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OPA2890: 1 to 4 fanout

Joe Miller1
Intellectual 325 points
Part Number: OPA2890

Dear Sir/Madam,

I am after some PCB routing advice on connecting one OPA2890 (gain of 2) to four OPA2890 (gain of 1).
The delay between the OPA2890 is not important just signal quality.

Regards Joe

  • 0
    TI__Expert 3620 points

    Hi Joe,

    There are several considerations that become more important as bandwidth increases. Generally it is good practice to keep the trace dimensions consistent between the channels. You may also want to avoid close parallel traces which can lead to coupling between the lines. Via fencing on either side of each trace is a good way to isolate traces and keep the field lines from interacting if you have to route them in close proximity. The grounded coplanar waveguide (GCPW) is a favorite of mine, even if it is a bit overkill for 250MHz, it should provide excellent signal quality.

    Best,
    Sam