CMX881 Overview
CMX881, a full-function half-duplex audio and signalling processor IC for both PMR and Trunked radio systems suitable for 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 and audio routing and global level setting with single or two-point modulation in the transmit path.
CMX881 Key Features
- Automatic signal type scanning and IRQ on detection of valid Rx signals, level or RSSI
- Voice processing facilities, including Tx and Rx gain setting and voice/subaudio filtering
- Tone generator for caller recognition tunes
- C-BUS serial host interface
- Programmable powerdown control
- RF interface allowing 1 or 2 point modulation
- Programmable signal detection thresholds
- Programmable soft limiter
- Low Power operation with ‘Zero Power’ mode
- Programmable Selcall Codec