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Multi Mode Data Modem

CMX7143


Features:

7143FI-1.x:
  • GMSK/GFSK Packet Data Modem
  • Bit Rates: 4k to 20k bps (2k to 20k sym/s)
  • Selectabe BTs: 0.5, 0.3, 0.25, 0.27
7143FI-2.x:
  • 4FSK Packet Data Modem
  • Bit Rates: 4k to 20k bps (2k to 20k sym/s)
7143FI-3.x:
  • FFSK/MSK Packet Data Modem
  • 1200 and 2400 baud Data-rates
Common to all products . .
  • Built on FirmASIC® Technology
  • Half-duplex Operation
  • Automatic Frame Sync. Detection
  • Automatic Preamble and Frame Sync. Insertion
  • Formatted and Raw Data Modes
  • Flexible Bit-rates
  • Two Auxiliary ADCs
  • Four Auxiliary DACs
  • Three Analogue Inputs
  • Carrier Sense
  • Automatic (RAMDAC) Control of Tx Hardware
  • Flexible Tx Interfaces:
    • I/Q Modulation
    • Two-point Modulation
  • C-BUS Serial Command/Data Interface
Applications:
  • Wireless Data Modems
  • M2M Applications
  • Point-to-Point Telemetry
  • Traffic Control and Vehicle Location Systems
Supply Requirement:
  • 3.0 to 3.6 V Power Supply

The CMX7143 is a unique, highly-flexible single IC product offering wide-ranging wireless data operations in one hardware package.

This unique way of operating means that you can produce an individual end-product platform operable to (currently) three different schemes. A saving in time, cost and materials.

Built on CML’s proprietary FirmASIC technology, this IC can be configured by a Function Image (FI) file to one of three individual functions:

  • GMSK/GFSK Packet Data Modem
  • 4FSK Packet Data Modem
  • FFSK/MSK Modem

Operation, in the host equipment, to alternative data schemes is achieved literally at the ‘press of a button’.
FirmASIC IC function and configuration is achieved by the loading of a compact Function Image file at start-up or when a change of data scheme is required.

Function Image files, which are downloadable from the CML website, can be easily 'swopped' in the field by the host µC to allow the system to operate to an entirely different (data) scheme.

The Function Image (FI)
This device utilises CML’s proprietary FirmASIC component technology.

On-chip sub-systems are configured by a Function Image: 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 an external EEPROM or from a host µController over the built-in C-BUS serial command/data interface.

Evaluation
The following PCB-based Evaluation Kits are available for use with this IC:

Block Diagram

CMX7143: a flexible multi-mode GMSK/GFSK, 4FSK and FFSK/MSK freeformat and packet data modem

Design Support Information

 

CMX7143 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.
[Function Image Loading Options]


For 7143FI-1.x
Q. I am about to evaluate the 7143FI-1.x (GMSK/GFSK Modem) using the PE0401, what recommendations can you give me?

A. Operation is straightforward when following the instructions in the user manuals and FAQs, however a modest modification to the PE0401 is recommended.
The baseband signal requires a Tx-to-Rx channel with a relatively flat frequency response. To achieve this with the PE0401 kit from the default build will require the removal and replacement of certain capacitors.

  • C20 and C21 on the Mod1 and Mod2 paths should be removed
  • C5, C8 and C9 at the discriminator input must be replaced by a zero ohm link
  • The removal of C16, C17 and C18 may also benefit performance
  • All other components may remain the same

For 7143FI-2.x
Q. I am about to evaluate the 7143FI-2.x (4FSK Modem) using the PE0401 what recommendations can you give me?

A. Operation is straightforward when following the instructions in the user manuals and FAQs however a modest modification to the PE0401 is recommended.
The baseband signal requires a Tx-to-Rx channel with a relatively flat frequency response. To achieve this with the PE0401 kit from the default build will require the removal and replacement of certain capacitors.

  • C20 and C21 on the Mod1 and Mod2 paths should be removed
  • C5, C8 and C9 at the discriminator input must be replaced by a zero ohm link
  • The removal of C16, C17 and C18 may also benefit performance
  • All other components may remain the same
 
 
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