LM3S系列基本上是10位ADC,与别的厂家的12位的ADC差点那?优越在什么地方?看了个帖子说LM3S虽然ADC是10位的,但是精度非常高。专家给介绍下!
12位的牺牲两位分辨率=10位,精度难道比10位的差?
估计在转换速率上比12位的有优势。
顶~感觉应该是速度吧,10位精度肯定不如12位的,精度就是用位数定义的嘛
或者说指的是稳定?
还是感觉速度有优势靠谱点....
回复 楼主 fxw451 的帖子
楼主如果仔细对比不同家MCU的ADC spec就会发现,INL,DNL, offset都不好。
所以,MCU自带的ADC特性,不要有过高期待,特别是要应用到高精度测量和传感的场合。
Stellaris ADC特点如下:
■ Single-ended and differential-input configurations
■ On-chip internal temperature sensor
■ Maximum sample rate of one million samples/second
■ Optional phase shift in sample time programmable from 22.5o to 337.5o
■ Four programmable sample conversion sequencers from one to eight entries long, with
corresponding conversion result FIFOs
■ Flexible trigger control
– Controller (software)
– Timers
– Analog Comparators
– PWM
– GPIO
■ Hardware averaging of up to 64 samples for improved accuracy
■ Digital comparison unit providing eight digital comparators
■ Converter uses an internal 3-V reference or an external reference