Philco PH-919 Service Manual page 15

. 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
Pin Numbers Symbol
LQFP128
RF Flag interface
23 DEFECT
RF SIO interface
56 SCLK
58 SDEN
59 SDATA
60 RST
55 XCK16M
RF SERVO interface
40 UDGATE
41 IDGATE
38 VFO13
RF
100 DVDA
99 DVDB
98 DVDC
97 DVDD
95 DVDRFIN
MT1336 PIN DESCRIPTIONS
Type Description
Digital input Flag of bad data output status
Digital input RF serial clock input
Digital input RF serial data enable
Digital IO RF serial data IO
Digital input Reset (active high)
Digital input 16.9MHz for verification
Digital input Control signal for DVD-RAM
Digital input Control signal for DVD-RAM
Digital input DVD-RAM Header signal
Analog input AC coupled DVD RF signal input A
Analog input AC coupled DVD RF signal input B
Analog input AC coupled DVD RF signal input C
Analog input AC coupled DVD RF signal input D
Analog input AC coupled DVD RF signal input RFIN
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