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Wireless data modem IC targets narrowband apps

Posted: 08 Apr 2011     Print Version  Bookmark and Share

Keywords:wireless  data modem  narrowband 

CML Microcircuits introduces the CMX7164 Multi Mode wireless data modem IC offering 4/16/64-QAM and root raised cosine 2/4FSK base band modem functions in a single chip.

The CMX7164 replaces the current need for user programmed DSP plus codec ICs. This development includes digital IF filters, auxiliary codecs, clock generator and I/O functions that lower total BOM cost and chip count.

The device is a complete base band modem system delivering multiple modulations for narrowband applications. These include M2M systems over dedicated channels, digital Software Defined Radio (SDR), high-speed wireless data and SCADA systems. The half-duplex device operates up to 96kbps in 25kHz and it supports 6.25kHz, 12.5kHz and 25kHz bandwidths, aimed at narrowbanding migration worldwide.

The high level of total integration reduces unnecessary technical risk and time to market. Device capabilities are expandable and additional modulation types such as GMSK/GFSK will be provided. QAM provides new, higher data rates and legacy RRC 4FSK and GMSK/GFSK features provide backward compatibility with legacy systems.

The device utilises CML's proprietary FirmASIC component technology. On-chip sub-systems are configured by a Function Image data file that is uploaded during device initialisation and defines the device's function and features set. The device's functions and features can be enhanced by subsequent Function Image releases, facilitating in-the-field upgrades.

The CMX7164 logical interface provides addressable configuration parameters that ease host driver development. Selectable modulation, symbol rate and FEC suit a wide range of application requirements without hardware reconfiguration.

Important features of the CMX7164 include direct I/Q analogue inputs and outputs, channel estimation and equalisation, pulse shape filtering, RAMDAC capability for ramping PA power control, and a C-BUS SPI compatible serial interface to the host microcontroller. Four auxiliary ADCs with six selectable input paths, four auxiliary DACs and two programmable system clock outputs are provided to aid design and operational flexibility.

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