dnyandeep.buwa@bhge.com

ADG884 switching issue at 80-85 Deg. C operating temperature.

Discussion created by dnyandeep.buwa@bhge.com on Apr 3, 2018
Latest reply on Apr 9, 2018 by mayp

ADG884 switching issue at 80-85 Deg. C operating temperature.

 

We are using ADG884 in data acquisition system. 

ADG884 is multiplexing two difference voltage followed by instrumentation amplifier and Delta sigma ADC. The 1st voltage is 25~50mV and 2nd voltage is 0.1~2mV. We are measuring 1st voltage every 120ms and 2nd voltage every 1.2 second. 

 

The system works fine at room temperature and we didn't observe any data violation during 48~72 hours repeatability test. 

 

We observe drift of 1~2mv drift in 1st reading and 2nd reading measurement at 80-85 deg. C of operating temperature. 

 

We study the characteristics of switch and its on state resistance will not cause problem to us, since it connected to buffer input of instrumentation amplifier. 

 

Can someone please help us to understand which parameter of switch is causing this issue?

 

Thanks and best regards,

Dnyandeep

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