> From:   Damien Cahill[SMTP:damiencahill@AUSTARNET.COM.AU]
> Sent:         Sunday, October 19, 2003 5:27 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [EE]: high resolution DAC

> Instead of purchasing a DAC just make an R2R ladder network DAC.  We build
> one in our EE course in second year, it was 16bit accuracy and worked
> rather well.  You can just add more resistors to achieve the higher
> resolutions like 24bit or whatever you require.  I'm not sure how good they
> perform as far as distortion and non-linearity are concerned but at least
> it's an option.

How did you manage that? Even if you use 0.1% resistors, you can only
get 1 part in 1000 accuracy. Sixteen bits needs 1 in 65536 which is 15
parts per million. Are there resistors with that accuracy?

John Power

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