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低电压(0~50mv)AD采集

Other Parts Discussed in Thread: MSP430F248

各位大侠:

     这里在进行一个0~200mv直接输入到msp430f248 ad口,进行ad采集时,误差比较大,比如实际测量50mv,采集结果为100mv,

     问下各位大侠,这种低电压的ad采集有什么需要注意的吗?多谢