I have a couple of questions regarding using a precision voltage reference on a DAC - AD7545A.
I am trying to fix an existing circuit that uses AD584 to provide a 5V DAC (AD745A) to provide an Analog Output between 0 to 5V using a circuit design similar to this figure 4 on the AD7545A datasheet.
And then it is stepped up (amplified to 0 - 12V) with a high current opamp OPA548 to drive a load.
Now, my question is can I use AD7545A to provide the 0 - 12 V output without going through an extra space? I will have to replace the AD711 in the figure with OPA548 to drive the load, and also I will need a precision voltage reference that can provide a 12 V reference to the DAC. AD584 has only 4 programmable outputs - 10,7.5,5 and 2.5. What would be a good replacement.
Well, and the second question is, that in case I have to use the existing circuit, the application notes I found on the AD584 datasheet shows it giving a -10V reference to DAC using the configuration of figure 16.
I would like to give it a +ve 5 V reference instead. Is it as easy as as just connecting the +5V pin to the Vdd of the DAC, providing the 15V Vin to 584 and grounding the common?
Sorry, I tried posting the figures here, but as a new user I cannot post pictures yet.