IRT DAA-3400 User manual

3400-daa.ib.doc Page 1 of 8 25-07-2002
EUROCARD
AES/EBU Distribution Amplifier
Type DAA-3400
Designed and manufactured in Australia
IRT can be found on the Internet at:
http://www.irtelectronics.com
I R T Electronics Pty Ltd A.B.N. 35 000 832 575
26 Hotham Parade, ARTARMON N.S.W. 2064 AUSTRALIA
National: Phone: [phone] Fax: [phone]
International: [phone] [phone]
Email: [e-mail]
Web: www.irtelectronics.com
IRT Communications
www.irtcommunications.com

3400-daa.ib.doc Page 2 of 8 25-07-2002
DAA-3400
AES/EBU
Distribution Amplifier
Instruction Manual
Table of Contents
Item Page
Operational Safety 2
Description 3
Circuit description 3
Specifications 4
Installation 5
Front and rear layouts 6
Warranty & Service 7
Equipment return 7
Drawing list index 8
This instruction book applies to units SN:9907001 and above
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.
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3400-daa.ib.doc Page 3 of 8 25-07-2002
Description.
The IRT DAA-3400 is an eight output non-reclocking distribution amplifier for AES/EBU digital audio signals. The
DAA-3400 will operate at any frequency from 34 to 54 KHz and may be used with non-EAS digital signals that have
net zero DC content. Provision is made for 75 ohm coax and 110 ohm balanced line in the input and output
distribution circuits. The DAA-3400 is designed to fit the IRT range of eurocard mounting frames, including the 12
slot FR-700 and 2 slot FRU-1030 rack mounting frames.
Circuit Description.
The DAA-3400 input circuit is a linking arrangement (SW1,SW2) to select either the balanced or unbalanced input
from the rear panel input connector. The signal is then coupled to a high speed differential line receiver using
transformer T1. The line receiver is buffered by its internal line driver circuit and this signal drives output line driver
circuits for the nine outputs from the DAA-3400, eight to the rear panel assembly via transformers T2-T9 and one
via T10 to the front panel monitor connector. The eight outputs to the rear panel are sourced through 51 ohms
resistors to set the output impedance for the balanced out put circuits when using the ZAA-3401 rear panel assembly.
For 75 ohms output circuits the ZAA-3400 rear panel assembly uses a resistive voltage divider to set the output
impedance back to 75 ohms at a nominal level of 1 Vp-p.
The power supply comprises two bridge rectifiers whose rectified outputs are paralleled (positive and negative
respectively) to provide redundancy. The inputs to these rectifiers are two independent feeds of 28 Vac (centre tap
grounded). A DC-DC converter module is used to provide the required 5 volts supply for the line receiver and
transmitter circuits. The DC indicator LED on the front panel is used to indicate presence of the 5 volts supply.
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3400-daa.ib.doc Page 4 of 8 25-07-2002
DAA-3400 Specifications
Inputs 2
Type 1 x 110 Ω balanced.
or
1 x 75 Ω unbalanced.
selected by link on PCB.
Format AES3-1992 standard.
Input level 200 mVp-p minimum.
Input cable length >500m Belden (8281)
>200m 110 Ω(AES digital high quality
shielded pair).
Outputs 8
Rear panel type ZAA-3400 75 Ωunbalanced >1Vp-p.
or
Rear panel type ZAA-3401 110 Ωbalanced >3Vp-p.
Front panel monitoring 1 x 75 Ωunbalanced.
Format AES3-1992 standard.
Performance
Frequency range 32 – 54 KHz continuous.
Output signal rise and fall times <20 ns.
Power requirement per unit 14V-0-14Vac <2 VA
Connectors
Unbalanced BNC.
Balanced Phoenix 3 terminal plug-in
screw terminal blocks.
Operating temperature range 0 - 50° C ambient
Mechanical 6 HP x 3 U x 220mm IRT Eurocard
Suitable for mounting in IRT 19" rack chassis types
FR-700 & FRU-1030.
Finish: Front panel Grey powder coat, silk-screened black lettering &
red IRT logo
Rear assembly Detachable silk-screened PCB with direct mount
connectors to Eurocard and external signals
Standard accessories Operation manual
Optional accessories TME-6 module extender card
Due to our policy of continuing development these specifications are subject to change without notice.
