LM2907/LM2917 - Maximum Frequency supported

Thread Starter

deepika.r

Joined Feb 2, 2016
2
1. I have been trying to find out the maximum frequency LM2907/LM2917 can support. The datasheet does not mention the threshold but has been tested for linearity upto 10khz. Need to know if the IC supports upto 15khz.
2. There is also an application for 'Changing Tachometer Gain Curve'. Any idea on how the slope can be shifted to measure frequency upto 15khz
3. If any Simulation model is available, that would be helpful. the LTspice models already posted in this forum does not run simulation, supporting file missing.

Thanks,
 

Bordodynov

Joined May 20, 2015
2,468
You havean artificial problem.It is ridiculous to think that chip transistors operate up to 10kHz. Reduce capacity.Proportionally reducedoutput voltage.
Datasheet --> Easy to Use; VOUT = fIN × VCC × R1 × C1
 

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Thread Starter

deepika.r

Joined Feb 2, 2016
2
You havean artificial problem.It is ridiculous to think that chip transistors operate up to 10kHz. Reduce capacity.Proportionally reducedoutput voltage.
Datasheet --> Easy to Use; VOUT = fIN × VCC × R1 × C1
Are you saying they cannot work greater than 10KHz?
If they can, what is the the linearity error and the threshold of R1, C1 and C2, so it works satisfactorily? Datasheet says upto 10KHz error is 1% max.
 
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