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DISTRIBUTION AMPLIFIER
with ANALOG MONITORING
DMD-2105
DIGITAL VIDEO
INSTRUCTION MANUAL
SIGMA ELECTRONICS, INC.
P.O. Box 448
1027 COMMERCIAL AVE.
EAST PETERSBURG, PA 17520-0448
(717) 569-2681
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DMD-2105 SERIAL DIGITAL VIDEO DISTRIBUTION AMPLIFIER
GENERAL:
The DMD-2105 is a 1 input x 4 output Serial Digital Video distribution amplifier with an NTSC/PAL monitoring
output. The distribution amplifier provides four outputs from a SMPTE 259M-C input. This module is equipped with
equalization and reclocking circuitry, therefore cable runs up to 1000 feet on the input are possible.
The module als o provides a composite video monitor ing output. This enables the viewing of the 270 Mb/s input
signal on a composite video monitoring device such as a waveform monitor, oscilloscope or standard video monitor.
POWER:
The DMD-2105 operates from bus voltages of unr egulated +20 VDC and -20 VDC. Thes e voltages are supplied by
the Sigma fram e/power supply. The module regulates the bus voltage to +5 VDC via the regulator U3 and -5 VDC via
the regulator U2. Circuit protection is provided by RT3 and RT4. These PTC Thermistors (Positive Temperature
Coefficient Therm al Res ist ors ) s er ve as per manent, self resetting, fus e devices . In the event of excessive current draw,
on either of the bus lines, the PTC on the line will open. Upon corr ection of the fault, the PT C T herm istor will cool to an
operational temperature and reset.
FRAMES:
The DMD-2105 module can reside in any of four ( 4) different frames provided by Sigma Electronics, Inc. If this
module is purchased as a component of a system, please refer to the SERIES 2100 FRAMES Instruction Manual. If the
module was purchased separately, a preexisting frame must be present for proper operation. Sigma would like to
emphasize the fact that any of the Series 2100 modules can be installed with any other Series 2100 module within the
Series 2100 frames.
♦ In addition to the frames listed below, the module can be inserted into the SSB-21 Stand-Alone box. When
purchased in this configuration it is designated as DMD-2605
♦ The SS-2100-2 f rame is designed for desk -top applications. This fram e provides two (2) positions for two single
slot modules or a single two slot module. An optional tray (RMT-2100-2A) is available for rack installations.
♦ The SS-2100-6 frame is designed for 19 inch EIA rack installations. It provides six (6) slots for modules in 1 RU.
♦ The SS-2100-12+ fram e pr ovides a redundant power s upply in a 3 RU fram e f or 19 inch EIA rack installations. T his
frame has thirteen (13) slot positions for modules.
♦ The SS-2100-16+ frame is also available for installations in a 19 inc h EIA rac k. This frame provides seventeen (17)
slots for module within 3 RU.
Additional information on the various f ram es are available. Please ref er to the special section on fram es if this was
purchased as a complete s ystem. If this information is not provided with this shipment, contact Sigma Elec tronics for
assistance.
CONNECTIONS:
W iring to the m odule is perform ed via the connectors located on the rear panel. BNC connectors are used for the
Input, four (4) distribution am plifier outputs and com posite video monitoring output. Each output is designed to drive a
75Ω load. The utilized outputs must be term inated by a single end of line 75Ω termination to ensure proper signal level.
Unused outputs do not require a 75Ω load.
D
M
D
2
1
0
INPUT
5
1
REAR PANEL CONNECTIONS
2
OUTPUTS
Figure 1
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3
4
C
O
M
P
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DMD-2105 SERIAL DIGITAL VIDEO DISTRIBUTION AMPLIFIER
CONFIGURATION:
Set switch S1 to select the desired composite output format.
Composite Video Selection S1-1 S1-2
NTSC OFF OFF
PAL-M ON OFF
PAL-B,G,H,I OFF ON
PAL-N ON ON
Set switch S1 to select setup on the composite output.
Composite Video Selection S1-3
Setup Off OFF
Setup On ON
SPECIFICATIONS:
DIGITAL VIDEO INPUT:
VIDEO INPUT: ..................................... 1, Single-ended, terminated 75Ω, SMPTE 259M-C, 800 mVp-p
INPUT RETURN LOSS: ....................... 15dB minimum, 5 MHz to 270 MHz
DATA RATE: ........................................ 270 Mb/s
INPUT CABLE LENGTH: ..................... 1000 feet maximum of BELDEN 1694A (or equivalent)
CONNECTOR: .................................. 75Ω BNC
DIGITAL VIDEO OUTPUT:
DISTRIBUTION OUTPUT SIGNAL: ..... 4 Outputs, 800 mVp-p typical, ±10%
OUTPUT RETURN LOSS: ................... 15 dB minimum, 5 MHz to 270 MHz
OVERSHOOT: ..................................... Maximum10% of total amplitude
CONNECTORS: ................................... 75Ω BNC
ANALOG VIDEO OUTPUT:
MONITORING OUTPUT: ..................... 1, 1.4 Vp-p max. NTSC/PAL composite video
DIFFERENTIAL GAIN: ......................... 1% maximum
DIFFERENTIAL PHASE: ...................... 1° maximum
TILT FIELD AND LINE: ....................... 1% maximum
CONNECTOR: ................................... 75Ω BNC
ENVIRONMENTAL:
OPERATIONAL TEMPERATURE: ...... 0° to 50° C (+32° to +122° F)
MECHANICAL:
SIZE: ................................................... 1 card slot, consumes one position within a Sigma frame.
All specifications, drawings, dimensions, weights and other details are subject to change without notification.
Information is intended to give a general performance and operation guideline of the product.
Sigma Electronics, Inc.; P.O.Box 448; 1027 Commercial Ave.; East Petersburg, PA 17520-0448
Main Office: Tel: (717) 569-2681 Fax: (717) 569-4056
REV0 MAY03 DMD-2105
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