ADG1604 - Waveform change when connect input to source terminal

Hi Khanh,

Can you also share the schematic part of the AD8436?

For the scope shots, where is the yellow line connected to?

Regards,

May

Hi May,

This is the schematic of the AD8436 part

>For the scope shots, where is the yellow line connected to?

The yellow line is connected to the S1 terminal of the ADG1604. 

Thank you!

Hi Khanh,

Where is S1 connected to? What is your input signal source?

Can you share a scope shot of the input signal only (not applied to S1 input)?

Have you check if your probes are properly calibrated?

Regards,

May

Hi May,

>Where is S1 connected to? What is your input signal source?

The signal source is the Current Transform sensor, it's "like sine" wave, 50Hz.

And the S1 is connected to the sensor output.

This is the signal of sensor output (do not connect to any thing instead of the scope)

If you need more info, please let me know.

Thank you!

Hi Khanh,

May I know how many boards have you tested and do the boards have same response?

Have you tried to get a scope shot when the ADG1604 D pin is not yet connected to the input of the AD8436? Does it show same response?

With regards to the oscilloscope set-up, have you checked if "averaging waveform" has been enabled? This could be one of the reasons for the sine wave-like D out. 

Regards,

May

Hi,

This conversation has been taken offline.
The cause of the issue has been identified and is because of the error in HW layout, not the ADG1604. 

Regards,

May