ATD conversion

[tinhnho]

If i have the internal RC oscillator for the ATD is used, it has a period of from 2 to 6 microseconds. What is the range of times (in microseconds)required for an ATD conversion using this clock source for the ATD? Can anyone help me this ? thanks alot

 

[VEBill]

Insufficient info. Start with the complete part number of the ATD (Analog to Digital converter?).

 

[itsmoked]

Agreed, what the heck is an ATD(automatic toad destroyer)?

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[logbook]

The minimum possible conversion time is 2µs, that is one clock cycle. However many converters take 12 or 16 clock cycles to do a complete conversion, it depends on the particular part used.

Given the scant data you have presented I would bracket the complete conversion cycle between one smallest clock cycle and 16 slowest clock cycles, that is between 2µs and 96µs.

 

[Skogsgurra]

What does a "Specifier/Regul" do?

And if it is what I think, should he ask questions like this?

And, if he should. Shouldn't the question be better "specified"?

And, finally. If he cannot specify the question. And if he doesn't understand the answer. What will his "Specification" look like - and what will it be good for? Not to mention the "Regul" part?

Gunnar Englund

http://www.gke.org

 

[tinhnho]

Sorry guys,

ATD = Analog to digital

 

[zeitghost]

We got that far, now what is the A2D part number...? )

Please.

Pretty Please...

etc.

 

[tinhnho]

i'm using pic18f452, few resisters,and capacitors

 

[felixc]

On the PICs that I've used, there are registers in the PIC that you can program to tell the A/D on how many clock cycles you want the conversion to be done. The longer it takes, the best precision you get. So it is a balance of how quickly you need the measurements to be taken, versus how precise should the measurements be. There should be something like this in your PIC too, if you read the datasheet section for the A/D. If measurement period is not an issue, make it long, it will avoid headscratching in the future about why your measurements are not stable.

 

[tinhnho]

thanks for the response, i have checked the datasheet but could not find it.

Logbook's suggestion is between 2µs and 96µs, and i hope this right

 

[itsmoked]

Well check it again...
Page:165-171 specifically discusses this topic with worked out details and an example.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com