singmai SM13 HD-SDI Attenuator User Manual

June 8, 2024
singmai

singmai SM13 HD-SDI Attenuator

Revisions

Date Revisions Version
07-11-2022 First draft 0.1

 Introduction

SM13 is an HD-SDI / SDI attenuator designed for testing the robustness of serial digital interface (SDI) links. The SDI input can be attenuated by up to 32dB in 1dB steps, selected using binary weighted switches. SM13 may also be used for testing other RF links up to 2GHz in bandwidth (e.g. aCVi)
SM13 requires 5VDC which is provided via the supplied AC-DC converter.

Quick start guide

Connect the SM13 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 SM13. Connect an SDI video input to the ‘SDI In’ BNC – SM13 supports SMPTE 259M and SMPTE 292M. SDI Out is an attenuated copy of the input. With all the switches off, the output is attenuated by 1.0dB the insertion loss). The switches introduce the stated attenuation in the output signal. For example,
turning ‘16dB’ switch on introduces 17dB of attenuation (16dB + 1dB insertion loss). Switching on ‘16dB’ and ‘2dB’ attenuation will add 19dB of attenuation (16dB + 2dB + 1dB insertion loss). The switches act immediately on the signal. SM13 Connections.

 SM13 Technical Details

A simplified block diagram of the SM13 is shown in Figure 2. SM13 Block diagram.
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 SM13 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/output signal path is 75Ω impedance. An RF attenuator can attenuate the input signal by up to 32dB in 1dB steps. Any RF signal may be applied to the SM13 providing it is within the bandwidth and input levels shown in the specification.

Specification

  • **** Power:         +5VDC ± 5% @ ~100mA (all outputs driven).
  • Dimensions:  80mm x 54mm x 25mm.
  • Video input:  Supports SMPTE 259M and standards.
  • Bandwidth:  2MHz – 2GHz ±0.5dB.
  • Input/output return loss: Better than -15dB.
  • Input level:   TBA.
  • Operating temperature:    -10 – 40 degC.

Appendix A: AC-DC adaptor

The specification for the supplied AC-DC adaptor is shown in Figures 3-5.
Power supply specification – Page 1. Power supply specification – Page 2. Power supply specification – Page 3.

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