I am looking for a power amplifier which can drive from 100mA up to 500mA (differential output) into an inductive load (it is just 100uH I guess).
The design is a servo loop. The loop bandwidth is DC to 100Hz only, but I need all the low noise I can get,especially at very low frequencies.
Power is +/-5V. In the moment I am using a AD815.
I was thinking about the AD8398A which does 450mA and has 4.8nV/rtHz but I am not certain how it behaves at e.g. 1Hz.
I rather ask than make a PCB, waste a week and $1K.