The chip enables greater robustness against security breaches with a frequency inversion audio scrambler supporting full duplex operation
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.
Furthermore, its completely independent Tx and Rx signal paths mean that this IC is capable of full duplex operation.
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 the C-BUS interface) or through an attached serial flash memory.
Dual-tone multi-frequency (DTMF) encode/decode, Selcall signalling and VOX detection on both channels are among the other main features encompassed.
Key applications for the CMX7158 include cellular radio accessories, Bluetooth headsets, wired/wireless access control systems, plus private mobile radio (PMR) and land mobile radio (LMR) radio hardware, as well as legacy wireline telephony.
Supplied in a 48-pin VQFN package, it supports low power operation (drawing from a 3.0V-3.6V source, with power conserving modes available).
The numerous analogue audio interfaces incorporated make integration into existing system designs straightforward.
To assist engineers during the development process, CML offers the PE0402 evaluation board to accompany the CMX7158