces directly with the analogue modulation and demodulation circuits of the radio and

the host radio/application processor bus.

It accepts application data from the processor, constructs a correct Reverse Channel packet containing

this data and converts the packet to GMSK analogue signals for transmission. In receive, Forward

Channel GMSK signals from the discriminator are demodulated, the packet disassembled, error

checked, and the recovered application data passed to the processor.

The FX949 is the cost, size, and power efficient alternative to DSP design solutions in high

performance OEM products for the Cellular Digital Packet Data wireless services.