AD8363 With Floating TCM1 & TCM2 ?

Hello All,

Using the AD8363 but am getting a logarithmic slope close to 40mV/dB instead of the specificed 52mV/dB.  Could this be caused by leaving the TCM1 and TCM2 inputs floating. Is  recommended to have these pins connected to some potential (table 4 page 18)?  I don't need temperature compensation so I assumed that I could leave these pins floating.  Are there recommended resitor values for a resistor divider to vref?

  • 0
    •  Analog Employees 
    on Jan 3, 2010 7:50 AM

    I think that it is safer to tie TCM1 and TCM2 to known potentials. Both of these pins pull bias currents. So the absence of an external drive source could cause the voltages to move to undesirable voltage levels.

  • 0
    •  Analog Employees 
    on Aug 2, 2018 4:08 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin