XE1203SKC868XE2 Semtech, XE1203SKC868XE2 Datasheet - Page 31

• 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

6.1
6.2
6
This section provides details of the recommended component values for the frequency dependant blocks of the
XE1203F. Note that these values are dependent upon circuit layout and PCB structure, and that decoupling
components have been omitted for clarity.
The schematic of the matching network at the input of the receiver is given below in
impedance of 50Ω).
The typical recommended values for the external components are shown in Table 21:
The optimum load impedances for 15 dBm output power at the three main frequencies are shown in Table 22:
The Smith charts in Figure 20, Figure 21, and Figure 22 below show contours of output power versus load
impedance when the highest transmit level is selected, i.e. 15 dBm:
© Semtech 2008
APPLICATION INFORMATION
RECEIVER MATCHING NETWORK
TRANSMITTER MATCHING NETWORK
Name
CR1
CR2
CR3
LR1
PA optimum load
SOURCE
CR3
Table 22: Optimum load impedances for 15 dBm output power
Table 21: Typical component values for the matching network
Typical Value
for 434 MHz
100 nH
1.5 pF
1.5 pF
NC
Figure 19: Receiver matching network
CR1
CR2
102 – 12j
434 MHz
Typical Value
for 868 MHz
1.5 pF
1.2 pF
27 nH
LR1
NC
31
868 MHz
78 + 19j
Typical Value
for 915 MHz
1.0 pF
1.0 pF
27 nH
RFA
RFB
NC
XE1203
915 MHz
83 + 18j
Tolerance
± 5 %
± 5%
± 5%
± 5%
Figure 19
XE1203F
(for a source
www.semtech.com