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RX21A R5F521A6BDFP 24Bit ∆Σ A/D Conversion BGR

RX21A 24Bit ∆Σ A/D Conversion:

BGR_BO pin applied voltage 1220mV (Typ.),

EXREF = 1 ( 0: Generates reference voltage from on-chip BGR circuit. 1: Generates reference voltage from voltage applied to BGR_BO pin. )

When the internal voltage is used, the sampling value is unstable. What may be the reason?

When using an external reference voltage,Are there some special requirements for this external reference voltage range, and is there a corresponding similar schematic diagram for reference?

Thank you!

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