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   REPLYADDR john larkin  2999f134   
   REPLY: <8xGwO.133651$bV6e.93535@fx08.ams4> 35df5758   
   PID: SoupGate-Win32 v1.05   
   XPost: sci.electronics.design   
      
   On Mon, 19 Aug 2024 22:04:19 +1000, Chris Jones   
    wrote:   
      
   >On 13/08/2024 12:43 pm, John Larkin wrote:   
   >> On Mon, 12 Aug 2024 18:41:59 +0200, Lasse Langwadt    
   >> wrote:   
   >>   
   >>> On 8/11/24 23:07, John Larkin wrote:   
   >>>> On Sun, 11 Aug 2024 14:04:36 -0700, John Larkin   
   >>>>  wrote:   
   >>>>   
   >>>>> On Sun, 11 Aug 2024 21:45:42 +0100, Andy Burns    
   >>>>> wrote:   
   >>>>>   
   >>>>>> Surprised nobody has mentioned the Pico2 boards (based on RP2350A or   
   >>>>>> RP2350B chips, instead of RP2040).   
   >>>>>>   
   >>>>>> 2x ARM cores plus 2x RISC-V cores (perm any 2 from 4)   
   >>>>>> 150 MHz with FPU instead of 133MHz without   
   >>>>>> lower power consumption   
   >>>>>> more I/O pins (B model only?)   
   >>>>>>   
   >>>>>> I really ought to buy a couple for tinkering ...   
   >>>>>>   
   >>>>>> official boards not available yet, but 3rd party boards are, e.g.   
   >>>>>>   
   >>>>>>    
   >>>>>>    
   >>>>>   
   >>>>> As of now, Digikey shows no stock on the Pico2 and doesn't recognize   
   >>>>> the RP2350 chip as a product. Ditto Mouser.   
   >>>>>   
   >>>>> The fast floats look great. I wonder how fast they are.   
   >>>>   
   >>>> The RP2350 data sheet is 1347 pages!   
   >>>>   
   >>>   
   >>> read the part on how the build in buck converter needs a custom inductor   
   >>> with polarity marking to work, and tell there is something seriously   
   >>> wrong with it   
   >>   
   >> The polarized inducor is strange. I'd expect that a small shielded   
   >> inductor would work fine. It is interesting to have a switching   
   >> regulator on a CPU chip... near a 12-bit ADC!   
   >   
   >I don't think they know much about how to do ADCs yet.   
   >   
   >Have a look at the performance of the RP2040 ADC - it is awful!   
   >   
   >http://pico-adc.markomo.me/   
   >   
   >I hope the new one is better.   
   >   
   >   
      
   It's tough to put a good 12-bit ADC on a 70 cent dual-core CPU chip.   
   The silicon process, the thermals, the ground loop and noise   
   environment, are all wrong.   
      
   The 2040 ADC has chunks of missing codes. It's probably usable as a   
   7-bit, 1% ADC. Some lowpass filtering, with some dithering, would   
   improve it but if you want precision, buy a separate ADC.   
      
   We use the ADCs in FPGAs and some other ARM processors, for crude   
   things like checking power supplies. Not for sellable instrumentation.   
      
   --- SoupGate-Win32 v1.05   
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