Hi Charles, Thanks for your help. Sorry, I made a mistake. The the +-5V power supply's current is 0.075A and dropped to 0.013A when increase the Rref resistor from (RREF = 6.25 kΩ → IS = 8mA) to (RREF = 50 kΩ → IS = 1mA). And I think the low frequency noise comes from LM96530 . Because even I turn off the LM96530 's 8 channel, the AFE5803 still can receive a low frequency noise. But when I disconnect the LM96530 and the AFE5803 , its gone. Best, Phx
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