Physical layer

ST7580

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DocID022644 Rev 2

Figure 12. Frequency deviation

The following equation shows the frequency deviation formula for ST7580 FSK modulation:

Equation 4 Frequency deviation formula

The deviation factor is a configurable parameter: admitted values are 1 or 0.5. Table 12

summarizes the frequency deviation for all symbol rate and deviation factors.

Table 12. Frequency deviation possible values

Symbol rate [baud]

Deviation factor

10.5

1200

0.6 kHz

0.3 kHz

2400

1.2 kHz

0.6 kHz

4800

2.4 kHz

1.2 kHz

9600

4.8 kHz

2.4 kHz



Hz

factor

_

deviation

*

2

rate

_

symbol

f



