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CH1788

Surface Mount PLCC 2400bps Modem

Cermetek Microelectronics 

CH1788

Surface Mount PLCC 2400bps Modem

INTRODUCTION

The CH1788 modem has the smallest footprint and

lowest profile of any commercially available full

function, FCC Part 68 approved 2400bps modem.

Utilizing a 68 pin PLCC form factor and requiring a

minimum amount of PCB space (0.95”x0.95”x

0.255”), the CH1788 affords the design engineer

maximum flexibility. The CH1788 provides two

external interfaces: a CCITT V.24 standard 5 volt

serial interface for routing directly to a UART; and a

TIP and RING interface for connection to the PSTN

telephone line. The CH1788 is compatible with

available industry communication software or may be

controlled with software commands via an embedded

microcontroller.

The CH1788 modem supports asynchronous

operation at 2400bps, 1200bps, and 300bps to both

Bell and CCITT standards. Each device is FCC

approved and Canadian DOT approvable. An FCC

label is supplied. The CH1788 also meets UL 1950

Edition 3 requirements.

The CH1788 family of modems operate from a 5 volt

DC supply (3.3 volt devices are available by special

order). The combination of low power operation, zero

power standby mode and small form factor make the

CH1788 an ideal choice for portable equipment

applications.

• FCC Part 68 approved and DOT CSA CS-03 Part I

approvable.

• UL 1950 and CSA C22.2 950 Listed.

• AT Command structure.

• Speed buffered operation at: 9600, 2400, 1200

and 300bps.

• Call progress tone detection.

• Caller ID information.

• Line In Use and Priority Pick Up 911 feature

support with external circuitry.

• DTMF generation and detection resident on

CH1788.

• 5 volt operation/ 3.3 volt operation available.

• Low power operation with automatic reduced

power idle and zero power standby modes.

• Low profile PLCC surface mount packaging; fits

standard 68 pin PLCC socket.

• Size: 0.95” x 0.95” x 0.255”(nominal).

CH1788 FAMILY

CH1788

Operating Temperature:

0°C to +70°C

CH1788ET

Operating Temperature:

-40°C to +85°C

CH1788-3

3.3 volt Operation

Operating Temperature:

0°C to +70°C

CH1788-3ET 3.3 volt Operation

Operating Temperature:

-40°C to +85°C

Figure 1. Functional Block Diagram of CH1788.

FEATURES

• Supports data rate standards, CCITT

V.22bis,V.22, Bell 212, and Bell 103, Bell 202,

V.23.

• Fast connect handshaking.

2003 Cermetek Microelectronics, Inc.

Page 1

DESCRIPTION OF FUNCTIONAL BLOCKS

AND DISCUSSION OF BASIC OPERATIONS

Figure 1 contains a functional block drawing of the

CH1788. The CH1788 is a highly integrated, full-

function modem, comprised of a modulator/

demodulator, controller, and an FCC Part 68

approved telephone line interface.

Modulation/Demodulation and Modem Controller.

This function is provided by a monolithic modem

integrated circuit. The function is performed to CCITT

standards thereby making the CH1788 compatible

Document No. 607-0018 Revision A2 (07/03)

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