Other Parts Discussed in Thread: ADS8881, ADS7056, ADS7853, ADS7042
We have a spectrum analysis problem where we need to analyze a signal in the 490 kHz to 520 kHz range.
The signal will be bandpass filtered before sampling occurs, so an undersampling approach is feasible.
In order to minimize signal chain hardware and maximize dynamic range, I'd like to throw a ~16b SAR converter at this problem, and then perform an FFT on the data stream (this is the simplified description).
Please suggest a few SAR converters with an appropriate sample and hold time that would work here. Clearly there are a variety of Nyquist zones available, so there are some trade-offs to consider.
I'm thinking a device such as the ADS8862 will work, but the usual spec I would look for related to the sampling aperture time isn't listed.
There is an "Acquisition Time" listed of 540 ns, but I'm not sure this has the same meaning. Please clarify.
There is an "Aperture Delay" of 4 ns; if this is the sample/hold time, this would be great.
If you have other suggestions for devices, please let us know.
Thanks, Best, S. Dunbar, AFA Colorado