Singmai Electronics DB02 User manual

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DB02
NTSC/PAL Video Encoder
and
Black-Burst Generator
User Manual
Revision 0.1
6th October 2023

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Revisions
Date
Revisions
Version
06-10-2023
First draft
0.1

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Contents
Revisions...................................................................................................................................................2
Contents ...................................................................................................................................................3
Figures ......................................................................................................................................................3
1. Introduction ....................................................................................................................................4
2. Quick start guide.............................................................................................................................5
3. DB02 Technical Details....................................................................................................................6
4. Specification....................................................................................................................................7
Appendix A: AC-DC adaptor......................................................................................................................8
Figures
Figure 1 DB02 Connections. .....................................................................................................................5
Figure 2 DB02 Block diagram....................................................................................................................6
Figure 3 Power supply specification: electrical. .......................................................................................8
Figure 4 Power supply specification: mechanical.....................................................................................9

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1. Introduction
DB02 is a broadcast quality video encoder for NTSC-M and PAL standards.
DB02 accepts serial digital interface (SDI) video at either 525i or 625i standards and converts this to a
broadcast quality NTSC or PAL output (respectively). In the absence of any SDI input the DB02 outputs
a black and burst signal. NTSC or PAL output can be selected by a switch allowing the DB02 to be used
as a black-burst generator.
The analogue video output is available as single-ended (coaxial) or differential (UTP).
DB02 requires 12VDC which is provided via the supplied AC-DC converter.

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2. Quick start guide
Connect the DB02 to the supplied AC/DC adaptor. Fit the appropriate blades to the adaptor for your
country. Blades are supplied for North America, Europe, UK, China and Australia. The adaptor accepts
AC between 90 and 264VAC –the full specification is provided in Appendix A.
The connections to the DB02 are shown in Figure 1.
Connect the 12VDC jack from the adaptor to the +12VDC ‘Power in’ socket on the DB02. The ‘Power
On’LED should light up blue.
Figure 1 DB02 Connections.
Connect your SDI video input to the SDI In input (BNC). The DB02 accepts either 525i or 625i video.
The SDI Lock LED will light if the SDI input is valid.
The encoded video is available as either differential (UTP) or single-ended (coaxial). Both outputs may
be used at the same time if required. The output standard follows the SDI input –NTSC if 525i and
PAL if 625i. The NTSC/PAL select switch has no effect when the SDI input is connected.
The positive video output is on pin 1 of the RJ-45 connector and the inverted video is on pin 2.
In the absence of an SDI input the DB02 can act as a black-burst generator. A stable clock is used to
drive the encoder and the output standard is selected by the NTSC/PAL switch (down for NTSC, up for
PAL).

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3. DB02 Technical Details
A simplified block diagram of the DB02 is shown in Figure 2.
Figure 2 DB02 Block diagram.
The +12VDC from the AC/DC power adaptor is filtered and protected from over-range or reverse
polarity inputs. The 12VDC input is then regulated to provide clean power supplies for the module.
The SDI input is equalized and de-serialised. The video encoder uses a variant of the SingMai PT8 IP
core. The output from the IP core is 10-bit digital composite video. This is converted to analogue in a
digital to analogue converter (DAC). The analogue video is then filtered to remove clock noise and
reconstitute the video before being output as both differential and single-ended outputs. The single-
ended output should be terminated in 75Ωand the differential output in 100Ω. The positive
differential signal is on pin 1 of the RJ-45 connector and the negative signal on pin 2.
If there is no SDI input the encoder uses a crystal oscillator (XTAL) to generate a black and burst
output.

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4. Specification
Power: +9-14V (+12VDC nominal) @ ~240mA (all outputs driven).
Dimensions: 120mm x 78mm x 27mm.
Video input: SDI (SMPTE-259M). >15dB return loss.
Video output: NTSC-M or PAL. 75Ω output impedance (coaxial),
100Ωoutput impedance (UTP).
Luma bandwidth: 5.75MHz ± 0.2dB.
Chroma bandwidth: 1.3MHz –3.0dB.
Differential gain/phase: <1%, <1°.
K-factor: <1%.
Luma/chroma delay: <10ns.
Operating temperature: -10 –+40 degC.

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Appendix A: AC-DC adaptor
The specification for the supplied AC-DC adaptor is shown in Figures 3 and 4.
Figure 3 Power supply specification: electrical.

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Figure 4 Power supply specification: mechanical.