Rabu, 23 Juni 2010

CML Micro - Wireless data modem IC provides 4/16/64-QAM baseband functions

The launch of the CMX7163 wireless data QAM modem IC has been announced by CML Microcircuits. The CMX7163 provides 4/16/64-QAM baseband modem functions in a single chip, replacing the current need for user programmed DSP plus codec ICs.

This development includes high dynamic range analogue signal capturing, digital baseband filters, auxiliary codecs, clock generator, and I/O functions all designed to lower total BOM cost and chip count. The high level of total integration reduces technical risk and time to market.

The device is a complete baseband modem system delivering high performance and high spectral Powerstax

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QAM 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, which is suitable for 6.25kHz, 12.5kHz and 25kHz bandwidths, operates up to 96kbps in 25kHz bandwidths, featuring channel estimation and equalization. The device is suitable for interfacing to superheterodyne receivers (e.g. CMX992) or direct conversion designs (e.g. CMX994) providing performance compatible with stringent regulatory standards such as EN 301 166, EN 300 113 and EN 302 561. The transmitter interface is compatible with the proven CML Cartesian loop technology (CMX998).

The device utilises 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 CMX7163 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 include direct I/Q analogue inputs and outputs; automatic DC offset compensation, pulse shape filtering, a RAMDAC capability for PA ramping control, and a C-BUS (SPI compatible) serial interface to the host microcontroller. Four auxiliary ADCs and DACs, two programmable system clock outputs, 4 GPIO and a separate C-BUS (SPI) interface to allow automated control of the radio section. Other special features optimised for high performance modems include carrier sensing, transmit burst timing and automated control of receiver AGC (when using CMX992 or CMX994).

The CMX7163 operates at 3.3V supply and includes selectable power saving modes. It is available in 64-VQFN and 64-LQFP packages, says the company.

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