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ads1258供电问题?

Other Parts Discussed in Thread: ADS1258, OPA227

具体供电方式如下:

             通过adr441得到+2.5v电压基准。通过2片双路运算放大器(op284)分别得到两路+-2.5v,一路+-2.5v为ads1258的参考电压(vrefp、vrefn),一路+-2.5v为ads1258的供电电压(avss、avdd)。结果发现ads1258工作时(进行convert时)电压跳变很厉害,没法保持精度。请问是不是OP284的驱动能力不够啊?op284最小驱动电流为+-10mA。

             麻烦专家给予解答!如果是驱动不够,能不能推荐一款运算放大器?急!搞了好几天都没搞定。