ADP3450 analog oscilloscope frontend

[algailani]

Hi,

The 14-bit resolution analog channels are interesting. Do the ADP3450 combine that resolution with a PGA (programable gain amplifier)?

For example, if I"m measuring a 1 mV pk-pk signal, will it be possible to utilize the entire 14-bit resolution on that signal?

Thanks

[JColvin]

Hi @algailani,

I have moved your question to a more appropriate section of the Forum.

You can see the specific resolution limitations for the ADP on it's page here: https://reference.digilentinc.com/reference/instrumentation/analog-discovery-pro-3x50/specifications#analog_input_channels. Notably the Absolute Resolution is limited to 0.125 mV or 3.05 mV depending on the scale (which I presume is dependent on an internal PGA) being used.

Let me know if you have any questions about this.

Thanks,
JColvin

[attila]

Hi @algailani

The scope inputs have two range steps, no PGA.
The samples are stored at 16bits so at lower rates (<=25MHz/31.25MHz) the capture resolution is about 30uV.
For noise consideration you could also try amplifying the signal, similar to an active probe.