AVR-Chat

Yeah I know. In fact MCP4725 is my first choice but since I couldn't 
get it from the shop here, I would go with AD7528. So, any 
suggestion to design the 4X DAC using AD7528 for Atmega16? I crack 
my mind to search for this topic using Google but to no avail. 


--- In AVR-Chat@yahoogroups.com, "Roy E. Burrage" <RBurrage@...> 
wrote:
>
> 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.  
> >
> >
> >  
> >
>