[sdiy] monolithic VCO chips for FM??

[Czech Martin]

Yes, I´m using it.

It can run faster than the 2206.
And it has pwm / shaper for tri and sine.
In fact this device started the search for 
voltage controled tri-saw shaping on this list,
if I can remember well.
But the frequency will shift a bit in the 083, if
shaping is at its extremes.
>From my head: I think it is the typical 1:10 lab oscillator. Wide
sweeps are not the specialty of the 083

OTOH: the sine wave has much more distortion, the 2206 is a real
good waveshaper principle sine vco, btw. Try to match this performance
with discrete parts. For audio measurement I only use my very
old and crapy looking 2206 oscillator.

And: the frequency range and linearity for the 2206 is speced with
the typical application circuit in mind: i.e. a potentiometer dial
for frequency adjustment, like in a lab oscillator.
If I remeber right this spec is not valid for current drive circuits.
Then the linearity is better. After all, it is an inverting triangle
integrator core, why should it be so very nonlinear?
Perhaps it is the internal switches and mirrors.

m.c.


-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of
synthplayer88 at spymac.com
Sent: 27 August 2004 19:39
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] monolithic VCO chips for FM??




On Sun Aug 22  9:59 , Scott Gravenhorst <music.maker at gte.net> sent:

>James Patchell patchell at cox.net> wrote:
>>This I find very amazing...(i.e. BS)....If you look at the data sheet for 
>>the XR2206, sweep linearity is only 8%....this is no where close to 
>>flat....the ASM-1 oscillator is somewhere around 0.01%....


Hey guys,
Has anyone used the maxim 038 VCO chip? The specs looks good, any thoughts?

http://pdfserv.maxim-ic.com/en/ds/MAX038.pdf


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