CC1021-RTR1 datasheet(44/92 Pages) TI

No. de pieza	CC1021-RTR1

Descripción Electrónicos	Single Chip Low Power RF Transceiver for Narrowband Systems

PDF	92 Pages

Scroll/Zoom	100%

Fabricante Electrónico	TI [Texas Instruments]

Página de inicio	http://www.ti.com

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44 / 92 page

CC1021

SWRS045

Page 44 of 91

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

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

the figures. However, the output power

can be controlled in finer steps using all

the available bits in the PA_POWER

CC1021-RTR1 Datasheet(PDF) 44 Page - Texas Instruments