CMX882 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.
CMX882 Key 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
- 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
CMX882 Applications
- Robust automatic packet data protocol with: Error correction and detection, Interleaving and data scrambling/privacy coding