IRT AAC-3390 User manual

AAC-3390
I.R. T. Communications Pty L t d | www .i rtcommunication s. c o m
Revision 04
Analogue Stereo to AES Audio Converter
User Manual

AAC-3390
I.R. T. Communications Pty L t d | www .i rtcommunication s. c o m
Page of 11 Revision 04
ANALOGUE STEREO TO AES AUDIO CONVERTER
Revision His ory:
Revision Da e By Change Descrip ion Applicable o:
01 01/0 / 001 AL IRT border page added for PDF format. S/N ≥ 9911001
0 01/0 /001 AL 00COMMON.doc file contents added. S/N ≥ 9911001
03 5/07/ 00 SAH Links updated. S/N ≥ 9911001
04 30/03/ 016 AL Circuit description removed.
Upgraded to I.R.T. Communications company name.
S/N ≥ 9911001

AAC-3390
I.R. T. Communications Pty L t d | www .i rtcommunication s. c o m
Page 3 of 11 Revision 04
USER MANUAL
Table of Con en s:
Sec ion Page
Revision History
Operational Safety 4
General Description 5
Technical Specifications 6
Configuration 7
Link settings 7
Potentiometer settings 7
Installation 8
Signal Connections 8
Selection of Internal or External Clock Reference 9
Front and rear layouts 10
Maintenance & Storage 11
Warranty & Service 11
This instruction book applies to units with serial number ≥ 9911001.

AAC-3390
I.R. T. Communications Pty L t d | www .i rtcommunication s. c o m
Page 4 of 11 Revision 04
OPERATIONAL SAFETY
WARNING
Operation of electronic equipment involves the use of voltages and currents that
may be dangerous to human life. Note that under certain conditions dangerous
potentials may exist in some circuits when power controls are in the OFF position.
Maintenance personnel should observe all safety regulations.
Do not make any adjustments inside equipment with power ON unless proper
precautions are observed. All internal adjustments should only be made by suitably
qualified personnel. All operational adjustments are available externally without
the need for removing covers or use of extender cards.

AAC-3390
I.R. T. Communications Pty L t d | www .i rtcommunication s. c o m
Page 5 of 11 Revision 04
GENERAL DESCRIPTION
The IRT AAC-3390 is an analogue audio to AES/EBU digital audio signal converter, and converts standard stereo
analogue audio signals to the AES3-199 and SMPTE- 76 AES digital audio standard.
The input signals are a stereo pair of balanced audio at the standard +4 dBu line up level.
The outputs are three serial digital audio signals; one unbalanced BNC connection on the front panel for
monitoring and two from the rear panel assembly. The latter can be 110 Ohms balanced using the ZAC-3391 rear
panel assembly or 75 Ohms unbalanced BNC connections using the ZAC-3390 rear panel assembly.
A further input is provided for a reference AES input signal to lock the signal from the AAC-3390 to a station
reference.
The reference input can be either 110 Ohms terminating balanced line or 75 Ohms terminating unbalanced line.
Both connections are provided on the rear panel assembly. Selection of the input type is by links on the AAC-3390
main circuit board.
Front panel LED indicators are provided for DC voltage, presence of input audio levels above -30 dBu, lock to
external AES reference and overflow at 0 dBFS corresponding to the + 4 dBu full scale input audio level.
The AAC-3390 is designed to fit the IRT range of Eurocard mounting frames, including the 1 or 10 slot 3 RU and
slot 1 RU rack mounting frames.
S andard fea ures:
• Balanced s ereo inpu s.
• High impedance or 600 Ohm inpu ermina ion .
• AES ex ernal reference inpu .
• Balanced 110 Ω or unbalanced 75 Ω AES ou pu rear assembly op ions.
• Fron panel AES moni oring poin .
BLOCK DIAGRAM AAC-3390 SIGNAL PATH
A to D
converter Gen-lock
AES reference
input
L input
R input AES outputs
Overflow Ext. ref.
In use
L
R
Mon. output
Int. / Ext.
Select