Hi.
I use ADS1294 in my Designed board. I configured four channel with these :
CHnSET = 0x60 ; // Gain = 12 normal input
CONFIG3 = 0xE0 ; // internal reference : 4v
CONFIG1 = 0x03 ; // DR = 2kSPS , Low Power mode
other registers are default.
I put a single pole RC filter on each channel like that filters came in TI reference :
I don't place R21 yet.
I leave inputs float and then capture data from ADS1294. these two picture are from two separate capture :
as you can see, there are an offset which is different for every channel. where come this offset and how I can eliminate that ?
p.s. I use external signal and this problem is always. even when inputs are connect to sensor.