XR2206

[Lenox (Buck) Buchanan]

At 11:52 AM 9/11/97 +0200, Matthias Wenzel MT wrote:
>
>is there anyone with expierience on the XR2206 (two current controlled 
>oscillators, with AM input).
>I am designing a quite "feedbackable" system with two 2206 modulating 
>each other in various ways.

Hi Matthias and all,

I've used the XR2206 for non-precision oscillator applications.  It's a
nice part as long as you understand that it is not suitable (at least not
easily) for generation of musical scales.  It sounds like it may be good
for your application since you didn't mention anything about tracking or
stability.  It's normally used in inexpensive benchtop function generators.

>SEND ME HINTS, IF YOU HAVE

>From what I remember (*if* I remember correctly - it's been a while, please
don't hang me if I'm off base on some of this stuff) about the 2206, here's
some things that might be worth noting:

1.  It can be voltage controlled but the sweep will not be terribly linear.
 You can get approx 1000:1 out of it.

2.  I believe CV must swing between ground and positive rail.  If the CV
goes negative it stops oscillating.  BTW, the CV in this case is actually
current pulled from the control pin.

3.  Simultanious sine and trangle output is not possible (have to be
switched).  Sine output is about half of the triangle which can be annoying
if you want even levels on both waveforms.

4.  Its sine quality appears better than "the other" function gen. chip
(8038) although I could have been doing something wrong with the 8038.

5.  If your doing "weird" things with it, try applying a square wave to the
FSK pin to make it jump between two different frequencies.

6.  I never played with the AM input so I can't help you there.

You need the data sheet for some of this to make sence.  You also might try
the 8038 if you want simultanious sine and triangle outputs.

Hope this helps some.

Buck