Hi TI forum, so I'm designing a circuit to take rpm and convert it into a voltage to be read by an Arduino. I have create a circuit using the lm2907 IC but when I use an input frequency of 420 hz the max oltage is only 3.62 V. When I did the calculations for R1 and C1 I used a max frequency of 420 hz and a max Vo of 5 V. I don't fully understand the equations for how to find R1, C1, and C2. My circuit does work because when I change the input frequency the output changes in value but never gets higher than 3.62 V. I will include a few pictures and a schematic to give a visual representation of my design. If you need any other details please ask because I would really like to figure out my problem so I can move forward in my development. Also this might not be super important but I'm a second year computer engineer so I might use incorrect terminology and I apologize for that. Thank you for any input!
I also used another forum post to attempt to fix my problems but it didn't make anything better. Link
Specifications
Vin = 5 v
Vout = 0-5v
My Calculated Values
C1 - 80 nF
R1 - 27,777 ohm (I'm using 28k because its close enough)
C2 - 1 uF (I choose this based on the example circuit given in the data sheet)