SX1239 データシートの表示（PDF） - Semtech Corporation
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SX1239 Datasheet PDF : 73 Pages
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SX1239
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
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
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
-120
-112
-10
42
42
-45
-40
-32
-36
-33
-25
-45
-40
-32
+75
+35
+20
-18
Max Unit
- dBm
- dBm
- dBm
- dBm
-109 dBm
- dB
- dB
- dB
- dBm
- dBm
- dBm
- dBm
- dBm
- dBm
- dBm
- dBm
- dBm
- dBm
- dBm
- dBm
- dBm
BW_SSB
Single Side channel filter BW
Programmable
IMR_OOK
Image rejection in OOK mode
Wanted signal level = -106 dBm
TS_RE
Receiver wake-up time, from PLL RxBw = 10 kHz, BR = 4.8 kb/s
locked state to RxReady
RxBw = 200 kHz, BR = 100 kb/s
TS_RE_AGC Receiver wake-up time, from PLL RxBw= 10 kHz, BR = 4.8 kb/s
locked state, AGC enabled
RxBw = 200 kHz, BR = 100 kb/s
TS_RE_AGC Receiver wake-up time, from PLL RxBw= 10 kHz, BR = 4.8 kb/s
&AFC
lock state, AGC and AFC enabled RxBw = 200 kHz, BR = 100 kb/s
2.6
-
500 kHz
27
30
- dB
-
1.7
- ms
-
96
- us
-
3.0
ms
163
us
4.8
ms
265
us
Rev 3 - Jan 2011
Page 13
www.semtech.com
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