ADC3643EVM: Schematics and Pspice for TI

Ho Claus,

The components in the red box can be removed and are not required when connecting the THS4541 amplifier.

With the input amplifier network, the input signal would need to be roughly, 1Vpp or less in order to achieve the FS of the ADC.

The glitch filter can be modified or removed depending on your application.

What BW are you trying to use for this application? Do you have any AC performance requirements?

Such as SNR, SFDR, etc? This will help provide some guidance here.

Regards,

Rob

Hi Rob,

Thanks for the quick reply.

My application should initially be designed for DC to 10MHz. So far I have a loose requirement of an SNR of 75dB or better. Would that be reasonable out of a circuit like the ADC364xEVM?

I read in a TI document that for frequencies below 5MHz the THS4551 should be considered instead of THS4541. Would that apply to ADC364x as well? If yes, what about the 5MHz to 10MHz range?

Regards,

Claus

Hi Claus,

Can you share the document that you are referring to?

Regards, Amy

Hi Claus,

Looking at the two THS devices, not sure where the 4551 amplifier would be a better fit. We can certainly provide a solution from DC to 10MHz using the THS4541. Please let us know if you want us to forward.

Regards,

Rob

Hi Amy,

In my notes I found a reference to "TIDUBS9A–August 2016–Revised October 2016". On page 5 and 16 it says to consider THS4551 for applications below 5MHz. I believe I have seen the same comment in another document as well. Just can't remember where.

In "TIDA-00294-August 2014" on page 7 it says to consider THS4521 for applications below 5MHz. But on the THS4521 product page it pretty much says THS4551 is better device.

Regards,

Claus

Hi Rob,

Yes please. That would be great if you can forward a DC to 10 MHz solution. Thanks.

Regards,

Claus