Category: Datasheet/Specs
Product Number: AD8475
Hi,
I am trying to simulate the output noise from AD8475 diff op-amp using LTSpice (and using the example model coming with LTSpice). According to datasheet the broadband noise should be 10nv/Hz1/2 which makes it suitable to drive 16bit and 18bit ADC's.
As you can see from results of simulation the broadband noise is about 92nv/Hz1/2 and considering the bandwidth, that leads to RMS value of 512uv and pick to pick value of 3mv (roughly). These values are way higher than LSB of a 16bit ADC.
So my question is why I am getting 92nv/Hz1/2 instead of 10. And why datasheet claims that it is suitable for 16 and even 18bit ADC.
