The datasheet for the OPA861 appears to have a math mistake in the calculation of component values for the low pass filter. If frequency is 20kHz, and R is 1k, C2=0.008uF and C1=0.004uF. The values for the 10MHz filter are correct.
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The datasheet for the OPA861 appears to have a math mistake in the calculation of component values for the low pass filter. If frequency is 20kHz, and R is 1k, C2=0.008uF and C1=0.004uF. The values for the 10MHz filter are correct.