CC1110-RTR1 datasheet(171/203 Pages) TI

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CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 171 of 202

voltage

temperature

has

changed

significantly).

15.15 Output Power Programming

The RF output power level from the device has

two levels of programmability, as illustrated in

Figure

39.

Firstly,

the

PA_TABLE7-

PA_TABLE0 registers can hold up to eight user

selected output power settings. Secondly, the

3-bit FREND0.PA_POWER value selects which

PA_TABLE7-0 register to use. This two-level

functionality provides flexible PA power ramp

up and ramp down at the start and end of

transmission, as well as ASK modulation

shaping.n each case, all the PA power settings

from

PA_TABLE0

from

the

FREND0.PA_POWER value are used.

The power ramping at the start and at the end

of a packet can be turned off by setting

FREND0.PA_POWER

zero

and

then

programming the desired output power in

PA_TABLE0. Table 49 contains recommended

PA_TABLE settings for various output levels

and frequency bands, together with current

consumption in the RF transceiver.

With ASK modulation, the eight power settings

are used for shaping. The modulator contains

a counter that counts up when transmitting a

one and down when transmitting a zero. The

counter counts at a rate equal to 8 times the

symbol rate. The counter saturates at

FREND0.PA_POWER and 0 respectively. This

counter value is used as an index for a lookup

in the power table. Thus, in order to utilize the

whole table, FREND0.PA_POWER should be 7

when ASK is active. The shaping of the ASK

signal is dependent on the configuration in the

PA_TABLE7-0 registers.

e.g 6

PA_POWER[2:0]

in FREND0 register

PA_TABLE0[7:0]

PA_TABLE1[7:0]

PA_TABLE2[7:0]

PA_TABLE3[7:0]

PA_TABLE4[7:0]

PA_TABLE5[7:0]

PA_TABLE6[7:0]

PA_TABLE7[7:0]

Index into PA_TABLE7-0

The PA uses

this setting.

Settings 0 to PA_POWER are used

during ramp-up at start of transmission

and ramp-down at end of transmission,

and for ASK/OOK modulation.

The SmartRF® Studio software

should be used to get optimum

PATABLE settings for various

output powers.

Figure 39: PA_POWER and PA_TABLE7-0

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