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RSSI Symbol decoding

Question asked by jinojs on Nov 11, 2014
Latest reply on Nov 13, 2014 by jinojs

Hi,

 

I'm using the reference design (and code) of AD9364 for KC705.

I want to understand how I can read the RSSI from this. I referred UG672 (AD9364_Register_Map_Reference_Manual_UG-672.pdf) and UG673 (AD9364_Reference_Manual_UG-673.pdf) and also went through the code (function: ad9361_read_rssi).

 

My question is how exactly can I use the value read in 'rssi->symbol'?

UG672 mentions the following:

This register updates after every measurement interval. Typical valid range is 0 to 457(d) (for 9 bits). Resolution is 0.25 dB/LSB for 9 bits, 0.5 dB/LSB for 8 bits.

 

UG673 mentions the following:

The RSSI Symbol value is stored in 0.5 dB/LSB resolution. An additional LSB is also available, and if this bit is used, the resulting 9-bit word has a resolution of 0.25 dB/LSB. In either case, the range is 0 dB to −128 dB (note the negative sign).

 

I'm not able to understand how to match the above two range of values.

Using what conversion or formula should I convert the rssi->symbol value and represent it in dBm?

 

Please help me to understand this correctly.

 

Thank you,

~Jinoj

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