SSM2164 VCO

[Roman Sowa]

Hi all

some answers

> The most important question is what
> about temperature compensation.

this thing is sensitive, that's true. when i connected two vcas
in series, it became a nice thermo-sensor.
change was noticable (dual vco: ssm and digital at the same f)
when gently blowing toward the chip!
as i mentioned earlier, heatting the chip up to about 50 deg. C
would cause 2-3 semitones change in frequency

> Is the internal expo function
> just one single be voltage (bad), part of a transistor pair
> (better), or even fully compensated like a CEM3340?

i admit, was too excited when i got the chips to check
datasheet for details other than pinout.
will check it out

> What does it need in terms of external components to get 
> at least the thermal stability we're used to from differential
> pair + tempco resistor ?

i finished and tested all parts of the design. now i'll make it
on preliminary pcb and get ready to fight with tempco.

Roman