SI2400URT-EVB Datasheet, PDF (1/22 Pages) Silicon Laboratories – Audio connector for call monitoring

Si2400URT-EVB
EVALUATION BOARD FOR THE Si2400 WITH A
UART INTERFACE
Description
The Si2400URT-EVB evaluation board provides the
system designer an easy way to evaluate the Si2400
ISOmodem™. The Si2400URT-EVB consists of a
motherboard with a power supply, an RS-232 interface,
other ease-of-use features, and a complete removable
modem module on a daughter card. (A functional block
diagram of the Si2400URT-EVB is shown below.) The
Si2400 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 two 16-pin
small outline (SOIC) packages, the Si2400 ISOmodem
eliminates the need for a separate DSP data pump,
modem controller, memories, analog front end (AFE),
isolation transformer, relays, opto-isolators, and a 2- to
4-wire hybrid. The Si2400 is ideal for embedded modem
applications due to its small board area, controller-
based architecture, low power consumption, and global
compliance. The Si2400URT-EVB provides an RJ-11
jack and a DB9 connector for interfacing the
Si2400URT-EVB to the phone line and a PC or data
terminal serial port. This allows the Si2400 ISOmodem
to operate as a serial modem for straightforward
evaluation. To evaluate the Si2400 ISOmodem in an
embedded system, the daughter card can be used
independently or with the motherboard. A direct access
header (JP3) is available on the motherboard to bypass
the RS-232 transceivers and connect the Si2400
ISOmodem directly to a target system. The EVB also
provides test points for access to the analog input and
analog output. These interfaces can be used to
evaluate the Si2400 PCM and voice modes. Given that
any of the GPIO pins may be used as an audio input,
the EVB provides access to all GPIO pins.
Power is supplied through a screw terminal (J3) or a
standard 2 mm power jack (J4). An on-board rectifier,
filter, and voltage regulator allow the power input to be
7.5 V–13 V ac or dc (either polarity). The Si2400URT-
EVB can drive an external speaker for call monitoring or
a piezoelectric speaker can be mounted directly on the
board in the space provided.
Features
The Si2400URT-EVB includes the following:
Dual RJ-11 connection to phone line
Serial interface to PC
Audio connector for call monitoring
Direct access to Si2400 for embedded application
evaluation
Easy power connection to common 7.5 V–13.5 V
power supplies
9 V ac adaptor
Simple installation and operation
Functional Block Diagram
9 V dc at 300 mA ac
Adaptor
Audio
Out
Audio
Amplifier
7.5–13.5 V dc or
peak ac
Rectifier
Filter
Voltage
Regulator
5V
UART
DB9
RS-232
Transceivers
3.3 V
Direct
Access HDR
Daughter Board Boundary
Interface
Selection
Jumpers
AOUT
Si2400
RESET XTALO XTALI
Si3015
Interface
Circuit
Push Button
Reset
Power-On
Reset
Phone
Line
RJ-11
Rev. 0.6 10/01
Copyright © 2001 by Silicon Laboratories
Si2400URT-EVB-06