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楼主遇到了一个奇怪的现象,百思不得其解,跪求前辈们指点一下。
我在用一款ADI的芯片AD7683,单通道16位AD转换芯片。 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***a3DU97Gm0/ih8BNnXz8LhsM+yx+d8pK6fGf2TxXOwpWysc7d+FjnLYGuiK9JgQggyGgij1x6ZhAl74ZjQC2RjVR7tH25O1Q+3AusJY3R9O6fwojxdaI18ds6qhoweVWQedv3srmnkVND5UaF25NQmsNs3Nx+4H6480d5nm/tlPqa3b1N5hp6j9oRsd8HEEKPpYZ8GE2Q0CEYni9l0kR729LANp4YYnY+lYhgHa/anl5URHjmPT7vG7c/RXj5x7IisI2dFA8poCGUgG51zz2TxFu2LCS+3CqOz7Pe3aQnEYmpMk8WSOM+sEOGuS87JYllCf8OolRJePxPnjc9T8srGdLGTzjT96/vGM8czuwIZDYXRh204JbNgm23uZ8rnW70PkGSxFKM9H//7XTCp1yWybNe4naW6S9jgz4+Utsh6c***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***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" lazyloadthumb="1" border="0" alt=""> 电路图时这样的,AD7683进行温度的测量,VDD供电由5V的LDO提供,参考电压5.00V由一片ADR02参考电压源提供。IN-接地,IN+分别接测量电压。被测量电压理论上的范围是0到5V. 测量的结果大小是没有问题的,可以读出大致准确的电压值。输出的数据精度是有问题的,表现出数据的位宽随被测电压的大小而自动变化。 在0.455V左右,AD读出的数字在5957,5956,5955,5954左右之间浮动,可以达到1LSB的最小差值,16位数字是有意义的;在1.667V左右,AD读出的数字在21807,21839二者之间跳动,而且总是这2个数,从来没有采集到别的数字,而这2个数字的差是32==2^5;在2.5 V左右,AD读出的数字在32719,32655,32783三个数之间跳动,而且总是这3个数,从没有采集到别的数字,而他们之间的差是64==2^6; 表现出来的行为好像是AD芯片随着被测电压的升高而逐渐降低分辨率。 请问大家有没有遇到过类似的问题? |
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27个回答
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很可能读取数据、管理数据方面有问题。
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借楼问下怎么上传图片啊?
AD7683接口驱动代码如下, [C] 纯文本查看 复制代码 u16 ADC_ReadWord(u8 ch){u8 clk_cnt,bit_cnt;u16 dout_word=0;ADC_SpiRstAll();ADC_CS(ch,CS_L); //拉低对应的片选线,开始一次转换ADC_SpiDly(ADC_SPI_DLY);for(clk_cnt=0;clk_cnt<5;clk_cnt++){ADC_CLK_H;ADC_SpiDly(ADC_SPI_DLY);ADC_CLK_L;ADC_SpiDly(ADC_SPI_DLY);}for(bit_cnt=0;bit_cnt<16;bit_cnt++) //读取16bit的转换值{u8 lvl = 0;ADC_CLK_H;ADC_SpiDly(ADC_SPI_DLY);ADC_CLK_L;ADC_SpiDly(ADC_SPI_DLY); //DOUT电平在下降沿读取dout_word = dout_word << 1; //MSB在前lvl = ADC_ReadBit(ch);if(1 == lvl){dout_word |= 0x0001;}else if(0 == lvl){dout_word &= 0xFFFE;}}ADC_SpiDly(ADC_SPI_DLY);ADC_CS(ch,CS_H); //拉对应高片选线,停止本次转换return(dout_word);} |
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先谢谢你啦。
ADI论坛里那个问题其实就是我问的。 我开始是直接给ADI的客服支持打电话的,推脱了几天也没消息了,后来又去论坛发帖,也没人回。这才来万能的Openedv看看有没有人能指点下 |
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时序和数据管理方面不能说绝对严谨,但是在低电压下也是一直能得到正确的结果,程序并没有修改,但是被测电压升高后明显不行了
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先谢谢您的回复,我在看看是不是有配置不对的地方
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原来真有这样的隐藏属性,是设计成这样的,那就没办法了,也不知道是不是为了低功耗的方案, 看来只能换芯片了
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到底什么问题?
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ADI的一款芯片AD7683随着输入电压的升高,输出的数据位宽会降低。比如,被测电压是0.5v,输出16位数据;当被测电压是2.5v,输出12位数据;当被测电压是5v,输出10位数据。和技术支持沟通过了,他们也没什么办法。我本人怀疑是一种过度设计的功能
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手册上确实没有说这个问题,所以我才去问的技术支持,然后按他们说的重新搭了一个测试电路,结果什么用都没有,电平的延时我已经从2ns一下测试到10ms以上了,仍然不好使。也说不定是买到假货了,已经考虑换芯片了
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问题已经解决了,用ADS8320代替了这个芯片,TI产的,和AD7683pin对pin的,也是16位100ksps的,接口时序也都一样,今天刚到的,换上去测试了一下,问题都没了当时就选的2款一致的芯片,不过没买TI的,总觉得ADI的品质会更好,唉
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那么芯片的疑点就上升。
我曾经用过一种LT的AD,自带2.048v参考电压, 在淘宝上买几片,实际输出的电压值为2.40v, 从正规代-理商拿货就没有任何问题。 后来打听,有人说是官方实验、试产阶段的货品,非法留出了。这情况比较靠谱。 不是芯片设计问题,是市场问题。 |
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原来还有这样的事。总之多谢您的指点
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我是碰到8320的问题,去年打样就发现,在8320输入电压0.6左右以下,示波器点在输入脚,发现,8320会有电压倒出来
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后来问以前同事,说这个IC就是这样的,他们也找FAE了,也没解释明白。其实这个应该是AD采样都有的,只是其他小一点,ADS1115就很小。
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但是现在量产了,发现一个大问题,我的是1拖16个这个IC,SPI并联,并到8个左右以上,采样电压0.3以下,就少了70MV了,电压高了没事,并的少了也没事。不知道群里大师能搞懂怎么回事不?
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你的基准电压改变了,读出的AD就肯定会变化
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