[sdiy] Analog Devices V/F / F/V converters (AD537, AD650, AD652, AD654, AD774

[Josh Forgione]

I've used the AD650 extensively, though not in synth applications.

The voltage to frequency relationship is a linear relationship.  
Nonlinearity can be calculated depending on how you've configured the part 
(see the datasheet).

Since the AD650 is essentially an integrator, comparator, then one shot, the 
output pulse width is constant across all frequencies.  So at the max 
frequency you'd get a 50% duty cycle wave, but as your frequency dercreases 
so does the duty cycle.

The strength of the V/F is you can achieve high linearity when when using it 
as part of an A/D or D/A conversion.  It's a great alternative to A/Ds if 
you have several channels that need to be transmitted over a long distance.

One possible synth application could be the generation of a trigger pulse 
based on a control voltage input.

Josh

>From: Andre Majorel <aym-htnys at teaser.fr>
>To: synth-diy at dropmix.xs4all.nl
>Subject: [sdiy] Analog Devices V/F / F/V converters (AD537, AD650, 
>AD652,AD654, AD7740, ADVFC32)
>Date: Sat, 7 Apr 2007 10:25:55 +0200
>
>Analog Devices make a number of a voltage-to-frequency /
>frequency-to-voltage converters : AD537, AD650, AD652, AD654,
>AD7740 and ADVFC32. Those I've looked at don't seem to have an
>exponential voltage-to-frequency relationship, though.
>
>Are any of those of any use for synth or general audio
>applications ? Especially, are there existing designs based on
>them ?
>
>--
>André Majorel <URL:http://www.teaser.fr/~amajorel/>
>Do not use this account for regular correspondence.
>See the URL above for contact information.
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