SX1231-31SKB915 Semtech, SX1231-31SKB915 Datasheet - Page 20

• Manufacturer Part Number: SX1231-31SKB915
• Description: TVS
• Manufacturer: Semtech

Specifications of SX1231-31SKB915

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 9
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
3.4.4. OOK Modulation
OOK modulation is applied by switching on and off the Power Amplifier. Digital control and smoothing are available to
improve the transient power response of the OOK transmitter.
Rev 3 - April 2010
ADVANCED COMMUNICATIONS & SENSING
Classical modem baud rates
(multiples of 1.2 kbps)
Classical modem baud rates
(multiples of 0.9 kbps)
Round bit rates
(multiples of 12.5, 25 and
50 kbps)
Watch Xtal frequency
no constraint applies to the modulation index of the transmitter, but the frequency deviation must exceed 600 Hz.
Bit Rate Examples
Type
BitRate
(15:8)
0x0D
0x1A
0x0A
0x03
0x68
0x34
0x06
0x03
0x01
0x00
0x02
0x01
0x05
0x02
0x01
0x00
0x00
0x00
0x00
BitRate
F
0xD0
0x2C
0xD5
0xD1
0x2B
0x15
0x0B
0x05
0x83
0x41
0xA1
0x16
0x00
0x00
0x80
0x40
0xA0
0x80
0x6B
(7:0)
DEV
F
DEV
=
+
Page 20
F
BR
------ -
STEP
2
≤
×
500kHz
32.768 kbps
153.6 kbps
115.2 kbps
19.2 kbps
38.4 kbps
76.8 kbps
57.6 kbps
12.5 kbps
Fdev 13 0
100 kbps
150 kbps
200 kbps
250 kbps
300 kbps
(G)MSK
1.2 kbps
2.4 kbps
4.8 kbps
9.6 kbps
(G)FSK
25 kbps
50 kbps
( , )
32.768 kbps
19.2 kbps
12.5 kbps
1.2 kbps
2.4 kbps
4.8 kbps
9.6 kbps
25 kbps
OOK
Actual BR
1200.015
2400.060
4799.760
9600.960
19196.16
38415.36
76738.60
153846.1
57553.95
115107.9
12500.00
25000.00
50000.00
100000.0
150234.7
200000.0
250000.0
299065.4
32753.32
DATASHEET
www.semtech.com
SX1231
(b/s)