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DE8781 Datasheet

  • DE8781

  • User Manual

  • 32頁(yè)

  • CMLMICRO

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CML Microcircuits
COMMUNICATION SEMICONDUCTORS
DE8781/DE8782
User Manual
Advance Information
UM8780/3 November 2003
Features
鈥?/div>
CMX878-based modem Reference Design
鈥?/div>
Line Powered
鈥?/div>
Transformer-less DAA
鈥?/div>
FCC68 or TBR21 versions
鈥?/div>
鈥楢T鈥?Command Compatible Firmware
鈥?/div>
Opto-isolated Serial Port
鈥?/div>
Supplied with PCB Layout Data
鈥?/div>
On-board FLASH PIC Microcontroller
1
Brief Description
The DE878x Demonstration Board is a reference design and evaluation tool for the CMX878 V.22bis
modem plus DAA IC. Transformer-less DAA, line power extraction and ring detection circuits are
implemented on-board in accordance with CMX878 data sheet recommendations. An RJ11 line
connector is included. The DE8781 is designed for use in U.S. (FCC68) and the DE8782 is designed for
use in Europe (TBR21).
Additionally, a Flash PIC Microcontroller is included with evaluation firmware. There is an opto-isolated
serial link with a 9-pin D-type socket for PC serial communications. The opto-isolators provide a safety
barrier between the line side and a PC. 鈥楢T鈥?Commands are used to control the demonstration board via
a standard terminal emulator program running on a host PC.
Although line powered, the board can be re-configured to enable it to be powered locally from a battery or
isolated power supply. The PIC can be re-programmed in situ, via connector, J6, which provides the
necessary connections to proprietary programming tools (not supplied).
漏
2003 CML Microsystems plc

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