pavel-demin/qmtech-adc

Suggestion: Dual channel ADC

Opened this issue · 1 comments

hennichodernich commented

Hi Pavel,

cool project! I wondered why you didn't choose the LTC22xx family of 2-channel ADCs. There you can find pin-compatible ADCs from 12bit @ 25MSps up to 14 bit @ 105MSps, so people could choose the ADC based on their budget. Plus you get a free second channel to do multi antenna stuff with!

I used the LTC2291 and LTC2292 in my SDR projects. (See e.g. https://radiosocial.de/@hennichodernich/109790492655017535 , and my talk https://www.youtube.com/watch?v=iiQqIhApRIo )

best regards,
Henning DC4HP

pavel-demin commented

Thank you for your interest in this project.

This project is still at the proof of concept stage. So having additional features like two ADC channels is not a goal at the moment.

The concept that I am trying to prove is a possibility to make a low cost (under $200) receiver-only alternative to the Red Pitaya SDRlab 122-16 board that would meet the requirements of the Reverse Beacon Network.

The current requirements for the whole system:

  • low price
  • 16 receivers each with at least 192 kHz bandwidth
  • compatibility with CW Skimmer Server

The requirements for the main board:

  • low price
  • Zynq 7020
  • Gigabit Ethernet
  • available schematics

The requirements for the ADC board:

  • low price
  • at least 65 MSPS
  • at least 12 bits
  • parallel LVDS ADC outputs

I chose the AD9255 ADC because it offered the best combination of availability, price, and performance of ADC chips meeting the requirements and available from JLCPCB.

I chose the QMTECH XC7Z020 board because at the moment it is the only one that meets all the requirements.