I'm trying to config the LMT detector of the AD9361 - on the AD-FMCOMMS3-EBZ mounted on ZC-706REV 1.2 board.
I familiar with the calculation formula for the level detect:
ℎ ℎ ( )= 16 ×( ℎ ℎ [5:0] +1)
when translate to dBm there is an issue with the translation.
I'm working with gain 70 dB and 18 MHz RF BW. I set a signal 40MHz higher and set the large LMT overload to 100 mV RMS - Translation to dBm is -10 dBm.
LMT gain should be 49 dB - ~10 (TIA filtering)= ~39 dB.
The overload large LMT 100mV. The large overload LMT indication indicate to "1" with input power of -48 dBm. up now everything is OK.
Please explain the 6 Bit register 0x107, 0x108 - the max. val can be 1.024V => ~28 dBm. Does the AD9361 LNA and mixer support those levels?
- Is it safe to set the limit so high and what is the max. input power out o band for the LNA and mixer.
- Can you please provide typical TIA filter shape? for each BBBW...