CC1100-RTY1 datasheet(36/100 Pages) TI1

36 / 100 page

CC1100

SWRS038D

Page 36 of 92

Modulation Formats

CC1100 supports amplitude, frequency, and

phase shift modulation formats. The desired

modulation

format

set

the

MDMCFG2.MOD_FORMAT

Optionally, the data stream can be Manchester

coded by the modulator and decoded by the

demodulator. This option is enabled by setting

MDMCFG2.MANCHESTER_EN=1

Manchester

encoding is not supported at the same time as

using the FEC/Interleaver option.

16.1 Frequency Shift Keying

2-FSK can optionally be shaped by a

Gaussian filter with BT = 1, producing a GFSK

modulated signal.

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:

DEVIATION

xosc

dev

DEVIATION

)

(

⋅

The symbol encoding is shown in Table 23.

Format

Symbol

Coding

2-FSK/GFSK

‘0’

– Deviation

‘1’

+ Deviation

Table 23: Symbol Encoding for 2-FSK/GFSK

Modulation

16.2 Minimum Shift Keying

When using MSK

1, 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

equivalent to changing the shaping of the

symbol.

The MSK modulation format implemented in

CC1100 inverts the sync word and data

compared to e.g. signal generators.

16.3 Amplitude Modulation

CC1100 supports two different forms of

amplitude modulation: On-Off Keying (OOK)

and Amplitude Shift Keying (ASK).

OOK modulation simply turns on or off the PA

to modulate 1 and 0 respectively.

The ASK variant supported by the

CC1100

allows programming of the modulation depth

(the difference between 1 and 0), and shaping

of the pulse amplitude. Pulse shaping will

produce a more bandwidth constrained output

spectrum. Note that the pulse shaping feature

on the

CC1100 does only support output power

up to about -1dBm. The PATABLE settings that

can be used for pulse shaping are 0x00 and

0x30 to 0x3F.

Identical to offset QPSK with half-sine

shaping (data coding may differ)

CC1100-RTY1 Datasheet(PDF) 36 Page - Texas Instruments

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