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XE1203F View Datasheet(PDF) - Semtech Corporation

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XE1203F
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.
4.1.1 LNA & Receiver modes
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.
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)
4.1.2 Demodulation chain
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.
RTParam_Barker
pow
BARKER
DECODER
data
dclk
FSK
DEMODULATOR
data
RTParam_Bitsync
pow
BIT
SYNCHRONIZER
FSParam_BR
data
dclk
DATA
CONTROL
data
dclk
RTParam_Pattern
pow
PATTERN
RECOGNIZER
ADParam_Pattern
ADParam_Psize
ADParam_Ptol
pattern
Figure 2: Demodulation architecture
4.1.3 Demodulator
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
© Semtech 2007
www.semtech.com
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