XE1205SKC433XE1 Semtech, XE1205SKC433XE1 Datasheet - Page 9

• Manufacturer Part Number: XE1205SKC433XE1
• Description: KIT STARTER FOR XE1205 433MHZ
• Manufacturer: Semtech
• Series: TrueRF™r
• Type: Transceiver, ISMr

Specifications of XE1205SKC433XE1

• Frequency: 433MHz
• For Use With/related Products: XE1205 (433MHz)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

XE1205
If the bit synchronizer is disabled, the DCLK output is held low and the raw demodulator output appears at DATA.
.
RXParam_Disable_bitsync
1
DATA
data
0
FSK
I_lim
DEMODULATOR
BIT
data
SYNCHRONIZER
Q_lim
IRQ_1(DCLK)
dclk
RX aram_Pattern
P
IRQParam_Rx_irq_0(1:0)
PATTERN
RXParam_RSSI
MATCHING
pattern
IRQ_0
RSSI
RSSI_irq
Figure 2: Receiver chain in continuous mode
5.2.3.1
Demodulator in continuous mode
The demodulator section comprises FSK demodulator, bit synchronizer, and Pattern Recognition blocks.
Data from the FSK baseband limited signals I_lim and Q_lim is first demodulated before passing to the bit synchronizer.
If the end-user application requires direct access to the output of the demodulator, then the RXParam_Disable_bitsync
bit must be set high. In this case the demodulator output is directly connected to the DATA pin and the IRQ_1 pin
(DCLK) is set to low.
For best operation of the demodulator it is recommended the modulation index β of the input signal meets the following
condition:
Δ
β
2
f
=
≥
2
BR
where Δf is the frequency deviation and BR the bit rate.
© Semtech 2008
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