[sdiy] Log converters

[Julian Bunn]

TI have a few logarithmic amps I was coincidentally looking at last night. E.g.

http://focus.ti.com/lit/ds/symlink/tl441.pdf

which has four 30dB sections in one package. Unhappily they don't seem
to be available in the free samples programme :-(

Julian



George Hearn wrote:
> This is new to me!  Never seen a monolithic exponential converter before.
> I've always used the tried and tested methods using tempco resistors or
> LM13700 linearizing diodes but let me know how you get on if you use this
> chip, it looks interesting.  Log conformance over only three decades might
> be a poor spec though.  However it's difficult to relate 0.1dB of error over
> this range to how 'out of tune' this might sound for a VCO.. I'd like to
> know (hear) the answer.  Regards, George
> 
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Walker Shurlds
> Sent: 07 January 2010 23:21
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Log converters
> 
> Any of yall ever use any kind of IC for log conversion or exponential
> current source?
> 
> I'm looking at this; not intended for CV application.
> 
> http://www.analog.com/en/fiberoptic/loglimiting-amplifiers/adl5306/products/
> product.html
> 
> (Might actually be antilog... didn't read the datasheet very
> carefully yet.)
> 
> Anyway, if not this one then is there anything else similar?  (Since it
> would have hella better temperature compensation built in.)
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