For the VCA822 variable gain amplifier datasheet (on page 34, figure 91) there is mention of a couple offset nulling circuits. Shown are a couple 0.1uF caps shown for decoupling purposes. Is this value ok for lower frequencies? As an example at 10kHz that 0.1uF cap has only 159ohms of impedance. Does increasing the value help the purpose of the decoupling cap at lower frequencies?
There are also a couple analog potentiometers shown, is there any reason that digital potentiometers could or should not be used? Given that "digipots" typically have a limited BW, making certain that any noise that may come for those compensation pins is/are there any other provision(s) that could be suggested?
