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CML Microcircuits has released a function image for the CMX7131 and CMX7141 ICs, supporting the development of NXDN-compatible digital voice radio equipment.

Called NXDN, its common air interface (CAI) is the result of a joint development between Kenwood and Icom.

NXDN digital radio equipment supports commercial private land mobile radio (PLMR/LMR) to serve light commercial, more demanding business and industry and public safety applications, even on 6.25kHz channels.

The technology satisfies the US Federal Communications Commission (FCC) Part 90 ‘narrow-banding’ requirements; as of December 2009, 70,000 radio-frequency (RF) channel licences are approved for NXDN operation.

The CMX7131 and the CMX7141 are digital PMR processors built on CML’s proprietary Firmasic technology and are suitable for use in a number of digital radio systems now including NXDN.

Firmasic component technology enables on-chip subsystems to be configured by a function image – a data file that is uploaded during device initialisation that defines the device’s function and feature set.

This technology provides the flexibility for the CMX7131 and the CMX7141 to support dPMR, DCR and NXDN radios as well as analogue two-way radios.

The new function image developed by CML features: a 4FSK data pump supporting soft-decision coding mode (which improves the reliability of the data link) and integrated RRC filters; an autonomous AFSD that simplifies host microcontroller development and risk, differentiating between frame sync cases, which can also reduce an NXDN receiver’s average Rx power consumption; a voice codec (ADC and DAC) for microphone/speaker paths to complement an external AMBE-3000 vocoder device; and integrated auxiliary functions that reduce cost and size.

CML Microcircuits

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