CC2430-RTR1-F64Z datasheet(183/234 Pages) TI

183 / 234 page

CC2430

CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A

Page 183 of 232

14.26 Frequency and Channel

Programming

The operating frequency is set by

programming the 10 bit frequency word

located in FSCTRLH.FREQ[9:8] and

FSCTRLL.FREQ[7:0].

The

operating

frequency FC in MHz is given by:

FC = 2048 + FREQ[9:0] MHz

where FREQ[9:0] is the value given by

FSCTRLH.FREQ[9:8]:FSCTRLL.FREQ[7

:0]

In receive mode the actual LO frequency

is FC – 2 MHz, since a 2 MHz IF is used.

Direct conversion is used for transmission,

so here the LO frequency equals FC. The

2 MHz IF is automatically set by

CC2430,

so the frequency programming is equal for

RX and TX.

IEEE 802.15.4 specifies 16 channels

within the 2.4 GHz band, numbered 11

through 26. The RF frequency of channel

k is given by [1] :

FC = 2405 + 5 (k-11) MHz, k=11, 12, ..., 26

For

operation

channel

the

FSCTRLH.FREQ:FSCTRLL.FREQ register

should therefore be set to:

FSCTRLH.FREQ:FSCTRLL.FREQ = 357 +

5 (k-11)

14.27 VCO and PLL Self-Calibration

14.27.1 VCO

The VCO is completely integrated and

operates at 4800 – 4966 MHz. The VCO

frequency is divided by 2 to generate

frequencies in the desired band (2400-

2483.5 MHz).

14.27.2 PLL self-calibration

The VCO's characteristics will vary with

temperature, changes in supply voltages,

and the desired operating frequency.

In order to ensure reliable operation the

VCO’s bias current and tuning range are

automatically calibrated every time the RX

mode or TX mode is enabled, i.e. in the

RX_CALIBRATE, TX_CALIBRATE and

TX_ACK_CALIBRATE control states in

Figure 52 on page 180.

14.28 Output Power Programming

The RF output power of the device is

programmable and is controlled by the

TXCTRLL.PA_LEVEL RF register. Table

43 shows the output power for different

settings,

including

the

complete

programming of the TXCTRLL control

the radio itself.

PA_LEVEL

TXCTRLL

Output Power

[dBm]

Current

consumption [mA]

0xFF

17.4

0xFB

-1

16.5

0xF7

-3

15.2

0xF3

-5

13.9

0xEF

-7

12.5

0xEB

-10

11.2

0xE7

-15

9.9

0xE3

-25

8.5

Table 43: Output power settings

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