DS125BR800AEVM Datasheet, PDF (5/18 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – SMA evaluation kit provides a complete high band-width platform to evaluate the signal integrity

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4-Level IO Control
2 4-Level IO Control
Many of the control pins on the DS125BR800A have more than two valid levels. Table 1 below shows how
to access each of these levels with the switch banks on the back side of the EVM.
Table 1. Switches to set the 4-Level input control pins
4-Level Input Settings
0 - Tie 1 kΩ to GND
R - Tie 20 kΩ to GND
F - FLOAT (open)
1 - Tie 1 kΩ to VIH
Setting for 3-pin switches (3-2-1)
ON - OFF - OFF
OFF - ON - OFF
OFF - OFF - OFF
OFF - OFF - ON
The following switches are used to set the input condition for the 4-level inputs:
• SW1, SW2, SW3, SW5, SW6, SW8, SW9
There are 3 switches connected to an input signal pin. Each switch when set to the ON position sets the
pin to one of the 4-level setting. The 6-pin switches are assigned similar to the 3-pin switches. The only
difference is 2 signal pins are connected and thus 6-5-4 is for the one signal pin and 3-2-1 is for another
signal pin.
NOTE: Only 1 switch at the ON position is allowed. Activating more than one switch concurrently
results in an indeterminate voltage level.
SNLU151 – September 2013
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DS125BR800AEVM Evaluation Kit
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