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ADS1251问题

Other Parts Discussed in Thread: ADS1251

ALL,

现在测试ADS1251,测量只有13BIT ,和标称的24BIT差距太大了。。。不确定是IC本身的问题还是我电路的问题,还是其他原因造成 ?已经查了3,4天,也没查到原因。附上原理图

 clk_1174: 3.072MHz

 dc_sclk: 500kHz

当前测试环境:AD前端R54  R58断开,C29连接到地,AD的1脚输入直流电压,参考电压及输入电压波动在10uv内,实际ad的6V量程跳动0.3mv。

ADS1251供电的模拟电源和数字电源纹波都很小,在10mV以内。

        

Adc_Dc.pdf