# reference voltage of sigma-Delta ADC in H1D

Dear,

Is the SBIAS used for a reference voltage of SDADC?

If I set the value as 0.9V in single-ended mode, can I just calculate as follows for transferring the ADC value to voltage?

1unit = 0.9 / 0xFFFFFF; //SBIAS(0.9V) / 24bit(0xFFFFFF) = 0.05364418349529406uV

1unit = 1.8 / 0xFFFFFF; //SBIAS(1.8V) / 24bit(0xFFFFFF) = 0.1072883669905881uV

or

Do I have to use the max input voltage? Thanks,

## Top Replies

• Hi Captain,

Is the SBIAS used for a reference voltage of SDADC?

As mentioned in chapter 15.5.3 of the hardware user's manual, "SBIAS is involved in generating reference voltages used in the…

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• Hi Captain,

Is the SBIAS used for a reference voltage of SDADC?

As mentioned in chapter 15.5.3 of the hardware user's manual, "SBIAS is involved in generating reference voltages used in the ΔΣ A/D converter", so yes. If I set the value as 0.9V in single-ended mode, can I just calculate as follows for transferring the ADC value to voltage?

1unit = 0.9 / 0xFFFFFF; //SBIAS(0.9V) / 24bit(0xFFFFFF) = 0.05364418349529406uV

1unit = 1.8 / 0xFFFFFF; //SBIAS(1.8V) / 24bit(0xFFFFFF) = 0.1072883669905881uV

I'm not really sure as I have not tried it as I don't have an H1D device. But why not just follow the formula mentioned in the user's manual? JB