[sdiy] Log converters

[George Hearn]

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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