Hi all,
I am using LVDS signals around 500 Mbps.
Currently upgrading to a crosspoint switch with pre-emphasis. Looking into SCAN90CP02 but don’t want to use JTAG feature. I looked for other options for crosspoint with pre-emphasis, DS25CP102 was the only other one I found from TI but this one was too costly.
Link to tech docs for SCAN90CP02
Q1: If using SCAN90CP02 and not using JTAG with it, can I simply leave those pins N/C? Or will I need pull-ups/pull-downs? If so, which ones will need ups/downs? The evaluation sheet wasn’t very helpful here since I don’t wish to ever use this feature and I could use some advice.
Q2: SCAN90CP02 has five power inputs. The data sheets states “at least 4 low ESR 0.01 µF bypass capacitors should be connected from VDD to GND plane.” However, the evaluation kit document schematic (http://www.ti.com/lit/ug/snlu078/snlu078.pdf) shows two caps at each power input . I have limited space on my board and don’t want to use this many caps if need be. I think one 0.01 µF bypass cap at each power will suffice but wanted another opinion on this.
Q3: I didn’t see any mention of internal pull down/up resistors within the chip for the select and enable pins. I wanted to simply double check that I needed to pull the select and enable pins to ground externally if I want to input logic “0”.
If you could help me out quickly, that would be much appreciated!
-Thomas