CC1010-RTY1 datasheet(118/152 Pages) TI

118 / 152 page

CC1010

SWRS047

Page 118 of 152

17.17 VCO, LNA and buffer current control

The VCO current is programmable and

should be set according to operating

frequency, RX/TX mode and output power.

The receiver sensitivity will also be

affected

the

current

settings.

Recommended

settings

for

the

CURRENT.VCO_CURRENT bits are shown

in the CURRENT register table following

below.

The bias current for the LNA, and the LO

and PA buffers are also programmable

through FREND.LNA_CURRENT,

FREND.BUF_CURRENT,

CURRENT.LO_DRIVE and

CURRENT.PA_DRIVE.

CURRENT (0xE1) - RF Current Control Register

Bit

Name

R/W

Reset value

Description

7:4

VCO_CURRENT

(3:0)

R/W

1100

Control of current in VCO core for TX and RX

0000 : 150

µA

0001 : 250

µA

0010 : 350

µA

0011 : 450

µA

0100 : 950

µA, use for RX, f< 500 MHz

0101 : 1050

µA

0110 : 1150

µA, use for RX f>500 MHz

0111 : 1250

µA

1000 : 1450

µA, use for TX f < 500 MHz

1001 : 1550

µA

1010 : 1650

µA

1011 : 1750

µA

1100 : 2250

µA

1101 : 2350

µA

1110 : 2450

µA

1111 : 2550

µA, use for TX, f>500 MHz

3:2

LO_DRIVE

(1:0)

R/W

Control of current in VCO buffer for LO drive

00 : 0.5mA, use for TX

01 : 1.0mA, use for RX when f<500 MHz

10 : 1.5mA

11 : 2.0mA, use for RX, f>500 MHz

1:0

PA_DRIVE

(1:0)

R/W

Control of current in VCO buffer for PA

00 : 1mA, use for RX

01 : 2mA, use for TX, f<500 MHz

10 : 3mA

11 : 4mA, use for TX, f>500 MHz

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