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CD74HC4046A: need help with reading PC2out with adc

Part Number: CD74HC4046A

hi all,

i am detecting phase shift between two signals feeding to COMMON IN and SIG in . i had issue where PC2out was dead . I solved issue by adding 2k /2k to 5v and gnd . i dont understand why it needs resistors their .

another question is now i can see signal in oscilloscope based on lead and lag . how can i read using microcontroller . do i need to add any filter between ic and microcontroller .  

  • Hi Ashwinder, 

    PC2OUT shouldn't need any external biasing, but since it seems like everything is working correctly I think it should be ok to leave the resistors how they are.

    It depends on your application, but you could add a low-pass filter to measure the average lead/lag between the signals. If you're just interested in measuring the instantaneous phase difference, you could just connect PC2out to the input of the microcontroller and measure it directly. Do you have any requirements for what kind of precision you need to measure the phase difference, sampling rate, etc. ?