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Design >> Mixed-Signal Design >> R-2R DAC v.s. resistor -string DAC
https://designers-guide.org/forum/YaBB.pl?num=1310528147

Message started by nxing on Jul 12^th, 2011, 8:35pm

Title: R-2R DAC v.s. resistor -string DAC
Post by nxing on Jul 12^th, 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

Title: Re: R-2R DAC v.s. resistor -string DAC
Post by raja.cedt on Jul 12^th, 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.

Title: Re: R-2R DAC v.s. resistor -string DAC
Post by loose-electron on Jul 13^th, 2011, 1:01pm

R2-R works on principle of current division. They have issues with bias sensitivity resistors and parasitic effects.

Title: Re: R-2R DAC v.s. resistor -string DAC
Post by chaojixin on Jul 25^th, 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?

Title: Re: R-2R DAC v.s. resistor -string DAC
Post by harpoon on Jul 25^th, 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 ...