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电子产品世界 » 论坛首页 » 综合技术 » 基础知识 » 【我踩过的那些坑】分享一下调试一款AD芯片的遇到的“坑”

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【我踩过的那些坑】分享一下调试一款AD芯片的遇到的“坑”

keyboard007
高工
2025-08-15 16:41:16   被打赏 50 分(兑奖)     打赏

    在工作之中，经常遇到采集0-5V，4-20MA，差分输入的信号。使用过ADS8341，ADS1256，CS5530这些16位或者24位的芯片。今天先和大家分享ADS1256的使用心得。

    ADS1256是一种高精度的24位ADC芯片，当时选用的时候，是因为可以同时支持8路单端输入，或者是4路差分输入。不过在硬件PCB设计和软件处理方面还是需要多注意的。

一：硬件设计：

   1.1： 首先AD芯片的供电电压和基准电压的设计。

  1.2：  基准的选择：需要选用2.5V基准芯片。常见的是AD780，TL431，LM358，ADR431。当然为了保证性能的稳定，需要采用噪声低，温漂小的AD芯片，还有综合考虑下芯片的设计成本。同时在靠近芯片的地方，并联低ESR的电容。

   1.3.： 还有就是模拟电压的设计：这里可以使用基本电压倍压生成，这样当基准电压变化时候，模拟电压可以等幅度变化，这样可以满足采样数据的稳定，同时也需要注意靠近模拟电压地方并联ESR电容。

　数字电源设计的时候，会比较容易一些，可以根据MCU的电源电压设计就可以了。

二：软件设计说明：

    2.1 芯片使用的是SPI通讯方式，这里可以参考我之前避坑帖子，注意下时钟频率和相位就可以了。

    2.2 每次程序运行的时候，必须给芯片复位，从而唤醒芯片工作。为了使芯片稳定运行，适当的延时一段时间。

    2.3 芯片可以通过软件设置内部的增益（需要和硬件设计相对应），否则采集的到数据会出现问题。

    2.4 切换通道时候，为了防止通道之间的串扰，最好是延时几个us在进行读数（实际测试的）。

 三：使用问题：

3.1 初始化完成后，需要等待芯片的准备好的信号，在进行操作，要不然ADS1256工作不正常。

3.2 读取通过通道数据时候，要注意通道之间的串扰问题，为了避免这一点，在确定不使用某个通道的时候，最好是进入AGND。

3.3 模拟地和数字地需要单点连接，防止环路引噪声干扰。

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jobs
院士
2025-08-18 10:11:39     打赏
2楼

24位ADC~~

对于模电小白的我来说，简单就是天书啊


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xqh518
院士
2025-08-21 17:25:10     打赏
3楼

谢谢分享。


评论
dtbvxlq383
菜鸟
2025-10-20 01:42:30     打赏
4楼

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