JAMSC-120DDO35410
JAMSC-120DDO35410
JAMSC-120DDO35410
2．积分型ADC
积分型ADC又称为双斜率或多斜率ADC，它的应用也比较广泛。它由1个带有输入切换开关的模拟积分器、1个比较器和1个计数单元构成，通过两次积分将输入的模拟电压转换成与其平均值成正比的时间间隔。与此同时，在此时间间隔内利用计数器对时钟脉冲进行计数，从而实现A/D转换。
积分型ADC两次积分的时间都是利用同一个时钟发生器和计数器来确定，因此所得到的D表达式与时钟频率无关，其转换精度只取决于参考电压VR。此外，由于输入端采用了积分器，所以对交流噪声的干扰有很强的抑制能力。能够抑制高频噪声和固定的低频干扰（如50Hz或60Hz），适合在嘈杂的工业环境中使用。这类ADC主要应用于低速、精密测量等领域，如数字电压表。
厦门泰尼电气有限公司
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