MITSUBISHI RF POWER MODULE

RoHS COMPLIANCE

RA45H8994M1

RA45H8994M1

MITSUBISHI ELECTRIC

29

8/9

ELECTROSTATIC SENSITIVE DEVICE

OBSERVE HANDLING PRECAUTIONS

Output Power Control:

Depending on linearity, the following three methods are recommended to control the output power:

a) Non-linear FM modulation at high power operating:

only a small leakage current flows from the battery into the drain.

b) Linear AM modulation:

Load condition of Output terminal:

This module suppose to use on the condition that load impedance is 50ohm. On the over load condition,this module

run into the short mode in the worst case and the module involve the risk of burn out and smoking of parts including

the substrate in the module.

Oscillation:

To test RF characteristics, this module is put on a fixture with two bias decoupling capacitors each on gate and

drain, a 4.700 pF chip capacitor, located close to the module, and a 22 µF (or more) electrolytic capacitor.

When an amplifier circuit around this module shows oscillation, the following may be checked:

a) Do the bias decoupling capacitors have a low inductance pass to the case of the module?

Frequent on/off switching:

In base stations, frequent on/off switching can cause thermal expansion of the resin that coats the transistor chips

and can result in reduced or no output power. The bond wires in the resin will break after long-term thermally

induced mechanical stress.

Quality:

Mitsubishi Electric is not liable for failures resulting from base station operation time or operating conditions

exceeding those of mobile radios.

This module technology results from more than 20 years of experience, field proven in tens of millions of mobile

radios. Currently, most returned modules show failures such as ESD, substrate crack, and transistor burnout,

which are caused by improper handling or exceeding recommended operating conditions. Few degradation failures

are found.

Mitsubishi Electric Corporation puts the maximum effort into making semiconductor products better and more reliable, but there

is always the possibility that trouble may occur. Trouble with semiconductors may lead to personal injury, fire or property

damage. Remember to give due consideration to safety when making your circuit designs, with appropriate measures such as

(i) placement of substitutive, auxiliary circuits, (ii) use of non-flammable material, or (iii) prevention against any malfunction or

mishap.

Keep safety first in your circuit designs!