Analog Transceiver Front End for Digital Radio

May 13, 2014 | 00:15
Analog Transceiver Front End for Digital Radio
Analog Transceiver Front End for Digital Radio

CML Microcircuits have now added an analog front end to their range of RF chips. The CMX983 is designed for use in Software Defined Radio designs where it forms an interface between the RF send and receive section and the radio’s DSP/FPGA system.

It performs DSP intensive functions, providing dual-channel A/D and D/A converters together with two RF fractional-N synthesisers and additional converters for use in the radio system. The CMX983 is designed for radio systems using modulation bandwidths up to 25.8 kHz, making it suitable for satellite communication, high speed wireless data and two-way radio systems. It can be configured to support various sample rates and filtering characteristics.

The CMX983 interfaces directly with the company’s CMX994 direct conversion receiver and the CMX998 cartesian feedback loop transmitter to make a complete RF-to-digitised baseband solution operating at frequencies up to 1 GHz and meets the low operating power requirements of new SDR based terminals. Separate 3.3 V and 1.8 V power supplies are required and a facility allows the PLL charge pumps to operate at up to 4.75 V, providing low noise operation.

The CMX983 main features:

  •  Rx channel - Two 16-bit Σ-Δ A/D Converters - Programmable Channel Filter
  •  Tx Channel - Two 14-bit Σ-Δ D/A Converters - Programmable Channel Filter
  •  RF Support - Two 2.1 GHz Fractional-N Synthesisers
  •   Auxiliary Functions - 10-bit A/D Converter supporting (8-inputs) - Five Analog Comparators - Nine 10-bit D/A Converters
  •   DSP Interface - BUS Control and Configuration Port - Fast Serial Interface for Rx/Tx Data
  •   Duplex and Half duplex operation
  •   Direct connection to: - CMX998 Cartesian Loop Transmitter - CMX994 Direct Conversion Receiver
  •   Low power operation - 3.3 V and 1.8 V supplies
  •   Small 64-lead VQFN Package

Applications include:

  • Software Defined Radio (SDR)
  • Satellite Communication
  • Wireless Data Terminals
  •  Digital PMR/LMR Radio - TETRA - DMR - APCO P25 - PDT

For more information contact  CML Microcircuits

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