• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 16 subscribers
  • Views 772 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TRF7970AEVM: transmitter

mossaab daiki
Prodigy 250 points

Part Number: TRF7970AEVM

Hello

I saw in TI datasheet that power could be 100mW or 200 mW in maximum. I would like to know if there are any curves show the input voltage vs power for TRF7970AEVM. I tried to quntify the power using P=V2/R. I obtained in best case power value around micro watt which is very low comparing to datasheet. Anyone could explain mewhat happen ??

Thanks

Mossaab

  • 0
    TI__Guru* 91206 points

    Mossaab - 

    with +5VDC in, full power out of the transmitter (Chip Status Control Register set for 0x21) is 200mW or +23dBm, half power (with Chip Status Control Register set for 0x31) is 100mW or +20dBm. 

    with +3.3VDC in, full power out of the transmitter (Chip Status Control Register set for 0x20) is ~66mW or ~+18dBm, half power (with Chip Status Control Register set for 0x30) is ~30mW or ~+15dBm. 

    for your viewing ease, i made this chart based on measurements I made on one unit at room temp, for +5VDC to 3.4VDC input to the TRF79xxA (vertical axis is power out, horizontal axis is Vin), with the Chip Status Control Register Set for 0x21.

  • 0 in reply to Josh Wyatt
    Prodigy 250 points
    Hello
    Thank you for your answer. shal I use the PIN Vin and GND to supply with voltage different to 5V. Actually I am using USB cable to supply the TRF7970A EVM reader.
    Thanks