NEO DVD-HT750, Service Manual

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. Focusing error signal generator for CD-ROM, DVD-ROM and DVD-RAM (DAD method).
. RF level signal generator.
. Sub-beam added signal for 3 beams CD_ROM.
. One beam push-pull signal generator for central servo application.
. High speed RF envelop detection circuit with bandwidth up to 400KHz for CD-ROM.
. Defect and Blank detection circuits
. Dual automatic laser power control circuits with programmable level of LD monitor voltage.
. Vref-1.4V voltage and V2ref=2.8V voltage generators.
. V20=2.0V voltage for pick-up head reference.
. Bi-directional serial port to access internal registers.
. 128-pin LQFP
Block Diagram…………………………………..P.3
Pin Assignment and Description………………..P.4-9
Functions
1.) RF Path Description………………….P. 10-13
2.) Servo Signal…………………………..P. 14-17
. Focusing Error
. Central Servo
. Tracking Error
. RFLVL & SBAD (LVL)
3.) ALPC & RFRP ( RF Ripple)………….P. 18
4.) WOBBLE Detection…………………..P. 19
Command Access Timings………………………P. 20
Programmable I/O ………………………………P. 21
Register
1.) Register Map………………………….P. 22-24
2.) Register Description………………….P. 25-50
MT1336 PIN DESCRIPTIONS
Pin Numbers Symbol Type Description
LQFP128
RF Flag interface
23 DEFECT Digital input Flag of bad data output status
RF SIO interface
56
SCLK Digital input RF serial clock input
58 SDEN Digital input RF serial data enable
59 SDATA Digital IO RF serial data IO
60 RST Digital input Reset (active high)
55 XCK16M Digital input 16.9MHz for verification
RF SERVO interface
40 UDGATE Digital input Control signal for DVD-RAM
41 IDGATE Digital input Control signal for DVD-RAM
38 VFO13 Digital input DVD-RAM Header signal
RF
100 DVDA Analog input AC coupled DVD RF signal input A
99 DVDB Analog input AC coupled DVD RF signal input B
98 DVDC Analog input AC coupled DVD RF signal input C
97 DVDD Analog input AC coupled DVD RF signal input D
95 DVDRFIN Analog input AC coupled DVD RF signal input RFIN