To process analog signals digitally, an analog-to-digital converter (AD converter) is required. However, only voltages in steps can be measured by an A/D converter. This is known as quantum voltage. The range to be measured is thus quantized.
In an AD converter, the digital resolution depicts the number of levels there are in the quantization. This determines the accuracy and sensitivity with which a previously analog level value is depicted. The more available levels there are, the more precise the discrete signal received and the higher the sensitivity of the measurement.
为了以数字方式处理模拟信号，需要一个模数转换器（AD转换器）。然而，A/D转换器只能测量步进电压。这就是所谓的量化电压。因此，要测量的范围被量化了。
在AD转换器中，数字分辨率描述了量化中的级别数量。这决定了前部的的模拟电平值被描述的准确性和灵敏度。可用的电平越多，收到的离散信号就越精确，测量的灵敏度就越高。
The resolution indicates how many varying digital values an analog signal can be converted into. The resolution is expressed in bits.
分辨率表示一个模拟信号可以转换为多少个不同的数字值。分辨率以 bit 表示。
8-bit resolution 8-bit 分辨率 |
256 level values 256 个级别值 |
16-bit resolution 16-bit 分辨率 |
65,536 level values 65,536 个级别值 |
24-bit resolution 24-bit 分辨率 |
16,777,216 level values 16,777,216 个级别值 |
Example
举例
A 24-bit resolution, a sensor measurement range of ±10 V and a sensor sensitivity of 100 mV/g result in:
20V / 224 = 1.192 µV → Corresponds to 11.92 µg
24位分辨率，传感器测量范围为±10 V，传感器灵敏度为100 mV/g，结果为：
20V / 224 = 1.192 µV → 相当于 11.92 µg
Fig.: Quantization error at low resolution
图: 低分辨率下的量化误差
Information: 注意: The module has 24-bit resolution. 该模块具有24位的分辨率。 |