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CC113LRGPR Datasheet(PDF) 34 Page - Texas Instruments |
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CC113LRGPR Datasheet(HTML) 34 Page - Texas Instruments |
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34 / 86 page  CC113L SWRS108B – MAY 2011 – REVISED JUNE 2014 www.ti.com 5.12.3.1 CS Absolute Threshold The absolute threshold related to the RSSI value depends on the following register fields: • AGCCTRL2.MAX_LNA_GAIN • AGCCTRL2.MAX_DVGA_GAIN • AGCCTRL1.CARRIER_SENSE_ABS_THR • AGCCTRL2.MAGN_TARGET For given AGCCTRL2.MAX_LNA_GAIN and AGCCTRL2.MAX_DVGA_GAIN settings, the absolute threshold can be adjusted ±7 dB in steps of 1 dB using CARRIER_SENSE_ABS_THR. The MAGN_TARGET setting is a compromise between blocker tolerance/selectivity and sensitivity. The value sets the desired signal level in the channel into the demodulator. Increasing this value reduces the headroom for blockers, and therefore close-in selectivity. It is strongly recommended to use SmartRF Studio SWRC176 to generate the correct MAGN_TARGET setting. Table 5-11 show the typical RSSI readout values at the CS threshold at 2.4 kBaud and 250 kBaud data rate respectively. The default reset value for CARRIER_SENSE_ABS_THR = 0 (0 dB) has been used. MAGN_TARGET = 3 (33 dB) and 7 (42 dB) have been used for 2.4 kBaud and 250 kBaud data rate respectively. For other data rates, the user must generate similar tables to find the CS absolute threshold. Table 5-10. Typical RSSI Value in dBm at CS Threshold with MAGN_TARGET = 3 (33 dB) at 2.4 kBaud, 868 MHz MAX_DVGA_GAIN[1:0] 00 01 10 11 000 –97.5 –91.5 –85.5 –79.5 001 –94 –88 –82.5 –76 010 –90.5 –84.5 –78.5 –72.5 011 –88 –82.5 –76.5 –70.5 MAX_LNA_GAIN[2:0] 100 –85.5 –80 –73.5 –68 101 –84 –78 –72 –66 110 –82 –76 –70 –64 111 –79 –73.5 –67 –61 Table 5-11. Typical RSSI Value in dBm at CS Threshold with MAGN_TARGET = 7 (42 dB) at 250 kBaud, 868 MHz MAX_DVGA_GAIN[1:0] 00 01 10 11 000 −90.5 −84.5 −78.5 −72.5 001 −88 −82 −76 −70 010 −84.5 −78.5 −72 −66 011 −82.5 −76.5 −70 −64 MAX_LNA_GAIN[2:0] 100 −80.5 −74.5 −68 −62 101 −78 −72 −66 −60 110 −76.5 −70 −64 −58 111 −74.5 −68 −62 −56 34 Detailed Description Copyright © 2011–2014, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: CC113L |
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