"davew" <david.wooff@gmail.com> wrote in message news:aff45f3b-ff96-4d35-b3e0-d53ed85225dc@d25g2000yqh.googlegroups.com...> I'm searching for a simple one chip solution if anyone has any ideas. > Best I've found so far might be the old 8038 function generator chip.XR2206
Low frequency analog VCO with sinewave output?
Started by ●August 24, 2011
Reply by ●August 24, 20112011-08-24
Reply by ●August 24, 20112011-08-24
On Wed, 24 Aug 2011 09:34:52 -0500, "bw" <bwegher@hotmail.com> wrote:> >"davew" <david.wooff@gmail.com> wrote in message >news:aff45f3b-ff96-4d35-b3e0-d53ed85225dc@d25g2000yqh.googlegroups.com... >> I'm searching for a simple one chip solution if anyone has any ideas. >> Best I've found so far might be the old 8038 function generator chip. > >XR2206--- No sine wave out. -- JF
Reply by ●August 24, 20112011-08-24
On 8/24/2011 9:07 AM, John Fields wrote:> On Wed, 24 Aug 2011 09:34:52 -0500, "bw"<bwegher@hotmail.com> wrote: > >> >> "davew"<david.wooff@gmail.com> wrote in message >> news:aff45f3b-ff96-4d35-b3e0-d53ed85225dc@d25g2000yqh.googlegroups.com... >>> I'm searching for a simple one chip solution if anyone has any ideas. >>> Best I've found so far might be the old 8038 function generator chip. >> >> XR2206 > > --- > No sine wave out. >Duh, check the data sheet......
Reply by ●August 24, 20112011-08-24
On Aug 24, 4:07=A0pm, John Fields <jfie...@austininstruments.com> wrote:> On Wed, 24 Aug 2011 09:34:52 -0500, "bw" <bweg...@hotmail.com> wrote: > > >"davew" <david.wo...@gmail.com> wrote in message > >news:aff45f3b-ff96-4d35-b3e0-d53ed85225dc@d25g2000yqh.googlegroups.com..=.> >> I'm searching for a simple one chip solution if anyone has any ideas. > >> Best I've found so far might be the old 8038 function generator chip. > > >XR2206 > > --- > No sine wave out. > > -- > JFThe 2207 doesn't but the 2206 does ;-)
Reply by ●August 24, 20112011-08-24
On Wed, 24 Aug 2011 07:26:42 -0700 (PDT), davew <david.wooff@gmail.com> wrote:>On Aug 24, 3:17�pm, Roberto Waltman <use...@rwaltman.com> wrote: >> davew wrote: >> >I'm searching for a simple one chip solution if anyone has any ideas. >> >Best I've found so far might be the old 8038 function generator chip. >> >> Sorry, not a single chip solution. But, if the system where this will >> be used already has a microcontroller, why not build your own? >> Because of the huge consumer electronics market there are many good >> and inexpensive audio codecs and DACs. (AK4425A for example) >> Feed it with the right data and wou can generate any waveform. >> A two-chip solution is probably doable - a micro with a built in ADC >> and an audio DAC. >> -- >> Roberto Waltman >> >> [ Please reply to the group. >> � Return address is invalid ] > >Hi Roberto, thanks for the idea. As it happens I want to stick to >analogue in this application. Bit of a dinosaur project in mind. ;-)You can find a few app notes with triangle-to-sine converters (using diodes or JFETs, typically). If you don't need a single-chip solution, that's another way, but the parts count will be relatively high. Getting relatively low distortion (<< 1~2 percent) over a wide range will not be all that easy. BTW, Maxim had a similar chip (MAX038) but I think it's as dead as a toenail as well.
Reply by ●August 24, 20112011-08-24
On Wed, 24 Aug 2011 09:30:41 -0600, hamilton <hamilton@nothere.com> wrote:>On 8/24/2011 9:07 AM, John Fields wrote: >> On Wed, 24 Aug 2011 09:34:52 -0500, "bw"<bwegher@hotmail.com> wrote: >> >>> >>> "davew"<david.wooff@gmail.com> wrote in message >>> news:aff45f3b-ff96-4d35-b3e0-d53ed85225dc@d25g2000yqh.googlegroups.com... >>>> I'm searching for a simple one chip solution if anyone has any ideas. >>>> Best I've found so far might be the old 8038 function generator chip. >>> >>> XR2206 >> >> --- >> No sine wave out. >> > > >Duh, check the data sheet......--- Duh, you're right. -- JF
Reply by ●August 24, 20112011-08-24
On Wed, 24 Aug 2011 09:30:41 -0600, hamilton <hamilton@nothere.com> wrote:>On 8/24/2011 9:07 AM, John Fields wrote: >> On Wed, 24 Aug 2011 09:34:52 -0500, "bw"<bwegher@hotmail.com> wrote: >> >>> >>> "davew"<david.wooff@gmail.com> wrote in message >>> news:aff45f3b-ff96-4d35-b3e0-d53ed85225dc@d25g2000yqh.googlegroups.com... >>>> I'm searching for a simple one chip solution if anyone has any ideas. >>>> Best I've found so far might be the old 8038 function generator chip. >>> >>> XR2206 >> >> --- >> No sine wave out. >> > > >Duh, check the data sheet......Yup, makes a nice phase-coherent FSK modem transmitter. I'm using them now, spares for a 25-year old distributed automation system. Story, eventually. John
Reply by ●August 24, 20112011-08-24
On 8/24/2011 2:22 AM, davew wrote:> I'm searching for a simple one chip solution if anyone has any ideas. > Best I've found so far might be the old 8038 function generator chip.LOL, at the Embedded Systems Conference Exar had a booth, and I said, "oh you make that function generator chip." They said "yeah, about a million years ago." Well actually they still make one. The XR2206 does have sine wave out and looks to be a suitable replacement for the XR8038. Probably a bit overkill for what you need, and rather expensive, but nothing else comes to mind with that level of control. <http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_34972_-1> <http://www.jameco.com/Jameco/Products/ProdDS/34972.pdf> I built a little function generator when I was in college using an Exar chip. I wirewrapped it. Now you can buy the Elenco FG-500 for $30 as a kit, or $45 assembled, and it's based on the XR2206. <http://www.testequipmentdepot.com/elenco/generators/function-generators/fg500.htm#00036571?ref=gbase> The problem with that chip is the frequency drifts quite a bit as the timing components change with temperature. Hopefully your application isn't critical in terms of frequency, if it is you should use a DSP.
Reply by ●August 24, 20112011-08-24
< http://www.tinaja.com/mssamp1.asp > -- Many thanks, Don Lancaster voice phone: (928)428-4073 Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 rss: http://www.tinaja.com/whtnu.xml email: don@tinaja.com Please visit my GURU's LAIR web site at http://www.tinaja.com
Reply by ●August 24, 20112011-08-24
On Wed, 24 Aug 2011 21:55:02 +1000, Phil Allison wrote:> "dave wanker" > > > ** FFS - define " low frequency "' > > We are not fucking mind readers !!!!!!!!! > > You stupid POS.This from Phil "All conceivable operational amplifiers can drive only 20mA" Allison. C'mon Phil, make an assumption and run with it. Wait to get pissed off when your assumption turns out to be totally wrong. And take your meds. -- www.wescottdesign.com
