4X DAC Design for Multiflex using Atmega16 and AD7528 DAC chip

Started by huiyangdoh December 8, 2007
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, PortC0-1
(SDA/SCL) of Atmega 16 will be used to drive the DAC circuit which will
output variable voltage 0DVc - 10DVc at fix current 25mA using Op Amp.
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.
--- In a..., "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, PortC0-1
> (SDA/SCL) of Atmega 16 will be used to drive the DAC circuit which
will
> output variable voltage 0DVc - 10DVc at fix current 25mA using Op
Amp.
> 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.
>

If you want to use the AD7528, you can not connect it directly on the
TWI interface sinds it is a DAC with a paralel interface if you want to
use it on the TWI you will need to connect it via 2x PCF8574 or
something simular.