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FX829D2

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FX829D2 技术参数

CML Semiconductor Products

Baseband Signal Processor FX829

D/829/4 September 1997

1.0

Features

Provisional Issue

· Rx Audio Processing

· Tx Audio Processing

· 1200/2400 Baud Modem

· DTMF Encoder

· Multi-standard Modem Formats

· ETS/MPT/PAA Standards Compatible

· Low Voltage Operation

· 24-pin Small Form Package

1.1

Brief Description

The FX829 is a low voltage CMOS integrated circuit, designed to provide the baseband audio and

system signal-processing functions required for PAMR or PMR trunked radio applications. It operates

in half-duplex mode under serial-bus control of the host µC.

The FX829 incorporates a dual-rate 1200/2400bps FFSK modem, with a software-flexible choice of

synchronisation codewords, data run-length and CRC checking to suit a wide range of applications.

These features allow very flexible handling of non-prescribed data on traffic channels in addition to the

network signalling sent on control channels. A 16 character DTMF encoder is available in the transmit

mode. The two-point modulation output has software programmable level-adjustment.

The audio processing stages include transmit and receive filtering, to the standards specified for

12.5kHz and 25kHz PAMR/PMR channel operation, plus transmit deviation limiting and a

programmable Rx volume control. Power saving is automatic when audio functions are deselected.

The FX829 is designed for use in radios compatible with MPT1327, PAA1382 and ETS 300 086

trunking standards. Its features and flexibility ensure that it is equally suitable for use with modified or

proprietary standards.

ã 1997 Consumer Microcircuits Limited

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