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一、总体设计主要技术性能指标如下:分辨率:15位(最高位为符号位),2~(-14);精度:±0.01％(满量程);总转换时间:8μs;温度系数:10ppm/℃;输入电压范围:±8192mV;编码:反码;输出状态:正逻辑。总体原理框图如图1所示。输入模拟子样电压和经解码网络输出的基准电压在比较器进行比较,由比较结果去修正解码网络输出的基准电压值,直到加于比较器两输入端的电压值相等为止。此时,在解码网络输入端的一组码值电压的二进制数字值就是对应于输入模拟电压的值。通过对模拟量的不断比较,实现由模拟量到数字量的转换。本A/D转换器的传递函数式:
First, the overall design of the main technical performance indicators are as follows: Resolution: 15 (the highest for the sign bit), 2 ~ (-14); Accuracy: ± 0.01% (full scale); Total conversion time: 8μs; Temperature Coefficient: 10ppm / ℃; Input voltage range: ± 8192mV; Encoding: Inversion; Output status: Positive logic. The overall block diagram shown in Figure 1. Input analog sub-sample voltage and the decoded network output voltage reference in the comparator to compare the results of the comparison to modify the decoding of the network output of the reference voltage until the voltage applied to both inputs of the comparator equal. At this point, the binary digital value of a set of code voltage at the input of the decoding network corresponds to the value of the input analog voltage. Through the continuous comparison of analog to achieve the conversion from analog to digital. Transfer function of this A / D converter: