3002 DVA_ib DVA Ib

User Manual: 3002-DVA_ib

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I R T Electronics Pty Ltd A.B.N. 35 000 832 575
26 Hotham Parade, ARTARMON N.S.W. 2064 AUSTRALIA
National: Phone: (02) 9439 3744
Fax: (02) 9439 7439
International:
+61 2 9439 3744
+61 2 9439 7439
Email: sales@irtelectronics.com
Web: www.irtelectronics.com

IRT Eurocard Types
DVA-3002
Serial Digital VDA

Designed and manufactured in Australia
IRT can be found on the Internet at:

http://www.irtelectronics.com

3002-dva.ib.doc

Page 1 of 8

16/07/2002

DVA-3002
Serial Digital VDA

Instruction Manual

Table of Contents
Section

Page

Operational Safety
General Description
Applications
Specifications
Circuit description
Installation
Front and rear layouts
Maintenance & Storage
Warranty and service
Equipment return
Drawing list index

2
3
3
4
5
5
6
7
7
7
8

This instruction manual applies to DVA-3002 assembly 804048 units later than S/N 9710001

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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General Description
The IRT DVA-3002 is a one in eight out distribution amplifier for SMPTE/EBU serial digital video signals.
The DVA-3002 features an input circuit with automatic cable equalisation for Belden 8281 or PFS1/2 coaxial cable
and cable driver circuits for nine individually sourced outputs, eight outputs are provided on the rear connector panel
and the ninth output is a monitoring output on the front panel of the unit.
The input cable equaliser circuit incorporates a carrier detection circuit to mute the output when no signal is applied
to the unit. The DVA-3002 uses the carrier detect signal to energise a relay when carrier is present, the relay contacts
are connected to SK10 on the rear panel to give a failure alarm in the form of a make (or break) to ground on failure
as set by LK1 on the circuit board.
The DVA-3002 is built in a 3U extended Eurocard 220 mm x 100 mm modules designed to mount in the IRT FR700, FR-722A, FR-748 and FRU-1030 family of Eurocard frames.

Applications
The DVA-3002 is intended to be used where multiple signal outputs are required from equipment with only one
output and to provide input cable equalisation for devices not having this feature as most unequalised inputs will
only support input signal cable lengths of less than 20 metres.
Frequent reclocking of a serial digital signal can lead to increased jitter and unnecessary increased cost, complexity
and transit time in circuits. The DVA-3002 is therefore the unit of choice where reclocking of the signal is provided
by the destination equipment or otherwise where reclocking is not deemed necessary.

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16/07/2002

Technical specifications
DVA-3002
Input:
Number
Impedance
Return loss

1.
75 Ohm.
>15 dB 5 MHz to 360 MHz.

Outputs:
Number
Signal level
Impedance
Return loss
DC offset

9.
800 mV ± 10%
75 Ohm.
>15 dB 5 MHz to 360 MHz.
Nil.

Performance:
Cable compensation
Output rise time

Automatic, better than 300 metres at 270 Mb/s
for Belden 8281 or PSF1/2 cable.
<1 ns, (700 ps typically).

Connectors:

BNC.

Indicators:
Power
Signal present
Signal fail (relay contacts)

LED (green) for +5v.
LED (green) for signal present.
Rear panel SK10 (pins 1 and 2)

Power requirement:
Voltage
Consumption

28 Vac CT (14-0-14 Vac) or ±16 Vdc.
2.5 VA (<90 mA).

General:
Temperature range

0 - 50° C ambient

Mechanical

Suitable for mounting in IRT 19" rack chassis
types FR-700 & FR-722 with input, output and
power connections to the rear.
6 HP x 3U Extended Eurocard (220 mm x 100 mm).
With rear assembly 330g.

Size
Weight
Finish:
Front panel
Rear assembly

Standard accessories:

3002-dva.ib.doc

Grey enamel, silk screened black lettering
& red IRT logo.
Detachable silk screened PCB with direct mount
connectors to Eurocard and external signals.
Rear connector assembly (supplied with module).

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16/07/2002

Circuit Description
The input circuit of the DVA-3002 consists of U1 a CLC014 adaptive cable equaliser IC, which automatically adapts
to equalise any cable length from zero metres to lengths that attenuate the signal by 40 dB at 200 MHz. This
corresponds to 300 metres of Belden 8281 cable. A carrier detect and output mute circuit in the CLC014 is used to
mute the output when no signal is present. The CLC014 is insensitive to the pathological patterns that can be present
in the serial digital video signal.
The DVA-3002 also features an OUTPUT MONITOR point on the front panel. The output monitor is a isolated
copy of the signal present at the rear panel outputs.
The output of the CLC014 input stage is coupled to U2, U3 and U5 CLC007 cable driver circuits to provide the nine
isolated outputs from the DVA-3002.
Note the cable driver outputs are complementary signals thus signal inversion can occur between the input and three
of the outputs of the DVA-3002.
The input cable equaliser circuit U1 incorporates a carrier detection circuit to mute the output when no signal is
applied to the unit. The carrier detect signal energises relay RL1 via inverter Q1 when carrier is present, the relay
contacts are connected to SK10 on the rear panel to give a failure alarm in the form of a make (or break) to ground
on failure as set by LK1 on the circuit board.
The dual AC inputs are rectified by D1 to D4, and then regulated in a LM2575-5 switch mode regulator circuit U4 to
provide the +5V operating voltage for the unit.

Installation
Handling:
The DVA-3002 contains static sensitive devices and proper static free handling precautions should be observed.
When individual modules are stored, they should be placed in antistatic bags and proper antistatic procedures should
be followed when inserting and removing cards from these bags.

