« previous next »
Pages: 1 [2]   Go Down

Author Topic: R-2R resistor ladder  (Read 8551 times)

0 Members and 1 Guest are viewing this topic.

Offline Keoni29

  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2466
  • Rating: +291/-16
    • View Profile
    • My electronics projects at 8times8
Re: R-2R resistor ladder
« Reply #15 on: June 01, 2013, 07:44:57 am »
What else can we say about r2r ladders? We're talking about digital to analogue and vice versa converters.
Logged
If you like my work: why not give me an internet?







Offline SpiroH

  • LV8 Addict (Next: 1000)
  • ********
  • Posts: 729
  • Rating: +153/-23
    • View Profile
Re: R-2R resistor ladder
« Reply #16 on: June 12, 2013, 09:37:23 am »
Quote from: Keoni29 on June 01, 2013, 07:44:57 am
What else can we say about r2r ladders? We're talking about digital to analogue and vice versa converters.
Well, why do you bother to build yourself such a thing? If that's only for learning purposes i can take that, but otoh the simulator ouput should be enough. Else why don't you just buy an off-the-shelf component (dac/adc) with much higher resolution/precision and smaller footprint?  FYI R-2R networks are normally built with integrated matched resistor values. Building it with discrete components is doomed to failure. Cheers,
« Last Edit: June 12, 2013, 09:37:57 am by SpiroH »
Logged

Offline leafy

  • CoT Emeritus
  • LV10 31337 u53r (Next: 2000)
  • *
  • Posts: 1554
  • Rating: +475/-97
  • Seizon senryakuuuu!
    • View Profile
    • keff.me
Re: R-2R resistor ladder
« Reply #17 on: June 12, 2013, 10:50:33 am »
The ADC on the atmega/arduino chipset is notoriously slow, however. If you need speed, you might want to get a dedicated high-speed ADC (I generally use the SPI interface with an Arduino)
Logged
In-progress: Graviter (...)

Offline Keoni29

  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2466
  • Rating: +291/-16
    • View Profile
    • My electronics projects at 8times8
Re: R-2R resistor ladder
« Reply #18 on: June 12, 2013, 11:17:32 am »
DAC and ADC are very expensive. Especially i2c ones.
« Last Edit: June 12, 2013, 11:17:48 am by Keoni29 »
Logged
If you like my work: why not give me an internet?







Offline leafy

  • CoT Emeritus
  • LV10 31337 u53r (Next: 2000)
  • *
  • Posts: 1554
  • Rating: +475/-97
  • Seizon senryakuuuu!
    • View Profile
    • keff.me
Re: R-2R resistor ladder
« Reply #19 on: June 12, 2013, 12:10:19 pm »
You can get free samples from TI for some fairly powerful ADCs.
Logged
In-progress: Graviter (...)

Offline Keoni29

  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2466
  • Rating: +291/-16
    • View Profile
    • My electronics projects at 8times8
Re: R-2R resistor ladder
« Reply #20 on: June 12, 2013, 12:16:58 pm »
Samples? I never get those. I am not a university nor big company (not even a small one). TI is not known for throwing samples at everyone.
Logged
If you like my work: why not give me an internet?







Offline leafy

  • CoT Emeritus
  • LV10 31337 u53r (Next: 2000)
  • *
  • Posts: 1554
  • Rating: +475/-97
  • Seizon senryakuuuu!
    • View Profile
    • keff.me
Re: R-2R resistor ladder
« Reply #21 on: June 12, 2013, 12:45:55 pm »
they actually have options for individuals, IIRC. Just find the chips you want and request a free sample if they're available (sometimes they're not, but I've always found the chips I need).
Logged
In-progress: Graviter (...)
Pages: 1 [2]   Go Up
« previous next »