I have an application to read an rpm in the range of 0-6000 rpm with a resolution of 10 rpm and linearity of 0.1%. The sensor is a 60 pulses per revolution gear with a reluctance pick up. Thus I basically need a basic frequency meter with a simple add on circuit for 0-10V analog out for 0-6000 rpm.

Just to keep matters simple and cost low, I was looking at the LM331 from National. The specs are very good - I get a 0.01% linearity over a span of 0-10000 Hz. And the circuit is so simple as recommended by National. The analog output is already part of the circuit.

Compared to this if I use a MCU, then the software has to be developed; I have to account for the crystal drift; I have to have a DAC ;

So the question is : Can I simply use the LM331 and close the issue ? Are there any pitfalls to watch out ?

Waiting for the feedback from members.

Thanks

Raghu