CC115LRGPR datasheet(42/74 Pages) TI2

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CC115L

SWRS105B – MAY 2011 – REVISED JUNE 2014

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5.18.3 Wideband Modulation when not Using Spread Spectrum

Digital modulation systems under FCC Section 15.247 include 2-FSK, GFSK, and 4-FSK modulation. A

maximum peak output power of 1 W (+30 dBm) is allowed if the 6 dB bandwidth of the modulated signal

exceeds 500 kHz. In addition, the peak power spectral density conducted to the antenna shall not be

greater than +8 dBm in any 3 kHz band.

Operating at high data rates and frequency separation, the CC115L is suited for systems targeting

compliance with digital modulation system as defined by FCC Section 15.247. An external power amplifier

such as CC1190 SWRS089 is needed to increase the output above +11 dBm. Refer to DN006 SWRA123

for further details concerning wideband modulation and CC115L.

5.18.4 Data Burst Transmissions

The high maximum data rate of CC115L opens up for burst transmissions. A low average data rate link

(e.g. 10 kBaud) can be realized by using a higher over-the-air data rate. Buffering the data and

transmitting in bursts at high data rate (e.g. 500 kBaud) will reduce the time in TX mode, and hence also

reduce the average current consumption significantly. Reducing the time in TX mode will reduce the

likelihood of collisions with other systems in the same frequency range.

5.18.5 Continuous Transmissions

In data streaming applications, the CC115L opens up for continuous transmissions at 500 kBaud effective

data rate. As the modulation is done with a closed loop PLL, there is no limitation in the length of a

transmission (open loop modulation used in some radios often prevents this kind of continuous data

streaming and reduces the effective data rate).

5.18.6 Increasing Output Power

The PA portion of the CC1190 SWRS089 can be used together with CC115L in applications where

increased output power is needed.

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CC115LRGPR Datasheet(PDF) 42 Page - Texas Instruments