how to extend a 8bits DAC pecision to 10 bits 12bit and more

Question

I buy a AD9708 ,however its resolution is not enough for my system ，so I want to extend the resolution of DAC in software ,is there any way ? I read some articles of PWM ? sigma-delta ? thanks a lots for your answers

landsman · Accepted Answer

Hi Hhhcwx, 
 Sigma-delta is a specific converter architecture which sacrifices BW for improved noise spectral density across a narrow band. I am not sure on the processing requirements for such as setup. One would basically use noise-shaping to post process the data, assuming the carrier is at a low enough frequency. I am not sure on the best way to AD9708 implement this on an FPGA with a current-steering or a voltage DAC. But it can be theoretically done. 
 update: you may find the following application note interesting: 
 Sigma-Delta ADCs and DACs Application Note (AN-283) (analog.com) 
 Landsman)

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how to extend a 8bits DAC pecision to 10 bits 12bit and more