CC2500_11 Datasheet, PDF (76/96 Pages) Texas Instruments – Low-Cost Low-Power 2.4 GHz RF Transceiver

CC2500
0x1C: AGCCTRL1 – AGC Control
Bit Field Name
Reset R/W Description
7 Reserved
R0
6 AGC_LNA_PRIORITY
1
R/W Selects between two different strategies for LNA and LNA2
gain adjustment. When 1, the LNA gain is decreased first.
When 0, the LNA2 gain is decreased to minimum before
decreasing LNA gain.
5:4 CARRIER_SENSE_REL_THR[1:0] 0 (00) R/W Sets the relative change threshold for asserting carrier
sense.
Setting
Carrier sense relative threshold
0 (00)
Relative carrier sense threshold disabled
1 (01)
6 dB increase in RSSI value
2 (10)
10 dB increase in RSSI value
3 (11)
14 dB increase in RSSI value
3:0 CARRIER_SENSE_ABS_THR[3:0] 0
R/W Sets the absolute RSSI threshold for asserting carrier
(0000)
sense. The 2’s complement signed threshold is programmed
in steps of 1 dB and is relative to the MAGN_TARGET
setting.
Setting
Carrier sense absolute threshold
(Equal to channel filter amplitude when AGC
has not decreased gain)
-8 (1000) Absolute carrier sense threshold disabled
-7 (1001) 7 dB below MAGN_TARGET setting
…
…
-1 (1111) 1 dB below MAGN_TARGET setting
0 (0000) At MAGN_TARGET setting
1 (0001) 1 dB above MAGN_TARGET setting
…
…
7 (0111) 7 dB above MAGN_TARGET setting
SWRS040C
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