SX1240ISTRT Semtech, SX1240ISTRT Datasheet - Page 6

• Manufacturer Part Number: SX1240ISTRT
• Description: IC, RF/IF TRANSMITTER, 868.3MHz, SOIC-8
• Manufacturer: Semtech

Specifications of SX1240ISTRT

• Transmitting Current: 16.5mA
• Data Rate: 100Kbps
• Modulation Type: FSK, OOK
• Rf Ic Case Style: SOIC
• No. Of Pins: 8
• Supply Voltage Range: 1.8V To 3.7V
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: Yes

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