Hello everyone,
Im trying to simulate the Frequency to Voltage Converter which is presented in the Datasheet of the LM331 from National Semiconductor. Here is a Link to the Datasheet. The circuit Im trying to simulate is on page 10 (Figure 7). Im trying to simulate this circuit in LTSpice.
I´ve attached the Circuit and the MakroModel of the LM331. However my Output does not show any frequency dependencie. Why? I just cannot figure out my mistake. Maybe one of you guys could have a quick look. I allready ajusted A1,A2,and A3 within the LM331 Model and set Vhigh to Vs. Which in my case is 5V. But that doesn´t seem to be the failure. I also set "Skip Initial operating point solution" but it did not help either.
Any Idea is highly apreciated, thanks in advance.
Best regards from Berlin,
Jan
Im trying to simulate the Frequency to Voltage Converter which is presented in the Datasheet of the LM331 from National Semiconductor. Here is a Link to the Datasheet. The circuit Im trying to simulate is on page 10 (Figure 7). Im trying to simulate this circuit in LTSpice.
I´ve attached the Circuit and the MakroModel of the LM331. However my Output does not show any frequency dependencie. Why? I just cannot figure out my mistake. Maybe one of you guys could have a quick look. I allready ajusted A1,A2,and A3 within the LM331 Model and set Vhigh to Vs. Which in my case is 5V. But that doesn´t seem to be the failure. I also set "Skip Initial operating point solution" but it did not help either.
Any Idea is highly apreciated, thanks in advance.
Best regards from Berlin,
Jan