Re: Some VREF fun...
Thanks Russ. Makes a lot of sense! Noise level from 30uV to 100nV 50db lower...
Russ White said:Ok for you die hard tweakers out there. I will throw you a bone.
Here is one mod which I know will pay dividends.
...
Now you have a sub 100nv (I will have to measure it later but I know its quite low) noise voltage reference that is not connected to the digital supply in any way.
You still have the excellent PSRR of the LM4562 and milliohm output impedance.
...
Cheers!
Russ
Thanks Russ. Makes a lot of sense! Noise level from 30uV to 100nV 50db lower...
Russ White said:Now if you really want to go crazy replace R1 in the VREF schematic with a 3-5ma CCS.
you mean the 120R?
eaoyama said:
you mean the 120R?
I think he means the 1k feeding the series leds
Russ White said:Now if you really want to go crazy replace R1 in the VREF schematic with a 3-5ma CCS.
The simplest ccs is an n-channle jfet with Vgs=0. Would this be a suitable part http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=J112FS-ND?
Thanks.
t. said:BTW, nice little circuit Russ, thanks for sharing
Oh your welcome.
I figure some of you might want something to do over the holidays.
glt said:
The simplest ccs is an n-channle jfet with Vgs=0. Would this be a suitable part http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=J112FS-ND?
Thanks.
Correct link: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=J112FS-ND
glt said:
The simplest ccs is an n-channle jfet with Vgs=0. Would this be a suitable part http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=J112FS-ND?
Thanks.
I believe 2SK117 GR or 2SK170 GR will do:
http://www.ampslab.com/components_fets.htm
http://www.bdent.com/search/search.jsp?contains=2SK170&category=ALL&submit.search=Search!
Russ White said:Just to show I actually tried it and it works (and sounds really nice)...
Thanks Russ.
One more here. Done with 2SK170-GR as ccs.
Don't ask yet. I don't even know if it's working or not.
Attachments
avr300 said:
Thanks Russ.
One more here. Done with 2SK170-GR as ccs.
Don't ask yet. I don't even know if it's working or not.
Looks good!
avr300 said:
Thanks Russ.
One more here. Done with 2SK170-GR as ccs.
Don't ask yet. I don't even know if it's working or not.
Ok, so is it working ok for you?
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- More Vendors...
- Twisted Pear
- Buffalo DAC (ESS Sabre 9008)