XE1203SKC868XE2 Semtech, XE1203SKC868XE2 Datasheet - Page 8

• Manufacturer Part Number: XE1203SKC868XE2
• Description: KIT STARTER FOR XE1203 868MHZ
• Manufacturer: Semtech
• Series: TrueRF™r
• Type: Transceiver, ISMr

Specifications of XE1203SKC868XE2

• Frequency: 868MHz
• For Use With/related Products: XE1203 (868MHz)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

4.1.1
4.1.2
4.1.3
used to sample the DATA signal without additional external signal processing. In addition, the receiver includes a
digital Received Signal Strength Indicator (RSSI), a Frequency Error Indicator (FEI) that provides information about
the local oscillator frequency error, and a pattern recognition function to detect preprogrammed sequences in the
received serial data stream. Finally, a user-selectable Barker coding/decoding feature can be activated to spread
the outgoing data with an 11-bit Barker code upon transmission and decode the incoming data upon reception by
correlating the spread data with the 11-bit Barker code.
The LNA of the receiver has two programmable operation modes: the high sensitivity mode, Mode A, for reception
of weak signals; and the high linearity mode, Modxe B, for strong signals. The operation mode is defined by the
contents of the SWParam_Rmode1 and SWParam_Rmode2 Configuration Register bits.
The demodulation chain consists of an FSK demodulator, bit synchronizer, Barker decoder and a Pattern
Recognition block. Figure 2 below illustrates the interaction between each section of the demodulation chain.
The demodulator provides a demodulated data stream from the received FSK modulated base band limited
signals, I_lim and Q_lim. If the end-user application requires direct access to the output of the demodulator, then
the RTParam_Bitsync and RTParam_Barker Configuration Register bits are set low (disabled). In this case the
© Semtech 2008
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LNA & Receiver modes
Demodulation chain
Demodulator
Mode A: High sensitivity mode, approximately 13dB better than in Mode B (see 3.2.2, RFS parameter)
Mode B: High Linearity mode, IIP3 approximately 15dB higher than in Mode A (see 3.2.2, IIP3 parameter)
DEMODULATOR
FSK
FSParam_BR
RTParam_Barker
RTParam_Bitsync
pow
pow
SYNCHRONIZER
Figure 2: Demodulation architecture
DECODER
BARKER
BIT
data
dclk
data
8
RTParam_Pattern
dclk
data
ADParam_Psize
ADParam_Pattern
ADParam_Ptol
pow
RECOGNIZER
PATTERN
CONTROL
DATA
pattern
data
dclk
XE1203F
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