SX1231 데이터 시트보기 (PDF) - Semtech Corporation
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SX1231 Datasheet PDF : 81 Pages
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ADVANCED COMMUNICATIONS & SENSING
FRC
BRF
BRO
FDA
RC Oscillator frequency
Bit rate, FSK
Bit rate, OOK
Frequency deviation, FSK
After calibration
Programmable
Programmable
Programmable
FDA + BRF/2 =< 500 kHz
SX1231
DATASHEET
-
62.5
-
kHz
1.2
-
300 kbps
1.2
-
32.768 kbps
0.6
-
300 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
Conditions
Min
FSK sensitivity, highest LNA gain 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 *
-
OOK sensitivity, highest LNA gain BR = 4.8 kb/s
-
Co-Channel Rejection
-13
Adjacent Channel Rejection
Offset = +/- 25 kHz -
Offset = +/- 50 kHz 37
Blocking Immunity
Offset = +/- 1 MHz -
Offset = +/- 2 MHz -
Offset = +/- 10 MHz -
Blocking Immunity
Wanted signal at sensitivity
+16dB
Offset = +/- 1 MHz -
Offset = +/- 2 MHz -
Offset = +/- 10 MHz -
AM Rejection , AM modulated
interferer with 100% modulation
depth, fm = 1 kHz, square
Offset = +/- 1 MHz -
Offset = +/- 2 MHz -
Offset = +/- 10 MHz -
2nd order Input Intercept Point
Unwanted tones are 20 MHz
above the LO
Lowest LNA gain -
Highest LNA gain -
3rd order Input Intercept point
Unwanted tones are 1MHz and
1.995 MHz above the LO
Lowest LNA gain -
Highest LNA gain -23
Typ
-118
-114
-105
Max Unit
- dBm
- dBm
- dBm
-120
- dBm
-112 -109 dBm
-10
- dB
42
- dB
42
- dB
-45
- dBm
-40
- dBm
-32
- dBm
-36
- dBm
-33
- dBm
-25
- dBm
-45
- dBm
-40
- dBm
-32
- dBm
+75
- dBm
+35
- dBm
+20
- dBm
-18
- dBm
Single Side channel filter BW
Programmable
2.6
-
500 kHz
Rev 3 - April 2010
Page 13
www.semtech.com
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