CC2400 Chipcon AS, CC2400 Datasheet - Page 60

• Manufacturer Part Number: CC2400
• Description: 2.4 GHz RF Transceiver
• Manufacturer: Chipcon AS

LMTST (0x12) - LNA and receive mixers test register
15:14
13
12:11
10:9
8:7
6:5
4
3:2
1:0
Chipcon AS
Bit
Field Name
-
RXMIX_HGM
RXMIX_TAIL[1:0]
RXMIX_VCM[1:0]
RXMIX_CURRENT[1:0]
LNA_CAP_ARRAY[1:0]
LNA_LOWGAIN
LNA_GAIN[1:0]
LNA_CURRENT[1:0]
SmartRF
®
CC2400 PRELIMINARY Datasheet (rev. 1.1), 2003-10-02
Reset
0
1
1
1
2
1
0
0
2
R/W
W0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
SmartRF
Description
Reserved, write as 0.
Receiver mixers high gain mode enable.
Control of the receiver mixers output current.
0: 12 µA
1: 16 µA (Nominal)
2: 20 µA
3:24 µA
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
Must be set to 0 during chip initialisation.
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)
Selects varactor array setting in the LNA
0: OFF
1: 0.1pF (x2) (Nominal)
2: 0.2pF (x2)
3: 0.3pF (x2)
Selects low gain mode of the LNA
0: 19 dB (Nominal)
1: 7 dB
Controls current in the LNA gain compensation branch
0: OFF (Nominal)
1: 100 µA LNA current
2: 300 µA LNA current
3: 1000 µA LNA current
Controls main current in the LNA
0: 240 µA LNA current (x2)
1: 480 µA LNA current (x2)
2: 640 µA LNA current (x2) (Nominal)
3: 1280 µA LNA current (x2)
®
CC2400
Page 60 of 73