SPIRIT1 datasheet(49/94 Pages) STMICROELECTRONICS

49 / 94 page

SPIRIT1

Transmission and reception

Doc ID 022758 Rev 3

49/94

The recommended IF value is about 480 kHz resulting in the following register setting:

9.5

Modulation scheme

The following modulation formats are supported: 2-FSK, GFSK, MSK, OOK, and ASK. The

actual modulation format used is controlled by the MOD_TYPE field of the MOD0 register:

●

MOD_TYPE =

–

0 (00): 2-FSK

–

1 (01): GFSK

–

2 (10): ASK/OOK

–

3 (11): MSK

In 2-FSK and GFSK modes, the frequency deviation is controlled by the FDEV register

according to the following formula:

Equation 9

where:

●

fXO is the XTAL oscillator frequency (typically 26 MHz or 52 MHz).

●

FDEV_M is a 3-bit integer ranging from 0 to 7

●

FDEV_E is a 4-bit integer ranging from 0 to 9.

The fdev values obtainable are then:

For fXO = 52 MHz

Table 27.

IF_OFFSET settings

IF_OFFSET_ANA

IF_OFFSET_DIG

fIF [kHz]

fXO [MHz]

0xB6

480.469

0xAC

480.143

0xA3

480.306

0x3B

0xB6

480.469

0x36

0xAC

480.143

0x31

0xA3

480.140

dev

floor 8

(

FDEV_M

)

FDEV_E

–

)

⋅

-----------------------------------------------------------------------------------------------

E/M

793.5

991.8

1190.2

1388.5

1586.9

1785.3

1983.6

2182.0

2380.4

2578.7

2777.1

2975.5

3173.8

3570.6

3967.3

4364.0

4760.7

5157.5

5554.2

5950.9

6347.7

7141.1

7934.6

8728.0

9521.5

10314.9

11108.4

11901.9

12695.3

14282.2

15869.1

17456.1

19043.0

20629.9

22216.8

23803.7

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