I'm looking for a frequency to voltage converter IC that can operate with an input frequency of around 500 kHz. The device does not have to be high-precision and the operating voltage can be anything. I would be looking for a target price of less than $3.00 each in quantities of 100. I haven't been able to find anything. Thank you.
closed as too localized by Kevin Vermeer May 31 '12 at 15:58
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Use a CD4046 PLL at 1:1 frequency ratio. The VCO is reasonably linear (1%), so its control voltage will be proportional to the input frequency.
Looks like CD4046 sells for $0.15 - $0.20 in quantity: http://octopart.com/partsearch#search/requestData&q=cd4046
Digikey sells them for $0.354 ea in 100 quantity (DIP, other packages cheaper): http://www.digikey.com/product-detail/en/CD4046BE/296-2052-5-ND/
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