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SX1240 Schematic ( PDF Datasheet ) - Semtech

Teilenummer SX1240
Beschreibung Low Cost Integrated Transmitter IC
Hersteller Semtech
Logo Semtech Logo 




Gesamt 20 Seiten
SX1240 Datasheet, Funktion
SX1240
ADVANCED COMMUNICATIONS & SENSING
SX1240 - Low Cost Integrated Transmitter IC
434 MHz and 868 MHz Band RF Transmitter
DATASHEET
GENERAL DESCRIPTION
The SX1240 is an ultra-low-cost, fully integrated FSK or
OOK compatible transmitter suitable for operation in the
418, 434 and 868 MHz licence free ISM bands.
For applications where economy is paramount, the SX1240
may be used without the requirement for configuration via
an MCU. The transmitter is configured for default operation
at a frequency of 433.92 MHz or 868.3 MHz. However, in
conjunction with a microcontroller the communication link
parameters may be re-configured. Including, output power,
modulation format and operating channel.
The SX1240 offers integrated radio performance with cost
efficiency and is suited for worldwide operations in
particular Europe (ETSI EN 300-220-1), North America
(FCC part 15.231).
ORDERING INFORMATION
Part Number Temperature Range Qty. per Reel
SX1240ISTRT
-40 °C to +85 °C
2500
Package
SOIC8-EP
Pb-Free, Halogen Free, RoHS/WEEE compliant product.
APPLICATIONS
Š Low-Cost Consumer Electronic Applications
Š Remote Keyless Entry (RKE)
Š Remote Control / Security Systems
Š Audio Accessories
Š Process and building / home control
Š Active RFID
KEY PRODUCT FEATURES
Š +10 dBm or 0 dBm Configurable output power
Š Bit rates up to 100 kbps
Š FSK and OOK modulation
Š 2 Preconfigured Modes for Operation without MCU
433.92 MHz OOK & 868.3 MHz FSK
Š 1.8 to 3.7 V supply range
Š Low BOM Fully Integrated Txwww.DataSheet.co.kr
Š 8 Selectable Centre Frequencies
Š Programmable Frequency Tuning of low cost XTAL
SX1240, Rev 1, Oct 2010
©2010 Semtech Corp.
Page 1
www.semtech.com
Datasheet pdf - http://www.DataSheet4U.net/






SX1240 Datasheet, Funktion
ADVANCED COMMUNICATIONS & SENSING
SX1240
Integrated Transmitter IC
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, fXOSC = 26 MHz, fRF = 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
Current Consumption
IDDSL
Supply current in sleep mode
IDDT
Supply current in transmit mode
with appropriate external match-
ing.
RF and Baseband Specifications
FDA_D
Frequency deviation, FSK
FDA
Frequency deviation, FSK*
BRF
Bit rate, FSK
BRO
Bit rate, OOK
OOK_B OOK Modulation Depth
RFOP
RF output power in 50 ohms
DRFOPV
PHN
Variation in RF output power with
supply voltage
Transmitter phase noise at
868.3 MHz
FR
FXOSC
STEP
Number of selectable Frequencies
Crystal Oscillator Frequency
RF Frequency Step
DFXOSC Frequency Variation of the Oscilla-
tor Circuit
Timing Specifications
TS_TR
Time from Sleep to Tx mode
TOFFT
Timer from Tx data activity to
Sleep
RAMP
PA Ramp up and down time
RF Power o/p = +10 dBm
RF Power o/p = 0 dBm
Number of programmable values
Permissible Range
Permissible Range
www.DataSheet.co.kr
High Power Setting
Low Power Setting**
2.5 V to 3.3 V
1.8 V to 3.7 V
Offset from centre frequency:
100 kHz
350 kHz
550 kHz
1.15 MHz
No crystal contribution
868 MHz
434 MHz
Programmable
****
Min
-
-
-
-
10
0.5
0.5
-
7
-3
-
-
-
-
-
-
-
26
-
-
-
-
-
-
-
Typ Max Unit
0.5 1 µA
16.5 - mA
9 - mA
8
-
-
-
50
10
0
-
-
-
-
-
-
8
26
3.174
1.587
-
-
100 kHz
100 kbps
10 kbps
- dB
- dBm
- dBm
3 dB
7 dB
-76
-81
-91
-101
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
-
26 MHz
- kHz
- kHz
+/-25 ppm
- 2 ms
2 - ms
20 - ms
20 - us
SX1240, Rev 1, Oct 2010
©2010 Semtech Corp.
Page 6
www.semtech.com
Datasheet pdf - http://www.DataSheet4U.net/

6 Page









SX1240 pdf, datenblatt
ADVANCED COMMUNICATIONS & SENSING
D12 = ’1'
SX1240
Integrated Transmitter IC
DATASHEET
D12 = ’0'
Data
Ctrl
RF Out
TWI Config
TS_TR
TWI Config
RAMP
State
Sleep
Tx
Tx Enable
Data Transmission
Figure 8. Manual Control of Transmitter Enable via the TWI
www.DataSheet.co.kr
Sleep
Tx Off
SX1240, Rev 1, Oct 2010
©2010 Semtech Corp.
Page 12
www.semtech.com
Datasheet pdf - http://www.DataSheet4U.net/

12 Page





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