Hi all,
I have a RC circuit in parallel 330K and 1uF.
This is going to be connected to an A/D input of a PIC. The PIC is a 16LF1936, which says the impedance is 10K source.
1. How do i calculate the impedance of the RC circuit? I think it is Z=squareroot of RxR + Xc x XC.
XC is the reactance of the capacitor. 1/2x3.142xfreqxcapacitor.
2. For capacitive reactance, what should the frequency be? Would it be at DC i.e. 0Hz. If that is the case the RC impedance is only 390K. Is that correct?
3. If the source impedance of the PIC is 10K, then the RC impedance needs to be greater than this or the signal is reduced.
Does all this seem correct?
Thanks in advance.
I have a RC circuit in parallel 330K and 1uF.
This is going to be connected to an A/D input of a PIC. The PIC is a 16LF1936, which says the impedance is 10K source.
1. How do i calculate the impedance of the RC circuit? I think it is Z=squareroot of RxR + Xc x XC.
XC is the reactance of the capacitor. 1/2x3.142xfreqxcapacitor.
2. For capacitive reactance, what should the frequency be? Would it be at DC i.e. 0Hz. If that is the case the RC impedance is only 390K. Is that correct?
3. If the source impedance of the PIC is 10K, then the RC impedance needs to be greater than this or the signal is reduced.
Does all this seem correct?
Thanks in advance.