I have never worked with the dsPIC30F4011 specifically (although I worked
with the 5013 and 6012 and 6014), but I have to tell you this anyway:

The effective max speed you can use will not only depend on the data sheet
(integrated by THE ERRATA!!! which MUST ALWAYS BE READ), but also by other
factors, not last (but often understimated) is the sampling time necessary,
which strongly depends by the output impedance of your source signal..

So it may be necessary to buffer with an OpAmp your input signal, if you wa=
nt
to reach the full speed "guaranteed" in the datasheet+ERRATA docs.

Greets,
Mario


At 19.46 2012.02.06, you wrote:
>I'm used to program in C but not in ASM. I usually do not take care how
>long takes to do a full ADC cycle, but now I have to.
>
>I'm working in an application that reads 6 analog inputs (an0 - an5),
>sequentialy or and it must be done fast, the fastest possible. The pic
>(dspic30f4011) works at its maximal Fosc (117,92 MHz with internal 7,37 an=
d
>PLLx16). I've read datasheet of dspic30f4011/4012 chapter 20 "10-BIT,
>HIGH-SPEED ANALOGTO-DIGITAL CONVERTER (ADC) MODULE" and dspic30f Family
>Reference Manual section 17 "10-bit A/D Converter", but it is not clear to
>me.
>
>I wil continue working in C, but my wish is to configure ADC operation thr=
u
>accessing registers (ADCON1, ADCON2, ADCON3, ADCHS, any more?)
>
>First of all, i'm not sure which is the max speed I can obtain for a 6
>diferent inputs, 1 Msps? 750 ksps? 600 ksps? Less? If 1 Msps is possible,
>then every read I've to reconfigure multiplexers to set a different input
>channel, how is it done? According to figure 20-1, for AN0
>How do I configure channels?
>I think there are automatic modes for up to 4 channels, but what about six=
?
>How do I configure registers to do that?
>Where do I read values from conversions, ADCBUF0 everytime? or ADCBUF0 - 5
>for each channel?
>
>As you can see, I'm a bit (a lot), confused about manually configuring ADC=
,
>any light on this will be apreciated.
>--=20
>http://www.piclist.com PIC/SX FAQ & list archive
>View/change your membership options at
>http://mailman.mit.edu/mailman/listinfo/piclist

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