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大家好,请问一个问题,ADC的自校准原理是什么?怎么用?

Other Parts Discussed in Thread: ADS1224, ADS1255

大家好,请问一个问题,ADC的自校准原理是什么?怎么用?

很多ADC都有自校准功能,比如ADS1255,ADS1224等等,

自校准也有很多种类:偏移自校准,增益自校准等等,

我想请问一下

1.这个自校准的原理是什么?

2.只要执行一次校准命令就可以了么?那校准寄存器的值读出来有什么用?

手册没能看得很透彻,抱歉,可能这是个很简单的问题,但我一直没弄懂,请大家指点一下。

  • 现在的 ADC 基本都带自校准功能, 上电后只要执行一下校准命令就可以了

  • 感谢您的回复!

    但凡校准都得有标准信号,自校准的标准信号来源于哪里呢?内部的基准源吗?这个基准的温度系数是多少?

    以ADS1255的Self-Calibration为例,使用方法如下:

    Self-calibration corrects internal offset and gain errors.
    During self-calibration, the appropriate calibration signals
    are applied internally to the analog inputs.

    SELFOCAL performs a self offset calibration. The analog
    inputs AIN P and AIN N are disconnected from the signal
    source and connected to AVDD/2.

    这里是用AVDD/2来校准,但是通常AVDD的温度系数可能会很大,这样还能校准吗?