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The Designer's Guide Community Forum › Design › Mixed-Signal Design › R-2R DAC v.s. resistor -string DAC
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R-2R DAC v.s. resistor -string DAC (Read 1071 times)
nxing
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R-2R DAC v.s. resistor -string DAC
Jul 12th, 2011, 8:35pm  
Hello,
I am just wondering what's the different between a R-2R DAC and a resistor-ladder DAC, except that for the same resolution, R-2R use less components that the resistor-ladder.

Thanks

NX
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raja.cedt
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Re: R-2R DAC v.s. resistor -string DAC
Reply #1 - Jul 12th, 2011, 9:34pm  
read some adc basic book man....main in r-2r ladder you will see same resistance always whatever the bits you turn on.

Thanks.
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Re: R-2R DAC v.s. resistor -string DAC
Reply #2 - Jul 13th, 2011, 1:01pm  
R2-R works on principle of current division. They have issues with bias sensitivity resistors and parasitic effects.

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chaojixin
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Re: R-2R DAC v.s. resistor -string DAC
Reply #3 - Jul 25th, 2011, 2:00am  
I don't understand.resistor ladder DACs also have parasitic. can you please be more detailed? or give the list of some reference?
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Re: R-2R DAC v.s. resistor -string DAC
Reply #4 - Jul 25th, 2011, 3:25pm  
I think I have to agree with raja.cedt ... please have a look at the following wikipedia entry ...
http://en.wikipedia.org/wiki/Resistor_ladder

it gives a basic intro. If you have further questions, please be a bit more specific, i.e. what are your constraints, what are you looking to achieve, topology ... etc ...
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