Hi Ross, One point to clarify, the 5000 refers to the samping rate, not the total bandwidth. So a single ADC1X5000 demux 1:2 will give you 5000 Msps at 4 bits per sample, allowing you to sample signals up to 2.5 GHz bandwidth. With a single board, you'd need to put the board in the mode that instead acts as two ADCs each providing 2500 Msps at 4 bits per sample, hence you'd be able to correlate two signals each of up to 1.25 GHz bandwidth. With two ADC cards, you could correlate two 2.5 GHz BW signals.
Glenn On Tue, Feb 12, 2013 at 3:53 PM, Ross Williamson <rwilliam...@astro.caltech.edu> wrote: > Hi All, > > I'm new to CASPER/ROACH boards and so apologies if this is obvious. We are > hoping to build a simple 2-channel correlator with a fairly high bandwidth. > We are in the process of ordering a ROACH-1 board and I was thinking of also > purchasing the ADC1X5000-8 ADC - A few questions: > > 1) Should I even be looking at an ADC1X5000-8 for use as a correlator? > 2) I believe I need the DMUX 1:2 version to work with ROACH-1 board - is > that correct? > 3) I should be able to run 2 channels at 2.5GHz 4bits with a single board - > correct? > 4) If I wanted to could I purchase another ADC1X5000-8 and try and run with > 5GHz bandwidth on each channel using the ROACH-1? > > Best regards, > > Ross > > -- > Ross Williamson > Research Scientist - Sub-mm Group > California Institute of Technology > 626-395-2647 (office) > 312-504-3051 (Cell)
