SD356EVK/NOPB National Semiconductor, SD356EVK/NOPB Datasheet - Page 6

• Manufacturer Part Number: SD356EVK/NOPB
• Description: EVAL BOARD FOR LMH0356
• Manufacturer: National Semiconductor

Specifications of SD356EVK/NOPB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

There is also a header on the right side of the SD356EVK board which is connected to the SD/HD
indication of the LMH0356 SDI reclocker. It is meant to control an LMH0302 SDI cable driver. The output
polarity of the signal on this header is such that it can be connected directly to the SD/HD control input of
the LMH0302 cable driver. The header on the SD356EVK board facilitates this connection.
27 MHz Reference
The SD356EVK includes an on-board 27-MHz reference crystal. In the normal configuration of the board
this crystal is active. The LMH0356 SDI reclocker includes a crystal driver circuit that produces the 27-
MHz reference clock using this crystal.
The SD356EVK also includes a connector for inputting an external 27-MHz reference if desired. In order
to disable the on-board crystal a 0Ω resistor indicated on the schematic for the board must be removed.
This permits evaluation of the operation of the LMH0356 SDI reclocker with an external reference.
SMBus Connector
The LMH0356 SDI reclocker can be controlled via a 2-wire bus very similar to the standard SMBus. This
mode of operation is reserved for factory use only.
Typical Output Waveform
A test waveform can be readily generated and used to verify proper operation of the SD356EVK. In order
to generate this output waveform, the following setup procedure should be used.
Test Setup
The test setup used for testing the SD356EVK board is shown in Figure 2. Note that the test setup
includes a SyntheSys Research BERTScope as a signal generator, eye diagram measurement device,
and bit error rate test receiver. Other equivalent instruments could be used for thse measurements. The
equipment used for testing the SD356EVK is listed in Table 2.
SD356EVK User Manual
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Rev 1.0
© 2008, National Semiconductor Corp.