Hi,
I'm using the ADS1299 with a bipolar analogic power supply (+2.5,-2.5V) and a 3.3V digital power supply, as suggested in the datasheet. A microcontroller, also powered by a 3.3V powe supply, is in charge of the SPI communications. I observed the SCLK signal with an oscilloscope and I found that the voltage level was not 3.3V but approx. 1.5V. I didn't find a short circuit in the PCB. I've tested the microcontroller, and the SPI work fine; the problem comes when I connect the ADS1299. I've checked the design and apparently everything is according to the datasheet. Do you have any idea of what I am doing wrong? Thank you in advance.
Juan Manuel.