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Author Topic: R-2R resistor ladder  (Read 8550 times)

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Offline Keoni29

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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.
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Offline SpiroH

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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 »
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Offline leafy

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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)
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Offline Keoni29

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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 »
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Offline leafy

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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.
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Offline Keoni29

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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.
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Offline leafy

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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).
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