Forum Post: ADS1278 unwanted bitshifts in the Dout signal

Hello,

i am using ADS1278 EVM with the SPI interface (on board osc with 27 MHz, SPI SCLK = 12,5 MHz from the µC).

An oscilloscope shows me that the whole bitpattern is shifted to the left, sporatically. When i look at the acquired signal i see unregular peaks. i measured the peak values and also found that these values are the "regular values" shifted by one bit to the left.

Can you tell me how to avoid these shifts? How can i find out if the ADC is working correctly?

Thanks in advance and regs,

Marcel