AD4684 doesn't work

Question

Hi everyone, 
 
 I am working on a new project and need to read high-speed analog signals. I am trying to program AD4684 using Raspberry Pi Pico w with the micropython language, but I haven't done it yet. I sent the configuration1 register before data reading, and I checked it with a logic analyzer, but I couldn't read the correct data. Also, I set the internal reference. However, I can't read 2.5V from the REFCAP or REFIO pin. 
 Firstly, I sent hard reset data. 
 Secondly, I sent configuration1 data (set internal reference) 
 Thirdly, I sent configuration2 data (set 1-wire communication) 
 Finally, I tried to read ADC values. (I read wrong values and I could read only wrong ADC_A value. ADC_B value come zero.) 
 
 Best regards, 
 Omer.

omeryildirim · Accepted Answer

Hi Nathan, 
 I solved the problem. I forgot to connect the exposed pad to the ground. I connected it, and the problem was solved. I could measure the 2.5V. Moreover, I couldn't run it at first. Then, I changed the polarity (as 1) and phase (as 0) in SPI communication. In this way, I could run it. But I couldn't find the information about this matter in the datasheet. I could find it by trying. 
 Thank you for your answer. 
 Best regards, 
 Omer.)

Partner Forums

Partner Libraries

Products Mentioned

AD4684 doesn't work