SM1211E915 Semtech, SM1211E915 Datasheet - Page 32

• Manufacturer Part Number: SM1211E915
• Description: Dev Kit Accessory
• Manufacturer: Semtech

Specifications of SM1211E915

• Modulation Type: FSK, OOK
• Data Rate Max: 200Kbps
• Frequency Range: 902MHz To 928MHz
• Supply Voltage Range: 2.1V To 3.6V
• Module Interface: SPI
• Supply Current: 25mA
• Accessory Type: RF Module
• Sensitivity: -105dBm
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Package Type: TQFN EP
• Operating Supply Voltage (min): 2.1V
• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Supply Voltage (max): 3.6V
• Sensitivity (dbm): -105dBm
• Rohs Compliant: NA
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

For proper operation, the Bit Synchronizer must first receive three bytes of alternating logic value preamble, i.e.
“0101” sequences. After this startup phase, the rising edge of DCLK signal is centered on the demodulated bit.
Subsequent data transitions will preserve this centering.
This has two implications:
This implies approximately 6 consecutive unbalanced bytes when the Bit Rate precision is 1%, which is easily
achievable (crystal tolerance is in the range of 50 to 100 ppm).
Bit Synchronizer and Active channel filter settings are a function of the reference oscillator crystal frequency, F
Settings other than those programmable with a 12.8 MHz crystal can be obtained by selection of the correct
reference oscillator frequency. Please contact your local Semtech representative for further details.
After OOK or FSK demodulation, the baseband signal is made available to the user on pin 20, DATA, when
Continuous mode is selected.
In Buffered and Packet modes, the data is retrieved from the FIFO through the SPI interface.
Rev 7 – Sept 2
ADVANCED COMMUNICATIONS & SENSING
Firstly, if the Bit Rates of Transmitter and Receiver are known to be the same, the SX1211 will be able to
receive an infinite unbalanced sequence (all “0s” or all ”1s”) with no restriction.
If there is a difference in Bit Rate between Tx and Rx, the amount of adjacent bits at the same level that the
BitSync can withstand can be estimated as:
3.4.12. Alternative Settings
3.4.13. Data Output
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NumberOfBi
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