ML7436N LSI Hardware Design Manual
FEXL7436NDG-01
11
6.
Hard Reset
Please adopt a reset IC to execute hard reset of ML7436N. The reset IC needs to control RESETN(#13) pin.
7.
RF matching circuit
This chapter explains the development method of RF matching circuit. The ordinary antenna impedance is 50Ω. The
input impedance at the antenna edge is needed to convert into 50Ω. The misalignment of impedance causes the
deterioration of the reception sensitivity. The adjustment of antenna impedance having transmission circuit as reference
can maximize the power efficiency of transmission circuit.
is the Measured RF impedance of each RF pins.
Table 7.1
Measured RF impedance of each RF pins
R + jX [Ω]
TX [RF_PA_OUT1(#33) pin]
RX [RF_LNA_IN1(#35) pin]
Measured
frequency
13dBm
10dBm
0dBm
-
433MHz
44.4-j29.4
41.0-j23.7
28.3 -j7.7
63.4-j225.7
868MHz
23.0-j14.9
22.0-j11.0
17.1+j2.0
24.6-j114.1
920MHz
21.2-j13.6
21.4-j10.1
17.1+j3.3
22.0-j106.6
R + jX [Ω]
TX [RF_PA_OUT2(#38) pin]
RX [RF_LNA_IN2(#37) pin]
Measured
frequency
0dBm
-
2.402GHz
19.5+j9.0
7.5-j14.2
[Note] These component values appropriate for use on the LAPIS Technology’s RF board. It is not guaranteed to
obtain same result on your specific board.
