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三、A/D转换电路及其与微处理器接口1.A/D转换电路有关参数1)、绝对精度即对应于一个给定的数字置的实际模拟量输入与理论模拟量输入之差。实际上,对应于同一个数字量,其模拟量输入不是固定值,而是一个范围。对应一个已知数字置的输入模拟量定义为模拟量输入范围的中间值。例如,一个A/D转换电路,理论上5V应对应数字量800H,而实际上4.997V到4.999V都产生数字量800H,绝对误差将是[(4997+
Third, the A / D conversion circuit and its interface with the microprocessor 1. A / D conversion circuit parameters 1), the absolute accuracy that corresponds to a given digital home analog input and the theoretical analog input difference. In fact, corresponding to the same digital quantity, its analog input is not a fixed value, but a range. The input analog value corresponding to a known digital value is defined as the middle value of the analog input range. For example, an A / D conversion circuit, in theory, 5V should correspond to the digital 800H, while in fact 4.997V to 4.999V have a digital 800H, the absolute error will be [(4997 +