SI2494 Datasheet, PDF(1/70 Page) Silicon Laboratories – V.92 AND V.34 ISOMODEM WITH GLOBAL DAA

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SI2494 Datasheet, PDF (1/70 Pages) Silicon Laboratories – V.92 AND V.34 ISOMODEM WITH GLOBAL DAA

Si2494/39

V. 9 2 AND V. 3 4 I S O MODEMÂ® WITH G LOBAL D A A

Features

ï® Data modem formats

ï¬ï ITU-T, Bell

ï¬ï 300 bps up to 56 kbps

ï¬ï V.21,V.22, V.29 Fast Connect

ï¬ï V.44, V.42, V.42bis, MNP2-5

ï¬ï Automatic rate negotiation

ï¬ï V.92 PCM upstream

ï¬ï V.92 Quick connect

ï¬ï V.92 Modem on hold

ï® Type I and II caller ID decode

ï® No external ROM or RAM required

ï® UART, SPI, or parallel interface

ï® Flexible clock options

ï¬ï Low-cost 32.768 kHz oscillator

ï¬ï 4.915 MHz oscillator

ï¬ï 27 MHz clock input

ï® Integrated DAA

ï¬ï Over 6000 V capacitive isolation

ï¬ï Parallel phone detect

ï¬ï Globally-compliant line interface

ï¬ï Overcurrent detection

ï® AT command set support

ï® SMS / MMS support

ï® Firmware upgradeable

Applications

ï® Point-of-sale terminals

ï® Security

ï® EEPROM interface

ï® Commercial or industrial

temperature range

ï® DTMF detection/generation

ï® Si3000 Voice Codec Interface

ï¬ï Hardware support for mic,

speaker, and/or handset

ï¬ï Programmable voice filters,

limiters, and sidetone

ï¬ï Supports TBR-38, TIA/EIA-

4790 and other voice

standards

ï® Voice pass through with

compression

ï¬ï Supports telephone

answering machine, music

on hold, voice menus, etc

ï® Full-duplex speakerphone

support

ï¬ï Line echo cancellation

ï¬ï Acoustic echo cancellation

ï® Medical

ï® Remote monitoring

Description

The Si2494/39 ISOmodem is a full-featured ITU V.92/V.34-compliant modem that

provides connect rates of up to 56 kbps, full-duplex, over the public switched

telephone network (PSTN). Offered as a chipset with the Si2494/39 system-side

device and the Si3018 line-side device, the ISOModem utilizes Silicon

Laboratoriesâ patented direct access arrangment (DAA) technology to provide a

programmable telephone line interface with an unparalleled level of integration.

This compact solution eliminates the need for a separate DSP, modem controller,

codec, transformer, relay, opto-isolators, clocking crystal, and 2-4 wire hybrid. The

addition of the Si3000 voice codec supports a voice handset and/or full-duplex

speakerphone. Voice pass-through with optional compression supports tapeless

answering machine, music-on-hold, voice menus, etc. The Si2494/39 is ideal for

embedded modem applications due to its flexibility, small footprint, and minimal

external component count.

System Block Diagram

Host

CPU

Host Interface

ï· UART

ï· SPI

ï· Parallel

Si2494

System

Side

Si3018

Line

Side

Capacitive

Isolation Barrier

Global

DAA

BOM

Telco

Tip

Ring

Ordering Information

This data sheet is valid only for

those chipset combinations listed

on page 59.

Pin Assignments

GPIO1

FSYNC

CLKOUT

N/C

VDD

GND

VREG

SDI

SDO

EESDI

EESDO

EECS

4 Si2494/39 28

5 x 7 mm

QFN

13 14 15 16 17 18 19

GPIO25, D3

GPIO24, D4

ESC, D5

DCD, D6

N/C

VDD

GND

RTS, SS, D7

TXD, MOSI, WR

RXD, MISO, RD

CTS, SCLK, CS

GPIO11, A0

Si3018

QE 1

DCT 2

RX 3

IB 4

C1B 5

C2B 6

VREG 7

RNG1 8

16 DCT2

15 IGND

14 DCT3

13 QB

12 QE2

11 SC

10 VREG2

9 RNG2

Rev. 1.0 7/11

Si2494/39

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