ADS7056: RFLT value for 25MSPS input

Yuta Nishie

Part Number: ADS7056

Hi,

Is there a diagram for 25MSPS like the one below?

The customer is inputting a 25MSPS signal, and the output data is distorted. It is known that the cause is a large resistance value for LPF in the input stage. Therefore, we would like to know the resistance value corresponding to 25MSPS.

Best Regards,

Nishie

over 2 years ago

+1 Tom Hendrick over 2 years ago

TI__Guru**** 182761 points

Hi Nishie,

The ADS7056 cannot sample at 25MSPS, the max rate at which it can sample is 2.5MSPS. By Nyquist, the MAX signal it can sample is 1.25 MHz. There is a tool in the Analog Engineers Calculator that helps you choose the Rfilt and Cfilt values along with the necessary OPA bandwidth to drive the analog input.

0 Yuta Nishie over 2 years ago in reply to Tom Hendrick

Genius 5840 points

Hi Tom-san,

Thank you for your reply.

Sorry. I made a mistake. 2.5MSPS is correct.

I will try Tool!

Best Regards,

Nishie

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ADS7056: RFLT value for 25MSPS input