电路功能与优势
图1所示电路是一种完全自足的距离传感器，利用一个超
声发射器、灵敏的模拟接收器配合一个精密模拟微控制器
实现距离测量。与基于PLL的复杂接收器不同，图1所示传
感器采用一种灵敏的窗口比较器电路，由此最大限度降低
占用空间和成本。
其有效范围大致为50厘米至10米，分辨率为2厘米左右。
温度补偿由微控制器中集成的温度传感器和ADC提供。
连接/参考器件
电路笔记
CN-0343
Circuits from the Lab® reference designs are
engineered and tested for quick and easy system
integration to help solve today’s analog, mixed-
signal, and RF design challenges. For more
information and/or support, visit
www.analog.com/CN0343.
ADuC7126
32 kB RAM、126 kB闪存ARM7TDMI处理器，
提供灵活的外设选项
ADP3629 高速、双通道、2 A MOSFET驱动器
ADCMP670
双通道低功耗1.5%比较器，内置400 mV
基准电压源
ADP1613
650 kHz/1.3 MHz升压PWM DC-DC开关转换器
AD8692
低成本、低噪声、双通道CMOS轨到轨
输出运算放大器
AD8541 通用型CMOS轨到轨放大器
ADP7104 20 V、500 mA、低噪声、CMOS LDO
ADM3483
3.3 V、限摆率、半双工RS-485/RS-422收发器
超声测距
Rev. 0
Circuits from the Lab® reference designs from Analog Devices have been designed and built by Analog
Devices engineers. Standard engineering practices have been employed in the design and
construction of each circuit, and their function and performance have been tested and veried in a lab
environment at room temperature. However, you are solely responsible for testing the circuit and
determining its suitability and applicability for your use and
application. Accordingly, in no event shall
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to any cause whatsoever connected to the use of any Circuits from the Lab circuits. (Continued on last page)
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评估和设计支持
电路评估板
CN-0343电路评估板(EVAL-CN0343-EB1Z)
设计和集成文件
原理图、源代码、布局文件、物料清单
在工业应用中，距离测量是一种常见的要求，比如，检测
液位或固体间距离。在污水净化、化学处理等应用中，工
业液体往往具有腐蚀性，或者含有固体或残渣。因此，超
声技术具有明显的优势，因为传感器无需直接接触液体或
物体，这不同于浮式传感器。
对于粘稠液体或泡沫水的液位检测，超声液位传感器优于
电容式、舌簧式或浮式传感器。在粉尘或腐蚀严重的环境
中,超声传感器是理想选择。
