Texas Instruments 3138 155 232931 - Manual (Page 68)

CC2420
SWRS041B Page 68 of 89
RXCTRL1 (0x17) - Receive control register 1
Bit Field Name Reset R/W Description
15:14 - 0 W0 Reserved, write as 0.
13 RXBPF_LOCUR 0 R/W Controls reference bias current to RX bandpass filters:
0: 4 uA (Reset value) Use 1 instead
1: 3 uA Note: Recommended setting
12 RXBPF_MIDCUR 0 R/W Controls reference bias current to RX bandpass filters:
0: 4 uA (Default)
1: 3.5 uA
11 LOW_LOWGAIN 1 R/W LNA low gain mode setting in AGC low gain mode.
10 MED_LOWGAIN 0 R/W LNA low gain mode setting in AGC medium gain mode.
9 HIGH_HGM 1 R/W RX Mixers high gain mode setting in AGC high gain mode.
8 MED_HGM 0 R/W RX Mixers high gain mode setting in AGC medium gain mode.
7:6 LNA_CAP_ARRAY[1:0] 1 R/W Selects varactor array setting in the LNA
0: OFF
1: 0.1pF (x2) (Nominal)
2: 0.2pF (x2)
3: 0.3pF (x2)
5:4 RXMIX_TAIL[1:0] 1 R/W Control of the receiver mixers output current.
0: 12 µA
1: 16 µA (Nominal)
2: 20 µA
3: 24 µA
3:2 RXMIX_VCM[1:0] 1 R/W Controls VCM level in the mixer feedback loop
0: 8 µA mixer current
1: 12 µA mixer current (Nominal)
2: 16 µA mixer current
3: 20 µA mixer current
1:0 RXMIX_CURRENT[1:0] 2 R/W Controls current in the mixer
0: 360 µA mixer current (x2)
1: 720 µA mixer current (x2)
2: 900 µA mixer current (x2) (Nominal)
3: 1260 µA mixer current (x2)