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DAC out range

Question asked by Fred.MG on Jun 25, 2015
Latest reply on Jul 23, 2015 by LiamR

Hello,

 

Regarding the DAC output range of ADuCM350.

By the device datasheet, it specifies that the output range of DAC is -0.6V ~ +0.6V as seen by sensor.
   

And by the user guide (UG-587), the DAC out range is 0.5V to ~1.7V based on VBIAS 1.1V (1.1V +/- 0.6V).

I think this range is because it is related to interal TIA's VBIAS(1.1V) of ADuCM350.

 

What I want to know is if it is possible to output the DAC range of ‘0V ~0.6V’ based on ground level (0V), not VBIAS 1.1V.

Simply, I want to use the DAC as independent DAC like standard DAC (not related to internal TIA).

The purpose is that I want to use the DAC as the bias source(0.2V~0.5V) of the discrete Op-Amp (positive terminal) for glucose meter application. At this time, the ADC part of ADuCM350 is used to measure the analog signals (output of Op-Amp) via AN_A, AN_B…etc.


And, if the DAC output range of 0~0.6V is possible, what is the configuration(setting) of P and N switch?


Thank you,

MG.

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