ADS1299: ADS1299 SPI clock rate issue

Part Number: ADS1299

Tool/software:

Hello,

I've managed to communicate to my ADS1299 custom board successfully. The problem is it limited to 5MHZ SPI clock rate. More than this results in unsuccessful writing and reading ADS1299 registers.

  • I perform the required POR and RESET sequence after Power Up
  • Set the SPI timing as suggested in the ADS1299 datasheet
  • I've checked the SPI bus with my 200MHz oscilloscope and every seems correct.

Has anyone else run into this problem?

Why might this happen? How can I set a successful communication at 8MHz SPI clock rate?

Thanks in advance,
Gaston