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。
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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?