Product description

The CMX7011 is a flexible, half-duplex, digital voice encryption processor that provides the digital advantage to conventional analogue two-way radios.

Digital voice scrambling is a key feature of the device, transmitting and receiving secure encrypted voice via an embedded robust data modem.

The device allows simple implementation and configuration within existing designs and is intended to be added to a radio via an accessory module or “feature socket”. The device is simple to control via a small, low-power microcontroller.

The CMX7011 offers good quality speech which is better than that of traditional analogue radios at the fringes of reception and, using the internal digital encryption algorithm, significantly higher levels of security are achieved.

The CMX7011 uses CML’s proprietary FirmASIC component technology, providing maximum flexibility with upgrade capability and a roadmap of future function enhancements.

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Devices are available through our distributors below:


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  • Mouser_logo
  • RFMW logo

Block diagram



  • Simple Radio Audio Path Connectivity
  • Real-time Digital Voice Encryption
  • Voice Store/Retrieve, Packet data
  • Air Interface Protocol
  • Instant Voice Capture
  • Flexible 256 User Addressing
  • Embedded RALCWI Vocoder
    Licence Included (Royalty Free)
  • Embedded Audio-band Modem
  • Small 48-pin LQFP/VQFN


  • Digital Voice Encryption on Analogue Radio
  • Wireless Door Entry/Gate Access
  • Analogue Radio Add-on
  • Digital Advantage for Analogue Radio

Power supply requirement

  • 1.8 V and 3.3 V

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Design resources


 Q. Can I connect the CMX7011 Digital Scrambler directly into a radio’s audio path?

A. Yes, that is the intended use of the CMX7011, however there are a number of considerations that need to be taken into account. To achieve optimum performance, radio specific interface circuitry may be required.

When the radio is in digital voice scrambler mode the radio’s audio path: ‘pre/de-emphasis’, ‘companding’, ‘VOX’ and any audio band filtering, should be turned off or compensated for with suitable filtering.

Group delay is another potential problem area that is radio dependant and may require compensation.

Q. How much memory do I need to reserve in my host Flash memory to store the CMX7011 Function Image™.

A.  Realistically we do not expect the CMX7011 Function Image™ to exceed 48kbytes however, the absolute maximum size is 64kbytes.

PE0101-7011 PE0101 The PE0101 Platform Evaluation Kit is designed to assist in the evaluation and application development of the CMX7x1x range of FirmASIC products. The kit is in the form of a populated PCB comprising a CMX7x1x IC and appropriate supporting components and circuitry. PE0101_Product_Preview







PE0003 PE0003 The PE0003 Evaluation Kit Interface Card is a global interface system for use with evaluation kits for CML’s new generation ICs, including FirmASIC™ based products. This greatly simplifies the approach to the evaluation and design-in process.


White Paper - Upgrading Analogue Radios with Digital Encryption Easily and Cost Effectively

Upgrading Analogue Radios with Digital Voice Encryption Easily and Cost Effectively

PE0101-7011 Board Schematics

PE0101-7011 Board-Schematics

C-BUS Guides

Guides to operation and interfacing

Digital Voice Encryption Demonstrator 1

Using 1 off PE0003 interface card and 1 off PE0101-7010 demonstration board and scripts

Digital Voice Encryption Demonstrator 2

Using 1 off PE0003 interface card and 2 off PE0101-7010 (CMX7011 demonstrator boards), one for Tx and one for Rx.

Digital Voice Data External Routing Demonstrator 3

Demonstration of external routing of digital voice data to and from an external host (Microcontroller).

Voice Store and Retrieval Demonstrator 4

Demonstration of voice storage and retrieval. Voice messages can be stored in the device’s memory and then played back.

Transmit and Receive Packet Data Demonstrator 5

Demonstration of the use of packet data provided by the device. Messages of different lengths can be sent and received.

Function Image load

A demonstration script to download a Function Image the CMX7011 via C-BUS. The Function Image must be downloaded from the CML Portal and be formatted . Contact CML Technical Support if a pre-formatted Function Image is not available.

Package: Q3

48-pin VQFN

Package: L4

48-pin LQFP

VQFN Design Guidance Notes

VQFN Design Guidance Notes

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