DAA-4400
I.R.T. Communications Pty Ltd | www.irtcommunications.com
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Revision 02
GENERAL DESCRIPTION
The DAA-4400 is designed to provide a solution to most AES/EBU digital audio signal distribution requirements.
The DAA-4400 will operate at AES sample rates from 34 to 54 kHz and may be used with non-AES digital signals
that have a net zero DC content.
Whilst analogue VDA's may be used for 75 Ohm AES signals, the digital circuitry of the DAA-4400 offers the
advantage of restoring the signal rise and fall times and output level without the need to manually adjust gain and
compensation controls.
A choice of rear assembly is available for either 110 Ohm or 75 Ohm use. No changes are required to the main DA
to convert between the two output types. The input includes both 110 Ohm and 75 Ohm input connectors and is
link selectable on the main PCB.
An optional SNMP (Simple Network Management Protocol) plug-in module is available for monitoring when used
in an IRT frame fitted with SNMP capability.
The DAA-4400 is designed to fit IRT’s standard 1RU and 3RU Eurocard frames and may be used alongside any other
of IRT’s analogue or digital Eurocards.
Standard features:
•
8 outputs.
•
75 and 110 Ohm inputs.
•
Choice of 75 or 110 Ohm outputs by changing rear connector assembly.
•
Front panel monitoring output.
•
All inputs and outputs transformer coupled.
•
Digital circuit re-shapes output and restores level.
•
No cable compensation adjustments required.
•
Optional plug-in SNMP monitoring module.
BLOCK DIAGRAM DAA-4400 SIGNAL PATH
75 Ohm
110 Ohm
8 x
75 Ohm
or
110 Ohm
SNMP
