Hello, I'm using the ADL5513 for a detector with low envelope bandwidth, around 0-100Hz. The ADL5513 datasheet only describes output noise density down to 1KHz. Do you have any data below 1KHz for estimating output noise? The plots show it decreasing at around 20dB/decade, but I'm assuming it must flatten out at some point...
I was able to find some extended LF noise measurements to augment each of the two datasheet measurements, Fig. 15 and Fig. 18:
Hi again Mike,
In these graphs, it's hard to tell how much of the 1/f noise is real, and how much might be from the test setup itself.
Wow. Flicker noise with a 40dB/decade slope? Hard to believe....
For what it's worth, I'm measuring a standard deviation of 0.002dB with an envelope bandwidth of 100Hz, which corresponds to 42uV rms, or 4.2uVrms/sqrt(Hz) average over that band. Looking at the spectrum of my noise, it definitely has a 1/f noise look to it, but I don't think the slope is actually that sharp...
Increasing my acquisition bandwidth to 1kHz doesn't significantly increase my rms noise, so I'm definitely dominated by low frequency noise.