最近使用AD7981采集传感器电压值,参考电压2.5V。采集传感器数据时有一段不正常,比如0-1V的时读取正常,1V-1.5V的时候读取的值均为1.5V,超过1.5V又能正常读取。后面用的是PIC的单片机,SPI接口为IO模拟,更换过一片AD情况是一样的,请问这个问题最大可能性出在哪?
最近使用AD7981采集传感器电压值,参考电压2.5V。采集传感器数据时有一段不正常,比如0-1V的时读取正常,1V-1.5V的时候读取的值均为1.5V,超过1.5V又能正常读取。后面用的是PIC的单片机,SPI接口为IO模拟,更换过一片AD情况是一样的,请问这个问题最大可能性出在哪?
Hello, i must find the AD7981 lifetime at 195°C for a client. It's urgent, and i hadn't an answer from the customer care. Thanks a lot for consideration!
Hi vlad8016,
What Klaus mentioned are right. There are three most common types of ADC input structure a.) Single- Ended b.) Pseudo Differential c.) True Differential. From your description above I can see that you are looking for ADC that has a pseudo…
Engineers that must design for very high temperature environments -- such as down-hole oil and gas, avionics, heavy industrial, and under-hood automotive -- face quite a challenge when it comes to making high precision circuits that are also reliable…