Datasheet

DS25BR100EVK User Manual
DS25BR120 (U3) Evaluation
The DS25BR120 is a 3.125 Gbps LVDS buffer featuring four levels of transmit pre-emphasis (Off, Low,
Medium and High). The following is a recommended test setup procedure for the device evaluation. Figure
4 depicts a typical setup and instrumentation used for the device evaluation.
1. Apply the power to the device (3.3V typical) between VDD and VSS banana plug receptacles.
2. Connect desired STRIPLINE to the output of the device using short 50-ohm coaxial cables (e.g.
PE-SR402-AL from www.pasternack.com).
3. Connect a signal source (i.e. signal generator or an LVDS driver) to the IN3 inputs on the board
and adjust the signal parameters (VOH, VOL, VCM) so that they comply with the device input
recommendations.
4. Select pre-emphasis level by setting the PE0 (CON5) and PE1 (CON6) pins to L or H. Refer to
Table 3.
PE1 PE0 Pre-emphasis Level
0 0 Off
0 1 Low
1 0 Medium
1 1 High
Table 3. Pre-emphasis Level Selection
5. Connect the OUT3 outputs to an oscilloscope and view the output signals with an oscilloscope
with the bandwidth of at least 5 GHz.
Figure 4. DS25BR120 Test Setup Example
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