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XE1205
The XE1205 single-chip solution is an integrated circuit intended for use as a low cost FSK transceiver to establish a
frequency-agile, half-duplex, bi-directional RF link, with non-return to zero data coding. The device is available in a VQFN
48 package and is designed to provide a fully functional multi-channel FSK transceiver. It is intended for applications in the
433 MHz and 868 MHz European bands and the North American 915 MHz ISM band. The single chip transceiver operates
down to 2.4V. Its ability to operate with 25 kHz channel spacing makes it compliant with requirements of ETSI EN300 220-
1 and makes the XE1205 ideal for automatic meter reading and alarms.
1
NON-CONFORMANCE
Please note early version lot codes whose date-codes start with N3K, N4K and N5K (except N5K3760, N5K3760A,
N5K3760B and N5K6993) exhibit a non-conformance to specification. The non-conformance affects the FIFO buffer
described in section 5.2.5. Please use the FIFO in this product only in conjunction with the Technical Note TN1205.01
(available www.semtech.com). All other date-codes are in conformance with the specification.
2
FUNCTIONAL BLOCK DIAGRAM
IAMP
IAMP
IRQ_0
IRQ_1
FAMP
LPF
BBAMP
LIM
MOSI
MISO
MATCHING
NETWORK
RFA
RFB
LNA
DEMOD
BITSYNC
SCK
NSS_DATA
FAMP
LPF
BBAMP
LIM
PATTERN
MATCHING
CHIP
INTERFACE
NSS_CONFIG
SW(0)
SW(1)
RSSI
FIFO
DATA
LO_BUF
PHASE
SHIFTER
IREF
FEI
MMOD
DIVCTL
modulator
/n Synthesizer
Data shaping
filter
RFOUT
DIVIDER
CLKXTAL
XE1205
CH PUMP
MATCHING
NETWORK
PA
VCO
PFD
OSCILLATOR
/n
CLOCK OUT
IREF
POR
TKA
TKB
LFB
XTA
XTB
CLKOUT TSUPP TMOD(3:0)
POR
VCO
TANK
LOOP
FILTER
XTAL
Figure 1: XE1205 block diagram.
? Semtech 2008
3
www.semtech.com
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