CMX148 - Consumer Microcircuits Limited

CMX148 PMR Audio and Data Processor

The CMX148 is a half-duplex, audio, signalling and data processing IC for use in PMR systems that utilise the host µC to perform signalling, including CTCSS/DCS encoding/decoding. The device is intended for use in general leisure and professional PMR terminals. Comprehensive audio processing facilities include complete audio processing, filtering, companding.

Features

• Concurrent Audio/Signalling/Data Operations
• Complete Audio-band Processing: o Selectable Audio Processing Order o Pre and De-emphasis o Selectable 2.55/3.0 kHz Filtering o Selectable Audio HPF Cut-off o Compandor o Limiter
• Programmable Voice Scrambler
• MSK/FFSK Data Modem with Packet or Freeformat Modes with FEC, CRC, Interleaving and Scrambling
• DTMF and Audio Tone Encoder/Decoder
• Routing to Support Host µController Signalling
• Sub-Audio Signalling Filters for CTCSS and DCS
• Dual Auxiliary ADC, 4 Multiplexed Inputs
• 4 x Auxiliary DACs
• Dual Programmable System Clock Outputs
• T.