XE1202A View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

XE1202A

433 MHz / 868 MHz / 915 MHz Low-Power, Integrated UHF Transceiver

Semtech Corporation 

XE1202A TrueRF™

6 Application Information

This section provides details of the recommended component values for the frequency dependant blocks of the

XE1202A TrueRF™. Note that these values are dependent upon circuit layout and PCB structure, and that

decoupling components have been omitted for clarity.

6.1 Receiver matching network

The schematic of the matching network at the input of the receiver is given Figure 13 below (for a source

impedance of 50 Ω).

SOURCE

CR3

CR1

VSS

CR2

RFA

XE1202A

LR1

TErAuGeLREF™ASIC

RFB

Figure 13: Receiver matching network

The typical recommended values for the external components are given in Table 25:

Name

CR1

CR2

CR3

LR1

434 MHz

1.5 pF ± 5 %

1.5 pF ± 5 %

NC

100 nH ± 5 %

868 MHz

1.2 pF ± 5 %

1.5 pF ± 5 %

NC

27 nH ± 5 %

915 MHz

0.82 pF ± 5 %

0.82 pF ± 5 %

NC

27 nH ± 5 %

Table 25: External Matching Components

6.2 Transmitter matching network

The optimum load impedances for 15 dBm output power at the three main frequencies are given in Table 26:

PA optimum load

434 MHz

66 – 5j

868 MHz

66 + 14j

915 MHz

64 + 13j

Table 26: Optimum load impedance versus frequency

© Semtech 2006

27

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