singmai SM20 Distribution Amplifier User Manual
- June 9, 2024
- singmai
Table of Contents
singmai SM20 Distribution Amplifier
Revisions
Introduction
SM20 is a serial digital interface (SDI) distribution amplifier module
supporting 3G-SDI, HD-SDI and SDI standards. The SDI input is equalized and
re-clocked to provide four buffered outputs.
SM20 requires 5VDC which is provided via the supplied AC-DC converter
Quick start guide
- Connect the SM20 to the supplied AC/DC adaptor. The adaptor should be supplied with a power lead appropriate to your country. The adaptor accepts AC between 100 and 240VAC – the full specification is provided in Appendix A.
- Connect the 5VDC jack from the adaptor to the +5VDC ‘Power in’ socket on the SM20.
- Connect an SDI video input to the ‘SDI In’ BNC – SM20 supports SMPTE 259M, SMPTE 292M, SMPTE 296M, SMPTE 372M and SMPTE 425M standards. Any or all of the four ‘SDI Out’ BNCs may be connected. Each ‘SDI out’ is an equalized and re-clocked copy of the video input.
SM20 Technical Details
A simplified block diagram of the SM20 is shown in Figure 2.
- The +5VDC from the AC/DC power adaptor is filtered and protected from over-range or reverse polarity inputs by a resettable fuse. This fuse will protect the SM20 until the out-of-range condition is removed when it automatically reset itself. The 5VDC input is then regulated to provide a ‘clean’ 3.3VDC supply for the module.
- The SDI input is terminated in 75Ω. It is then equalized and re-clocked to compensate for cable loss and reduce jitter. Each SDI output is individually buffered.
Specification
- Power : +5VDC ± 5% @ ~250mA (all outputs driven).
- Dimensions : 160mm x 78mm x 27mm.
- Video input : Supports SMPTE 259M, SMPTE 292M, SMPTE 296M, SMPTE 372M and SMPTE 425M standards.
- Input return loss : TBA.
- Output level : 800mV pk-pk.
- Operating temperature: -10 – 40 deg C
Power supply specification
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