100R matching resistors location

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gvalan
Posts: 2
Joined: Wed Feb 22, 2023 4:41 pm

100R matching resistors location

Post by gvalan » Mon Mar 25, 2024 9:29 am

Hello redpitaya team and users,

I would like to use the S1 S2 differential lines to test a LVDS ADC. Bank 34 is powered with VCCO=1.8V.
One needs a matching resistor to terminate an input pair.
On 125-14 schematic, R41, R42, R43 and R44 are used for this.
Where are they located on the pcb? I don't see them on the top or bottom silkscreens.

Thanks a lot for your answer,

Guillaume

gvalan
Posts: 2
Joined: Wed Feb 22, 2023 4:41 pm

Re: 100R matching resistors location

Post by gvalan » Mon Mar 25, 2024 11:37 am

By beeping I inferred the positions. See attached image.

Would be nice to have it in red pitaya online documentation.

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redpitaya
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Joined: Wed Mar 26, 2014 7:04 pm

Re: 100R matching resistors location

Post by redpitaya » Thu May 16, 2024 2:50 pm

Hello gvalan,

Sorry for the late reply.

You can find the resistor positions here:
https://imgur.com/a/HArTt5c

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