CMX882 Datasheet | CML

Feature Audio-Processing, Signalling and GPS Data for Half Duplex FRS, MURS, PMR446 and GMRS ‘Leisure’ Radios Features - Automatic signal type scanning and IRQ on detection of valid Rx signals, level or RSSI - Tone generator for caller recognition tunes - Programmable power down control - Programmable signal detection thresholds - Low Power operation with Zero Power mode - Unmitted Aux ADC with switchable input to monitor signals - Silent operation by removal of unwanted calls - Voice processing facilities, including Tx and Rx gain setting and voice/subaudio filtering - C-BUS serial host interface - RF interface allowing 1 or 2 point modulation - Programmable soft limiter - Enhanced CTCSS and 23/24 bit DCS codecs - Zero ‘talk down’ CTCSS decoder performance prevents dropouts - ‘All call code’ and ‘monitor’ modes for CTCSS - Selectable voice panding - Audio scrambling - XTCSS channel and data signalling - Robust Half Duplex FFSK/MSK modem, 1200/2400 bps, gets data through when signal is too degraded for voice - for text messaging/paging, location transfer, etc. applications. - Robust automatic packet data protocol with: Error correction and detection, Interleaving and data scrambling/privacy coding. © 2009 CML Microsystems Plc FRS Baseband Processor 1.1 Brief Description CMX882, a full-function half-duplex audio and signalling processor IC for FRS and PMR446 type facilities suitable for both plex and simple end-designs. Under the control of the host µC, all voiceband requirements are catered for: voiceband and sub-audio filtering, pre/de-emphasis, pression and expansion and audio routing and global level setting with single or two-point modulation in the transmit path. The bination of new and standard signalling functions of this product offer, under software control, increased functionality, versatility and privacy. Standard Extended-Code CTCSS and DCS functions are integrated with the new XTCSS code implementation. XTCSS provides additional and...