AD8307 Datasheet page 20 shows a 4-pole low pass filter design. As far as I know it seems to be a sallen-key topology.
The datasheet states that changing the capacitors of C5~C7 will change the cut-off frequency.
But in reality, it seems that the cut-off changes only when C6, C7, and C8 are changed.
And the C5 doesn't seem to affect the cut-off.
What do you think?