CC2400-RTR1 datasheet(66/83 Pages) TI

66 / 83 page

CC2400

SWRS042A

Page 66 of 83

LMTST (0x12) - LNA and receive mixers test register

Bit

Field Name

Reset

R/W

Description

15:14

Reserved, write as 0.

RXMIX_HGM

R/W

Receiver mixers high gain mode enable.

12:11

RXMIX_TAIL[1:0]

R/W

Control of the receiver mixers output current.

0: 12 µA

1: 16 µA (Nominal)

2: 20 µA

3:24 µA

10:9

RXMIX_VCM[1:0]

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

Must be set to 0 during chip initialisation.

8:7

RXMIX_CURRENT[1:0]

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)

6:5

LNA_CAP_ARRAY[1:0]

R/W

Selects varactor array setting in the LNA

0: OFF

1: 0.1pF (x2) (Nominal)

2: 0.2pF (x2)

3: 0.3pF (x2)

LNA_LOWGAIN

R/W

Selects low gain mode of the LNA

0: 19 dB (Nominal)

1: 7 dB

3:2

LNA_GAIN[1:0]

R/W

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

1:0

LNA_CURRENT[1:0]

R/W

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-RTR1 数据表(PDF) 66 Page - Texas Instruments

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