What is better for 9-bit DAC? R-2R Dac or Charge-Scaling DAC

[tia_design]

9-bit DAC

I'm going to design a 9-bit DAC, which of the following two will give the better performance with less area: R-2R DAC and Charge-Scaling DAC. Thanks!

 

[onakaitai]

Re: 9-bit DAC

Both of them have advantage and disadvantage.

The advantages of R2R are small element spread, increased accuracy.
The advantages of charge scaling are best accuracy, no op amps.

On the contrary, R2R has disadvanteges as slower, sensitive to parasitic capacitance, nonmonotonic.
Charge scaling DAC has disadvantage as large area, sensitive to parasitic capacitance.

The choice is up to your purpose and design condition.

 

[muralicrl]

Re: 9-bit DAC

Hi,

Both are having their own advantages and disadvantages. If you are going for high speed application, you can go for R2R method. Because it is less sensitive to parasitic capacitance.

If you need more details, don't hesitate to contact me.

Regards,

N.Muralidhara
CRL-BEL