IRT Communications
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3400-daa.ib.doc Page 5 of 8 25-07-2002
Installation
Pre-installation:
Handling:
This equipment may contain or be connected to static sensitive devices and proper static free handling precautions
should be observed.
Where individual circuit cards are stored, they should be placed in antistatic bags. Proper antistatic procedures
should be followed when inserting or removing cards from these bags.
Power:
AC mains supply: Ensure that operating voltage of unit and local supply voltage match and that correct rating fuse
is installed for local supply.
DC supply: Ensure that the correct polarity is observed and that DC supply voltage is maintained within the
operating range specified.
Earthing:
The earth path is dependent on the type of frame selected. In every case particular care should be taken to ensure that
the frame is connected to earth for safety reasons. See frame manual for details.
Signal earth: For safety reasons a connection is made between signal earth and 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.
Installation
Installation requires the unit to be plugged into the front of the mounting frame and the rear assembly to be secured
to the rear panel of the mounting frame, to install a module in the frame please see instructions under selected frame
type in the relevant manual describing the frames.
Signal connections are made to the connectors on the selected rear panel of the DAA-3400.
The input signal can be either 75 ohms unbalanced terminating or 110 ohms balanced terminating, the input
selection is done be links SW1, SW2 on the module pcb near pin 32 of the input connector. Move the links
provided to the 75 or 110 positions marked on the board as required. The input signal is then connected to the
appropriate input connector on the rear panel.
For unbalanced 75 ohms output circuits use the ZAA-3400 rear panel and for balanced 110 ohms output circuits use
the ZAA-3401 rear panel assembly.
The presence of signal at the output of the ZAA-3400 can be monitored using the front panel monitoring BNC socket
provided.
Diagrams are provided giving details of the circuits of the DAA-3400.
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3400-daa.ib.doc Page 6 of 8 25-07-2002
Front & rear panel connector diagrams
The following front panel and rear assembly drawings are not to scale and are intended to show connection order and
approximate layout only.
OUTPUT MON
DC
DAA-3400
N140
ZAA-3401
3
2
Gnd
AES O/P's
75 Ohm
INPUT
110 Ohm
3
2
Gnd
3
2
Gnd
3
2
Gnd
3
2
Gnd
3
2
Gnd
3
2
Gnd
3
2
Gnd
3
2
Gnd
ZAA-3400
3
2
Gnd
AES O/P's
75 Ohm
INPUT
110 Ohm
IRT Communications
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3400-daa.ib.doc Page 7 of 8 25-07-2002
Maintenance & storage
Maintenance:
No regular maintenance is required.
Care however should be taken to ensure that all connectors are kept clean and free from contamination of any kind.
This is especially important in fibre optic equipment where cleanliness of optical connections is critical to
performance.
Storage:
If the equipment is not to be used for an extended period, it is recommended the whole unit be placed in a sealed
plastic bag to prevent dust contamination. In areas of high humidity a suitably sized bag of silica gel should be
included to deter corrosion.
Where individual circuit cards are stored, they should be placed in antistatic bags. Proper antistatic procedures
should be followed when inserting or removing cards from these bags.
Warranty & service
Equipment is covered by a limited warranty period of three years from date of first delivery unless contrary
conditions apply under a particular contract of supply. For situations when “No Fault Found” for repairs, a
minimum charge of $A100.00 will apply, whether the equipment is within the warranty period or not.
Equipment warranty is limited to faults attributable to defects in original design or manufacture. 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 serviced and not in associated equipment. If
possible, confirm this by substitution.
Before returning equipment contact should be made with IRT or your local agent to determine whether the
equipment can be serviced in the field or should be returned for repair.
The equipment should be properly packed for return observing antistatic procedures.
The following information should accompany the unit to be returned:
1. A fault report should be included indicating the nature of the fault
2. The operating conditions under which the fault initially occurred.
3. Any additional information which may be of assistance in fault location and remedy.
4. A contact name and telephone and fax numbers.
5. Details of payment method for items not covered by warranty.
6. Full return address.
7. For situations when “No Fault Found” for repairs, a minimum charge of $A100.00 will apply, whether
the equipment is within the warranty period or not.
