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| Cap voltage divider |
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| vignesh_shan:
Hi, In one of my project i seen capacitor voltage divider in the 1.2V DC domain. No clear data given in the datasheet. Only application circuit has that cap voltage divider. If anyone know this requirement pls explain. Thanks, VigneshShan |
| Wimberleytech:
What chip is it? |
| SiliconWizard:
Would need to know the context a bit more. For instance, are those VREFx/MVREFx pins outputs or inputs? If you think of them as inputs, this thing would be odd. Whereas the voltage at the middle point of the "divider" will quicly settle to about half of VCC_1P2 (thus ~600mV, obviously modulo the tolerance of both caps), said voltage will drop exponentially if the inputs are drawing any current. So I kind of doubt those are inputs, and thus kind of doubt this is actually a voltage divider, but taking a look at the datasheet of the IC would definitely help. |
| MagicSmoker:
These caps aren't being used as voltage dividers; they provide symmetrical AC bypassing to both Vcc and GND. |
| Wimberleytech:
--- Quote from: MagicSmoker on December 06, 2019, 04:57:04 pm ---These caps aren't being used as voltage dividers; they provide symmetrical AC bypassing to both Vcc and GND. --- End quote --- That was my first impression as well given that these go to vref pins. But, I want to see what is going on inside the chip...thius the request. Bypassing VREF this way does not make sense. Thus, I want to know more. |
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