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SD356EVK/NOPB
SD356EVK User Manual
1 of 11
Rev 1.0
© 2008, National Semiconductor Corp.
SD356EVK Evaluation Kit
Board for LMH0356 SDI
Reclocker
User Manual
Board for LMH0356 SDI
Reclocker
User Manual
National Semiconductor
EVK User Manual
EVK User Manual
Introduction
The LMH0356 Serial Digital Interface (SDI) reclocker is designed to recover a clean clock from a serial
digital video signal which may be contaminated by jitter and to resynchronize the input video data to the
recovered clean clock. The LMH0356 SDI reclocker accepts signals conforming to standards SMPTE
259M (C), SMPTE 292M, and SMPTE 424M.
digital video signal which may be contaminated by jitter and to resynchronize the input video data to the
recovered clean clock. The LMH0356 SDI reclocker accepts signals conforming to standards SMPTE
259M (C), SMPTE 292M, and SMPTE 424M.
The LMH0356 includes, in addition to the reclocking circuitry, an input 4-channel multiplexer which
permits selection for reclocking of any of four serial digital video signals at the inputs of the LMH0356. It
also includes fixed equalizers on its inputs designed to reduce the inter-symbol interference (ISI)
generated by dispersive PC board traces between the serial digital video source and the reclocker inputs.
The LMH0356 fixed equalizers are designed to compensate for the frequency-dependent loss of up to 30
inches of FR-4 PC board trace.
permits selection for reclocking of any of four serial digital video signals at the inputs of the LMH0356. It
also includes fixed equalizers on its inputs designed to reduce the inter-symbol interference (ISI)
generated by dispersive PC board traces between the serial digital video source and the reclocker inputs.
The LMH0356 fixed equalizers are designed to compensate for the frequency-dependent loss of up to 30
inches of FR-4 PC board trace.
The SD356EVK is a PC board designed to aid in the evaluation of the performance characteristics of the
LMH0356 reclocker. The SD356EVK PC board is fabricated with FR-4 PC board material. The inputs
and outputs of the LMH0356 are connected to the SMA coaxial connectors on the board using controlled-
impedance 50Ω single-ended and 100Ω differential PC board traces.
LMH0356 reclocker. The SD356EVK PC board is fabricated with FR-4 PC board material. The inputs
and outputs of the LMH0356 are connected to the SMA coaxial connectors on the board using controlled-
impedance 50Ω single-ended and 100Ω differential PC board traces.
This instruction manual describes the features of the SD356EVK. It should be used in conjunction with
the LMH0356 SDI reclocker data sheet. Schematics and PC board layout drawings for the SD356EVK
board are included separately. In addition, board fabrication files are available on request. Contact your
local National Semiconductor representative.
the LMH0356 SDI reclocker data sheet. Schematics and PC board layout drawings for the SD356EVK
board are included separately. In addition, board fabrication files are available on request. Contact your
local National Semiconductor representative.
PC Board Features
The SD356EVK is shown in Figure 1. The features of the board are described in the sections that follow.
General Description
The SD356EVK is a four-layer PC board fabricated using FR-4. The layer stackup is shown in drawing
number 980600057-001. As the drawing indicates, the nominal board thickness is .062 inches. The
board includes internal ground and power supply planes. The ground plane is the second layer of the
board (underneath the top layer) and is the reference for the controlled-impedance traces on the top layer.
number 980600057-001. As the drawing indicates, the nominal board thickness is .062 inches. The
board includes internal ground and power supply planes. The ground plane is the second layer of the
board (underneath the top layer) and is the reference for the controlled-impedance traces on the top layer.
The SD356EVK is fabricated using Pb-free solder and components and is comprised of RoHS-compliant
materials.
materials.
SDI Input and Output Connectors
The SDI input and output connectors are 50Ω SMA female coaxial connectors (jacks). These connectors
will mate non-destructively with 50Ω SMA male coaxial connectors (plugs). They will also mate non-
destructively with 50Ω APC-3.5 male coaxial connectors and 2.92 mm (K) male coaxial connectors.
These connectors will NOT mate to 2.4 mm connectors. Do not attempt to connect 2.4 mm connectors to
the SD356EVK PC board. This will damage both the board and the connected device or cable.
will mate non-destructively with 50Ω SMA male coaxial connectors (plugs). They will also mate non-
destructively with 50Ω APC-3.5 male coaxial connectors and 2.92 mm (K) male coaxial connectors.
These connectors will NOT mate to 2.4 mm connectors. Do not attempt to connect 2.4 mm connectors to
the SD356EVK PC board. This will damage both the board and the connected device or cable.