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Hi Team
There is a resistor R2 between V33A and V33D in DS recommendation.
I noticed it mentions that digital circuit will draw more current and generate more noise, and compared digital circuit, that analog circuit is more sensitive than digital. so if this resistor can de-couple the noise generated by digital circuit to analog circuit? Can you explain how this circuit impact the performance of UCD3138?
Hello Harry,
Please see page 10 in the UCD3138 Practical Design Guideline (https://www.ti.com/lit/an/slua779b/slua779b.pdf). The 3.3V for V33D, V33DIO and V33A typically all receive power from a single LDO or 3.3V source. The R2 resistor decouples the noise between the analog components and the digital components.
Regards,
Jonathan Wong
