Hi Bill, Not quite yet, but we are working on a board that could do 2.2 GSPS non-interleaved. It is called the adc1x2200-10 which indicates 1 channel, 10 bits, 2200 MSPS. It is based on the e2v AT84AS008 part with associated DMUX and the status is that we have a PCB design, PCB's and components ordered and assembly booked. If all goes well we should be able to get some measurement results out within the next two months.
This may be an option depending on your schedule? Regards, Francois On Wed, May 30, 2012 at 2:57 PM, Bill Petrachenko <[email protected]> wrote: > OK, so it looks like I'll need to pay more attention to interleaving than > I had hoped. I assume there are no ROACH-compatible boards that use chips > that clock at 2048-MHz but without interleaving. > > Also, we're using a flexible down-converter to select 1-GHz bands anywhere > in the 2-14-GHz range. At many sites RFI at S-band will be a problem so > dynamic range is an issue. The chips on the ASIAA, ADC1x3000, and Kat-ADC > all seem to drop to about ENOB = 6-bits at 2-GHz which is less than ideal. > Using a 10- or 12-bit sampler would be preferred but it seems no > ROACH-compatible sampler boards have been designed with 10- or 12-bit > capability and the interface won't handle the extra bits anyway. Having > said that though I seem to recall that you implied in your initial email > that the ASIAA card could be used in the dual sampler mode (assuming a > 1-GHz bandwidth) if interaced to the ROACH2 and yet the ZDOK connection for > both ROACH1 and ROACH2 both use a 40 differential pair interface. How do > you get the extra bandwith with the ROACH2? > > Yes, I did pick up that we would need the higher bandwidth filter. > However, I also noticed that there were some plans to implement shields and > heat sinks for the Kat-ADC. Has this come to pass or has it become apparent > that neither are required? > > Many thanks, > -Bill. > > *From:* Dan Werthimer <[email protected]> > *To:* Bill Petrachenko <[email protected]> > *Sent:* Monday, May 28, 2012 11:21:40 PM > *Subject:* Re: [casper] 1-2 GHz sampler > > the kat-adc has two different front end fiilter options. > make sure to order the filter option for high frequency. > > dan > > On Mon, May 28, 2012 at 7:19 PM, Bill Petrachenko <[email protected]> > wrote: > > Thanks Dan. It sounds like the Kat-ADC is probably best for us. > > > > -Bill. > > > > ________________________________ > > From: Dan Werthimer <[email protected]> > > To: Bill Petrachenko <[email protected]> > > Cc: Casper <[email protected]> > > Sent: Monday, May 28, 2012 8:47:45 PM > > Subject: Re: [casper] 1-2 GHz sampler > > > > > hi bill, > > > > i think all the boards you mention have analog bandwidth out to 2 GHz, > > so they should work well for your 1-2 GHz band. > > > > the asiaa board is the least expensive, but this board does not have > > programmable > > attenuators like the Kat-ADC. the asiaa board can be used as a single > > 5 Gsps ADC, or as a dual 2.5 GHz ADC. > > we have used the asiaa board as a single 5 gsps adc, and it works quite > > well. > > but we have never tested it as a dual adc - perhaps others reading > > this email can > > give you advice about using it in dual mode. if you are using roach > > I, you can't > > get the 8 bit version of the asiaa board working at the full 5 gsps. > > if you are using > > roach II, you can use it at 5 Gsps. > > > > best wishes, > > > > dan > > > > > > > > > > On Thu, May 24, 2012 at 11:30 AM, Bill Petrachenko <[email protected]> > wrote: > >> I'm designing a digital data acquisition system using a ROACH1 board. I > >> need > >> to sample two Nyquist zones at 1024-2048 MHz. It appears that in the > >> Casper > >> group of products, a pair of ASIAA, ADC1x3000-8, or KatADC boards would > >> work > >> well and nicely interfaced to a single ROACH1 board (although the ASIAA > >> board is not mention explicitly on the web-site). Is there any reason to > >> choose one board over another? The gain adjustment stage is attractive > on > >> the KatADC but the performance of the ADC1x3000-8 chip seems marginally > >> better at 2-GHz input frequency. The e2v chip seems less established > than > >> the National chips. Is interleaving or calibration an issue for any of > the > >> chips? > >> > >> I'd be grateful for any opinions on this. > >> Thanks, -Bill. > > > > > > > -- Francois Kapp Sub-system Manager Digital Back End meerKAT SKA South Africa Third Floor The Park Park Road (off Alexandra Road) Pinelands 7405 Western Cape South Africa Latitude: -33.94329 (South); Longitude: 18.48945 (East). (p) +27 (0)21 506 7300 (p) +27 (0)21 506 7360 (direct) (f) +27 (0)21 506 7375 (m) +27 (0)82 787 8407
