Hi Charles,
Thanks for your patient reply!
For Q2: Is the package of LM96551 compatiable with LM96550 so that I can replace it right now.
For Q3: I notice such description in page 8 of LM96550 data sheet.
In my opinion, this means LM96550 is supported to work in CW mode with the VPP = - VNN from 50V down to 3.3V. But the lower voltage is, the lower power consumption is. And LM96530 is also declared to accept pulses and continuous-wave signals within +/- 60V in data sheet, showed as follow.
So when LM96550 outputs continuous-wave ranged from -50V to 50V, to LM96530, which is capable to accept it, but resulting to cause fatal damage. That's why I confuse for a long time.
To avoid this destructive situation happening again, what is the proposed operation for LM96530 in CW mode or in pulse mode?
For Q5: Figure 1 shows the rest of the circuit after the LM96530. Let ECHO0 denote the output of LM96530. When there is no 'C1' and 'C1069' , the signal at left pad of C1069 turns out to be Figure 4 in previous post. When we put on 'C1' in the circuit , the signal at left pad of C1069 turns out to be Figure 5 in previous post.
Figure 1.
Lately experiment shows as Figure 2, the blue line is high voltage pulse from LM96550, the yellow line is rather small signal comes out from LM96530. So we can see the unexpected oscillate may come from the LM96550, which is rather so small (compared to high voltage pulse i.e. -50V) that we cannot even notice it in large amplitude scale. But the output LM96550 is directly connected to LM96530. How does it cause such strongly oscillate? And what should we do to eliminate it?
Figure 2.
For Q6: What’s the maximum analog input signal for AFE5805?
Q7: There is no input signal to AFE5805 IN1~8 pin. But we do measure almost 2V DC signal at the input pad. Is this normal?