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SX1231
WIRELESS & SENSING PRODUCTS
DATASHEET
FRC
BRF
BRO
FDA
RC Oscillator frequency
Bit rate, FSK
Bit rate, OOK
Frequency deviation, FSK
After calibration
Programmable
Programmable
Programmable
-
1.2
1.2
0.6
62.5
-
-
-
-
300
32.768
300
kHz
kbps
kbps
kHz
FDA + BRF/2 =< 500 kHz
2.4.3. Receiver
All receiver tests are performed with RxBw = 10 kHz (Single Side Bandwidth) as programmed in RegRxBw , receiving a
PN15 sequence with a BER of 0.1% (Bit Synchronizer is enabled), unless otherwise specified. The LNA impedance is set
to 200 Ohms, by setting bit LnaZin in RegLna to 1. Blocking tests are performed with an unmodulated interferer. The
wanted signal power for the Blocking Immunity, ACR, IIP2, IIP3 and AMR tests is set 3 dB above the nominal sensitivity
level.
Table 6
Receiver Specification
Symbol
RFS_F
RFS_O
CCR
ACR
BI
AMR
IIP2
IIP3
BW_SSB
Description
FSK sensitivity, highest LNA gain
OOK sensitivity, highest LNA gain
Co-Channel Rejection
Adjacent Channel Rejection
Blocking Immunity
Blocking Immunity
Wanted signal at sensitivity
+16dB
AM Rejection, AM modulated
interferer with 100% modulation
depth, fm = 1 kHz, square
2nd order Input Intercept Point
Unwanted tones are 20 MHz
above the LO
3rd order Input Intercept point
Unwanted tones are 1MHz and
1.995 MHz above the LO
Single Side channel filter BW
Conditions
FDA = 5 kHz, BR = 1.2 kb/s
FDA = 5 kHz, BR = 4.8 kb/s
FDA = 40 kHz, BR = 38.4 kb/s
FDA = 5 kHz, BR = 1.2 kb/s *
BR = 4.8 kb/s
Offset = +/- 25 kHz
Offset = +/- 50 kHz
Offset = +/- 1 MHz
Offset = +/- 2 MHz
Offset = +/- 10 MHz
Offset = +/- 1 MHz
Offset = +/- 2 MHz
Offset = +/- 10 MHz
Offset = +/- 1 MHz
Offset = +/- 2 MHz
Offset = +/- 10 MHz
Lowest LNA gain
Highest LNA gain
Lowest LNA gain
Highest LNA gain
Programmable
Min
-
-
-
-
-
-13
-
37
-
-
-
-
-
-
-
-
-
-
-
-
-23
2.6
Typ
-118
-114
-105
-120
-112
-10
42
42
66
71
79
62
65
73
66
71
79
+75
+35
+20
-18
-
Max
-
-
-
-
-109
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
500
Unit
dBm
dBm
dBm
dBm
dBm
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dBm
dBm
dBm
dBm
kHz
Rev. 7 - June 2013
Page 15
www.semtech.com
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