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CH1786

CH1786 Family of Ultra Small 2400bps Modems

Cermetek Microelectronics 

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.

Page 1

Document No. 607-0004 Revision L1 (06/03)

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