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SX1235 Datasheet(PDF) 28 Page - Semtech Corporation |
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SX1235 Datasheet(HTML) 28 Page - Semtech Corporation |
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28 / 104 page  www.semtech.com Page 28 SX1235 WIRELESS & SENSING DATASHEET Rev 1 - December 2012 Table 11 Bit Rate Examples 3.4.3. FSK Modulation FSK modulation is performed inside the PLL bandwidth, by changing the fractional divider ratio in the feedback loop of the PLL. The large resolution of the sigma-delta modulator, allows for very narrow frequency deviation. The frequency deviation FDEV is given by: To ensure a proper modulation, the following limit applies: Note no constraint applies to the modulation index of the transmitter, but the frequency deviation must be set between 600 Hz and 200 kHz. 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 1.2 kbps 1200.015 0x34 0x15 2.4 kbps 2.4 kbps 2400.060 0x1A 0x0B 4.8 kbps 4.8 kbps 4799.760 0x0D 0x05 9.6 kbps 9.6 kbps 9600.960 0x06 0x83 19.2 kbps 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 12.5 kbps 12500.00 0x05 0x00 25 kbps 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 32.768 kbps 32753.32 FDEV FSTEP Fdev 13 0 (, ) × = FDEV BR 2 ------- 250 ()kHz ≤ + |
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