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PDF SX1243 Data sheet ( Hoja de datos )
| Número de pieza | SX1243 | |
| Descripción | Low Cost Integrated Transmitter IC | |
| Fabricantes | Semtech | |
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SX1243
WIRELESS & SENSING
SX1243 - Low Cost Low Current Integrated Transmitter
310 to 928MHz Frequency Agile
DATASHEET
GENERAL DESCRIPTION
The SX1243 is an ultra-low-cost, fully integrated FSK or
OOK transmitter suitable for operation between 310 and
450 MHz, 860 and 870 MHz, as well as 902 and 928 MHz.
For applications where economy is paramount, the SX1243
may be used without the requirement for configuration via
an MCU. However, in conjunction with a microcontroller the
communication link parameters may be re-configured.
Including, output power, modulation format and operating
channel.
The SX1243 offers integrated radio performance with cost
efficiency and is suited for operation in North America FCC
Part 15.231, FCC Part 15.247 FHSS and Digital Modulation
Techniques, 15.249, and Europe EN 300 220.
ORDERING INFORMATION
Part Number
SX1243IULTRT
Temperature Range
-40 °C to +85 °C
Package
DFN-UT8
MOQ / Multiple
3000 pieces
Pb-Free, Halogen Free, RoHS/WEEE compliant product.
APPLICATIONS
Garage Door Openers
Low-Cost Consumer Electronic Applications
Remote Keyless Entry (RKE)
Remote Control / Security Systems
KEY PRODUCT FEATURES
+10 dBm or 0 dBm Configurable output power
Bit rates up to 100 kbps
OOK and FSK modulation.
1.8 to 3.7 V supply range.
Low BOM Fully Integrated Tx
Fractional-N PLL with 1.5 kHz typical step
Frequency agility for FHSS modulation
FCCwww.DataSheet.co.kr CFR Part 15.247 Digital Modulation Techniques
NRESET
1
DATA
2
GND
3
XTAL
4
PA
CP M/N
PFD
Sigma
/Delta
RFOUT
8
7 TX_READY
CTRL
6
VDD
5
1.8 to 3.7 V
SX1243, Rev 3, May 2012
©2012 Semtech Corporation
Page 1
www.semtech.com
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
WIRELESS & SENSING
SX1243
Integrated Transmitter IC
DATASHEET
2. Electrical Characteristics
2.1. ESD Notice
The SX1243 is an electrostatic discharge sensitive device. It satisfies Class 2 of the JEDEC standard
JESD22-A114-B (Human Body Model) on all pins.
2.2. Absolute Maximum Ratings
Stresses above the values listed below may cause permanent device failure. Exposure to absolute maximum ratings for
extended periods may affect device reliability.
Table 2 Absolute Maximum Ratings
Symbol
VDDmr
Tmr
Tjunc
Tstor
Supply Voltage
Temperature
Junction Temperature
Storage Temperature
Description
www.DataSheet.co.kr
Min Max Unit
-0.5 3.9 V
-55 115 ° C
-55 125 ° C
-55 150 ° C
2.3. Operating Range
Operating ranges define the limits for functional operation and the parametric characteristics of the device as described in
this section. Functionality outside these limits is not implied.
Table 3 Operating Range
Symbol
VDDop
Top
Clop
Description
Supply voltage
Operational temperature range
Load capacitance on digital ports
Min Max Unit
1.8 3.7 V
-40 85 ° C
- 25 pF
SX1243, Rev 3, May 2012
©2012 Semtech Corporation
Page 5
www.semtech.com
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
WIRELESS & SENSING
SX1243
Integrated Transmitter IC
DATASHEET
4.3. Application Mode: Power & Go
The default ‘Power & Go’ application mode sees the SX1243 configured as detailed in Table 6. By changing the logical
state of the CTRL pin at Power-up or Reset, two distinct configuration modes can be selected. The Power & Go application
modes hence permit microcontroller-less operation.
Table 6 Configuration in Power & Go Mode
CTRL Pin
Configuration
‘Low’ FSK 868.3 MHz, +10 dBm, Fdev=+/-19.2 kHz
‘High’ OOK 433.92 MHz, +10 dBm
Mode
Power&Go 1
Power&Go 2
4.4. Application Mode: Advanced
4.4.1. Advanced Mode: Configuration
As described on Figure 4, Advanced mode is entered when accessing the Two Wire Interface (TWI) bus of the SX1243.
Upon communication to the register at up to 10 MHz of clocking speed, complete flexibility on the use of the chip is
obtained.
Once all register settings are selected (see registers detailed description in section [5]), the SX1243 can be used either in
Automatic mode by simply toggling the DATA pin, or in Forced Transmit mode to optimize timings for instance.
4.4.2. Frequency Hopping Spread Spectrum
www.DataSheet.co.kr
Frequency hopping is supported in Advanced mode. After sending the data stream in the first channel, the user can send
a Frequency change instruction containing the new channel frequency. The circuit will automatically ramp down the PA,
lock the PLL to the new frequency, and turn the Power Amplifier back on. The user can then send his packet data on the
new channel. Timings are detailed hereafter:
t < TOFFT
(2 or 20 ms)
TWI
instruction
t < TOFFT
(2 or 20 ms)
DATA
Frequency change
CTRL
Frequency change
RFOUT
5th falling
edge on CTRL
24th falling
edge on CTRL
Tx Channel A
TS_HOPi
Figure 6. Frequency Hopping Description
Tx Channel B
Notes - During any TWI access, the input of the modulator is inhibited
- The time between two Frequency change instructions shall be greater than TS_HOPi
- FHSS modulation, as described under FCC part 15.247, is supported by the SX1243; also note that the large
Frequency Deviation settings available on the SX1243 make it suitable for “Digitally Modulated Systems”, as
described under FCC Part 15.247 (a)(2)
SX1243, Rev 3, May 2012
©2012 Semtech Corporation
Page 11
www.semtech.com
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
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