A question about delta-sigma DAC output.

[starcoming]

In some datasheets about delta-sigma DAC products, I find that the DAC outputs are general not from 0 to Vdd, but from 0 to 0.65Vdd or so such as CS4344/5/6/8 from CIRRUS LOGIC. If it is to prevent the out of range of modulator, I think the output can swig from 0 to 0.8vdd or so.
Who knows the reason for the value 0.65.

 

[sunking]

of course, the output can be 0.8vdd, but at that conditons, the SNR will decrease.

 

[starcoming]

Why? Can you explain clearly?

 

[starcome]

To sunking:
really? If the input signal is multiplied with a factor 0.65 rather than 0.8, the output will lose more precision.

 

[sunking]

why not test it?
most delta sigma converter, have their own input and output range for design.
for DAC,the output range depond on the circuit design.