Please note that all freight charges are the responsibility of the customer.
The equipment should be returned to the agent who originally supplied the equipment or, where this is not
possible, to IRT direct as follows.
Equipment Service
IRT Electronics Pty Ltd
26 Hotham Parade
ARTARMON
N.S.W. 2064
AUSTRALIA
Phone: [phone] Fax: [phone]
Email: [email protected]
IRT Communications
www.irtcommunications.com

3400-daa.ib.doc Page 8 of 8 25-07-2002
Drawing List Index
Drawing # Sheet# Description
804169 1 DAA-3400 AES/EBU distribution amplifier
804174 1 ZAA-3400 75 ohms unbalanced rear assembly
804175 2 ZAA-3401 110 ohms balanced rear assembly
IRT Communications
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Title
SCALE
SIZE
Sheet
DRAWN CHECKED ENG. APP. Revision:
DO NOT COPY NOR
DISCLOSE TO ANY
THIRD PARTY
WITHOUT WRITTEN
CONSENT
of1
IRT Electronics Pty. Ltd.
Drawing No.
COPYRIGHT
ARTARMON NSW AUSTRALIA 2064
A3
N.T.S. 1
DAA-3400
804169
Date:
4
3-Oct-2001
1 28-01-98
AES/EBU AMPLIFIER
PL2/1
BAL I/P
UNBAL I/P
PL1/20a,b PL1/18a,b PL1/19a PL1/19b PL1/17a PL1/17b PL1/16a,b PL1/14a,b PL1/15a PL1/15b PL1/13a PL1/13b PL1/12a,b PL1/10a,b PL1/11a PL1/11b PL1/ 9a PL1/ 9b PL1/ 8a,b PL1/ 6a,b PL1/ 7a PL1/ 7b PL1/ 5a PL1/ 5b
PL1/21a,b PL1/22a,b PL1/23a,b PL1/24a,b PL1/25a,b PL1/26a,b
AES MON.
2 16-04-98
+5
+5
+5
+5
PL1/29a,b PL1/30a PL1/30b PL1/31a PL1/32a PL1/31b PL1/32b
'AES MON.'
75
110
110
75
3 29-07-99
R9
PCB 804170P ISS.6
T1
R1
120
8 7 6 54
3 2 1
U2 DS9638
8 7 6 54
3 2 1
U3 DS9638
8 7 6 54
3 2 1
U4 DS9638
8 7 6 54
3 2 1
U5 DS9638
8 7 6 54
3 2 1
U6 DS9638
R2
75
1 3
2
FL1
1 3
2
FL2
1 3
2
FL3
1 3
2
FL4
2 1
ZD1
1N5364
VIN-
2
VIN+
1+V 4
-V 3
5
CONV1 ZS32405
C1
100nF
1 2
3
D1
BAV99
1 2
3
D2
BAV99
C21
100nF
C20
100nF
C19
100nF
C18
100nF
C17
100nF
C16
1uF
C15 1uF
C14
1uF
C13
1uF
C12
1uF
C11
1uF
C10
1uF
C9
1uF
C8
1uF
DB1
DB2
R16 51 R15 51
R14
51
R17
51
R18
51
R19 51 R20 51
R21
51
C24
1500uF
C23
1500uF
R22
51
R23 51 R24 51
R25
51
R26
51
R27 51 R28 51
R29
51
T2
T3
T4 T5 T6 T7
T8
T9
C5
1uF
1 2 3 45
6 7 8
R
D
U1
DS8921A
R101
820
21
LD1
GRN
'DC'
SK101
8 7 5 6 3 4 2 1
SK102/PL2
3 1
2
SW1
3 1
2
SW2
C33
100nF
C32
100nF
R4
100
R3
100
C4
100nF
C3
100nF
C6
100nF
C7
100nF
R9
120
R10
180
C31
100nF
C22
1uF
R6
0R0
3 1
2
LK9
R5
0R0
C25
100nF
F1
2R2
F2
2R2
F3
2R2
F4
2R2
R35 47R R34 47R
L3
L1
L2
K.N.
4 28-02-01 ECR1181
+5
IRT Communications
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