AFE0064: Designing with AFE0064 and AFE2256

Hi Archie,

What I understand is you have a 128 channel current to digital conversion requirement.

You can use two AFE0064 to sense total 128 channels. They can share the digital control signals (IRST, SHR etc.) from the FPGA. The ADC0064 has analog output. It will need external ADC (e.g. ADS8363) for digitization.

the AFE2256 is fully integrated device with 256 low-noise charge integrators followed by high-performance ADC. It can achieve faster scan time at lower power than AFE0064.

Both, the AFE0064 / AFE2256 can accept bi-direction current.

yes, there are EVMs available for these devices.

More parameters (power, noise, package, speed etc.) need to be considered to select optimal device for your application. There are different tradeoffs to select AFE0064 vs AFE2256 vs any other device from this family of devices.

Kindly note that the AFE2256 is NDA restricted device. So, if you are interested in AFE2256, we can discuss more over email.

Hello Shriram.

Sorry for the late update as client just provided his feedback as follows:

"Thank you for the feedback and it was helpful in understanding some parts of the issues I am facing. However, as I have read and tried to understand more about the product, I have stumbled upon a few more questions, and hence would like some clarification on them as well.
1. Your reply had mentioned that we have an Evaluation board for AFE0064. However, I do not find any mentioned on the website. Can you confirm that again?
2. I believe I am slightly confused about 'min scan time' and 'max data transfer rate'. Can you explain how can we achieve both simultaneously?
3. How can we understand the relation between the max data transfer rate of our AFE and the sampling rate of ADC? I understand there are many factors that go into the selection of ADC (SNR, power, etc), but essentially, can you recommend the sampling rate that we would need for max data transfer from AFE?

Just to give you more context: We wish to build a system that scans from a 128 channel detector device at a very high speed (used imaging application). Now, our lab already has an AFE2256EVM board, but need to build a new one that's programmable with FPGA and can be used for any variable of channels in the future. Hence I was looking into this AFE0064, which is quite a state-of-art at this point of time to be used with an ADC, which in turn can be used directly with an evaluation board, or an FPGA. I hope this clarifies our plan and requirements."

For your guidance. Thank you.

Regards,
Archie A.