CC1021_12 datasheet(44/94 Pages) TI

Part #	CC1021

Description	Single Chip Low Power RF Transceiver for Narrowband Systems

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CC1021

SWRS045C

Page 44 of 87

13.

Transmitter

13.1. FSK Modulation Formats

The data modulator can modulate FSK,

which is a two level FSK (Frequency Shift

Keying), or GFSK, which is a Gaussian

filtered FSK with BT = 0.5. The purpose of

the GFSK is to make a more bandwidth

efficient system. The modulation and the

Gaussian filtering are done internally in the

chip. The TX_SHAPING

bit in the

DEVIATION register enables the GFSK.

Figure 22 shows a typical eye diagram for

153.6 kBaud data rate at 868 MHz

operation.

Figure 22. GFSK eye diagram. 153.6 kBaud, NRZ, ±79.2 kHz frequency deviation.

13.2. Output Power Programming

The RF output power from the device is

programmable by the 8-bit PA_POWER

register. Figure 23 and Figure 24 shows

the output power and total current

consumption

as

a

function

of

the

PA_POWER register setting. It is more

efficient in terms of current consumption to

use either the lower or upper 4-bits in the

register to control the power, as shown in

the figures. However, the output power

can be controlled in finer steps using all

the available bits in the PA_POWER

register.

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