XE1205SKC433XE1 Semtech, XE1205SKC433XE1 Datasheet - Page 38

• 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

Figure 23 illustrates the switching time between two carrier frequencies in receive mode. TS_RFSW is defined as the
switching
the boost process is used (Init_filter set to “11”).
Figure 24 shows the switch
switching time of the frequency synthesizer and the time required by the power amplifier to reach the steady-state
operating conditions.
7.3.2
If MCParam_Select_mode is high then the trans
MCParam_Chip_mode can be used in read mode but has no effect on the transceiver mode.
The refer
external 39 MHz quartz crystal or a TCXO or an external clock. If an external clock is used, the register OSCParam_Osc
has to be set high, and the 39 MHz clock signal should to be supplied to the pin “XTA” and the pin “XTB” should be left
open. If a TCXO is used, its output signal should be connected to the pin “XTA” and the pin “XTB” should be left.
T
overtone operation requires an internal resistor to be connected in parallel with the crystal. This resistor can be
connected by programming the register OSCParam_Resxosc(3:0). The required value depends on the crystal
© Semtech 2008
he transceiver can be used with a 39 MHz fundamental mode quartz crystal or with a 3
7.4
Programmed frequency
NSS_CONFIG
A
Programmed frequency
NSS_CONFIG
A
Actual mode
Actual mode
ctual frequency
ctual frequency
ence clock used for the frequency synthesizer and t
XE1205 switching time using SW(1:0) pins.
SELECTION OF THE REFERENCE FREQUENCY
time of the frequency synthesizer and the time needed by the base band filter to reach the steady-state when
Figure 24. Switching between two carrier frequencies in transmit mode.
Figure 23. Switching between two carrier frequencies in receive mode.
ing time between two carrier frequencies in transmit mode. TS
f1
f1
f1
f1
transmit
receive
ceiver mode is fixed by SW(1:0) pins and register
38
he internal digital circuitry may be generated by either an
TS_RFSW
TS_TFSW
f2
f2
f2
f2
_TFSW is defined as the
rd
overtone crystal. Third
XE1205
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