FAQ
Good day,
I'm struggling to understand this FDA.
I plan to have a resistor divider which will output 4V at full scale. I'll then feed this output to an AD8421, which will give a gain of 2 and level shift the output down so as to center the signal…
Hi:
For ADA4940-1,Vocm is an Output Pin, output 2.5V?
打算采用ADA4940-1作为精密ADC:AD4001/4003的驱动器,待采集的信号是单端信号,经运放AD8228和AD8250放大之后,采用ADA4940-1转成差分信号。信号采集流程图如下图所示。
问题1:
我在ADA4940-1的datasheet中看到需要计算单端输入阻抗,如图66,67所示。由于我在ADA4940-1同相输入端接了可编程增益仪表放大器AD8250的输出端,请问我还需要考虑在AD8250输出端和ADA4940-1的同相端之间增加端接电阻Rt吗?
问题2:由于AD8250是一个程控增益放大器…
Hi
In ADC and driver simulation tool, there is only one option "INVERT" for ADA4940-1 connecting to AD7982. I don't want my ADC reading reverse. Can I cross connection, which means ADA4940-1 Out+ connecting to AD7982 In-, while ADA4940-1…
If you do not add an operational amplifier in front of the ADA4940-1, the circuit will still behave normally, but the ADA4940-1 circuit will present a lower impedance to whatever is driving it, compared to an opamp buffer which could generally be configured…
Hi,
I want to convert single - ended input to differential ended for driving ADC. I have gone through datasheet of ADA4940-1 in which calculations are given to terminate single ended input. For known source impedance I am using LTC6252 as buffer. But…
那Rg前的电压是±1V还是±1000V,又有什么问题呢?
发帖提问想确认的是:单5V供电ADA4940-1,输出共模2.5V,Rg前的电压是否允许为负?