Greater Robustness Against Security Breaches With Full-Duplex Audio


Its completely independent Tx and Rx signal paths mean that this IC is capable of full duplex operation

Recognising the growing need to protect communication systems from the threat of being compromised by unauthorised parties, CML Microcircuits has introduced the CMX7158.

Based on the company’s proprietary FirmASIC® technology, this compact user-programmable scrambler IC is optimised for inclusion in multi-function audio systems, as well as handheld wireless/cellular equipment.


Maintaining elevated levels of audio quality, it can rapidly switch between clear and scrambled voice modes via a programmable frequency inversion point, with minimal delay being experienced.

Thanks to FirmASIC, a Function Image™ is generated in which the CMX7158’s functional parameters are defined. This is loaded to the system upon power-up/device initialisation – either from the system’s host microcontroller (across an SPI compatible interface) or through an attached serial flash memory.

Key applications for the CMX7158 include

  • Cellular radio voice scrambling accessories
  • Bluetooth headsets
  • Wired/wireless access control systems
  • Private and land mobile radio (PMR/LMR)
  • Legacy wireline telephony. Supplied in a space-saving 48-pin VQFN package, it supports ). The device features numerous analogue audio interfaces make integration into existing system designs very straightforward. To assist engineers during the development process, CML offers the PE0402 evaluation board to accompany the CMX7158.

Key Features

  • Low power operation (3.0V – 3.6V source, with power saving modes)
  • Dual-tone multi-frequency (DTMF) encode/decode, Selcall signalling and VOX detection on both channels
  • Capable of full duplex operation.

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