>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 01 August 2005 10:33
>To: Microcontroller Discussion List - Public. (E-mail)
>Subject: [PIC] PIC architecture and fast ADC
>
>
>Last Friday we got a chance to meet a Microchip VP (SMTD 
>division) I was asking a problem regarding why Microchip could 
>not add fast 
>ADCs to PIC MCU (other than dsPICs) like those in Silabs C8051F3xx. 
>He told me it was an architecture problem.
>
>I could understand that why Microchip can not put a MCU into
>a 3mmx3mm small package like C8051F30x (bigger die than 8051 
>and process related issues) but I am not so sure why Microchip can 
>not put a fast ADC (10 bit and >= 200ksps). What could be 
>the problem?
>
>By the way, it is good that now Microchip starts to offer 
>4mmx4mm PICs in the 8/14/20 pin family. The features and price 
>are both okay. We may look at PICs again after switching to 
>Silabs for some new projects.
>

Much more likely a process issue, I'd have thought.  The current ADC works on a switched capacitor scheme rather than the traditional R2R ladder.  Presumably this is because it provides the best accuracy/lowest costs for the process that Microchip use, which gives a slower conversion rate but which is perfectly adequate for probably 99% of the applications a PIC would be used in.  Personaly I'd far rather they improved the resolution to 12bits on the higher end 18F rather than up the sample rate.

Regards

Mike

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