SPIRIT1 datasheet(51/94 Pages) STMICROELECTRONICS

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SPIRIT1

Transmission and reception

Doc ID 022758 Rev 3

51/94

power ramp decreasing from PA_POWER[PA_LEVEL_MAX_INDEX] to PA_POWER[0]. The

duration of each power step is 1/8 of the symbol time.

If more '1's are transmitted consecutively, the PA power remains at

PA_POWER[PA_LEVEL_MAX_INDEX] for all '1's following the first one; If more '0's are

transmitted consecutively, the PA power remains at PA_POWER[0] for all '0's following the

first one.

CW mode

For test and measurement purposes the device can be programmed to generate a

continuous wave carrier without any modulation by setting the CW field of the MOD0

READY mode.

9.5.1

Data rate

The data rate is controlled by the MOD0 and MOD1 registers according to the following

formula:

Equation 10

where:

●

DATARATE_M is an 8-bit integer ranging from 0 to 255

●

DATARATE_E is a 4-bit integer ranging from 0 to 15

●

fclk is the digital clock frequency (typically 26 MHz).

The minimum data rate at fclk = 26 MHz is about 25 Hz; the maximum data rate is about 1.6

MHz. Be advised that performance for such values is not guaranteed.

9.5.2

RX channel bandwidth

The bandwidth of the channel filter is controlled by the CHFLT_M and CHFLT_E fields of the

CHFLT register according to tables below. The actual filter bandwidth for any digital clock

frequency can be obtained by multiplying the values in the tables below by the factor

fclk/26000000.

DataRate

clk

256

DATA_RATE_M

() 2

DATARATE_E

⋅

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

⋅

Table 28.

CHFLT_M and CHFLT_E value for channel filter bandwidth (in kHz, for fclk = 24 MHz)

E=0

E=1

E=2

E=3

E=4

E=5

E=6

E=7

E=8

E=9

M=0

738.6

416.2

207.4

103.7

51.8

25.8

12.9

6.5

3.2

1.7

M=1

733.9

393.1

196.1

98.0

48.9

24.5

12.3

6.1

3.0

1.6

M=2

709.3

372.2

185.6

92.8

46.3

23.2

11.6

5.8

2.9

1.5

M=3

680.1

351.5

175.4

87.7

43.8

21.9

11.0

5.4

2.8

1.4

M=4

650.9

334.2

166.8

83.4

41.6

20.9

10.4

5.2

2.6

1.3

M=5

619.3

315.4

157.5

78.7

39.3

19.7

9.8

4.9

2.5

1.2

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