ML7436N LSI Hardware Design Manual
FEXL7436NDG-01
23
8.
Parts selection
8.1.
Antenna
It is recommended to use an antenna with the specifications shown in
Table 8.1
. Select an antenna with the best
directive characteristics for your specific operating, environmental and installation condition. Since antennas are
affected by installation conditions such as GND, external factors should always be taken into account. It is
recommended to ask the manufacturer of the selected antenna for installation details in relation to various factors,
including the shape and stray capacitance of the board to be used.
Table 8.1 Recommended antenna character
Frequency band
430MH
ｚ
/860MHz/ 920MHz/2.4GHz band
VSWR
2.0MAX
Nominal impedance
50Ω
8.2.
Inductors
Use inductors with high Q. It is recommended to use LQW03AW series (manufactured by Murata Manufacturing Co.
Ltd) or equivalent. Use inductors for the switching regulators that DC resistance is less than 0.4Ω, the rated current is
more than 800mA Max.
8.3.
Capacitors
Take the working voltage and temparature into account, because ordinary seramic capacitor has the temparature
character and the voltage character. Use capacitors with a CH or a B of temperature characteristics. It is recommended
to use capacitors of 0 ± 60 ppm/°C or less for areas that affect wireless characteristics. ML7436N equipes low power
consumption mode (SLEEP mode). SLEEP mode can not ignore the leak current of the external capacitors. It is
recommended to use the low leak current parts to design low power consumption.
8.4.
Resisters
Use resistors for which the resistance variation are small when the temperature changes.
