Multi-mode wireless data modem updated with 8-FSK modulation

4th March 2014
Nat Bowers

Further enhancing the company's flexibility in addressing existing market requirements and encompassing future market need for higher-speed data, CML Microcircuits has released a major update on the CMX7164 Multi-mode Wireless Data Modem that includes the addition of 8-FSK Modulation.

8-FSK constant envelope modulation provides increased data throughput compared to 4-FSK for given channel bandwidths of 6.25kHz, 12.5kHz and 25kHz and can achieve up to 40kbps over a 25kHz channel. A range of coding schemes is included that can be selected based on individual channel performance and requirements. An Auto Modulation Detection mode 'AutoModDetect' is also provided, enabling backward compatibility with existing 4-FSK systems.

The CMX7164 Multi-mode Wireless Data Modem is a half-duplex device currently supporting 4/16/64 QAM, 2/4/8 FSK and GMSK/GFSK modes in multiple channel spacings, under host control. Robust flexible packet data structures including forward error correction and raw data modes are available, supporting user-requirements covering a wide range of applications.

An integrated analogue interface supports direct connection to zero IF I/Q radio transceivers with few external components; no external codecs are required. Intelligent auxiliary ADC, DAC and GPIO sub-systems perform valuable functions and minimise host interaction and host I/O resources. Two synthesised system clock generators develop clock signals for off-chip use.

The C-BUS/SPI master interface expands host C-BUS/SPI ports to control external devices. 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 feature set.

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