AVR-Chat

You might do better using something like a Microchip MCP4922.  It has a 
serial SPI interface, 12 bit accuracy, 14 pin dip package, dual DAC, and 
rail to rail outputs for starters.  We use the MCP4921 single DAC 
version here regularly with good results.  We have used the '4922 in a 
couple of applications with good results too.  This would give you a 
smaller package, higher accuracy module with better crosstalk, lower 
power consumption, and better temperature specifications.  They only 
operate at 5 volts, but if you need higher voltage operation you'd have 
to add interface circuitry anyway between your controller and your DAC.

They're cheap, too.


REB


huiyangdoh wrote:

>I am trying to develop DAC circuitry for Atmega 16 since Atmega16
>doesn't have in-built feature of DAC. The circuitry design will be 4X
>DAC design using AD7528 DAC Chips. To my understanding,the 4X DAC 
>circuit would be using 11 ports lines of Atmega16 where PortC0-PortC7 
>would be input to the 8-bit parallel AD7528 chip and 3 ports lines 
>(PortD0-Port2)would be used as control line inputs. The requirement of 
>this DAC circuit is that it would produce variable voltage (0DVc - 
>10DVc) at fix current of 25mA. I will plan to locate Op Amp in the 
>output of every AD7528 DAC chip. 
>
>I am not trying to ask anyone to do homework for me but I may treat
>here as a resource to gain ideas for the development I am working on.
>I will appreaciate anyone helping me by having discussions and making
>suggestions related to this topic. Kindly show me any link related to 
>this topic if u know any. Best Regards.  
>
>
>  
>