Is there a way to invert the charge pump or phase frequency detector polarity on the LMX2572? I would like to use an active inverting loop filter and need to invert the polarity.
The datasheet makes no reference to charge pump polarity control and it's surprising that the PLL chip would lack such a basic feature.
Looking at Register 14, which controls the charge pump gain, I see a lot of bits set to fixed 0's or 1's. Is there a "factory test" bit that can change the polarity?
