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USER MANUAL V0.82 

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TCM 300 / 300C / 320 / 320C User Manual V0.82  |  Page 26/43 

 

 

TCM 300 / 300C / 320 / 320C 

 
In order to provide a good radio performance, great attention must be paid to the power 
supply and a correct layout and shielding. It is recommended to place a 22 µF ceramic ca-

pacitor between VDD and GND close to the module (material: X5R, X7R, min 6.3 V to avoid 
derating effects). In addition a 470 nH coil shall be inserted (Murata LQW18A, 0603) in the 

power supply line. 
 
It is recommended to keep the ripple on the power supply rail below 10 mVpp (see 

 

2.4).