PMR Audio and Data Processor 2. CMX148 Block Diagram Core Operations and Routing MIC Voice Filter Tx Audio Processing VBIAS PreEmphasis Compressor Channel Filter Scrambler Soft Limiter (Sections can be de-selected and processing order is programmable) AUDIO DISC Voice Filter DeScrambler Rx Audio Processing VBIAS De-Emphasis (Sections can be de-selected and processing order is programmable) FFSK/MSK Demodulator BPF Data Modem Channel Filter Expander Free Format Free Format Flexible Packet Flexible Packet FFSK/MSK Modulator MOD1 (Free format and flexible packet operation are selectable ) Modulation Mode Programmable Tone Encoder HPF DTMF Decoder In-Band Signalling MOD2/ SIGOUT DTMF Encoder (Programmable tone and DTMF operations are selectable) SIG Filter CTCSS/DCS/Bypass Sub-Audio Signalling Support VBIAS Auxiliary Systems TXENA RXENA Configured IO SYSCLK1 SYSCLK2 System Clocks Control Systems C-BUS Interface Main PLL and Dividers Crystal Oscillator Ramp Profile RAM DAC 2 DAC 3 XTALN XTAL/CLK DACs DAC 4 ADC 1 ADC Inputs Registers Synthesised Clocks DAC 1 DAC Outputs IRQN RDATA CSN CDATA SCLK Digital IO Level Thresholds Averaging Level Thresholds Averaging DVDD VDEC DVSS Bias AVDD VBIAS AVSS Power Control MUX ADC 2 Regulator ADCs CMX148 Block Diagram © 2009 CML Microsystems Plc 6 D/148/5