RF96 datasheet(42/121 Pages) HOPE

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Page 42

RF96/97/98

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WIRELESS & SENSING

PRELIMINARY

DATASHEET

Table 64 Bit Rate Examples

Type

BitRate

(15:8)

BitRate

(7:0)

(G)FSK

(G)MSK

OOK

Actual BR

(b/s)

Classical modem baud rates

(multiples of 1.2 kbps)

0x68

0x2B

1.2 kbps

1200.015

0x34

0x15

2.4 kbps

2400.060

0x1A

0x0B

4.8 kbps

4799.760

0x0D

0x05

9.6 kbps

9600.960

0x06

0x83

19.2 kbps

19196.16

0x03

0x41

38.4 kbps

38415.36

0x01

0xA1

76.8 kbps

76738.60

0x00

0xD0

153.6 kbps

153846.1

Classical modem baud rates

(multiples of 0.9 kbps)

0x02

0x2C

57.6 kbps

57553.95

0x01

0x16

115.2 kbps

115107.9

Round bit rates

(multiples of 12.5, 25 and

50 kbps)

0x0A

0x00

12.5 kbps

12500.00

0x05

0x00

25 kbps

25000.00

0x80

0x00

50 kbps

50000.00

0x01

0x40

100 kbps

100000.0

0x00

0xD5

150 kbps

150234.7

0x00

0xA0

200 kbps

200000.0

0x00

0x80

250 kbps

250000.0

0x00

0x6B

300 kbps

299065.4

Watch Xtal frequency

0x03

0xD1

32.768 kbps

32753.32

4.2.2. FSK/OOK Transmission

4.2.2.1. FSK Modulation

FSK modulation is performed inside the PLL bandwidth, by changing the fractional divider ratio in the feedback loop of the

PLL. The high resolution of the sigma-delta modulator, allows for very narrow frequency deviation. The frequency deviation

FDEV is given by:

DEV = FSTE P

× Fdev(13,0)

To ensure correct modulation, the following limit applies:

D E V + -----

≤ (250)kHz

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