[sdiy] (Low) frequency to voltage conversion

Tim Ressel timr at circuitabbey.com
Wed Mar 26 20:01:19 CET 2014

The ADVFC32 datasheet sez it will go to 0 Hz. The LM2907 does not, but looking at how it operates I suspect it will work. You'll have to watch capacitor leakage...

Tim Ressel
Circuit Abbey
timr at circuitabbey.com

From: Justin Owen <juzowen at gmail.com>
To: SDIY List <synth-diy at dropmix.xs4all.nl> 
Sent: Wednesday, March 26, 2014 11:44 AM
Subject: [sdiy] (Low) frequency to voltage conversion

Has anyone got any experience with using off the shelf F/V chips like LM2907/LM2917/AD650/ADVFC32 with frequencies between approx. 1Hz and 0.001Hz?

A quick review of a few data sheets today seems to show that they focus on the upper range of capability rather than the lower range. The AD650 mentions it's linearity at 10KHz.

I'm looking at options other then a uM or from scratch 'Tacho' circuits for F/V conversion in the sub 1Hz range.

P.S. I'm currently only after measuring 50/50 square waves...


- J

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