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CML baseband processor provides XTCSS signaling

Posted: 26 Jun 2002 ?? ?Print Version ?Bookmark and Share

Keywords:cmx883? radio ic? xtcss signaling? ctss signaling? dcs signaling?

The CMX883 half-duplex audio and signaling processor IC from CML Microcircuits (UK) Ltd provides XTCSS signaling, as well as Enhanced CTSS and DCS signaling functions for "leisure band" radios such as FRS, PMR446, GMRS, and MURS.

XTCSS signaling is claimed by the company to provide better squelch privacy codes with the added advantage of 'silent operation'. The format concurrently employs sub-audio holding tone and in-band signaling to offer more than twice as many privacy codes as standard CTCSS operation.

The signal is fully-compatible with both conventional and enhanced CTCSS signaling operation, and can implement "All Call" and "All Codes Monitor" functions as well as controlling over-air system configuration such as companding.

Available in 28-pin SSOP and TSSOP casings, the CMX883 operates from a 3V source and draws 8mA. It performs voiceband and sub-audio filtering, pre/de-emphasis, compression and expansion and audio routing, and global level setting with single or two-point modulation in the transmit path.

The IC provides automatic packet data protocol with error correction and detection, interleaving, and data scrambling/privacy.

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