VSSA means that the low potential of the analog power supply is equivalent to the analog ground, which simulates negative voltage during chip operation.
VSSA (Analog Ground): This is the reference voltage level for analog circuits within an IC. It's often connected to the ground terminal of the analog components on a chip. Separating the analog ground from the digital ground helps reduce noise and interference, which is crucial for maintaining the accuracy and performance of analog circuits, such as analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and other analog signal processing components.
Negative Voltage Simulation: In some cases, VSSA may be designed to simulate negative voltage levels for certain analog circuits even though it's actually at or near ground potential. This can be achieved by biasing the analog components or using level-shifting techniques to create a virtual negative voltage reference within the analog domain.
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