Datasheet > DE8661

DE8661

更新时间： 2024-11-04 22:29:27

品牌	Logo	应用领域
CMLMICRO		调制解调器插座
页数	文件大小	规格书
21页	1000K
描述
V.22bis User Manual for a socket modem

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DE8661 数据手册

DE8661

V.22bis User Manual

for a "socket modem"

CMLMicrocircuits

COMMUNICATION SEMICONDUCTORS

UM8661/4 June 2004

Provisional Issue

1.0

Features

• CMX866-based socket modem Reference Design • FCC68 or CTR21 DAA

• Fully Isolated 2-Wire Line Interface

• Single 3V or 5V dc power supply

operation

• Opto Isolated Ring Detect Circuitry and

• Break-off PCB sections support

OptoMOS Hook Relay

'desktop' and 'socket' modem use

• Integral AT Command Set with 'Fast Connect'

• PC Controlled via Terminal Emulator

• PCB layout data provided

1.1

Brief Description

The DE8661 Demonstration Board is a reference design for the CMX866 V.22 bis AT command modem

IC. The main "socket modem" section contains the CMX866 and associated components in addition to

the line interface components. Attached to the main section are two break-off sections which contain a 9-

pin D type socket for PC serial communications, RJ11 line connector, supply voltage connector and a

hook-state LED. The CMX866 contains an on-chip µController, which interprets AT Commands issued via

a standard terminal emulator program running on a host PC or via an external µController.

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 can be operated at 3V or 5V dc, which must be

provided by an external, regulated power supply.

The PCB has been laid out for both CTR21 and FCC68 compliant DAA designs. However the

components fitted are for the simplified European/FCC68 design. Users wishing to convert to CTR21

should contact CML.

 2004 CML Microsystems Plc

12 3 4 5 6 7...21

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