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OPA1632: OPA1632 Differential Output Controlled Impedance

EE_MT
Intellectual 390 points
Part Number: OPA1632


From my understanding, if the source pin is able to complete its edge transition before the signal reaches the load pin, then it is a good idea to control the routing impedance. With that being said, both output traces of the OPA1632 in my design are only 3inches long and the maximum frequency is 1kHz, maximum voltage is 1.5V. Would you recommend controlling the impedance or do you agree that in this case it is insignificant? 

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    TI__Genius 15975 points
    Hi Matt,

    For the 1kHz signal with 3inch long trace, controlling of the trace impedance might not be such a huge factor. However, given that the part has a high gain bandwidth (GBW) product of 180MHz, I would still recommend you to follow the layout guidelines mentioned in the datasheet for high-speed op-amp stability requirements. Even though the signal is at a lower frequency, you could still end up oscillating the part by introducing enough stray trace capacitance at the input/outputs.

    Best Regards,
    Rohit