August 11, 2008
Rev. 1.0
© 2008, National Semiconductor Corp.
3
DS91M125 Evaluation in a Point-to-Point Link
The following is a recommended procedure for using and evaluating the DS91M125EVK. Figure 2 depicts a
typical setup and instrumentation used.
1. Select a single DS91M125 evaluation board.
2. Apply the power to the board (3.3 V typical) between J3 and J4 power tabs, observe the value of I
CC,
and compare it with the expected value (refer to the datasheet) to ensure that the devices are
functional.
3. Enable one of the U2 driver outputs. This is accomplished by setting the DE0-3 pin to VDD (JP3-6).
4. Connect a signal source to the driver input (DI+, DI-). The signal needs to be an LVDS/M-
LVDS/CML/LVPECL compliant signal. Refer to the DS91M125 datasheet for the receiver input
compatibility.
5. Connect one of the U2 outputs (A0-3/B0-3) to an oscilloscope and observe the waveforms.
Figure 2
– DS91M125 Test Setup
