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ADV7842 analog input resistances


I saw ADV7842 evaluation board schematic and it uses a combination of 51.1R and 24R resistors. My question is, can I just replace them with a single 75R termination resistor to ground from each analog video signal (composite, component, s-video, rgb, vga...etc)?


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  • FormerMember
Sep 14, 2021 in reply to VEGETA +1 verified

Yes, place 2 resistors close to the connector.  Use 50 Ohm traces from there.  Don't forget the DC blocking caps.

The 25 + 50 to ground will match the 75 Ohm cable.  The 7842 input is high impedance so…