XE1205I074TRLF Просмотр технического описания (PDF) - Semtech Corporation

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XE1205I074TRLF

180 MHz – 1GHz Low-Power, High Link Budget Integrated UHF Transceiver

Semtech Corporation 

XE1205

The schematic of the recommended matching network at the output of the transmitter is given in Figure 28 below. The

two Π-sections are used to provide harmonic filtering to satisfy FCC and ETSI regulations.

OUTPUT

VDD

CT2

LT3

CT3

LT2

XE1205

RFOUT

Figure 28 Matching network at the output of the transmitter.

The typical component values of the matching circuit are shown in Table 31 below.

Name

CT1

CT2

CT3

CT4

CT5

LT1

LT2

LT3

Typical Value

for 434 MHz

6.8 pF

1.0 pF

22 pF

6.8 pF

4.7 pF

33 nH

22 nH

22 nH

Typical Value

for 869 MHz

1.5 pF

0.56 pF

15 pF

3.3 pF

2.2 pF

39 nH

10 nH

8.2 nH

Typical Value

for 915 MHz

1.8 pF

NC

33 pF

3.3 pF

2.2 pF

47 nH

10 nH

8.2 nH

Table 31: Matching circuit component values

8.3 VCO TANK

Tolerance

± 5%

± 5%

± 5%

± 5%

± 5%

± 5%

± 5%

± 5%

The VCO tank circuit should implemented with an inductor and capacitor in parallel. Typical component values are

shown in Table 32.

Name

CV1

LV1

434 MHz

1.0 pF

33 nH

869 MHz

NC

6.8 nH

915 MHz

NC

5.6 nH

Table 32: VCO tank component values

Tolerance

±5%

±2%

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