Subj : Re: New Pico2 To : lugnut808@spam.yahoo.com From : john larkin 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 * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3) .