singmai SM09 Distribution Amplifier User Manual

singmai SM09 Distribution Amplifier

Introduction

• SM09 is a video distribution amplifier module. It accepts a PAL/NTSC/SECAM or PAL/NTSC 960H input and provides 6 simultaneous outputs. Each output is individually buffered and filtered.
• SM09 requires 5VDC which is provided via the supplied AC-DC converter.

Quick start guide

• Connect the SM09 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 SM09. The ‘Power On’ LED should light up yellow.
• Connect a composite video input to the ‘Video In’ BNC. Any or all of the six ‘Video Out’ BNCs may be connected. Each ‘Video out’ is a copy of the video input.

SM09 Technical Details

• A simplified block diagram of the SM09 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 SM09 until the out-of-range condition is removed when it automatically reset itself. The 5VDC input is then regulated to provide a ‘clean’ +4VDC for the video input buffer and DC restoration circuits and a 3.3VDC supply for the output filter and buffer. The video input is terminated in 75Ω. It is then buffered and protected against out-of-range inputs. The video input is then DC restored using an active clamp circuit before driving six identical output buffers. Each output is filtered to remove any out of band noise – the filter response is shown in Figure 3.
• The buffer amplifies the video by a gain x2 (6dB) so that it can drive a series 75Ω resistor. Each output must be terminated in 75Ω for the SM09 to have the correct gain. Because each output is individually buffered any or all of the outputs maybe be connected – unused outputs may be left unconnected.
• The SM09 has a nominal gain of x1 (0dB) when the output is terminated in 75Ω. Because of the series termination each output can drive long lengths of cable without overshoot or ringing of the signal. Figure 4 shows the output of the SM09 with a multi-burst frequency sweep video input.
• Figure 5 shows the same signal when the SM09 is driving 100m of low-cost coaxial cable (RG-59). Whilst some ‘droop’ can be seen, the signal shows no overshoots or ringing artifacts.

Specification

• Power : +5VDC ± 5% @ ~100mA (all outputs driven).
• Dimensions : 160mm x 78mm x 27mm.
• Video input: NTSC-M / PAL /SECAM or NTSC / PAL 960H. 75Ω input impedance. 1V pk-pk nominal input. Maximum input before clipping 1.6V pk-pk.
• Luma bandwidth: 8.5MHz ± 0.1dB.
• Gain: 0dB ± 0.5dB.
• Differential gain/phase: <1%, <1°
• K-factor: <1%
• Group delay: ±10ns
• Operating temperature: -10 – 40 degC.

Appendix A: AC-DC adaptor

The specification for the supplied AC-DC adaptor is shown in Figures 6-8.

Read User Manual Online (PDF format)

Download This Manual (PDF format)

Download this manual  >>