Texas Instruments SD387EVK Evaluation Board SD387EVK/NOPB SD387EVK/NOPB Datenbogen

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SD387EVK/NOPB

FIGURE 1. SD387 Evaluation Board

Inputs and Outputs: BNC_IO Input/Output, SDI Input, and SDO Output

The bidirectional I/O (J1) is a 75

Ω BNC connector. When the LMH0387 is configured as an input, the input signal

on the BNC_IO pin should conform to the SMPTE 424M, SMPTE 292M, or SMPTE 259M standards. When the
LMH0387 is configured as an output, the BNC_IO pin will drive SMPTE SDI signal levels (800 mV

P-P

into 75

Ω).

The SDI input connectors (J2 and J3) are 50

Ω SMA connectors. This cable driver input includes a 100Ω differential

termination resistor (R5) at the LMH0387 device and is optimized for 100

Ω differential input.

The SDO output connectors (J4 and J5) are 50

Ω SMA connectors. When using only one side of this equalizer

output pair, the other side should be terminated with a 50

Ω SMA termination. For example, when only using the

SDO output, SDO

¯¯¯¯ should be terminated with a 50

Ω SMA termination.

SD387EVK User Guide

2 of 23

Rev 1.1