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Demonstration Kit for CMX869B



  • Fully Isolated 2-Wire Line Interface
  • Opto Isolated Ring Detect Circuitry and OptoMOS Hook Relay
  • 'AT' Command Compatible Firmware
  • On-board FLASH PIC Microcontroller
  • PC Controlled via Terminal Emulator
  • DAA included
  • Single 3.3V dc power supply operation
  • Break-off PCB section
  • PCB layout data available


  • CMX869B-based Socket Modem Demonstration

Supply Requirement:

  • 3.3Vdc regulated power supply

The DE8691 Demonstration Board features the CMX869B V.32 bis modem IC in a "socket modem format" implementation.

The "socket modem" section also contains the line interface components and a Flash PIC µC.

Attached to the "socket modem" section are two break-off sections, which contain a 9-pin D type socket for PC serial communications, a Flash PIC programming connector, an RJ11 line connector and various LEDs for indicating signal activity.

AT Commands are used to control the demonstration board via a standard terminal emulator program running on a host PC.
Interfacing to the Demonstration Board can be via socket pins on the socket modem section, or via the connectors provided on the break-off sections. The board is operated at 3.3V dc, which must be provided by an external, regulated power supply.

PCB Image

DE8691: the CMX869B V.32 bis modem IC in a socket-modem implementation

Design Support Information

DE8691 Board Schematics DE8691BoardSchematics
DE8691 Support Files Support Files for the DE8691 Demonstration Kit
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