I'm working on a ADE7753 design using a Rogowski Coil for current measurement and an external 2.5V reference for increased stability. Like most coils this has a relatively low sensitivity of 460uV/A. That means at my max current of 20A I'm looking at a mere 9.2mV output.
Looking at the datasheet, Rev C, Page 16, Table 5, "Maximum Input Signal Levels for Channel 1" it appears I have two options with regard to provisioning the input range and gain:
Input Range 0.25V -> Gain = 16
Input Range 0.125V -> Gain = 8
Both options allow up to 15.6mV maximum input voltage.
The question I have is, does it matter which option I choose? Is it better to have lower gain and a reduced input range or a higher gain and increased input range? Does one result in, say, lower noise and therefore greater accuracy?