CH1786 Datasheet, PDF (1/18 Pages) List of Unclassifed Manufacturers – CH1786 Family of Ultra Small 2400bps Modems

CH1786 Family of Ultra Small 2400bps Modems
INTRODUCTION
The CH1786 family of modems are a full function,
FCC Part 68 approved 2400bps modem. These
modems provide a fast, easy and flexible way to
integrate a modem into any OEM product while
utilizing the minimum amount of PCB space (1.01 ”x
1.27 ”x 0.52 ”). The CH1786 family only requires two
external interfaces: a CCITT V.24 serial interface that
can be routed directly to a UART, and a Tip and Ring
interface which goes directly to an RJ-11 jack for the
PSTN line connection. The CH1786 can be
controlled with industry standard AT commands and,
hence, is compatible with available industry
communication software.
All CH1786 modems support asynchronous operation
at 2400bps, 1200bps, and 300bps to both Bell and
CCITT standards. The resident PSTN line interface,
or Data Access Arrangement (DAA), while being FCC
approved, is also Canadian DOT approvable and can
be approved in other countries that require 1500VAC
RMS isolation requirements per UL 1950 Edition 3.
The CH1786 family of modems operate off a single 5-
volt supply. The low power operation and automatic
standby mode make these modems ideally suited for
portable equipment. In addition, their small physical
size affords maximum flexibility in equipment design.
FEATURES
• Supports Standards CCITT V.22bis,V.22,Bell
212,and Bell 103
• FCC Part 68 approved and DOT CSA CS-03 Part I
approvable
• UL 1950 and CSA C22.2 950 Listed
• UL File Number: E104957
• AT Command structure with extensions
• 1500 VAC RMS isolation barrier minimum, 2122V
peak surge protection minimum
• Single 5 volt operation
• Low power operation with automatic reduced power
standby mode
• Automatic adaptive and fixed compromise
equalization
• Size: 1.01 ”x 1.27 ”x 0.52 ”(nominal)
• NVRAM allows storage of custom configurations
and telephone numbers
CH1786 FAMILY
CH1786
NVRAM, Voice/ Inject,
Operating Temperature:
0°C to +70°C
Hermetic,
CH1786ET
NVRAM, Voice/ Inject, Hermetic,
Operating Temperature:
-40°C to +85°C
CH1786NH
Non-Hermetic, Operating
Temperature:
0°C to +70°C
Figure 1. Functional Block Diagram of CH1786.
The CH1786 comes with FCC Part 68 approval and is
shipped from the factory with an FCC Part 68 label
indicating the registration number and ringer
equivalent. This label should be prominently
displayed on the end product.
Figure 2. Voice/ Data Port Control
2003 Cermetek Microelectronics, Inc.
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Document No. 607-0004 Revision L1 (06/03)