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1 Front End Part (MN35103UB, MN35104UB:IC1501)
MN35103UB and MN35104UB are 1-chip LSI for DVD-Player. The connection of this LSI to the Driver IC,
SDRAM, Flash-ROM, Audio-DAC, etc. can configure the DVD-Player System.
This LSI contains Front End (SODC/FE) that performs RF signal /Servo /Decode processings, Back End
(AV decoder/BE) that performs the video decode processing such as MPEG1/MPEG2/JPEG and audio decode
processing such as DVD-Audio/AC-3/DTS/MP3, and the system controller (Siscon) for controlling the system.
Front End part realizes the arithmetic processing of optical head signal and RF signal processing,
the digital signal processing for DVD-ROM reproduction that conforms to DVD standards (16-8 Demodulation,
Error correction), the digital signal processing for CD-DA/CD-ROM (Error correction), AV decoder transmission,
servo control, spindle motor control and seek control.
Please take note that, since (FEP) and (SODC) with DVD mecha-module (MS3) of CX-3016 are integrated into
one chip at MN35103UB and MN35104UB, the waveforms of servo system on the front end which had
previously appeared at MS3, i.e., the waveforms of FE, TE and AS, cannot be seen anymore.
1.1 Analog Block (MN35103UB, MN35104UB:IC1501)
The analog block for IC1501 generates the servo signals including focus and tracking, processes addition of
RF signals, and controls the laser power of pickup.
The servo system contains focus operation amp, focus offset adjustment circuit, 3-beam tracking operation amp,
phase difference tracking detection circuit, tracking offset adjustment circuit, TE2 value-making circuit.
Also, RF signal processing system contains the functions of AGC and equalizer.
1.1.1 APC Circuit
The optical output for the laser diode (LD) has large minus temperature characteristics. Therefore, the constant
optical output cannot be obtained when LD is driven by the constant current. APC circuit controls the electric
current so as to provide constant output at the monitor diode (MD). MN35103UB and MN35104UB contain two
types of APC circuits, one for DVD and another for CD. The LD electric current for DVD (CD) can be obtained by
dividing the voltage measurements between DVDLD1 (CDLD1) and 5V by 15.6
4=15.6 ). For DVD (CD),
the results are approx. 26mA (44mA).
1. CIRCUIT DESCRIPTIONS