si2439-a-gm Silicon Laboratories, si2439-a-gm Datasheet - Page 18

• Manufacturer Part Number: si2439-a-gm
• Description: V.92 And V.34 Isomodem With Global Daa
• Manufacturer: Silicon Laboratories

Si2494/39
4. Functional Description
The Si2494/39 ISOmodem
(DAA) that provides a programmable line interface to meet global telephone line requirements. This solution
includes a DSP data pump, modem controller, on-chip RAM and ROM, codec, DAA, analog output, and a PLL
clocking generator.
The Si2494/39 accepts standard modem AT commands and provides connect rates up to 56/33.6/14.4/2.4 kbps full-
duplex over the Public Switched Telephone Network (PSTN). The Si2494/39 features a complete set of modem
protocols including all ITU-T standard formats up to V.92.
The Si2494/39 features a direct interface to the Si3000 voice codec. Itself a highly integrated device, the Si3000
provides a codec, mixer, digital gain control, microphone preamp, microphone bias generator, speaker driver, and line
in/out ports for use with external amplifiers. The Si3000 codec combined with the features of the on-chip DSP
supports a voice handset and/or full-duplex speakerphone including programmable levels, frequency response,
limiting/soft-clipping and sidetone generation. Voice pass-through with optional compression supports implementation
of a tapeless answering machine (TAM), music-on-hold, voice menus, etc.
The ISOmodem provides numerous additional features for embedded modem applications. The modem includes full
type I and type II caller ID detection and decoding for global standards, DTMF tone generation and detection, Short
Message Service (SMS), distinctive ring detection, and call progress monitoring via a PWM audio output. Call
progress monitoring is supported through standard result codes. The modem is also programmable to meet global
settings. Because the Si2494/39 ISOmodem integrates the DAA, analog features, such as parallel phone detect,
overcurrent detection, and global PTT compliance with a single design, are included.
18
®
is a complete embedded modem chipset with integrated direct access arrangement
CLKOUT
EECLK
RESET
D0-D7
EESD
EECS
MISO
MOSI
SCLK
RXD
DCD
TXD
CTS
RTS
ESC
WR
CS
RD
INT
A0
SS
RI
Figure 7. Functional Block Diagram
EEPROM
Interface
Interface
Interface
Interface
Parallel
UART
SPI
XTI
Clocking
PLL
XTO
Program Bus
Data Bus
Rev. 1.0
ROM
RAM
Interface
DAA
C1
C2
AOUT
To Phone
Line