Blu STUDIO 5.0S II, Service Manual

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3. BASEBAND PARTS
STUDIO 5.0S II’s baseband is composed of MT6582 .The MT6582 is the core chipset with
responsibility for the audio, communication and the control of all parts of the system.
The digital baseband in MT6582 is the strengthen GSM processor with integrated channel
encoder/decoder, complex/de –complex, encrypt/decrypt and other subsystems of
coder/decoder.
The analog parts mainly include the analog part of the MT6582, audio part of MT6582 and
the coder/decoder in it.The analog part of the chipset integrate three function modules; two
separates audio input/output channel, the audio decoder for buzzer the differential I/Q input
/output, GMSK modulator, and A/D D/A coder/decoder.
Besides these, they also include the parts of AFC/ DAC/ RAMP DAC/AGC DAC/and a
auxiliary four channels A/D converter. And also, an integrated watch dog interface in used
to enhance the stabilization of the system.
The MT6323 include a power management function most of the power supply of the
system is made by its integrated 25 LDOs .And the chipset also has the function of
management of the charge.
Power Management
The power management part is composed of the PMU chipset and the periphery charging
circuit the logic level translation of SIM card and the reset signal of the system are all made
by the PMU. The output of the LDO integrated in the chipset as below: