S2-LP datasheet(31/90 Pages) STMICROELECTRONICS

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S2-LP

Block description

DocID029944 Rev 1

31/90

Table 36: Channel spacing resolution

fxo [MHz]

Channel spacing resolution [Hz]

732.42

762.94

793.45

1464.84

1525.88

1586.91

5.4

Digital modulator

The S2-LP supports frequency modulation: 2-FSK, 4-FSK, 2-GFSK, 4-GFSK as well

amplitude modulation OOK and ASK. Using register, the user can also program an

unmodulated carrier for lab test and measurement. A special mode, Direct Polar

Modulation, allows building specific modulation scheme controlling directly the amplitude

and the frequency of the carrier synthesized. The register MOD_TYPE is used to select

one of the following modulation scheme.

Table 37: Modulation scheme

MOD_TYPE

Modulation scheme

000b

2-FSK

001b

4-FSK

010b

2-GFSK

011b

4-GFSK

101b

ASK/OOK

110b

Direct Polar (TX)

111b

5.4.1

Frequency modulation

For frequency modulation 2-(G)FSK and 4-(G)FSK the frequency deviation can be tuned in

wide range that depends on

�� (XTAL frequency) according the following formula:

Equation 7

– Frequency deviation

�� =

{

��

219

��(�� · �� · �� 8

⁄ )

�� · ��

��_�� = 0

��

219

��(�� · (256 + ��_��) · 2(��−1) · �� 8

⁄ )

�� · ��

��_�� > 0

Where

�� is the XTAL oscillation frequency, D is the reference divider and B is the band

selector.

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 where 4 options are available.

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