CH1782A 데이터 시트보기 (PDF) - Cermetek Microelectronics
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CH1782A Datasheet PDF : 19 Pages
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CH1782A
Family of Ultra Small Modem Modules V.22bis-2400bps
INTRODUCTION
The CH1782A Ultra Small Modem Module is a pin
compatible and functional replacement for the
CH1782. The CH1782A replaces the CH1782 due to
the obsolescence of the modem chip set in the
CH1782 by the manufacturer. The CH1782A is
recommended as a replacement for the CH1782, but
not for new designs. The CH1782A is a small, full
function 2400bps modem component that is FCC Part
68 approved. It offers a fast and easy way to integrate
a modem into an OEM product while utilizing a
minimum amount of PCB space and having only an
0.50” height. The modem component has two
interfaces, a CCITT V.24 serial interface that can be
routed directly to a UART and a Tip and Ring signal
which goes directly to an RJ-11 jack for telephone line
connection. The modem can be controlled with
industry standard AT commands and, hence, is
compatible with available industry communication
software.
The CH1782A supports asynchronous operations at
2400bps, 1200bps, and 300bps to Bell and CCITT
standards.
The resident telephone line interface, or Data Access
Arrangement (DAA), while being FCC approved, is
also Canadian DOC approvable and can be approved
in other countries that require 1000 VAC isolation.
The CH1782A operates off a regulated single 5-volt
supply. The low power operation and automatic
standby mode male it ideal for portable equipment,
which is further enhanced by its small size.
DESCRIPTION OF FUNCTIONAL BLOCKS
AND DISCUSSION OF BASIC OPERATIONS
Figure 1 is a functional block drawing of the CH1782A.
The CH1782A is a highly integrated, full-function
modem, comprised of a modulator/demodulator,
controller, and a FCC Part 68 approved telephone
PSTN line interface.
Modulation/Demodulation and Modem Controller.
These functions are provided by a monolithic modem
integrated circuit. This IC has built-in facilities to
accommodate integrated AT command control and
contains the necessary resident interfaces for general
communication and routing to the DAA.
FEATURES
• Supports Standards CCITT V.22bis, V.22, Bell
212, and Bell 103
• FCC Part 68 approved and DOC approvable
• AT Command structure – with extensions
• 1000 VAC isolation barrier
• Single 5 volt operation
• Low power operation with automatic reduced
power standby mode
• Automatic adaptive and fixed compromise
equalization
• Size: 1.0”X1.25”X0.53”
Figure 1. CH1782A Functional Block Diagram.
Telephone Line Interface or DAA. The CH1782A is
designed to meet North American telephone standards
as set by FCC Part 68 and DOC. The telephone line
interface is designed to meet 1000 VAC and 1500 volt
peak surge isolation, among other parameters. As
such, it will meet U.S. and Canadian requirements, as
well as other international requirements that specify
that level of isolation. Cermetek manufacturers other
modules that meet more stringent international
requirements.
The CH1782A is pre-approved to FCC Part 68; and is
shipped from the factory with a label that indicates the
registration number and ringer equivalent affixed to the
unit. An additional label is provided that should be
prominently displayed on the outer system enclosure.
As with most countries, except the U.S., Canada
requires submission of the product containing the
CH1782A for DOC approval. This can be done by
2002 Cermetek Microelectronics, Inc.
Page 1
Document No. 607-0009 Revision C (01/03)
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