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关于28027ADC采样存在误差的问题

Other Parts Discussed in Thread: MSP430G2553

问下我用28027进行AD采样,程序是参考TI的ADC的例程改的,所以设置应该不会存在问题。但是测同一个模拟量,我用28027的12位AD测出的数据的误差要比MSP430G2553的10位的AD还大。都未做过AD校正处理。请问下这是可能是什么原因?我应该怎么做呢?

  • 楼主,

    电源3.3V供电是否稳定?

    是否有做零点偏置的校正?

    是TI的DEMO板还是自己画的板子?

    请尝试用换一个ADC通道试一下,另外你配置的ADCCLK是多少,ADC采样窗口是多大?

     

  • 首先,我用的是TI的Launch PadF28027不是自己画的板子。

    电源是板子上的3.3V电源,有些波动,但是基本在3.28左右。这应该不是问题吧G2553也用的是板子上的电源啊。

    没做过零点偏置校正,TI的文档有段这样描述的The ADC is factory calibrated at
    25-degrees Celsius to correct both of these while allowing the user to modify the offset correction for any
    application environmental effects, such as the ambient temperature.Except under certain emulation
    conditions, or unless a modification from the factory settings is desired, the user is not required to perform
    any specific action. The ADC will be properly calibrated during the device boot process.

    其他通道也有试过,我选的是精度误差最小的通道都没有G2553精度高。G2553也没做校正,理论上12位的AD要比10位的精度高啊!ADCCLK是60MHz,ADC采样窗口7个采样周期。这些设置我都是 参考TI例程设置的,没有变过

    现在我不知道该怎么调试找原因!不知有什么建议呢?

  • 请问楼主,你的问题原因找到了吗?