THS7001: Specification require of 18 db gain

Hi Durga,

what have you done with the SD pin?

durga_ths7001.TSC

Kai

Do you mean SHDN pin? I have left it. I didn't use it .

Hi Durga,

you might want to add an isolation resistor directly at the PGA OUT. Too high capacitive loads can erode the phase margin and result in oscillation. Try 50...100R.

Kai

Thank you. I will measure it again.

Hello Durga,

  Unfortunately, this isn't very apparent in the datasheet, but you have to apply power to the preamplifier as well, even if you are not using the preamplifier. More details can be found on this thread. Note: PGA minimum supply voltage must be less than or equal to preamp supply voltage.

  Also, would it be possible to add a 3.3kOhm to ground for shutdown pin?

Thank you,

Sima

Oh, thank you so much. it would be very helpful I will try it.

No problem! Hopefully the above fixes the issue. Let us know if it does or does not. 

yes, i will update