XE1203F 查看數據表（PDF） - Semtech Corporation

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XE1203F

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

Semtech Corporation 

XE1203F

The typical component values of this matching circuit are shown below in Table 23:

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 868 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

Tolerance

± 5%

± 5%

± 5%

± 5%

± 5%

± 5%

± 5%

± 5%

Table 23: Typical component values for the recommended matching network at the output of the transmitter

6.3 VCO TANK

The tank of the VCO is implemented with one inductor in parallel with one capacitor. The characteristics of these

two components must be as follows:

Name

CV1

LV1

Typical Value

for 434 MHz

1.0 pF

33 nH

Typical Value

for 868 MHz

NC

8.2 nH

Typical Value

for 915 MHz

NC

6.8 nH

Table 24: VCO tank external components

Tolerance

±5%

±2%

6.4 LOOP FILTER OF THE FREQUENCY SYNTHESIZER

The loop filter of the frequency synthesizer is shown in Figure 24 below:

RL1

CL2

CL1

LFB

XXEE11220033F

Figure 24: Loop filter of the frequency synthesizer

© Semtech 2007

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