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3. DIFFERENCE IN SYSTEM CONFIGURATIONS BY GENERATION
For a Mini Disc of playback type, each system is composed of such principal LSIs as shown in Table 3-1.. The difference
between the first and second generations lies in the L/Rch, two pieces of which have been employed in the ATRAC decoder
of the first generation and are intensified into a single LSI in the second generation. The third generation, moreover, has had
the principal LSIs intensified into three pieces except for the servo driver as shown in the table.
In the fourth generation, on the other hand, has been far larger sized and more highly integrated. As a result, the principal
circuit of a Mini Disc has been intensified into a single LSI while six LSIs, including the ATRAC decoder, were employed in
the first generation.
In the case of a playback type model heretofore available, a playback circuit and a decoder circuit have been employed while
jointly using the principal LSI with a recorder/playback unit. The MZ-E30, however, employs an newly developed LSI for the
exclusive use of playback, which has especially main functions, such as shock-proof, ATRAC decoding, EFM decoding and
ACIRC decoding.
The principal LSI in the fourth generation are outlined below.
µPD63730GC
: DSSP (digital servo): EFM decoder, ACIR decoder, DRAM controller, ADIP decoder, and clock generator
circuit
MPC17A55FTA : Servo drive circuit, and step up/down power supply circuit
SN761050A
: RF amplifier, and I-V amplifier with a gain adjustment switch
Table 3-1. Principal LSIs Employed in a Mini Disc for Playback
Applicable Model
Circuit Block
ATRAC Decoder
Shock-proof Memory Controller
EFM ACRIC Decoder
ADIP Demodulator
Servo Signal Processor
Servo Driver
RF Amplifier
1st Generation
2nd Generation
MZ-2P
CXD2527R(2)
CXD2531AR
CXD2526Q
CXD2526AR
CXD2525R
CXD2525R
CXA1380N
CXA1380N
CXA1602R
CXA1602R
MPC1718PU
MPC1718PU
CXA1381R
CXA1861R
— 7 —
3rd Generation
MZ-E3
MZ-E2
MZ-E40
CXD2536R
CXD2535BR
MPC17A38VM
CXA1981AR
4th Generation
MZ-E30
µPD63730GC
MPC17A55FTA
SN761050A
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