Reply by "Charles R. Grenz"●February 22, 20082008-02-22
Thank you Stefan for the information. It gives me a point of reference.
regards,
Charles
spoli58 wrote: > The input impedance of the ADC of LPC2xxx cannot be
found in their
> respective datasheets (I wonder why).
>
>
>
> The only indication is a note in the user manual (ADC chapter) that states
> the following:
>
>
>
> "It is suggested that RVSI is kept below 40 kohm."
>
>
>
> where RVSI is the impedance of the signal source. We can assume that the
> input impedance must be at least 10 times higher, i.e. > 400 kohm.
>
>
>
> I'm using this number in my application using LPC2136. I guess that
LPC2103
> uses the same ADC input circuit and has a similar input impedance.
>
>
>
> Stefan
>
>
>
>
>
> _____
>
> From: l... [mailto:l...] On Behalf Of
> Charles R. Grenz
> Sent: February 22, 2008 11:51 AM
> To: l...
> Subject: [lpc2000] LPC2103 ADC input impedance
>
>
>
> Hi all,
>
> Does anyone know what the input impedance for the ADC of the LPC2103 is?
>
> Also can anyone recommend a good book that explains USB 2.0?
>
> Thanks in advance,
> Charles
>
>
>
>
>
>
>
Reply by Martin Maurer●February 22, 20082008-02-22
Hello Charles,
> Also can anyone recommend a good book that explains
USB 2.0?
He also has it own website with tons of information: www.lvr.com and a
detailed description of his books.
You can also find answers from him in forum of www.usb.org
Regards,
Martin
Reply by "Charles R. Grenz"●February 22, 20082008-02-22
Hi all,
Does anyone know what the input impedance for the ADC of the LPC2103 is?
Also can anyone recommend a good book that explains USB 2.0?