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Digital PMR (DPMR) Processors

CMX7131 and CMX7141


Features:

  • Multi-standard Digital PMR Processor Including Analogue PMR Operations
  • Automatic Frame Sync Insertion and Detection (AFSD)
  • Two Auxiliary ADCs
  • Four Auxiliary DACs
  • Three Analogue Inputs with Programmable Gain
  • Auxiliary C-BUS Interface to CMX608 or CMX618
  • Tx Outputs for Two-Point or I/Q Modulation
  • Soft Decision Decoding Option
  • Two RF Synthesisers (CMX7131 Only)
  • Vocoder Connectivity, Management, Control and Data Transport
  • RALCWI/TWELP and Third-party Vocoders

Applications:

  • Digital PMR Systems
  • dPMR
  • dPMR446
  • dPMR Mode 1/2/3
  • ARIB STD-T98 DCR
  • ARIB STD-T102
  • NXDN
  • Analogue PMR
  • Dual/Multi-mode Radios

Supply Requirement:

  • 3.0 to 3.6 V

The CMX7131 and CMX7141 are half-duplex processor IC platforms built on FirmASIC® technology that are suitable for use in multi-standard digital PMR (DPMR) and dual-mode (analogue/digital) systems.

FirmASIC® component technology allows on-chip sub-systems to be reconfigured by a Function Image™ (FI): this is a data file that is uploaded during device initialisation that defines the device's function and feature set.

Dual mode and multi-mode digital PMR radios can now be developed based on a single radio platform conforming to a number of  digital PMR systems/standards all with full analogue PMR backward compatibility.

The Ultimate FDMA Digital Radio Chipset

A number of the Function Images now support direct connection to CML’s CMX994 Direct Conversion ReceiverThe combination of the CMX7131/7141 and CMX994 enables the highest integration, multi-standard FDMA digital/analogue PMR radio, to be realised.  The CMX7131/7141 and CMX994 together address the market requirements for: Low power operation, small size, low cost, flexibility and high performance.

Vocoder Support

A number of Function Images manage voice and data systems autonomously with the CMX618 RALCWI  (Robust Advanced Low Complexity Waveform Interpolation) Vocoder, CMX7262 TWELP (Tri-Wave Excited Linear Prediction) and other third-party Vocoders.

This minimises host microcontroller interactions enabling the lowest overall operating power and therefore the longest battery life for a digital PMR radio.  Third–party Vocoders are also supported in a data transport mode of operation.

Systems Supported   

Description

Function Image

Rx
LD

Rx
CMX994
DCRx

Tx
Two-point

Tx
I/Q

dPMR446 (Mode1/2)

7131/7141FI-1.x

Y

-

Y

Y

ARIB STD-T98 (DCR)

7131/7141FI-2.x

Y

Y

Y

Y

NXDN Air Interface Protocol

7131/7141FI-3.x

Y

Y

Y

Y

dPMR446 (Mode 1/2) and Analogue PMR

7131/7141FI-5.x

Y

-

Y

Y

ARIB STD-T102 Part 2

7131/7141FI-6.x

Y

Y

Y

Y

dPMR Mode 1, 2 and 3

7131/7141FI-7.x

Y

Y

Y

Y

Analogue PMR I/Q Processor

7131/7141FI-8.x

Y

Y

Y

-

Analogue Two-way Radio

7031/7041FI-1.x

Y

-

Y

Y

The CMX7131 and CMX7141 also include two auxiliary ADCs with four selectable inputs and four auxiliary DAC interfaces (with an optional RAMDAC on the first DAC output, to facilitate transmitter power ramping).

Additionally the CMX7131 features two on-chip RF synthesisers, with easy Rx/Tx frequency changeover.

The devices have flexible powersaving modes and each are available in both LQFP and VQFN packages.

dPMR446 (Mode1/2)

7131/7141FI-1.x implements a half-duplex 4FSK modem and a large proportion of the dPMR Air Interface, Data Link and Call Control layers. In conjunction with a suitable host, Vocoder and RF section, a compact, low cost, low power digital PMR radio conforming to ETSI’s dPMR standard TS 102 490 can be realised.

ARIB STD-T98 (DCR)

7131/7141FI-2.x implements a half-duplex 4FSK modem and a large proportion of the DCR Air Interface, Data Link and Call Control layers. In conjunction with a suitable host, Vocoder and RF section, a compact, low cost, low power dPMR radio conforming to ARIB STD- T98 Digital Convenience Radio standard can be realised.

NXDN™

7131/7141FI-3.x implements the NXDN™ Air Interface Phyisical layer (layer 1), the Data Link layer (layer 2) plus a host of advance features in support of the overall radio. In conjunction with a suitable host controller, Vocoder and RF section, a compact, low cost, low power digital PMR radio conforming to the NXDN™ standard can be realised.

dPMR446 (Mode1/2) and Analogue PMR

7131/7141FI-5.x provides a dPMR446 (Mode1/2) operation as defined in 7131/7141FI-1.x and a subset of Analogue PMR functions  (Audio processing and sub-audio signalling) enabling dual mode analogue/digital operation without changing Function Image.

ARIB STD-T102 (Part 2)

7131/7141FI-6.x implements a half-duplex 4FSK modem and a large proportion of the ARIB’s T102 Air Interface, Data Link and Call Control layers. In conjunction with a suitable host, Vocoder and RF section, a compact, low-cost, low-power digital PMR radio conforming to ARIB STD-T102 standard can be realised.

dPMR Mode 1, 2 and 3

7131/7141FI-7.x  implements a half-duplex 4FSK modem and a large proportion of the professional dPMR (peer-to-peer, repeater and trunking) Air Interface, Data Link and Call Control layers. In conjunction with a suitable host, Vocoder and RF section, a compact, low-cost, low-power digital PMR radio conforming to the ETSI dPMR professional PMR radio standard TS 102 658 can be realised.

Analogue PMR

The CMX7131 and CMX7141 can be configured to operate as an Analogue Two-way Radio Processor using the Function Image form the CMX7031/41 Analogue Two-way Radio Processors (7031/7041FI-1.x). This ability to upload an analogue PMR Function Image offers true 'dual-mode' capability to a radio.

Function Image 7131/7141FI-8.x provides optimised analogue PMR performance and direct connection to CML’s CMX994 Direct Conversion Receiver IC.

System Diagram

CMX7131/7141 system diagram

NXDN™ is a trademark of JVC KENWOOD and ICOM
Function Image™ and FirmASIC® are trademarks of CML Microsystems Plc

Design Support Information

 

CMX7131/7141 FAQ
 

Function Image Loading Options
Q. I am about to start a design using one of your FirmASIC® based products, what is the most suitable method of storing the associated Function Image™ in my project?

A. Our FirmASIC® based devices require a Function Image™ to configure their on-chip sub-systems.
This is a data file that is uploaded during device initialisation and defines the device's function and feature set.

The Function Image™ can be loaded automatically from external serial EEPROM via a dedicated SPI bus or from a host µController over the built-in C-BUS serial interface.It is also possible with two specified memory devices to update the serial memory stored Function Image™ via the C-BUS and SPI interface.

CML supplies a dedicated Thick Stub Function Image™ to enable this capability. The linked flow diagram is an aide-memoir in that it makes it plain what is possible when choosing the most suitable method of storing a Function Image™ for your project.

 
 
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