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DE8781

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DE8781 数据手册

DE8781/DE8782

CMLMicrocircuits

COMMUNICATION SEMICONDUCTORS

User Manual

UM8780/3 November 2003

Advance Information

Features

· CMX878-based modem Reference Design

· Line Powered

· ‘AT’ Command Compatible Firmware

· Opto-isolated Serial Port

· Transformer-less DAA

· FCC68 or TBR21 versions

· Supplied with PCB Layout Data

· On-board FLASH PIC Microcontroller

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. ‘AT’ 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).

ã 2003 CML Microsystems plc

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型号	品牌	获取价格	描述	数据表
DE8782	CMLMICRO	获取价格	High Resolution Circuit Diagrams for DE8781 and DE8782
DE8W8P500G00LF	AMPHENOL	获取价格	D Type Connector, 8 Contact(s), Male, Solder Terminal, Locking
DE8W8P500G40LF	AMPHENOL	获取价格	D Type Connector, 8 Contact(s), Male, Solder Terminal, Locking
DE8W8P500H00LF	AMPHENOL	获取价格	D Type Connector, 8 Contact(s), Male, Solder Terminal, Locking
DE8W8P500H30LF	AMPHENOL	获取价格	D Type Connector, 8 Contact(s), Male, Solder Terminal, Locking
DE8W8P500H40LF	AMPHENOL	获取价格	D Type Connector, 8 Contact(s), Male, Solder Terminal, Locking
DE8W8P500M00LF	AMPHENOL	获取价格	D Type Connector, 8 Contact(s), Male, Solder Terminal, Locking
DE8W8P500M30LF	AMPHENOL	获取价格	D Type Connector, 8 Contact(s), Male, Solder Terminal, Locking
DE8W8P500M40LF	AMPHENOL	获取价格	D Type Connector, 8 Contact(s), Male, Solder Terminal, Locking
DE8W8P543A00LF	AMPHENOL	获取价格	D Type Connector, 8 Contact(s), Male, Solder Terminal, Locking