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STHV800 rx amplitude problem

Question asked by Oleksandr Yaremchuk on Nov 6, 2017

Hello Communnity

I use the eval board STEVAL-IME013V1
Input frequency 40kHz
Transmission of a sin 40kHz signal from XDCR8 to LVOUT8 1:1
When the piezoelectric element UTR-1440K is switched on to the XDCR8 connector, the level of the received signal ~ 5mV
When the UTR-1440K piezoelectric element is switched off from the XDCR8 connector, the level of the received 30mV
When the piezoelectric element MA40E8 is switched on to the XDCR8 connector, the level of the received signal ~ 10mV
When the MA40E8 piezoelectric cell is switched off from the XDCR8 connector, the level of the received signal 70 mV
Question: why the large attenuation of the received signal with switched on piezoelement?

Piezoelement switched on directly to smb 
All datasets and oscillograms in the attachment

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