Hey, thanks for the comments, Personally I need no where near that sample rate, (somewhere in a few 10's-100's of kHz should be fine), but there are a few people who are after that sort of rate, using external ADC's. At the moment we are all trying to pool our efforts, just using the internal ADC until the ADC is the limiting factor. = Where exactly did microchip say make your own driver? I would be interested on any comments about the speeds achievable, as I don=92t believe I have se= en anything quoted for the microchip firmware... Mat www.piccoder.co.uk -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of Mauricio Giovagnini Sent: 23 April 2006 15:13 To: Microcontroller discussion list - Public. Subject: Re: [PIC] USB resistors Mat Clayton wrote: > Is anyone else working on ADC sampling through the USB currently? We are = > currently trying to figure out the best way to go about this,(aiming for a > few 100kHz-1Mhz if possible), any suggests or comments would be most = > welcome. > > Mat > = I will work with a 18F4520 in a near future, I've read some datasheets = regarding the USB connection. Just as an advice, If i understand weel, you are trying to do a 1M = sample A/D conversion? If you are thinking in using the internal A/D = module, as far as I know this is impossible with the pic you have, the = A/D is simply not that fast. Also a 1M samples at 10bits, will mean at the best 10Mbps usb = transmission. For that, as Microchip says, you should design your own = USB driver. Best Regards __________________________________________________ Correo Yahoo! Espacio para todos tus mensajes, antivirus y antispam =A1gratis! = =A1Abr=ED tu cuenta ya! - http://correo.yahoo.com.ar -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist