TDA5252G2 INFINEON [Infineon Technologies AG], TDA5252G2 Datasheet - Page 41

• Manufacturer Part Number: TDA5252G2
• Description: ASK/FSK 915MHz Wireless Transceiver
• Manufacturer: INFINEON [Infineon Technologies AG]

Figure 3-4
R1 does not influence the matching because of its very high resistance. Due to the large
capacitance of C1, C6 and C5 the circuit can be further simplified for RF:
Figure 3-5
The LNA-matching is RF-grounded now, so no power is lost in the LNA-input. The PA-matching
consists of C2, C3 L2, C4 and L1.
When designing the matching of the PA, C2 must not be changed anymore because its value is
already fixed by the LNA-input-matching.
Data Sheet
TX_Mode
TX_Mode_simplified
RX/TX-pin of IC)
SMA-connector
(with jumper or
SMA-connector
grounded
50 Ohm
RF I/O
50 Ohm
RF I/O
RX/TX
C2
C2
C1
R1
C6
C7
C7
C3
C3
41
L3
L3
L2
L2
C9
C9
C4
C4
L1
C10
L1
C10
VCC
C5
RX/TX
LNI
PA
LNIX
LNI
LNIX
PA
TDA5252 G2
TX_Mode_simplified.wmf
Version 1.1
Application
2007-02-26
TX_Mode.wmf