TDA5250XT Infineon Technologies, TDA5250XT Datasheet - Page 39
TDA5250XT
Manufacturer Part Number
TDA5250XT
Description
Manufacturer
Infineon Technologies
Datasheet
1.TDA5250XT.pdf
(94 pages)
Specifications of TDA5250XT
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Operating Temperature Classification
Industrial
Product Depth (mm)
4.4mm
Product Length (mm)
9.7mm
Operating Supply Voltage (min)
2.1V
Operating Supply Voltage (max)
5.5V
Lead Free Status / Rohs Status
Compliant
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3
3.1
3.1.1
Figure 3-1
The RX/TX-switch combines the PA-output and the LNA-input into a single 50 Ohm SMA-
connector. Two pin-diodes are used as switching elements. If no current flows through a pin diode,
it works as a high impedance for RF with very low capacitance. If the pin-diode is forward biased, it
provides a low impedance path for RF. (some Ω)
3.1.2
The RX/TX-switch is set to the receive mode by either applying a high level or an open to the RX/
TX-jumper on the evalboard or by leaving it open. Then both pin-diodes are not biased and
therefore have a high impedance.
Data Sheet
Application
LNA and PA Matching
RX/TX Switch
Switch in RX-Mode
RX/TX Switch
SMA-connector
50 Ohm
RF I/O
RX/TX
C2
C1
D2
R1
C6
D1
C7
39
C3
L3
L2
C9
C4
L1
C10
VCC
C5
RX/TX
LNI
LNIX
PA
TDA5250 D2
Version 1.7
Application
RX/TX_Switch.wmf
2007-02-26
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