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1 概述目前市场上用于与微机接口的 A/D 转换芯片都是逐次比较式的。它的主要特点是工作速率高,且易于与微机接口。然而其价格随着转换精度与速率的提高而急剧上涨。在实际应用中,许多被测物理量,如温度、湿度、压力、位移等本身变化缓慢,因而转换速率不是主要问题,选用低速的积分式 A/D 芯片即可。
1 Overview Currently on the market for the A / D converter with the computer interface chips are successive comparative. Its main feature is the high working speed, and easy to interface with the computer. However, its price has risen sharply with the increase of conversion accuracy and speed. In practice, many measured physical quantities, such as temperature, humidity, pressure, displacement, etc. change slowly, so the conversion rate is not the main problem, the choice of low-speed integrated A / D chip can be.