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fossasia / neurolab-hardware

Neurolab Hardware
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Find alternative ICs for AD7173 and OPA2111 #55

Open CloudyPadmal opened 5 years ago

CloudyPadmal commented 5 years ago

AD7173 IC is the heart of the Neuro Lab device. But this IC costs nearly 17 USD. Do some research on finding a cheaper version with similar or close capacities to this IC and evaluate the possibility of a replacement.

Similarly, OPA2111 is in a DIP package. It has pins that needs to be soldered differently than the SMD ICs. This will affect the manufacturing. Find an alternative to this IC which is in SMD packaging.

Niharika248 commented 5 years ago

AD7173-8 series IC can be replaced with AD7172-4 which is of same AD717X series and has got similar features to that of AD7173 IC the only difference is it has True Rail to Rail buffers. Price - AD7172-4 IC costs approx $7.8 USD which is almost 10 times lesser than the existing IC

OPA2140 has got SMD packaging structure and has similar capacities to OPA2111 IC.

CloudyPadmal commented 5 years ago

Hi, thank you very much for the findings.

Niharika248 commented 5 years ago

Thats great thank you i will check up on furthur issues

On Thu, Mar 28, 2019 at 2:17 PM Padmal notifications@github.com wrote:

Hi, thank you very much for the findings.

  • AD ICs seems to have $1 difference and AD7173 has 16 channels while AD7172 has only 8 channels. But this selection would be good and lets take it into consideration.
  • OPA2140 is a good choice 👍

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/fossasia/neurolab-hardware/issues/55#issuecomment-477487263, or mute the thread https://github.com/notifications/unsubscribe-auth/AnnM1lrcnZB8bxWO5dxods9IIEUhlfYSks5vbHUKgaJpZM4Y4xat .

tharaka27 commented 5 years ago

Can't we generalize what we expect from this alternative IC for AD7173? So it will be easy for anyone who is searching for an alternative IC.

  1. Analog to Digital converter
  2. 24bit resolution
  3. 16 channel
  4. Sigma delta architecture

is this all?

CloudyPadmal commented 5 years ago

Hi, We are expecting following features;

arishuynhvan commented 5 years ago

@CloudyPadmal AD7770 and AD7779 seem like possible alternatives given the key features mentioned. Please check out the comparison table in this link

May I also know if the inbuilt digital filters (sinc1,3,5) of AD7173 will be used?