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Beginners / Re: LC filtering for combined Vref/VDD of ADC
« Last post by temperance on Today at 11:12:20 pm »You can power the ADC from a proper shunt reference with a voltage between 3...3.1 V. The digital part of the ADC can tolerate at its input Vcc +0.6V (absolute maximum rating)
As long as the difference between the SPI interface maximum voltage and the shunt ref. minimum voltage stays within 0.3 V, it will work fine and the SPI interface clamping diodes will not conduct.
An LM4040 is a popular shunt reference available in 3 V, 0.1 %, 100ppm. A REF2030 is 0.05 % and 8ppm.
As long as the difference between the SPI interface maximum voltage and the shunt ref. minimum voltage stays within 0.3 V, it will work fine and the SPI interface clamping diodes will not conduct.
An LM4040 is a popular shunt reference available in 3 V, 0.1 %, 100ppm. A REF2030 is 0.05 % and 8ppm.