Please see attached schematic.
Note this is the QSOP20 package
The input range is between 100mV and 1.4Vrms @ LHS of C4
The AD8436 output buffer is configured for a gain of 10, so up to 14Vdc at pin 15
Power supply is configured for non-bi-polar operation
Is it okay to use a 21V supply only at pin 16, or is it better to use +21V at pins 16, 17 and 18?
Do you see any issues with this configuration?