BPSK wireless data modulator simplifies design for Frequency Bands

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CML Microcircuits Ltd, a global supplier of wireless data solutions, announced the introduction of the CMX7146, 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 a high accuracy signal ready for transmission and suitable for up-conversion to an RF carrier of the user’s choice.

 

Compared to other BPSK solutions, the CMX7146 offers greater flexibility, with better support for low speed BPSK modulation. It provides extensive configuration in terms of data rates and modulation shaping, while enabling users to customise transmit frequencies and channel bandwidths using an external RF modulator.

David Brooke, product manager for CML’s wireless voice and data products, said, “We are seeing a lot of interest in satellite IoT applications that monitor very remote equipment and send relatively small messages. For these kinds of functions, the new CMX7146 will give developers a quick and easy route to deploy a robust transmitter.”

BPSK is often used when durable, long range communication is needed. Its benefits include being relatively simple to demodulate and also extremely power efficient. These features have seen BPSK widely adopted for satellite applications (most recently in CubeSats), marine search and rescue (SAR) beacons and Industrial Internet of Things (IIoT) transmitters.

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 CMX7146 operates from a single 3.3V supply and is provided in a space-saving 48 lead QFN package.

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