>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 02 August 2005 01:17
>To: 'Microcontroller discussion list - Public.'
>Subject: RE: [PIC] PIC architecture and fast ADC
>
>
>He actually told me that it is not a process issue even though 
>he did mention that things like EMC/EMI get tricky when going 
>to fine process like 0.25um or lower with lower Vdd and lower 
>latch-up threshold voltage. He specifically said that it is
>an architecture issue and they would have to come out
>something like PIC20 to incorporate this. Of course this
>is not a highly sought features in the low end so they
>will not come out a PIC20 architecture just to make faster
>ADC possible. However I still do not quite understand this.
>
>We have also requested that the resolution in the comparator 
>voltage reference unit should get better ( better than the
>32 steps high range /24 steps low range right now).
>
>By the way, there are faster ADCs (500ksps) in the dsPIC side.
>
>For high resolution, take a look at Silabs C8051F064. They
>even have a US$29 demo kit with built in USB interface
>to program the chip.
>

I was going to say that possibly he means the architecture of the current A/D peripheral is not suitable for high speeds, but what he said really doesn't make sense.

I have been looking at the Silabs parts, and will probably use them for some projects.  However, they do have one downside, which is that they have dedicated port and peripheral pins, unlike a PIC/Atmel etc were they are multiplexed.  This means if you have a application were a lot of IO is required, you'd need a larger Silabs device than PIC or Atmel e.g. in my current project we would need a 100pin Silabs part, but an 80 pin PIC gives us more than enough IO.  Apart from that, they seem to be very nice parts.

Regards

Mike

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