CMX469A データシートの表示（PDF） - CML Microsystems Plc

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CMX469A

1200/2400/4800 Baud FFSK/MSK Modem

CML Microsystems Plc 

1200/2400/4800 Baud FFSK/MSK Modem

CMX469A

1.5 General Description

The CMX469A has two sections, apart from the Xtal oscillator circuit and clock dividers. These

sections may be independently powersaved.

Transmitter

The transmitter is enabled by taking Tx EnableN low. Serial data applied to Tx Data Input is sampled

internally and an FFSK/MSK sequence is generated. After filtering, this is output at

Tx Signal O/P and the transmit clock derived from this signal is output at Tx Sync O/P.

Receiver

The receiver is enabled by taking Rx Enable high. The signal applied to Rx Signal I/P is filtered and

recovered as serial data from the Unclocked Data O/P. A flywheel synchroniser is used to extract a

clock from the recovered serial data stream. The clock is available at Rx Sync O/P and the retimed

serial data is available at Clocked Data O/P.

The integrated peak values of the Rx amplitude are compared with out-of-band noise levels and used

to make a signal-to-noise assessment, which is available at Carrier Detect O/P.

A Bandpass O/P is also available from the output of the first Rx filter stage, but will require buffering

before use.

© 2001 Consumer Microcircuits Limited

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D/469A/2

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