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Measuring Voltage on Test Sample (ADuCM350)

Question asked by gimbal on May 15, 2018
Latest reply on Jun 13, 2018 by mark.ramos

We're seeing some issues with our test sample breaking down as though it was seeing higher than expected voltage being applied. Currently I have the amplifier disabled and VPEAK set to 12mV so we should not be seeing high voltage. However, when I try to probe the signals I'm seeing things that don't make sense to me. First off I see no difference when I enable/disable the attenuation. Second, I'm seeing 1.2V on channel 8. I'm not sure why this is but our test samples must not experience more than 50mV or they start to become damaged. Can anyone explain why I'm seeing 1.2V excitation voltage and how to fix this?

 

My switching sequence is as follows (see attached also):

 

Step #T_MUXN_MUXP_MUXD_MUX
11188
22288
33388
44488
55588
66688
77788

 

Here's my circuit:

 

 

And here's a capture of what I'm seeing

 

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