CMX881 Baseband Processor for PMR and Trunked Radios

Brief Description
CMX881, a full-function half-duplex audio and signalling processor IC for both PMR and Trunked radio systems suitable for complex 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 and audio routing and global level setting with single or two-point modulation in the transmit path.
The combination of CTCSS and DCS functions and Selcall operation of this product offer, under software control, increased functionality, versatility and privacy.
To cater for call setup and system signalling the CMX881 provides an embedded 1200/2400 bps MSK/FFSK free-format modem for text messaging/paging, passing GPS location data with checksum generation and reception and sync detection in the Rx path.