Rev. 0.6 2/05
Copyright © 2005 by Silicon Laboratories
Si2493/57/34/15/04-EVB
S i 2 4 9 3 / 5 7 / 3 4 / 1 5 / 0 4
G l o b a l I S O m o d e m - E V B
E v a l u a t i o n B o a r d f o r t h e S i 2 4 9 3 / 5 7 / 3 4 / 1 5 / 0 4
w i t h a U A R T I n t e r f a c e
Description
The global Si2493/57/34/15/04-EVB evaluation board
provides the system designer an easy way of evaluating
the Si2493/57/34/15/04 ISOmodem
®
. The Si2493/57/
34/15/04-EVB consists of a motherboard with a power
supply, an RS-232 and USB interface, other ease-of-
use features, and a complete removable modem
module on a daughter card. (A functional block diagram
of the Si2493/57/34/15/04-EVB is shown below.) The
Si2493/57/34/15/04 ISOmodem is a complete
controller-based modem chipset with an integrated and
programmable direct access arrangement (DAA) that
meets global telephone line requirements. Available as
a combination of one 16-pin small line-side device and
one 24-pin or 16-pin system-side device, the Si2493/57/
34/15/04 ISOmodem eliminates the need for a separate
DSP data pump, modem controller, memories, codec,
isolation transformer, relays, opto-isolators, and a 2- to
4-wire hybrid. The Si2493/57/34/15/04 is ideal for
embedded modem applications due to its small board
area, controller-based architecture, low power
consumption, and global compliance. The Si2493/57/
34/15/04-EVB provides an RJ-11 jack (for interfacing
the Si2493/57/34/15/04-EVB to the phone line), and
USB and RS232 serial ports for interfacing to a PC or
data terminal. This allows the ISOmodem to operate as
a serial modem for straightforward evaluation of the
Si2493/57/34/15/04. To evaluate the Si2493/57/34/15/
04 ISOmodem in an embedded system, the daughter
card can be used independently of or with the
motherboard. A direct access header (JP3) is available
on the motherboard to bypass the RS-232 transceivers
and connect the Si2493/57/34/15/04 ISOmodem
directly to a target system.
An on-board rectifier, filter, and voltage regulator allow
the power input to be 7.5–13 V ac or dc (either polarity)
supplied through a screw terminal (J3) or a standard
2 mm power jack (J4). Alternatively, power can be
supplied through the USB interface (whether the USB or
RS232 interface is used). The evaluation board can
drive an external speaker for call monitoring or the
piezoelectric speaker mounted directly on the board.
Please note that the PCM interface, parallel interface,
and EEPROM are available on the FT only. See
"1.7.EVB Part Numbers" on page 5 for ISOmodem EVB
options.
Features
The Si2493/57/34/15/04-EVB includes the following:
Dual RJ-11 connection to phone line
RS-232 and USB interface to PC
Piezoelectric speaker for call monitoring
Direct access to Si2493/57/34/15/04 for embedded
application evaluation
Easy power connection to common 7.5 V–13.5 V
power supplies or USB port.
9 V ac adaptor
Support for daisy chain operation with Si3000 voice
codec (FT only)
Simple installation and operation
EEPROM (FT only)
Functional Block Diagram
Si2493/57/34/15/04
Push Button
Reset
RESET
XTALI
XTALO
Si3018*
Interface
Circuit
RJ-11
phone
line
Audio
Amplifier
AOUT
Audio
Out
Direct
Access HDR
PCM
Interboard
Connector
PCM Data/
Control
Daughter Board Boundary
Power-On
Reset
Rectifier
Filter
7.5–13.5 V dc or
peak ac
RS-232
Transceivers
UART
DB9
Interface
Selection
Jumpers
Voltage
Regulator
3.3 V
5 V
9 V dc at 300 mA ac
Adaptor
USB
Connector
USB I/F
*Si3010 for Si2404
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