[sdiy] ca3280e in germany?

[Ian Fritz]

Tony --

Just to add a couple of details, according to the studies reported by Serge 
T in EN #113: at an input current level of 90% of the programming current, 
the 3280 has 0.3% distortion vs. 8% for the 13600 driven at the same signal 
level (and using the standard 500R input resistance scheme).  Distortion is 
due to the inputs not being true current sources.  The 3280's design is 
just plain better for distortion.

   Ian

At 02:24 AM 11/14/2002, Tony Allgood wrote:
> >  Noo...no...no..no...The LM13700 is not the same as the CA3280.  The
>biggest difference is the bias circuitry for the linearinzing diodes...
>
>Jim's totally right here. That linearising network at the front end of
>the 3280 is very special if you want to work that input stage very hard.
>There is no need to take any input voltages down to mV levels as you
>would a 3080. Even with the LM13600's input diodes, you'll still need to
>watch your input levels very carefully. I think the top level is around
>100mV or so for acceptable distortion with these.
>
>Of course, the problem with either linearising network, once you go
>beyond its limits the clipping will be hard and severe.
>
>The 3280 has more in common with R-Ohm's BA6110. Although not
>manufactured in SIL anymore, its a great chip to use, and incorporates
>its own buffer too. The Gm spec is different though. An Iabc of 1mA will
>send the little BA6110 to an early grave. The 3280 is far more rugged
>and can take up to several mA, but accordingly you will have to drive it
>harder to achieve the same 'gain'.
>
>Regards,
>
>Tony Allgood                       Penrith, Cumbria, England
>
>Oakley Sound Systems                   www.oakleysound.co.uk
>Modular projects            www.oakleysound.com/projects.htm