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Author Topic: PCB trace impedances of integrated circuits with high input impedance  (Read 568 times)

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Offline electronxTopic starter

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PCB trace impedances of integrated circuits with high input impedance
« on: May 13, 2024, 12:18:38 pm »
There is an ADC front end IC (opamp) at the input of my ADC card and it has high input impedance, What should I set the differential trace impedance to when drawing the PCB? Does this matter much?

« Last Edit: May 13, 2024, 12:20:42 pm by electronx »
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Online moffy

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Re: PCB trace impedances of integrated circuits with high input impedance
« Reply #1 on: May 13, 2024, 01:01:43 pm »
For a 0-20kHz frequency range the trace impedance is not an issue, but if you have to run them any length keep them close to one another to reduce differential pickup.
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Offline shapirus

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Re: PCB trace impedances of integrated circuits with high input impedance
« Reply #2 on: May 13, 2024, 04:10:34 pm »
It depends on the speed of the signal (edge rise/fall times), source impedance, and the length of the traces between the source of the signal and the ADC.

What numbers are you dealing with in terms of the above?
« Last Edit: May 13, 2024, 04:12:19 pm by shapirus »
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