Other Parts Discussed in Thread: ISO122
Hi all,
I am using ISO122 in my circuit to isolate a analog signal from 20mV to 10V range.
I found if I measure the ISO122 output, I could see two things:
1. the 500KHZ oscillations with 30mVpp (expected, not an issue with low pass filter)
2. However, even i short the input to GND, I could see the envelope/common-mode ripple of this 500KHz is not steady, which itself has a 5mVpp ripple at much lower frequency. After the low pass filter in next stage this envelop give me trouble reflected as a ADC ripple.
I would like to ask if this common-mode ripple is expected on this IC or Not?? any one have the same experience, or any idea where this common-mode ripple comes, PS i used a linear Power supply for testing, so should not be coupled from PS.
Many Thanks!!