IRT AAC-3390 User Manual Download Page 5

 

AAC-3390 

I.R.T. Communications Pty Ltd | www.irtcommunications.com 

 

 

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 AES3-1992 and SMPTE-276 AES digital audio standard. 
 
The input signals are a stereo pair of balanced audio at the st4 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 +24 dBu full scale input audio level. 
 
The AAC-3390 is designed to fit the IRT range of Eurocard mounting frames, including the 12 or 10 slot 3 RU and 2 
slot 1 RU rack mounting frames. 
 

Standard features: 

 

Balanced stereo inputs. 

 

High impedance or 600 Ohm input termination. 

 

AES external reference input. 

 

Balanced 110 Ω or unbalanced 75 Ω AES output rear assembly options. 

 

Front panel AES monitoring point. 

 

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 

Mon. output 

Int. / Ext. 

Select 

Summary of Contents for AAC-3390

Page 1: ...AAC 3390 I R T Communications Pty Ltd www irtcommunications com Revision 04 Analogue Stereo to AES Audio Converter User Manual...

Page 2: ...n History Revision Date By Change Description Applicable to 01 01 02 2001 AL IRT border page added for PDF format S N 9911001 02 01 02 2001 AL 00COMMON doc file contents added S N 9911001 03 25 07 200...

Page 3: ...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 Cl...

Page 4: ...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 eq...

Page 5: ...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 o...

Page 6: ...monitoring 1 x 75 unbalanced 1 Vp p Format AES3 1992 standard Performance Sample rate 48 kHz internal rate or as set by external reference Output signal rise and fall times 20 ns Frequency response 0...

Page 7: ...SW2 75 AES reference input 75 Ohm unbalanced BNC 110 AES reference input 110 Ohm balanced 3 pin Phoenix plug type Rear Assembly Rear assembly links LK1 and LK2 open circuit default analogue input imp...

Page 8: ...chassis earth No attempt should be made to break this connection Installation in frame or chassis See details in separate manual for selected frame type Signal Connections Input signal connections ar...

Page 9: ...rnal clock and the external clock open links LK6 and LK15 on the module main circuit board In this mode of operation the AAC 3390 will lock to a external reference applied to the external reference in...

Page 10: ...panel connector diagrams ZAC 3390 Unbalanced AES O P s Rear Assembly Option Analogue Input Left Right Unbalanced AES O P s Reference AES I P Bal Unbal Link select ZAC 3391 Balanced AES O P s Rear Ass...

Page 11: ...e Warranty on components shall be extended by IRT only to the extent obtainable from the component supplier Equipment return Before arranging service ensure that the fault is in the unit to be service...

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