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применить последовательные резисторы (20-50 Ом), расположенные как можно ближе к АЦП.
Вот, например, что мне ответили на подобный вопрос в Analog Devices :
When the high speed digital outputs change state, the output
drivers have to charge or discharge the line capacitance very quickly.
The current which passes in the output stage and the fast slew rate of
the output can degrade the noise performance of the ADC. Therefore,
series resistors are used to reduce the slew rate of the outputs and
limit the current, as a way of imroving the noise performance of the
ADC.
Успехов!
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