CMX148

CML Microcircuits COMMUNICATION SEMICONDUCTORS CMX148 PMR Audio and Data Processor D/148/6 November 2010 Audio Processing, DTMF and FFSK/MSK Data Modem with Auxiliary Functions for use in Analogue PMR Systems 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 Tx Outputs for Single, Two-Point or I/Q Modulation Microphone and Discriminator Analogue Inputs Digital Gain Adjustment Default 3.6864MHz Xtal/Clock C-BUS Serial Interface to Host µController Flexible Powersave Modes Low-power 3.3V Operation Small VQFN and LQFP Packages Host µC Audio Out Mic Input Filtered Signal for Host Decoding Host Generated Signalling IRQ C-BUS Reference Clock 3.3V Supply CMX148 PMR Voice and Data Processor Auxiliary Multiplexed ADC Inputs Auxiliary DACs Modulator Discriminator Tx Enable Rx Enable System Clock 1 System Clock 2 RF 1. Brief Description The CMX148 is a half-duplex, audio, signalling and data processing IC for use in...