ISOMODEM - Silicon Laboratories
Description
Si2457/Si2434/Si2415
V.
9 0 , V.
3 4 , V.
3 2 B I S I S O M O D E M ® W I T H I N T E GR A T E D G L O B A L D A A
Features
Data modem formats
ITU-T, Bell 300 bps up to 56 kbps V.
21,V.
22, V.
29 Fast Connect V.
42, V.
42bis, MNP2-5 Automatic rate negotiation
Type I and II caller ID decode No external ROM or RAM required UART or parallel interface AT command set support
Applications
Set-top boxes Point-of-sale terminals ATM terminals
Integrated DAA
Over 5000 V Capacitive isolation Parallel phone detect Globally-compliant line interface Overcurrent detection
27 MHz clock input 3.
3 V power Firmware upgradeable EEPROM interface
Digital video recorder Digital televisions Remote monitoring
Description
The Si2457, Si2434, and Si2415 are complete two-chip modems ranging in speed from 56,000 bps to 14,400 bps.
The ISOmodem® chipsets utilize Silicon Laboratories’ third-generation direct access arrangement (DAA) to provide a globally-programmable telephone line interface with an unparalleled level of integration.
By sharing the same line-side device, a single design can be used in all countries and for all modem speeds.
Available in two small packages, these compact solutions eliminate the need for a separate DSP, modem controller, codec, isolation transformer, relay, opto-isolators, clocking crystal, and 2–4 wire hybrid.
The ISOmodem provides conventional data formats with connect rates of up to 56,000 bps, full-duplex, over the Public Switched Telephone Network (PSTN).
These devices are ideal for embedded modem applications due to their flexibility, small footprint, and minimal external component count.
Functional Block Diagram
CLKIN/XTALI
XTALO
CLKOUT
RXD TXD CTS RTS DCD ESC
RI
INT
PLL Clocking
Serial Interface
RAM/ROM Data Bus
Microcontroller DSP
CS WR RD
A0 D0-D7
RESET
Parallel Interface
DAA Interface
AOUT
To Phone Line
ISOB
Si3018
Ordering Information
This data sheet is valid only for those chipset combinations listed
on page 68.
Pin Assignments
Si2457/34/...
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