CC1100-RTR1 datasheet(50/100 Pages) TI1

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CC1100

SWRS038D

Page 50 of 92

315 MHz

433 MHz

868 MHz

915 MHz

Default

Power

Setting

Output

Power

[dBm]

Current

Consumption,

Typ. [mA]

Output

Power

[dBm]

Current

Consumption,

Typ. [mA]

Output

Power

[dBm]

Current

Consumption,

Typ. [mA]

Output

Power

[dBm]

Current

Consumption,

Typ. [mA]

0xC6

8.7

24.5

7.9

25.2

8.9

28.3

7.9

26.8

Table 31: Output Power and Current Consumption for Default PATABLE Setting

Shaping and PA Ramping

With ASK modulation, up to 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 of the PATABLE.

Note that the ASK shaping feature is only

supported for output power levels up to -1

dBm and only values in the range 0x30–0x3F,

together with 0x00 can be used. The same is

the case when implementing PA ramping for

other modulations formats. Figure 23 shows

some

examples

ASK

shaping.

e.g 6

PA_POWER[2:0]

in FREND0 register

PATABLE(0)[7:0]

PATABLE(1)[7:0]

PATABLE(2)[7:0]

PATABLE(3)[7:0]

PATABLE(4)[7:0]

PATABLE(5)[7:0]

PATABLE(6)[7:0]

PATABLE(7)[7:0]

Index into PATABLE(7:0)

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 obtain optimum

PATABLE settings for various

output powers.

Figure 22: PA_POWER and PATABLE

Bit Sequence

FREND0.PA_POWER = 3

FREND0.PA_POWER = 7

Time

PATABLE[0]

PATABLE[1]

PATABLE[2]

PATABLE[3]

PATABLE[4]

PATABLE[5]

PATABLE[6]

PATABLE[7]

Output Power

Figure 23: Shaping of ASK Signal

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