Find alternative ICs for AD7173 and OPA2111

[CloudyPadmal]

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]

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.

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[CloudyPadmal]

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 👍

[Niharika248]

Thats great thank you i will check up on furthur issues

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On Thu, Mar 28, 2019 at 2:17 PM Padmal ***@***.***> 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 <#55 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AnnM1lrcnZB8bxWO5dxods9IIEUhlfYSks5vbHUKgaJpZM4Y4xat> .

[tharaka27]

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]

Hi, We are expecting following features;

• Price
• Resolution (Need to check the optimum bits needed to have quality signal. This can be achieved either by amplifying the signal to a higher voltage, quantize with lower resolution ADC chip or not putting much effort on amplifying stage and use a high resolution ADC chip)
• Dimensions and package of IC
• Power consumption and levels
• Number of channels (8 preferable)

[arishuynhvan]

@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?