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单片机系统中如何保证AD转换的精度

消耗积分:0 | 格式:pdf | 大小:241 KB | 2011-12-06

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This application note describes how to optimize the ADC hardware environment in order not to alter the intrinsicADC resolution and to provide the best overall performance. Indeed, the resolution depends on both the ADCintrinsic noise and noise transmitted by an external environment such as package impedances, power-supplynetworks, de coupling networks, loops and antennas. Some electromagnetic mechanisms have to be known in orderto improve immunity against radiated and conducted emissions. The environmentnoiselevel of a digital productis typically equal to +/-50mV. The resolution of 10-bit ADC is 4.88mV for a 5v voltage reference. Without anyprecaution up to four bits can be lost, thus degrading the ADC from 10-bits to 6-bits.
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