Wireless data modulator simplifies design for licenced frequency bands

August 22, 2019 //By Julien Happich
modulator
CML Microcircuits’ CMX7146 is a flexible data modulator that simplifies the design of transmit-only solutions using BPSK (binary phase shift keying) and differential BPSK modulation (also referred to as PRK, phase reversal keying, or 2PSK).

The CMX7146 generates precise baseband analogue in-phase and quadrature signals with programmable signal filtering. This generates with high accuracy a signal ready for transmission and suitable for up-conversion to an RF carrier of the user’s choice. The chip provides extensive configuration in terms of data rates and modulation shaping, while enabling users to customize transmit frequencies and channel bandwidths using an external RF modulator.
The CMX7146 supports raw (bits in, modulation data out) and preloaded (messages in, modulation data out) transmissions and features a transmit trigger input to enable precisely timed data transfers. A power amplifier ramping DAC can be employed to control transmission bursts, which can be synchronized as part of the transmit sequence. To increase flexibility in sensor interfacing and IIoT solutions, the CMX7146 integrates low power analogue to digital converters and four GPIO interfaces. The new device is based on CML's proven FirmASIC technology, where device functionality is defined by a small configuration file that is loaded at power-up. This increases the flexibility and lifetime of an end-product, by taking advantage of future functionality upgrades provided by CML, such as alternative modulation schemes or over air protocols. The CMX7146 operates from a single 3.3V supply and comes in a space-saving 48 lead QFN package.
CML Microcircuits – www.cmlmicro.com


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