CC1000-RTR2 datasheet(28/55 Pages) TI

28 / 55 page

CC1000

SWRS048A

Page 28 of 55

18. VCO and LNA current control

The VCO current is programmable and

should be set according to operating

frequency RX/TX mode and output power.

Recommended

settings

for

the

VCO_CURRENT bits in the CURRENT

41.

The bias current for the LNA, and the LO

and PA buffers are also programmable.

Table 10 shows the current consumption

and

receiver

sensitivity

for

different

settings (2.4 kBaud Manchester encoded

data).

CURRENT register

FRONT_END register

RF freq-

uency

[MHz]

Current

consumption

[mA]

Sensitivity

[dBm]

VCO_

CURRENT

[3:0]

LO_DRIVE

[1:0]

PA_DRIVE

[1:0]

BUF_CUR

RENT

LNA_CUR

RENT[1:0]

433

9.3

-110

0100

433

7.4

-109

0100

868

11.8

-107

1000

868

9.6

-105

1000

Note: Current consumption and sensitivity are typical figures at 2.4 kBaud Manchester encoded data, BER 10

-3

Table 10. Receiver sensitivity as function of current consumption

19. Power management

CC1000 offers great flexibility for power

management in order to meet strict power

consumption

requirements

battery

operated applications. Power Down mode

is controlled through the MAIN register.

There are separate bits to control the RX

part,

the

part,

the

frequency

synthesiser and the crystal oscillator (see

page 39). This individual control can be

used to optimise for lowest possible

current

consumption

certain

application.

typical

power-on

and

initialising

sequence

for

minimum

power

consumption is shown in Figure 18 and

Figure 19.

PALE should be tri-stated or set to a high

level during power down mode in order to

prevent a trickle current from flowing in the

internal pull-up resistor.

PA_POW should be set to 00h before

power down mode to ensure lowest

possible leakage current.

CC1000-RTR2 Datasheet(PDF) 28 Page - Texas Instruments

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