24-pin Si2435 + Si3018 ISOmodem

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Lead Time 26 weeks
Unit Price:$117.65
Minumum Qty: 1
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The Global Voice ISOmodem EVB evaluation board provides the system designer with an easy way of evaluating the ISOmodem®. The Voice ISOmodem EVB consists of a motherboard with a complete removable daughter card.

The Voice ISOmodem is a complete controller based modem chipset with an integrated and programmable direct access arrangement (DAA) that meets the global telephone line requirements. It is available in a 24-pin or 38-pin system side device and a 16-pin line side device. The hardware versions at the time of publication are:

• Voice Mother Board Si24xxVMB Rev 2.0
• Modem Daughter Card Si24xx2G-DC Rev 2.0
• Modem Daughter Card Si24xx2G-QFN38-DC Rev 1.0

The voice daughter card is populated with the correct ISOmodem system side chip (Si2494/39/38/37/36/35/29/19/18/17) and the correct line side DAA chip, the Si3018 to suit the voice applications.

The ISOmodem eliminates the need for a separate DSP data pump, modem controller, memories, codec, isolation transformers, relays, opto-isolators and a 3-4 wire hybrid. The ISOmodem is ideal for embedded modem and voice applications due to its small board area, controller based architecture, low power consumption and global compliance.

An onboard 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 (J8) or a standard 2 mm power jack (J9). Alternatively, power can be supplied through the USB interface (whether the USB or RS232 interface is used).

The Power Source Selection in automatic, while the signaling port is selected by a jumper (JP23).

The evaluation board audio power amplifier can drive an external speaker for either call progress monitoring or speakerphone function. A small onboard speaker, suitable for call progress monitoring, is installed.

Please note that fax modem versions listed in the title require a software driver in order to implement fax send/receive functionality. The driver must be compliant with the Silicon Labs ISOmodem and with applicable ITU-T standards (e.g., T.30, T.31, T.4 and T.6).

Symmetry Electronics is an authorized Silicon Labs distributor.


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Socketed module with the modem chipset
USB or asynch RS232 Serial Interface
RJ11 connection to the phone line
Onboard relay-excludable RJ11 connection
RS232 and USB interface to the PC
Direct access to the ISOmodem signals for embedded system evaluation
Power from a provided 8.513.5 V dc power supply or from the USB port
Handset connector (J1)
Onboard hookswitch
External hookswitch connector
Jumper matrix that allows any handset wiring scheme to work with this board
Onboard speakerphone microphone
RCA jack connector to an optional off-board speakerphone electret microphone
Selectable and adjustable electret power supplies for both handset and speakerphone microphones
Onboard 300 mW audio power amplifier (into a 4 O load) for driving either onboard or external speaker.
Onboard voice coil driven loudspeaker for call monitoring
LED display of all RS232 signals

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24-pin Si2435 + Si3018 ISOmodem
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24-pin Si2435 + Si3018 ISOmodem