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AD9680 Temperature Diode

Question asked by adiup on Jan 21, 2015
Latest reply on Jan 21, 2015 by UmeshJ

To Whom it May Concern,

 

The AD9680 data sheet is not clear about the temperature output on the FD_A pin.

Text on p.22 reads that the temp diode voltage can be output to the FD_A pin.
Typically such diode requires a very accurate current source. That implies a high input impedance requirement to ADC converting that voltage.

 

I couldn't find:

* whether an ext current source required (I assume not);

* FD_A parameters are defined in the digital out mode only. No info on whether there is a built in temp voltage buffer and what its output parameters are.

It's important in the case when I want to read temp-related analog voltage AND use digital output from the pin because digital input connected to the pin may have leakage acceptable for a digital circuit but too high for the analog output.

 

Any help on this issue would be greatly appreciated!

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