Data Sheet

LJ1269HC
Rev1.0 Page 12 Web: www.ljelect.com
FSTEP
Frequency synthesizer step
FSTEP = FXOSC/2
19
-
61.0
-
Hz
FRC
RC Oscillator frequency
After calibration
-
62.5
-
kHz
BRF
Bit rate, FSK
Programmable
1.2
-
300
kbps
BRO
Bit rate, OOK
Programmable
1.2
-
32.768
kbps
FDA
Frequency deviation, FSK
Programmable
FDA + BRF/2 =< 500 kHz
0.6
-
300
kHz
2.3.3.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
Description
Conditions
Min
Typ
Max
Unit
RFS_F
FSK sensitivity, highest LNA gain
FDA = 5 kHz, BR = 1.2 kb/s
FDA = 5 kHz, BR = 4.8 kb/s
FDA = 5 kHz, BR = 4.8 kb/s
-
-
-
-118
-114
-105
-
-
-
dBm
dBm
dBm
FDA = 5 kHz, BR = 1.2 kb/s
*
-
-120
-
dBm
RFS_O
OOK sensitivity, highest LNA gain
BR = 4.8 kb/s
-
-112
-109
dBm
CCR
Co-Channel Rejection
-13
-10
-
dB
ACR
Adjacent Channel Rejection
Offset = +/- 25 kHz
Offset = +/- 50 kHz
-
37
42
42
-
-
dB
dB
BI
Blocking Immunity
Offset = +/- 1 MHz
Offset = +/- 2 MHz
Offset = +/- 10 MHz
-
-
-
66
71
79
-
-
-
dB
dB
dB
Blocking Immunity Wanted signal at
sensitivity +16dB
Offset = +/- 1 MHz
Offset = +/- 2 MHz
Offset = +/- 10 MHz
-
-
-
62
65
73
-
-
-
dB
dB
dB
AMR
AM Rejection , AM modulated
interferer with 100% modulation
depth, fm = 1 kHz, square
Offset = +/- 1 MHz
Offset = +/- 2 MHz
Offset = +/- 10 MHz
-
-
-
66
71
79
-
-
-
dB
dB
dB
IIP2
2nd order Input Intercept Point
Unwanted tones are 20 MHz above
the LO
Lowest LNA gain
Highest LNA gain
-
-
+75
+35
-
-
dBm
dBm
Sub GHz FSK/OOK Transceiver Module DATASHEET