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S2-LPTXQTR 데이터시트(PDF) 21 Page - STMicroelectronics

부품명 S2-LPTXQTR
상세설명  Sub-1 GHz proprietary radio transmitter
PDF  64 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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4.4.1
Frequency modulation
For frequency modulation 2-(G)FSK and 4-(G)FSK the frequency deviation can be tuned in wide range that
depends on
fxo(XTALfrequency)accordingthefollowingformula:
Frequency deviation
fdev=
fXO219·roundD·FDEV_M·B8
D·B                                           if FDEV_E=0
fXO219·roundD·256+FDEV_M·2FDEV_E−1·B8
D·B
     if FDEV_E >0  
(10)
Where
fxoistheXTALoscillationfrequency,DisthereferencedividerandBisthebandselector.
The frequency deviation programmed corresponds to the deviation of the outer constellation symbols. The
deviation of the inner symbols is 1/3 of such programmed values, as reported in the table below, where 4 options
are available.
Furthermore, since the payload is normally arranged in bytes, the arrangement can change the mapping for both
2-(G)FSK and 4-(G)FSK modulations, by using the CONST_MAP (register MOD1), in the following way:
Table 29. Constellation mapping 2-(G)FSK
Format
Symbol
CONST_MAP coding
0
1
2
3
2-(G)FSK
0
-FDEV
NA
+FDEV
NA
1
+FDEV
NA
-FDEV
NA
Table 30. Constellation mapping 4-(G)FSK
Format
Symbol
CONST_MAP coding
0
1
2
3
4-(G)FSK
00
-FDEV/3
-FDEV
+FDEV/3
+FDEV
01
-FDEV
-FDEV/3
+FDEV
+FDEV/3
10
+FDEV/3
+FDEV
-FDEV/3
-FDEV
11
+FDEV
+FDEV/3
-FDEV
-FDEV/3
Furthermore, in the 4-(G)FSK it is also possible to swap the symbols using the 4FSK_SYM_SWAP field (register
PCKTCTRL3) as follows:
(11)
When 4FSK_SYM_SWAP = 0: S0 = <b7b6>
S1 = <b5b4>
S2 = <b3b2>
S3 = <b1b0>
When 4FSK_SYM_SWAP = 1 S0 = <b6b7>
S1 = <b4b5>
S2 = <b2b3>
S3 = <b0b1>
4.4.1.1
Gaussian shaping
In 2-GFSK or 4-GFSK mode, the Gaussian filter BT product can be set by using the register BT_SEL to 1 or 0.5.
The Gaussian filtering is implemented by poly-phase filtering with eight taps per symbol time. In order to further
smooth the filter shape and improve spectral shaping, the output of the filter can be linearly interpolated by setting
the register MOD_INTERP_EN.
S2-LPTX
Digital modulator
DS13100 - Rev 1
page 21/64



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