Other Parts Discussed in Thread: ISO7741, ISO6741, ISO7341C
We are using the ISO7841DWW part to isolate an ADC which is continuously measuring 240V mains voltage. We have diagnosed some data corruption to the ISO7841 during transmission from our 2G/3G/4G modem. We have found that applying an RF burst with a carrier frequency of 800MHz results in the following behaviour.
ISO7841 input without RF
ISO7841 input with RF
ISO7841 output without RF
ISO7841 output with RF
As you can see in the last image, the signal edges are no longer stable and are showing significant jitter. Under these conditions the ADC data is corrupted.
We then replaced this part with a IL717-3E isolator and the issue was removed.
IL717-3E output with RF
See how the edges are stable.
We have tried various solutions (including the solutions given in this similar post e2e.ti.com/.../iso7841-carrier-frequency-and-gsm-immunity ) to remove this issue with the ISO7841. However we have had no luck. Can you provide information as to why the ISO7841 part is more susceptible to GSM interference than other isolators, and if there is any other methods which may improve the ISO7841's RF immunity.
To confirm we have tried other TI isolators (such as the ISO7741) and they also suffered from the same issue.