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
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发表于 2011-6-30 11:56
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