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KYama19
Beginner
1,559 Views

EM2140: Bypass capacitor for the VCC pin

Hi,

 

We are designing the power supply used for Arria 10 using EM2140

(and so forth).  In the datasheet Rev E of EM2140[1], Figure 14 shows

there is no bypass capacitor at the VCC pin even though there is

a series FB in the line.  However, we believe there should be

a capacitor in front of the internal LDO.  Is it forgotten to write, or

is there a capacitor internally in the module?  Otherwise, is there

a reason must not to have it?

 

Thanks in advance.

Regards,

 

[1] https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ds/em2140_13150.pdf

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2 Replies
Rahul_S_Intel1
Employee
101 Views

Hi ,

In the figure 14 , capacitor is mentioned from the 5 V. Attaching the screen shot for your reference. Let me know, is my understanding of your questing is correct.

 

Regards,

Rahul S

KYama19
Beginner
101 Views

Hi Rahul,

Thank you for your response. What I meant is here. Usually any circuit requires its power supply to be low impedance.

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