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AD8495 in setpoint controller mode...

Question asked by kwelch on Jul 7, 2011
Latest reply on Jul 8, 2011 by Reemo

I'm using the AD8495 in setpoint controller mode, with the circuit configuration lifted directly from Fig 36 of the Rev C datasheet.  At room temperature I'm getting essentially no output ( about 3 mV) at the pin 6 output.  Heating or cooling the TC makes no change.

 

The setpoint voltage selected by our circuit designer is 250mV, aiming for a temp setpoint of 50˜C.  The TC voltages I'm seeing at the postive and negative input pins are both 46mV, and don't change much from this range.  Is this anywhere near right?  Any ideas as to why I'm getting no output at all from this device?

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