Power:
Ensure that the voltage selection of the IRT mounting frame used to house the DVA-3002 and the local AC mains
supply voltage match and that the correct rating fuse is installed in the mounting frame power supply.

Earthing:
Chassis earth connection of the equipment mounting frame is via the earth connection on the three pin (IEC) AC
mains supply inlet. This is a safety earth and must be connected.

Installation in frame or chassis:
See details in separate manual for selected frame type.
LK1 is factory set for a contact make to ground on signal failure at SK10 pin 2 on the rear panel, move LK1 from
the normally closed (N/C) to the normally open (N/O) position for a break to ground on signal or power loss.
The presence of signal is indicated by the ‘SIGNAL PRESENT’ front panel LED (green).
The presence of the internal +5 Vdc supply is indicated by the front panel LED (green).
It is recommended that unused outputs on the rear panel be terminated with 75 ohm termination plugs.

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16/07/2002

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.

3002

DV A-3 0 0 2

1
OUTPUTS
2
3
4
SIGNAL
PRESENT

5
6
7
8

OUTPUT MON

DC
2
1

INPUT

1 = GND
2 = ALARM

N140

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16/07/2002

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.
2.
3.
4.
5.
6.
7.

A fault report should be included indicating the nature of the fault
The operating conditions under which the fault initially occurred.
Any additional information which may be of assistance in fault location and remedy.
A contact name and telephone and fax numbers.
Details of payment method for items not covered by warranty.
Full return address.
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:
Email:

3002-dva.ib.doc

61 2 9439 3744
service@irtelectronics.com

Page 7 of 8

Fax:

61 2 9439 7439

16/07/2002

Drawing List Index
Drawing #

Sheet #

Description

804048

DVA-3002 serial digital VDA schematic diagram.

3002-dva.ib.doc

Page 8 of 8

16/07/2002

SK1

1
2
3

L1/RA

EYE
MON

TP1

26a,b

25a,b

24a,b

23a,b

22a,b

21a,b

31a,b

30a,b

29a,b

28a,b

(J1/P1)

100n

10uF
C5
10nF

4u7

100n
C32

FL4
DSS306

PCB 804049R

DSS306
FL2

C9
100pF

100n

DSS306
FL1

C6 100pF

68R

R27

FL3
DSS306

J2/RA optional power in
[used when fitted to FR-722A or FRU-1030 frame]

INPUT

MON. O/P

SK11

150

R28

4R7

10nF

VEE

IN-

IN+

VCC

1N4004

0R0

JP2

R3
120

C3
100n

100

R25

C2
100n

0R0

R1
75

C1
100n

R2
100

C24
10nF

C33 4u7

JP1

JP3

1N4004

Vee

MUTE

CLC014AJE

AEC-

AEC+

Vcc

OEM

Vcc

CLC007AJE

L5
470nH

100

C26
1000uF

BAS32
C25
10nF

R26

R8
75

C27
100uF

1
I
O

R14
100

R11
100

U4
LM2575-5.0

R10
75

G
3

C30

EN
5

10nF

1
2

C28
220uF

22uH

330uH
D5
1N5822

C14
10nF

C12
10nF
C11
10uF

+5V

TP2

R13
100

R12
100

L4
470nH

+5V

C15
100pF

C29
220uF

R23
820

(DC IND.)

LD1
LDGRN

VCC

IN+

IN-

VEE

U3
CLC007AJE

VCC

IN+

IN-

VEE

U2
CLC007AJE

C13
100pF

R7
10K

22K

R24
820

LD2
LDGRN
(SIGNAL
PRESENT)

2
1

4u7

C23

4u7

C22

4u7

C21

4u7

C20

4u7

C19

4u7

C18

4u7

C17

4u7

C16

BAS32

C34

R18

R19

R20

R21

R22

2 30-06-97

Date:

23-Mar-2001

Revision: 2

ENG. APP.

K.N.

32b

L2/RA

L3/RA

L4/RA

L6/RA

L5/RA

L7/RA

804048

Sheet
1 of 3

DVA-3002
SERIAL DIGITAL VIDEO
DISTRIBUTION AMPLIFIER
Drawing No.

Title

SK10

IRT Electronics Pty. Ltd.
ARTARMON NSW AUSTRALIA 2064

SCALE
N.T.S.

SIZE

3
2
1

SK2

SK3

SK4

SK6

SK5

SK7

SK8

SK9

OUTPUTS

L8/RA

L9/RA

TO GROUND ON ALARM, AS SET BY LK1

DO NOT COPY NOR
DISCLOSE TO ANY
THIRD PARTY
WITHOUT WRITTEN
CONSENT

CHECKED

27a,b

20a,b

19a,b

18a,b

17a,b

16a,b

15a,b

14a,b

13a,b

12a,b

11a,b

10a,b

9a,b

8a,b

7a,b

6a,b

5a,b

4a,b

3a,b

2a,b

ALARM CIRCUIT

n.o.

LK1
n.c.

(P1/J1)
1a,b

CONTACT CLOSURE (OR BREAK)

V23026

RL1

Q1
BC846

4u7
RL1

DRAWN

C10
10nF

R17

C35

R16

R15

1
3

C31

2
1

3
8
3
2

1
2

1 29-01-97

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Create Date                     : 2002:07:16 10:30:50
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Modify Date                     : 2002:07:16 10:35:54+11:00
Page Count                      : 9

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3002 DVA_ib DVA Ib

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