Datasheet

www.semtech.comPage 18
SX1272/73
WIRELESS, SENSING & TIMING DATASHEET
Rev. 2 - July 2014
©2014 Semtech Corporation
2.5.5. Electrical specification for LoRa
TM
modulation
The table below gives the electrical specifications for the transceiver operating with Lora
TM
modulation. Following
conditions apply unless otherwise specified:
 Supply voltage = 3.3 V.
 Temperature = 25° C.
 f
XOSC
= 32 MHz.
 Band: f
RF
= 915 MHz.
 bandwidth (BW) = 125 kHz.
 Spreading Factor (SF) = 12.
 Error Correction Code (EC) = 4/6.
 Packet Error Rate (PER)= 1%
 CRC on payload enabled.
 Output power = 13 dBm in transmission.
 Payload length = 10 bytes.
 Preamble Length = 12 symbols (programmed register PreambleLength=8)
 With matched impedances
ACP
Transmitter adjacent channel
power (measured at 25 kHz offset)
BT = 1. Measurement conditions as
defined by EN 300 220-1 V2.3.1
- - -37 dBm
TS_TR
Transmitter wake up time, to the
first rising edge of DCLK
Frequency Synthesizer enabled,
PaRamp = 10 us, BR = 4.8 kbps
- 120 - us
Symbol Description Conditions Min. Typ Max Unit
IDDR_L
Supply current in receiver
LoRa
TM
mode
LnaBoost Off, BW = 125 kHz
LnaBoost Off, BW = 250 kHz
LnaBoost Off, BW = 500 kHz
-
-
-
9.7
10.5
12
-
-
-
mA
mA
mA
LnaBoost On, BW = 125 kHz
LnaBoost On, BW = 250 kHz
LnaBoost On, BW = 500 kHz
-
-
-
10.8
11.6
13
-
-
-
mA
mA
mA
IDDT_L
Supply current in transmitter mode
RFOP = 13 dBm
RFOP = 7 dBm
-
-
28
18
-
-
mA
mA
IDDT_H_L
Supply current in transmitter mode
with an external impedance
transformation
Using PA_BOOST pin
RFOP = 17 dBm
-90-mA
BI_L
Blocking immunity, FRF=868 MHz
CW interferer
offset = +/- 1 MHz
offset = +/- 2 MHz
offset = +/- 10 MHz
-
82.5
86.5
89
dB
dB
dB
IIP3_L
3rd order input intercept point,
highest LNA gain, FRF=868 MHz,
CW interferer
F1 = FRF + 1 MHz
F2 = FRF + 1.995 MHz
- -12.5 - dBm
Table 10 Electrical specifications: Lora
TM
mode