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SI2401

V.22BIS ISOMODEM® WITH LOW-COST DAA

Silicon Laboratories 

Si2401/Si3008

4. Functional Description

The Si2401 ISOmodem utilizing the Si3008 line-side

device is a complete embedded modem chipset with

integrated direct access arrangement (DAA). Available

in two small packages, this solution includes a DSP

data pump, modem controller, on-chip RAM and ROM,

codec, DAA, analog output, and 27 MHz clock input.

The modem accepts simple modem AT commands and

provides connect rates up to 2400 bps full-duplex over

the Public Switched Telephone Network (PSTN) with

V.42 hardware support through HDLC framing. To

minimize handshake times, the Si2401 can implement a

V.22-based fast connect. The modem also supports the

V.23 reversing protocol and standard alarm formats

including SIA.

This device is ideal for embedded modem applications

due to its flexibility, small footprint, and minimal external

component count. The Si2401 solution integrates a

silicon DAA using Silicon Laboratories’ proprietary

fourth-generation DAA technology. This highly-

integrated DAA can be programmed using the Si3008 to

meet international requirements and is compliant with

FCC, JATE, and other country-specific PTT

specifications as shown in Table 7.

The Si2401 is designed for rapid assimilation into

existing modem applications. The device interfaces

directly through a UART to a microcontroller. The

Si2401URT-EVB evaluation board connects directly to a

standard RS-232 or USB interface. This allows for

evaluation of the modem immediately upon powerup via

HyperTerminal or any standard terminal software.

In addition, the Si2401 has been designed to meet the

most stringent worldwide requirements for out-of-band

energy, billing-tone immunity, high-voltage surges, and

safety requirements.

Table 7. Country-Specific PTT Specifications

Country

Argentina

Kyrgyzstan

Armenia

Macao

Bahamas

Mexico

Bangladesh

Belarus

Moldova

New Zealand2

Bermuda

Paraguay

Brunei

Peru

Canada

Puerto Rico

Caribbean

Russia

Chile

Saudi Arabia

China

Colombia

Singapore

South Korea3

Costa Rica

Sri Lanka

Dominican Republic

Taiwan

Ecuador

Thailand

El Salvador

Tunisia

Georgia

UAE

Guam

Ukraine

Hong Kong

Uruguay

India

Uzbekistan

Indonesia

Japan1

USA

Venezuela

Kazakhstan

Vietnam

Kuwait

Yemen

Notes:

1. DCR exceeds 300 Ω; disclaimer required in

product documentation.

2. 600 Ω ac termination used; disclaimer required in

product documentation.

3. Additional components required to pass ringer

impedance specifications.

Rev. 1.1

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