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LMP91300一致性问题

用阻抗分析仪测了LC并联电路的RP值,然后用开发板测试91300接近寄存器的值。芯片数据手册里面讲,接近寄存器就是存放RP经数字转换后的值,但实际上与阻抗分析仪测试的结果相差特别大。即使两块PCB用阻抗分析测RP值相同,但是接近寄存器中的值能差两三千欧。该怎么保证91300的一致性,从而进行批量生产呢?