CMX148 Datasheet | Consumer Microcircuits Limited

Features - Concurrent Audio/Signalling/Data Operations - plete Audio-band Processing: o Selectable Audio Processing Order o Pre and De-emphasis o Selectable 2.55/3.0 k Hz Filtering o Selectable Audio HPF Cut-off o pandor 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 - 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 - Sub-Audio Signalling Filters for CTCSS and DCS - Small VQFN and LQFP Packages Audio Out Mic Input Auxiliary Multiplexed ADC Inputs Filtered Signal for Host Decoding Auxiliary DACs Host Generated Signalling IRQ PMR Voice and Data Processor Modulator Host µC C-BUS Reference Clock 3.3V Supply Discriminator Tx Enable Rx Enable System Clock 1 System Clock 2 1. Brief Description 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. prehensive audio processing facilities include plete audio processing, filtering, panding, preor de-emphasis and frequency inversion scrambling. The CMX148 features an FFSK/MSK data modem for packetised or free-format data operations. Signal routing and filtering is included to assist host µC based signal encoding/decoding applications. A DTMF encoder/decoder, a full plement of auxiliary ADCs and DACs and dual synthesised clock outputs are included in this low power PMR processor. The device also has flexible powersaving...