Hello
Our customer will use AD7745 as as attachment.
They would like to measure Cx-Cy at one case and Cy only at other case.
Can they connect Cin1- and Cin2 + ?
( Is there any inteference between Cin1- channel and Cin2+ channel ?)
Please let me know…
Dear All,
Currently, I am working on level sensing project by using AD7745. The liquid capacitive range is 3~300pF. However, AD7745 has a range of 0-4pF. Do you have any idea? how could i extend the range of AD7745 to be 3-300pF?
Thanks,
Hossam
Hi,
We are currently working on a measurement system with a capacitive sensor and an RTD. For the measurement of the capacitance, I am using AD7745 CDC .
How could we implement an RTD measurement system using the AD7745/46 CDC's ? Is there an reference…
Hi Kumar,
Your equation for Cin looks inline with that used in the evaluation software, it should be ok. Cref is the internal reference capacitance. I have attached an application note that has some detail on this parameter (page 2) which should be true…
Hello Baala,
The AD7745 is only designed to measure a maximum of 17pF (CAPDAC) ±4.096 pF (Input Range); it does not seem suitable for your sensor, even without the cable.
The AD7745 only measures the capacitance between the EXC and CIN pins, and you…
I have to measure the capacitance of three capacitive sensors which are placed together. AD7745 seems ideal for the application. But if I use 3 different excitation sources(one in each chip of AD7745),even if there is a small difference in the frequencies…
测量范围为：11.5pF~23.5pF，已经超出AD7746的正常测量范围。通过降低7746的激励电压，可以提高待测电容的容值范围，见附件的方法，但注意这样做的损失是转换结果的精度会下降，如果容值范围变为+-100pF，则精度会损失6~7个Bit。
Hey Guys,
i am working on development of a pressure sensor with a matrix-like arrangement of the electrodes.
So i have columns and rows and would like to measure the floating capacities.
The area consists of 25 measuring points and now i consider to…
I have a couple of questions regarding AD7745's resolution:
- can I sense a 5aF capacitance variation in a 1pF nominal capacitance with the 21 ENOB and still have the entire dynamic range (e.g. 350fF) available, assuming a 10Hz BW;
- Is it possible…