CLRC66301 Rx Tuning

[Jack117]

Hello,

I'm looking for some clarification around the tuning of CLR66301, specifically the external Rx components. When setting the voltage dividers at the RXP and RXN pins, the design guide (AN11019, section 4.4.1) mentions the acceptable range of voltages. Is this measured voltage single ended or differential? 

[fangfang]

Hello,

The internal receiving concept of the CLRC663 makes use both side-bands of the
subcarrier load modulation of the card response via a differential receiving concept (RXP, RXN).

For more information please kindly refer to the datasheet as the link.

URL:https://www.nxp.com/docs/en/data-sheet/CLRC663.pdf.

Have a nice day.

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[Jack117]

I have read that datasheet and it is still unclear to me. On pages 18 & 19 of the following document;

https://www.nxp.com/docs/en/application-note/AN11564.pdf

"peak voltage at Rxn and Rxp stays below 1.65Vpk." Is this peak voltage referenced between the two Rxp and Rxn pins, and must be measured with a differential probe? 

[fangfang]

Hello,

Thanks for your information. The Voltage is RXN/RXP between with GND.

Have a nice day.

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