NickK_chugchug
Tele-Holic
I'm trying to put this in a serial context but there's a multitude of reasons.
Noise
* each transition between digital and analogue injects noise
* smaller current loops with SMT, but once digital you're pretty resilient to noise, however analogue is a constant both in terms of clocking noise, power supply noise, RFI.. etc
* power efficiency of switchers means digital noise, and cleaning up for a long analogue chain adds cost.
Cost per function
* once in digital, a few components can do alot - the same math digital processing can do a variety of things at the same time, reducing parts, reducing the cost due to volume pricing, reduced vendor relationship costs, reduced weight for transport etc
* cost of components - the world runs on digital, so digital ICs and SMT are mainstream.
* Majority of people prefer a 80% there for cheap, to improve they throw away and buy the next 80% there, rinse and repeat.
Noise
* each transition between digital and analogue injects noise
* smaller current loops with SMT, but once digital you're pretty resilient to noise, however analogue is a constant both in terms of clocking noise, power supply noise, RFI.. etc
* power efficiency of switchers means digital noise, and cleaning up for a long analogue chain adds cost.
Cost per function
* once in digital, a few components can do alot - the same math digital processing can do a variety of things at the same time, reducing parts, reducing the cost due to volume pricing, reduced vendor relationship costs, reduced weight for transport etc
* cost of components - the world runs on digital, so digital ICs and SMT are mainstream.
* Majority of people prefer a 80% there for cheap, to improve they throw away and buy the next 80% there, rinse and repeat.