Signal processor CMX148

digitalaudioIC

The CMX148 PMR audio and data processor is a half-duplex, signalling and data processing IC for use in systems that utilise the host µC to perform signalling, including CTCSS/DCS encoding/decoding. Comprehensive audio processing facilities include: complete audio processing, filtering, companding, pre or de-emphasis and frequency inversion scrambling. Signal routing and filtering is included to assist host µC based signal encoding/decoding applications. A DTMF encoder/decoder, a full complement of auxiliary ADCs and DACs and dual synthesised clock outputs are included in this low power PMR processor. The device also has flexible powersaving modes and is available in 48-pin VQFN and LQFP packages. Concurrent Audio/ Signalling/Data Operations Complete Audio-band Processing: – Selectable Audio Processing Order – Pre and De-emphasis – Selectable 2.55/3.0 kHz Filtering – Selectable Audio Highpass Filter Cut-off – Compandor – 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 Sub-audio Signalling Filters for CTCSS and DCS Routing for Host µC Signalling Dual Auxiliary ADC with Four Multiplexed Inputs Four Auxiliary DACs Dual Programmable System-Clock Outputs Tx Outputs for Single, Two-point or I/Q Modulation Microphone and Discriminator Analogue Inputs Digital Gain Adjustment/s C-BUS Serial Interface to Host µC Flexible Powersave Modes