Hello.
Do you have any part number whose sigma delta ADC it can be inputted signals from 0V～2.5V in MSP430 MCUs?
There seems to be only MSP430 MCUs whose sigma delta ADC can be inputted signals up to 1.5V.
Regards,
U-SK
Hello,
It depends if you are referring to common-mode input voltage or differential input voltage.
By referring to the table above from the MSP430I2041 datasheet, the SD ADC can input an absolute voltage range between AVss-1 and Vcc. The same range applies for the common-mode input voltage range.
In terms of differential voltage range, you are correct. The maximum differential voltage that can be applied is based upon the Vref of the SD ADC which maxes out at 1.5V if using an external voltage reference (depicted in Table 5-20 of the same datasheet). For example, with a GAIN of 1, the full-scale differential input voltage range would be -Vref to +Vref.
With that being said, we recommend that the differential input voltage stay with 80% of the max and minimum allowable values. So following the recommendation, the differential input voltage should not be below -Vref*0.80 or above +Vref*0.80.
Hopefully this helps clear things up.
Best regards,
Matt
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