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ADS1216使用内部稳压源作为基准源,IDAC输出电流时基准源电压降低了

Other Parts Discussed in Thread: ADS1216

ADS1216使用内部2.5V基准源,IDAC1、2输出0.3mA的电流,接500欧的负载,内部基准源的电压居然降低了0.1V左右,不接负载的时候内部基准源也不稳定,用万用表测数值总是在跳动,有时候慢慢变大,有时候慢慢减少,怎么会这样???而且输出电流功能跟BUFFER使能有关系吗?怎么好像BUFFER不使能的话没有电流输出啊?