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General Question (Datasheets and Interfacing)

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cmos babe

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Let's say I want to interface an ADC with a Microcontroller. What values in the datasheet do I need to make sure that no IC will get damaged.

thx
 

Hi,
It would help if you stated which micro, and which ADC. I know that PICs generally have ESD protected inputs, and have directly connected them with Microchips ADCs and Linear Tech's ADCs.
If I understand correctly, you are interfacing an external ADC? In that case, I would look at your micro's data sheet under input specs. Hope this is of some help. I was doing something similar, and ended up just connecting the ADC to the micro directly. No problem.
Regards,
Robert
 

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    cmos babe

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BeeBop said:
Hi,
It would help if you stated which micro, and which ADC. I know that PICs generally have ESD protected inputs, and have directly connected them with Microchips ADCs and Linear Tech's ADCs.
If I understand correctly, you are interfacing an external ADC? In that case, I would look at your micro's data sheet under input specs. Hope this is of some help. I was doing something similar, and ended up just connecting the ADC to the micro directly. No problem.
Regards,
Robert
Click to expand...

Thanks for the answer.What I exactly have doubts about is Iih/Iil and Ioh/Iol values. For example if Iih of ,let's say, the PIC input is higher than Ioh of the ADC then there's a possibility to damage the ADC coz I'm forcing it to source more current than specified, is that correct? I will have to interface an ADC to an FPGA. The FPGA has internal ESD protection but as I understand the ESD protects from extra voltage but won't protect from excessive current.
 

cmos babe said:
ESD protects from extra voltage but won't protect from excessive current.
Click to expand...

The simplies way of overcurrent protection is to connect the devices through resistors. You can calculate the required resistance from the max allowable current and max available voltage. Post the part numbers for your PIC, FPGA and ADC, and we'll be able to come up with a better protection circuit.

BTW, if your ADC, PIC and FPGA are all on the same board or in the same box, you don't need to worry about the ESD protection.
 

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