The Si2494/39 ISOmodem
參數(shù)資料
型號(hào)： SI2494-A-GM
廠商： Silicon Laboratories Inc
文件頁(yè)數(shù)： 10/70頁(yè)
文件大?。?/td> 0K
描述： IC ISOMODEM 56KBPS 38-QFN
標(biāo)準(zhǔn)包裝： 364
系列： *
Si2494/39
18
Rev. 1.0
4. Functional Description
Figure 7. Functional Block Diagram
The Si2494/39 ISOmodem is a complete embedded modem chipset with integrated direct access arrangement
(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.
UART
Interface
Parallel
Interface
DS
P
DAA
Interface
PLL
Clocking
XTI
XTO
CLKOUT
C1
To Phone
Line
AOUT
Data Bus
Co
nt
ro
lle
r
Si
30
18
/1
0
RXD
TXD
CTS
RTS
DCD
ESC
RI
CS
WR
RD
A0
D0-D7
Program Bus
EEPROM
Interface
EESD
EECLK
EECS
C2
SPI
Interface
MISO
MOSI
SCLK
INT
RESET
ROM
RAM
SS
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