Originally Posted by SoNic67 http://www.ti.com/europe/downloads/Choose%20the%20right%20data%20converter%20for%20your%20application.pdf
This is just a few extracts, you really need to be an electrical engineer with above-average math skills (linear conformal transformation) to understand all this.
R-2R—The oldest and still the “cleanest” conversion method
• String—A tapped resistor string
• Delta Sigma—(One bit) Trades resolution in amplitude for resolution in time. Requires a system clock that is faster than the bit data
Advantages of R-2R DACs
• Can achieve high performance INL & DNL
• Medium Settling Time Capability
• Low Noise R-2R Ladder
Delta-Sigma DAC Properties
• High resolution
• Low Power
• Voltage output
• Good Linearity
• Low Cost
• In Audio: moving noise out of audible range
• Settling time ~2ms
• Long Latency
• Not optimized for DC
See the higher settling time of generic sigma-delta converters. It's part of the conversion, no way around it.
The above is an obvious misrepresentation of the cited document. The document is looking at all DACs for all purposes, and among other things makes the point that say delta-sigma is not the best technology for digitizing high resolution fast refresh video.
It in fact does not recommend the use of R-2R DACs for audio.
The reason why settling time specs for Sigma-Delta DAcs looks so mediocre is the fact that they are generally have so much more resolution. It recommends the use of Sigma-Delta for audio.
Note the following 2 slides:
Applications for ∆Σ Converters
• Audio – System clock range ~ 20 to 40 MHz
– Has an Internal Digital Low-Pass Filter
– Optimized noise performance
– Optimized filter in audio frequency for flatness
Applications for R-2R DACs
• Automatic test equipment
• Precision Instrumentation
• Industrial control
• Data Acquisition systems
• Control Loop systems