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AN1349/decoupling capacitor

Question asked by kotoo@fujiele.co.jp on Aug 18, 2016
Latest reply on Aug 23, 2016 by RAnslow

Please teach me decoupling capacitor.

 

There is the following description to P7 of AN1349.
> 'High Voltage Discrete Stitching Capacitor'
>The specific placement of decoupling capacitors, the discrete high voltage capacitor, and the ferrites on the VISOOUT and GND2 pins are critical to achieve CISPR22/EN55022B classification.
>The use of a high voltage discrete capacitor to pass emission limits has been proven for the ADM2587E powered for both 3.3 V and 5.0 V supplies, and for the ADM2582E powered at 5.0 V supply.


Do you have a issue using the laminated ceramic capacitor to this high voltage discrete capacitor?
Please teach me if there is a test track record or advice.


P3 of the following description was confirmed.
>The 10 μF capacitor on the VCC pin (Pin 7) provides a large charge reserve locally on the PCB.
>It is important that these capacitors have a very low equivalent series resistance (ESR) and low equivalent series inductance (ESL) at 180 MHz and 360 MHz.

 

Thank you.

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