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DAC0808LCM输出的电流,电压有变化

DAC0808LCM该型号生产使用了10K,有8只不良,正常进行功能测试时,未见异常,但使用万用表对测试点进行量测(参数测试),发现输出的电流,电压有变化,更换芯片后再测试,问题消除,分析这8只芯片的逻辑门可能存在问题;麻烦帮忙看一下是什么原因,谢谢!

PS:检查焊接时的回流温度,峰值温度为247℃,焊接时间为68.5s,满足无铅制程要求,功能测试是可以通过的,可以排除工艺制程问题导致器件损坏;