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LM324: Long output of operational amplifier leads to self-excited oscillation

Part Number: LM324
Other Parts Discussed in Thread: TMS320F28035

The operational amplifier LM324 collects three-phase electrical inputs, and the output of the operational amplifier is sent to the AD port of the chip TMS320F28035. When there is no three-phase electrical input, the operational amplifier forms oscillations, and the output line of the operational amplifier is too long. What measures can be taken to eliminate the self-excited oscillation of the operational amplifier? Explanation: What measures should be taken when the layout of the circuit board has been determined, that is, the distance from the output of the operational amplifier to the AD sampling port remains unchanged?

Thank you!