DriveCable02EVK User Manual
Follow these steps to set up the DriveCable02EVK for evaluation with 50-ohm coaxial cables:
1.
Configure DriveCable02EVK board:
a)
Provide 3.3 V between the J2 (VDD) and J1 (GND). This powers all devices on the board.
b)
Set DS15BA101 (U1) output voltage amplitude to 0.8 V by using JP1.
c)
Enable DS15EA101 (U2) outputs by setting its EN* pin to low. This is accomplished by
placing a jumper across the GND and SIG pins of the connector JP2.
d)
Remove R8 and place 50-ohm to GND termination on the DS15EA101 input that will be
used (R9 or R10) and 25-ohm to GND termination on the DS15EA101 input that will NOT
be used (R9 or R10).
2.
Connect the cable driver inputs to a signal source (e.g. Pattern Generator).
e)
Note the AC-coupling capacitors on the inputs (SMA1 and SMA2)
f)
Adjust the signal parameters (VOH, VOL, VCM) so that they comply with the DS15BA101
input requirements.
g)
If DC-coupled interface is desired, use 0-ohm SM0402 resistors in place of the C1 and C2.
h)
There is a provision to add an optional resistor divider network (R12 and R13) on the
DS15BA101 inputs in case one desires bias the signal externally (there is an internal biasing
network on the DS15BA101 inputs). In addition, the JP3 connector provides signal biasing
provision for a voltage source.
3.
Use SMA-to-BNC Adapters (i.e. PE9074 from www.pasternack.com) if necessary (in case coaxial
cable has BNC connectors).
4.
Connect a coaxial cable assembly with coresponding connectors on its ends.
5.
The LED1 will illuminate if the DS15EA101 (U2) detects a valid signal.
6.
Connect equalizer outputs directly to an oscilloscope or a bit error rate tester (BERT) receiver
using good quality coaxial cables. Note that the equalizer outputs have internal 50-ohm pull-ups
and that there are on-board AC-coupling capacitors.
7.
Observe the results on the oscilloscope or BERT receiver.
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