CLINK3V48BT-133 National Semiconductor, CLINK3V48BT-133 Datasheet - Page 29

• Manufacturer Part Number: CLINK3V48BT-133
• Description: BOARD EVAL FOR DS90CR485, 486
• Manufacturer: National Semiconductor

Specifications of CLINK3V48BT-133

• Main Purpose: Interface, SerDes (Serializer / De-Serializer)
• Embedded: No
• Utilized Ic / Part: DS90CR485, DS90CR486
• Primary Attributes: Serializes 48 LVCMOS/LVTTL to 8 LVDS, 66 ~ 133 MHz
• Secondary Attributes: Transmits over 2 Meter 3M MDR LVDS Cable
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Troubleshooting
If the demo boards are not performing properly, use the following as a guide for
quick solutions to common problems. If the problem persists, contact the hotline
number listed under Additional Information section of this document.
Check the following:
Trouble shooting chart:
Problem…
There is only the output clock.
There is no output data.
No output data and clock.
Power, ground, input data and
input clock are connected
correctly, but no outputs.
The devices are pulling more than
1A of current.
After powering up the demo
boards, the power supply reads
less than 3V when it is set to
3.3V.
DS90CR485/486 Evaluation Kit User Manual
Rev. 1.01
1. Power and Ground are connected to both power connections of the board.
2. Supply voltage (2.5V and 3.3V) and current (It's around 130mA for the
3. Input clock and input data (It's best to start with one data bit.) to the Tx
4. Switches and Jumpers are set correctly or to default settings.
5. The 2 meter cable is connecting the Tx portion and Rx portion.
6. Make sure all of the connections are good.
7. Start with a low clock frequency (66 MHz) and work from there.
2.5V supply and 90mA for the 3.3V supply with clock and one data bit at
66MHz.) are correct.
input connector.
Solution…
Make sure the data scramble/mapping is correct.
Make sure there is data input.
Make sure Power is on. Input data and clock are active
and connected correctly.
Make sure that the 2 meter cable is secured to both demo
boards.
Check the Power Down pins of both boards and make sure
the devices are enabled (/PD=ON) for operation.
Check for shorts on the demo boards.
Use a larger power supply that will provide enough current
for the demo boards.
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