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IC501
• ERROR AMP
• APC CIRCUIT
OPTICAL
PICK-UP
REMOTE CONTROLLER
UNIT
LCD
KEY
IC551(1/2)
SERVO DRIVER
POWER SUPPLY
1.5[V]
Fig. 4-1. is the general system block diagram. The MZ-E30 belonging to the fourth generation is generally composed of the
system controller (IC801) to control the system as a whole as illustrated in the figure. In addition, a digital signal processor and
a digital servo system are mainly composed of the DSP/digital servo LSI µPD63730GC (IC601) for playback.
Other main system components, moreover, include the servo driver (IC551) and RF amplifier (IC501), in which a power
supply circuit is also included.
The DSP/digital servo µPD63730GC for playback is provided with most of those functions which are required for a Mini
Disc to play back, such as ATRAC decoder, EFM decoder, ACIRC decoder, ADIP decoder, DRAM controller, etc. In
addition, it comprises the digital servo (DSSP) and clock generator circuits. Built in the RF amplifier, moreover, are such
circuits as the I-V converter amplifier capable of setting a gain, based on the serial data from the system controller, including
a servo error extractor circuit, an APC circuit and so on.
The D/A converter (IC301) is of the low-voltage 1-bit type, in which a digital de-emphasize function is built, in addition
to the digital filter applicable to 8-multiple oversampling and to a digital Dynamic Bass Boost (DBB). And the headphone
amplifier (IC302) employed in the next stage is of low-power consumption type in which a mute function is incorporated.
The system controller serves to control the RF amplifier and the power supply circuit while processing a digital signal and
controlling the digital servo, together with the DSP/digital servo. In addition, functions to detect a key-in and a remote control
signal, and to control and drive the LCD are also available. The memory (IC802) connected to the system controller is an EEP
ROM (nonvolatile memory) to store mainly servo-system data, such as a traverse supplementary value in the adjustment
(overall regulation) mode, a focus bias, etc. Stored in this memory are the sound volume data just before the power supply
enters the sleep mode, and the stop position address data to be used in the resume function. These data are transferred to each
circuit upon startup.
4. OUTLINE OF SYSTEM
IC601
EFM SIGNAL
RF AMP
ERROR SIGNAL
DSP/DIGITAL SERVO
• ATRAC DECODER
• RAM CONTROLLER
• ACIRC DECODER
• EFM DEMODURATOR
• DIGITAL SERVO PROCESSOR
IC801
SYSTEM CONTROLLER
• CONTROL THE WHOLE SYSTEM
• LCD DRIVER
• CONTROL THE RF AMP. IC
• CONTROL THE DSP IC
IC901
DC-DC
CONVERTER
LCD
8[V]
2.8[V]
2.5[V]
Fig. 4-1. General System Block Diagram
IC602
4M DRAM
IC301
DA DATA
D/A CONVERTER
CONTROL
IC551(2/2)
SIGNAL
SERVO DRIVER
IC803
SLED MOTOR
CONTROL
EEPROM
IC802
— 10 —
IC302
L/R
L/R
H.P.
AUDIO OUTPUT
AMP
FOCUS/TRACKING
FOCUS
SERVO COIL
TRACKING
SPINDLE
M
SPINDLE
MOTOR
SLED
M
SLED
MOTOR
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