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ordering single quanitys of ic's — Parallax Forums

ordering single quanitys of ic's

SawmillerSawmiller Posts: 276
edited 2006-06-24 20:57 in General Discussion
hi all,
anyone know where i can order single quanitys of a a/d converter chip ?
i know parallax has the maxim 1270 for about $30 , however i dont need 8 channels...
the maxim 1272 has one channel, 12 bits , low volts and spi, and most important allows me to measure a 0-10vdc input.... sells for 6.75, if i want to buy 1k rolleyes.gif
so... whos your fav non parallax chip retailers ?... this a/d will be used by a proppellor, so the 3 v ones are preffered.

dan

Comments

  • RDL2004RDL2004 Posts: 2,554
    edited 2006-06-20 01:01
    The best supplier will be the one who has the part you need in stock in single quantities. Where are you located? I normally use Mouser since they are close and I get 2 day sevice by UPS ground. Bear in mind that most of the bigger distributers are going to use UPS or FedEx, so minimum shipping will be $7 or $8 even for just one small part. Digi-Key (handling fee for orders under $25) and Newark are two other large distributors.

    - Rick
  • SawmillerSawmiller Posts: 276
    edited 2006-06-20 01:29
    located in the middle of nowhere in tn.....

    mouser didnt have maxims when i looked, however i prolly need to widen my search a triffle... havent looked at newark either... thanks

    dan
  • pjvpjv Posts: 1,903
    edited 2006-06-20 03:59
    hi Sawmiller;

    You can make a virual A/D out of an SX, two resistors, one capacitor, and 8 or so lines of code. Beside the SX, which you may already be using, about 5 cents!

    Cheers,

    Peter (pjv)
  • tperkinstperkins Posts: 98
    edited 2006-06-20 10:29
    One thing I've looked for is an A/D with at least one 18 bit+ channel, preferably two, and between two and four 12bit channels. I could always filch a 2704 from work (24+ bits with a 4wire RTD) but then I'd be a filcher...

    ...And go figure, you just don't see those in the trash and fixable all that often.

    Yours, Tom Perkins
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2006-06-20 11:42
    · Jameco, DigiKey, Mouser...
    · What's it matter where they're located?· Everything goes by common-courier and gets delivered to big or small, regardless.

    · 0-10V input?· Well, that's what scaling resistors (voltage dividers) are all about.· Why paint yourself into a corner?

    · Post Edit -- didn't find a max1272 at mouser, digikey, jameco, or newark.

    Post Edited (PJ Allen) : 6/20/2006 11:46:12 AM GMT
  • Bruce BatesBruce Bates Posts: 3,045
    edited 2006-06-20 12:02
    Folks -

    If you have a part number and are looking to source it, here is a very handy search engine which will search 22 different distributors and resources concurrently:
    http://www.findchips.com/

    Regards,

    Bruce Bates

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  • RDL2004RDL2004 Posts: 2,554
    edited 2006-06-20 12:47
    Since Findchips comes back with no matches, you might try and request a free sample [noparse]:)[/noparse]



    https://shop.maxim-ic.com/storefront/welcome.do#

    (fourth item down in the left side menu)

    Post Edited (RDL2004) : 6/20/2006 1:08:35 PM GMT
  • SawmillerSawmiller Posts: 276
    edited 2006-06-20 14:45
    on the topic of using the sx-28 for a ADC, thats a nice solution , except i need 48" span and a 1/32" accuracy which comes out to 1500 or so points, so prolly a 11 bit a/d would work, and whenever i work with the sx-28 i have a hard time when i go past the byte level..8 bit, maybe once the sx/b goes to word values... its not the sx's fault, just my embarassment for having to take my shoes off to count above 8 bits
    thanks for the pointer for the findchips thou..
    dan
  • DunnseptDunnsept Posts: 115
    edited 2006-06-20 14:57
    RDL2004 has it right.. if you only need one chip, go to maxim and fill out the form.. they'll send you one as a sample, no cost to you. Obviously they are hoping that you are from some big firm and you will then buy thousands of their chips. But they'll send the sample regardless. I asked for and received 3 different chips from them. They also send them priority mail. I think I had mine in about a week total (from request date)

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  • RGuyserRGuyser Posts: 90
    edited 2006-06-21 20:22
    i recently wanted some samples from maxim... 3 or 4 different things.. i accidently submitted my sample request 3 times... something like $300 of parts arrived. i even sent them an email asking to please disregard the second 2 orders, as i am not greedy... it only took maybe 3 days...

    i recomend it.. microchip is similar.

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  • crgwbrcrgwbr Posts: 614
    edited 2006-06-23 19:55
    You could try analog.com

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  • Paul BakerPaul Baker Posts: 6,351
    edited 2006-06-24 20:57
    Maxim has alot of ICs that noone carries, fortunately you can buy directly from Maxim and almost all are availible in single quantities. Type the part number in here https://shop.maxim-ic.com/storefront/welcome.do on the price and availibilty page.

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