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Hi. i Just Designed and finished my board (ADS1299 + ARduino Pro mini(ATmega328) ) and every thing seems fine.i can read and write the registers and i can get the correct data from noise measurement and temperature sensor and i can change the gain of the channels but when i want to set the channels for internal testing they return the positive amplitude of internal test signal and they don't toggle to negative amplitude .in other words in any case of test signal, all i get is a DC signal (but i configure the register CONFIG2 with this 0b11010000) and channels, 0b00000101....i don't know why they don't toggle and give me a square signal...every other thing is normal.BTW i am using external clock(2.048MHz) for ADS1299 and CLKSEL=0 (tied to GND). thank you for reading this question and problem.(here is a picture of what i get). the datas are in Microvolts and noise is -500uV. so i get the correct amplitude of test signal which in my case is 1.8mV. I appreciate any suggestion