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SX1240
Integrated Transmitter IC
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
2.4. Electrical Specifications
The table below gives the electrical specifications of the transmitter under the following conditions: Supply voltage = 3.3 V,
temperature = 25 °C, f XOSC = 26 MHz, f RF = 433.93 MHz, 2-level FSK modulation Df = 20 kHz, bit rate = 10 kbit/s and
output power = +10 dBm terminated in a matched 50 ohm impedance, unless otherwise specified.
Table 4
Transmitter Specifications
Symbol
Description
Conditions
Min
Typ
Max
Unit
Current Consumption
IDDSL
Supply current in sleep mode
-
0.5
1
μA
IDDT
Supply current in transmit mode
with appropriate external match-
RF Power o/p = +10 dBm
RF Power o/p = 0 dBm
-
-
16.5
9
-
-
mA
mA
ing.
RF and Baseband Specifications
FDA_D
Frequency deviation, FSK
Number of programmable values
-
8
-
FDA
Frequency deviation, FSK*
10
-
100
kHz
BRF
BRO
OOK_B
RFOP
DRFOPV
Bit rate, FSK
Bit rate, OOK
OOK Modulation Depth
RF output power in 50 ohms
Variation in RF output power with
supply voltage
Permissible Range
Permissible Range
High Power Setting
Low Power Setting**
2.5 V to 3.3 V
1.8 V to 3.7 V
0.5
0.5
-
7
-3
-
-
-
-
50
10
0
-
-
100
10
-
-
-
3
7
kbps
kbps
dB
dBm
dBm
dB
dB
PHN
Transmitter phase noise at
Offset from centre frequency:
FR
868.3 MHz
Number of selectable Frequencies
100 kHz
350 kHz
550 kHz
1.15 MHz
-
-
-
-
-
-
-
-
-
8
-76
-81
-91
-101
-
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
FXOSC
Crystal Oscillator Frequency
26
26
26
MHz
STEP
DFXOSC
RF Frequency Step
Frequency Variation of the Oscilla-
No crystal contribution
868 MHz
434 MHz
-
-
-
3.174
1.587
-
-
-
+/-25
kHz
kHz
ppm
tor Circuit
Timing Specifications
TS_TR
Time from Sleep to Tx mode
-
-
2
ms
TOFFT
RAMP
Timer from Tx data activity to
Sleep
PA Ramp up and down time
Programmable
****
-
-
-
2
20
20
-
-
-
ms
ms
us
SX1240, Rev 1, Oct 2010
?2010 Semtech Corp.
Page 6
www.semtech.com
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