ADC and DAC information

Placement, modules, components and accessories; the ones that exist and the the nice-to-be's
hmaarrfk
Posts: 26
Joined: Fri Jun 27, 2014 3:19 pm

ADC and DAC information

Post by hmaarrfk » Fri Jul 18, 2014 2:49 am

Hello,

I'm just starting to play around with the RedPitaya and it is a pretty nifty device.

Is there any chance you can give us the part numbers for the ADC and DAC for the v1.1 board?

Is undersampling possible with these ADCs?
Can they perform at higher, lower clock to reduce pipeline delay?

Thanks,

Crt Valentincic
Posts: 67
Joined: Wed May 28, 2014 12:15 pm

Re: ADC and DAC information

Post by Crt Valentincic » Tue Jul 22, 2014 9:39 am

Red Pitaya is equipped with LTC2145CUP-14 and DAC1401D125HL from Linear Technology. I would kindly suggest that you take a look at their datasheets and specifications to find out all the details.

hmaarrfk
Posts: 26
Joined: Fri Jun 27, 2014 3:19 pm

Re: ADC and DAC information

Post by hmaarrfk » Tue Jul 22, 2014 10:13 pm

Great thanks.

Do you have any plans on releasing some kind of schematics for the hardware? I am mainly interested in the filtering/buffering circuitry for the high speed ADC and DAC (if any).

Are the programming pins of the ADC connected?
From the file:

Code: Select all

RedPitaya/FPGA/release1/fpga/code/red_pitaya.xdc
, it doesn't seem like they are.

Nils Roos
Posts: 1441
Joined: Sat Jun 07, 2014 12:49 pm
Location: Königswinter

Re: ADC and DAC information

Post by Nils Roos » Tue Jul 22, 2014 11:49 pm

The small detail that the conversion to 2's complement is done in fpga fabric - instead of programming the ADC to do the conversion - might serve as a further hint to answer this question 8-)

airizar
Posts: 10
Joined: Wed Jul 09, 2014 4:25 pm

Re: ADC and DAC information

Post by airizar » Wed Oct 08, 2014 7:51 pm

I'm working in an application that requires compensating the frequency changes in the oscillator with time, temperature, voltage, etc. would it be possible to know the part name of the 125MHz crystal oscillator?

Thanks

tggzzz
Posts: 4
Joined: Wed Jun 18, 2014 10:04 pm

Re: ADC and DAC information

Post by tggzzz » Wed Oct 29, 2014 10:20 am

Have a look at the photos in the links on http://www.eevblog.com/forum/microcontr ... schematic/

papis_traore
Posts: 2
Joined: Wed Jan 13, 2016 11:10 am

Re: ADC and DAC information

Post by papis_traore » Mon Apr 04, 2016 11:30 am

Hello,
I am using Redpitaya board for fpga development and i want to know if it is possible to sample the ADC at 50 MHz.
Thanks for your help.

AndreNe
Posts: 15
Joined: Mon Feb 22, 2016 11:47 am

Re: ADC and DAC information

Post by AndreNe » Mon Apr 04, 2016 3:16 pm

Hi,
I like to change the ADC (LTC2145-14) against a 16 bit variant (LTC2185-16) but the needed pins (43 and 44) are grounded. Is a future version of Red Pitaya planned with the connection to the necessary FPGA pins?

Nils Roos
Posts: 1441
Joined: Sat Jun 07, 2014 12:49 pm
Location: Königswinter

Re: ADC and DAC information

Post by Nils Roos » Mon Apr 04, 2016 7:58 pm

papis_traore wrote:I am using Redpitaya board for fpga development and i want to know if it is possible to sample the ADC at 50 MHz.
You can disconnect the 125MHz crystal oscillator and use either an external clock source or a clock generated in the FPGA in its place. For the latter scenario, you'll need to design a clock source into the FPGA logic. In both cases, some soldering is required (see here).

xzsawq21
Posts: 2
Joined: Sat Nov 12, 2016 5:56 pm

Re: ADC and DAC information

Post by xzsawq21 » Sat Nov 12, 2016 6:04 pm

AndreNe wrote:Hi,
I like to change the ADC (LTC2145-14) against a 16 bit variant (LTC2185-16) but the needed pins (43 and 44) are grounded. Is a future version of Red Pitaya planned with the connection to the necessary FPGA pins?
I have the same problem
Can I order Red Pitaya with a 16-bit ADC and zynq 7020?
I want the Calibrated kit.

Regards

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