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TMS320F28377 ADC外部参考电路设计问题

TMS320F28377 技术参考指南里要求外部参考电路需要加高精度运放作为缓冲,并在运放跟随后加滤波电容,这样容易造成运放不稳定吧?请问在这里加电压缓冲的目的是什么,手册中电压参考引脚所需输入电流只有190uA,一般的基准芯片输出有10mA左右,滤波电容用来滤波和提供瞬时电流,不加这运放缓冲会带来什么问题吗?谢谢!