CC1150-RTY1 datasheet(23/67 Pages) TI1

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DEVIATION _ E

xosc

dev

(8 DEVIATION _ M) 2

CC1150

www.ti.com

SWRS037B – JANUARY 2006 – REVISED MARCH 2015

–

It is recommended to employ an interrupt driven solution due to that when using SPI polling, there

is a small, but finite, probability that a single read from registers PKTSTATUS and TXBYTES is

being corrupt. The same is the case when reading the chip status byte. This is explained in the

CC1150 Errata Notes [8] Refer to the TI website for SW examples [12].

5.9

Modulation Formats

CC1150 supports amplitude, frequency and phase shift modulation formats. The desired modulation

format is set in the MDMCFG2.MOD_FORMAT register.

Optionally, the data stream can be Manchester coded by the modulator. This option is enabled by setting

MDMCFG2.MANCHESTER_EN=1. Manchester encoding cuts the effective data rate in half, and thus

Manchester is not supported for 500 kBaud. Further note that Manchester encoding is not supported at

the same time as using the FEC/Interleaver option or when using MSK modulation.

5.9.1

Frequency Shift Keying

CC1150 has the possibility to use Gaussian shaped 2_FSK (GFSK). The 2-FSK signal is then shaped by

a Gaussian filter with BT=1, producing a GFSK modulated signal. This spectrum-shaping feature improves

adjacent channel power (ACP) and occupied bandwidth.

In “true” 2-FSK systems with abrupt frequency shifting, the spectrum is inherently broad. By making the

frequency shift “softer”, the spectrum can be made significantly narrower. Thus, higher data rates can be

transmitted in the same bandwidth using GFSK.

The frequency deviation is programmed with the DEVIATION_M and DEVIATION_E values in the

DEVIATN register. The value has an exponent/mantissa form, and the resultant deviation is given by

Equation 3.

(3)

The symbol encoding is shown in Table 5-5.

Table 5-5. Symbol Encoding for 2-FSK/GFSK

Modulation

FORMAT

SYMBOL

CODING

– Deviation

2-FSK/GFSK

+ Deviation

5.9.2

Minimum Shift Keying

When using MSK [(Identical to offset QPSK with half-sine shaping (data coding may differ)], the complete

transmission (preamble, sync word, and payload) will be MSK modulated.

Phase shifts are performed with a constant transition time. The fraction of a symbol period used to change

the phase can be modified with the DEVIATN.DEVIATION_M setting. This is equivalent to changing the

shaping of the symbol.

NOTE

When

using

MSK,

Manchester

encoding

must

disabled

setting

MDMCFG2.MANCHESTER_EN=0.

The MSK modulation format implemented in CC1150 inverts the data compared to,

for example, signal generators.

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