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CH224ATF

Complete 2400 bps Modem Module

Cermetek Microelectronics 

CH224ATF

Complete 2400 bps Modem Module

INTRODUCTION

The CH224ATF is a complete FCC Part 68 pre-

approved, 2400 bps full function modem solution;

incorporating an on-board Data Access

Arrangement (DAA) in a small footprint, socket-

able packaging format (2.5” L x 1.0 W x 0.45” H).

This product is specifically designed for use as a

direct replacement for Conexant/Rockwell’s

SocketModem (serial TTL I/O option, Part No.

SF224ATF-H1-D5-A0-P1).

This modem provides a fast and convenient way

to integrate PSTN connectivity into any OEM

product while utilizing a small portion of PCB area.

The CH224ATF requires two external interfaces: a

CCITT V.24 serial interface that is routed directly

from the UART or UART interface, and a TIP and

RING interface, which is connected directly to a

conventional RJ-11 jack for the PSTN line

connection. The CH224ATF also has various

indicator and status lines to monitor operations or

to establish triggers. The CH224ATF modem is

controlled by industry standard “AT” commands

and is compatible with available industry

communication software.

The device supports asynchronous operation at

2400 bps, 1200 bps, and 300 bps to both Bell and

CCIT standards. The resident PSTN line interface

is FCC Part 68 approved, and is also Canadian

DOC approveable, and can be approved in other

countries that require 1500VAC RMS isolation.

Figure 1. Functional Block Diagram of

CH224ATF

FEATURES

• FCC Part 68 pre-approved

• UL1950, 3rd edition listed

• 1500 Vrms isolation

• Complete solution: on-board DAA

• Data modes

- CCITT v.22 bis (2400 bps), V.22 (1200

bps)

- Bell 212A (1200 bps) and 103 (300

bps)

- Enhanced AT commands

• Group 3 fax modes

- V.29 (6900/7200 bps) transmit

- V.27 ter (4800/2400 bps) transmit and

receive

- V.21 Channel 2 (300 bps) transmit

and receive

• EIA-578 Service Class 1 commands

• V.42/MNP2-4 and V.42 bis/MNP5 support

without additional hardware

• Data/fax discriminator and auto answering

• Communications software compatible

• Serial asynchronous DTE interface

• NVRAM interface allows storage of two

user configurations and four 36-digit dial

strings

• Automatic adaptive/fixed compromise

equalization

• Programmable sleep mode

• Full-duplex data mode test capabilities:

Analog loop, local digital loop, and remote

digital loop

• Half-duplex fax mode test capabilities

• Automatic format/speed sensing

• Low power consumption (typical):

Interface

Serial TTL:

Operating

155mW

Sleep

35mW

• Single +5VDC power supply

TECHNICAL SPECIFICATIONS

General

The CH224ATF modem is a full-featured, self-

contained data/fax solution. External micro-

controller for data or fax control functions are

fully supported and controlled through the AT

command set.

2001 Cermetek Microelectronics, Inc.

Page 1

Document No. 607-0005 Revision B1 (05/02)

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