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ADC and DAC information

Posted: Fri Jul 18, 2014 2:49 am
by hmaarrfk
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,

Re: ADC and DAC information

Posted: Tue Jul 22, 2014 9:39 am
by Crt Valentincic
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.

Re: ADC and DAC information

Posted: Tue Jul 22, 2014 10:13 pm
by hmaarrfk
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.

Re: ADC and DAC information

Posted: Tue Jul 22, 2014 11:49 pm
by Nils Roos
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-)

Re: ADC and DAC information

Posted: Wed Oct 08, 2014 7:51 pm
by airizar
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

Re: ADC and DAC information

Posted: Wed Oct 29, 2014 10:20 am
by tggzzz
Have a look at the photos in the links on http://www.eevblog.com/forum/microcontr ... schematic/

Re: ADC and DAC information

Posted: Mon Apr 04, 2016 11:30 am
by papis_traore
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.

Re: ADC and DAC information

Posted: Mon Apr 04, 2016 3:16 pm
by AndreNe
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?

Re: ADC and DAC information

Posted: Mon Apr 04, 2016 7:58 pm
by Nils Roos
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).

Re: ADC and DAC information

Posted: Sat Nov 12, 2016 6:04 pm
by xzsawq21
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