ADS8900BEVM-PDK: Modifying input signal frequency on the PSIEVM

Jaime C

Part Number: ADS8900BEVM-PDK
Other Parts Discussed in Thread: ADS8900B

Hi Team,

My customer is working with the ADS8900B EVM and is now doing evaluations and ran into a few questions. With the PSI-EVM, will it only offer a 2-kHz input signal? He's noticed that by changing the frequency, he was seeing a lot more noise in his signal. Are there any guidelines for modifying this - as in, does this require changing the jumper settings or modifying anything else on the board?

Thank you,

Jaime

over 6 years ago

0 Cynthia over 6 years ago

TI__Mastermind 24940 points

Hello Jaime

The PSI can provide other frequencies aside from a 2KHz signal, but there are settings on the board that need to be changed to accomplish this. The board is equipped with optimized 8^th order filter for 2 KHz, this filter will need to be bypassed. This is probably why you are seeing an increase in noise when applying other frequencies.

To accomplish this, move both JP1 and JP3 to BP (bypass) setting. Note, that without the optimized filter, the performance will be slightly degraded.

The ADS8900B EVM Userguide has more information on the PSI

Regards,

Cynthia

0 Jaime C over 6 years ago in reply to Cynthia

TI__Intellectual 990 points

Thank you Cynthia.

This was helpful

Jaime

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ADS8900BEVM-PDK: Modifying input signal frequency on the PSIEVM