ax5042-1 AXSEM, ax5042-1 Datasheet - Page 38

• Manufacturer Part Number: ax5042-1
• Description: Rf Transceiver
• Manufacturer: AXSEM

38
Application Information
7.2.
Single-Ended Antenna Interface
The ANTP and ANTN pins provide RF input to the LNA when
output from the PA when
with an optional matching network. The network must provide DC power to the PA and LNA.
A biasing to VDD is necessary.
Beside biasing and impedance matching, the proposed networks also provide low pass
filtering to limit spurious emission.
Frequency
Band
Version 2.2
868 / 915 MHz
433 MHz
IC Antenna
Pins
Antenna Interface Circuitry
L1
L2
VDD
VDD
Figure 6 Structure of the antenna interface to 50Ω single-ended equipment or antenna
C1
L1=L2
[nH]
18
33
[pF]
C1
2.2
L3
L4
3
AX5042
L3=L4
C3
[nH]
12
33
is in transmit mode. A small antenna can be connected
C2
L5
C4
[pF]
C2
2.2
3.3
C5
L6
C3=C5
[pF]
1.8
3.3
CA
AX5042
L5=L6
[nH]
18
39
LB
CB
is in receive mode, and RF
[nH]
LB
6.2
12
C6
Datasheet AX5042
CA=CB
[pF]
8.2
18
50Ω single-
ended
equipment
or antenna
C4=C6
[pF]
220
220