topic Re: What should be the minimum RF input voltage amplitude between LA and LB, GND pad left floating, VLA-VLB peak to peak for IC NT3H2111? in NFC

What should be the minimum RF input voltage amplitude between LA and LB, GND pad left floating, VLA-VLB peak to peak for IC NT3H2111?

aabraham — Tue, 14 May 2019 18:44:45 GMT

What should be the minimum RF input voltage amplitude between LA and LB, GND pad left floating, VLA-VLB peak to peak for IC NT3H2111?

Re: What should be the minimum RF input voltage amplitude between LA and LB, GND pad left floating, VLA-VLB peak to peak for IC NT3H2111?

IvanRuiz — Thu, 16 May 2019 15:46:47 GMT

Hello,

Below the MIN and MAX values:

VI_RFmax = 4.6 Vrms
VI_RFmin = 2.2 Vrms

Limiter starts at 2.2 Vrms and IC becomes functional. Max voltage is 4.6 Vrms.

Hope this helps.

Best regards,

Ivan.

Re: What should be the minimum RF input voltage amplitude between LA and LB, GND pad left floating, VLA-VLB peak to peak for IC NT3H2111?

aabraham — Thu, 16 May 2019 16:24:41 GMT

Hello Ivan,

Thanks for your reply.

I could see Vi(RF) [VI_RFmax = 4.6 V) in the datasheet. But it is mentioned as Vpeak. If I go with the datasheet then I can have a maximum of 4.6V*2=9.2V pk-pk across the pins LA and LB. But if I consider your values then the maximum voltage could be 4.6V*1.414*2=13V pk-pk and minimum voltage could be 2.2V*1.414*2=6.22V pk-pk. Please correct me if I am wrong and let me know what values I have to consider in my design.

And I didn't find anything about VI_RFmin in the datasheet.

Thanks again.

Regards,

Anoop.

Re: What should be the minimum RF input voltage amplitude between LA and LB, GND pad left floating, VLA-VLB peak to peak for IC NT3H2111?

IvanRuiz — Fri, 17 May 2019 15:22:24 GMT

Hello Anoop,

Please consider the range below in Vrms:

VI_RFmax(rms) = 4.6 V
VI_RFmin(rms) = 2.2 V

Vi(RF) min is the minimum voltage for the IC to operate.

The correction to the unit of Vi(RF) max was already reported to the corresponding person and hopefully corrected in the next revision of the document. Thank you for your comprehension.

Have a nice day.

Best regards,

Ivan.

Re: What should be the minimum RF input voltage amplitude between LA and LB, GND pad left floating, VLA-VLB peak to peak for IC NT3H2111?

ben_devries — Wed, 19 Aug 2020 14:43:36 GMT

IvanRuiz‌

Hello Ivan,

I have a few questions adding on to discussion here.

1. Is there a new revision past revision Rev. 3.5 of the NT3H2111_2211 with the correction of the units for VI_RF max?

2. Is the max voltage of VI_RF is the voltage across LA-LB with the limiter circuitry in place or the max voltage without the limiter circuitry in place?

3. Is it possible to get more information about the electrical characteristics of the La-Lb pins including a more detailed equivalent circuit with limiter circuity included?

Thanks,

Ben