AFE0064: continuous current reading

DOOHO KIM

Part Number: AFE0064
Other Parts Discussed in Thread: AFE1256, AFE2256, DDC1128, DDC264

I'm looking for an analog front-end IC with an input charge range of 0.75pC to 10.5pC.

I was wondering if the AFE0064 would be suitable for reading the continuous current of a photodiode array.

I think in the reset phase, the photodiode signal seems to be stored in the reset capacitor of the CDS.

In the diagram of the datasheet there is a switch on the input node, but I would like to know if it actually exists and if so what control signal is it operating on.

Thanks

over 2 years ago

0 Nick Zahabizadeh over 2 years ago

TI__Expert 4474 points

Hello Dooho,

The champion for this device is based in India, which is currently witnessing holidays. They'll have a response for you in 72 hours.

Kind regards,
Nick Z

0 Shriram Devi over 2 years ago

TI__Prodigy 620 points

Dear Dooho,

the AFE0064, AFE1256, AFE2256 etc. family devices are focused on charge integration. Their target application is charge packets or discrete currents, for example - x-ray panel readout.

Under some special cases, these devices can also be used for continuous current integration.

For continuous charge integration, we have other family of devices called DDC264, DDC1128, DDC2256 etc. They support continuous current integration.

https://www.ti.com/data-converters/integrated-special-function/medical-afes/computer-tomography-afes/products.html

https://www.ti.com/lit/ds/symlink/ddc264.pdf?ts=1664956022191&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FDDC264

https://www.ti.com/product/DDC2256A#features

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AFE0064: continuous current reading