Original question:
Hi Dear,
The customer uses the DS90CP22 chip as a 1:2 splitter, and the input and output terminals of the chip are all LVDS levels.
Do I need to terminate resistors at the input and output terminals? If necessary, how much resistance should be connected?
Hello Anna,
Yes, a termination resistor is needed. LVDS drivers are current source devices that need a resistor to convert the current to a voltage. The resistor should be placed close to the inputs. Please see image below.
For the termination resistor value, this device has extra drive strength than other LVDS devices. If terminating the line with 75Ω, the output swing will be 365mV. If terminating the line with 100Ω, the output swing will be 400mV. Just keep in mind the termination resistor should match the characteristic impedance of the trace/media.
Regards,
Josh
