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Forum Post: ADS9218: Unused LVDS Pin Termination

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Part Number: ADS9218 Tool/software: Hello! I'm using the ADS921x family in a design (specifically the ADS9218) operating in single-lane mode. Additionally, our HDL team is using test patterns to calibrate alignment such that FCLK and DCLK are not necessary for all parts in our multi-ADC design, so for some ADS9218 parts we have a number of unused/unconnected pins on the ADC LVDS interface. My question is -- if there are unconnected DCLK, FCLK, and/or DOUT LVDS pairs on the ADS9218 interface, is there a recommended termination style for them (i.e. 100ohm diff) or can they be left floating without impacting performance?

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