SX1231 SEMTECH [Semtech Corporation], SX1231 Datasheet - Page 13

• Manufacturer Part Number: SX1231
• Description: Low Power Integrated UHF Transceiver
• Manufacturer: SEMTECH [Semtech Corporation]

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, and the AdcLowPowerOn in RegTemp is set 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
Rev 2 - Nov 2009
ADVANCED COMMUNICATIONS & SENSING
FRC
BRF
BRO
FDA
Symbol
RFS_F
RFS_O
CCR
ACR
BI
AMR
IIP2
IIP3
BW_SSB
Receiver Specification
RC Oscillator frequency
Bit rate, FSK
Bit rate, OOK
Frequency deviation, FSK
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
After calibration
Programmable
Programmable
Programmable
FDA + BRF/2 =< 500 kHz
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
Programmable
Page 13
Offset = +/- 10 MHz
Offset = +/- 10 MHz
Offset = +/- 10 MHz
Offset = +/- 25 kHz
Offset = +/- 50 kHz
Offset = +/- 1 MHz
Offset = +/- 2 MHz
Offset = +/- 1 MHz
Offset = +/- 2 MHz
Offset = +/- 1 MHz
Offset = +/- 2 MHz
Highest LNA gain
Highest LNA gain
Lowest LNA gain
Lowest LNA gain
1.2
0.6
1.2
-
Min
-13
-23
2.6
37
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
62.5
-
-
-
-105
-120
-118
-114
-112
Typ
+75
+35
+20
-10
-45
-40
-32
-36
-33
-25
-45
-40
-32
-18
42
42
-
32.768
DATASHEET
300
300
www.semtech.com
SX1231
-109
Max
-
500
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
kHz
kbps
kbps
kHz
dBm
dBm
dBm
dBm
dBm
dB
dB
dB
dBm
dBm
dBm
dBm
dBm
dBm
dB
dB
dB
dBm
dBm
dBm
dBm
kHz
Unit