Irradio DVD-636, Service Manual

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PIN Symbol Type Description
173 YUV6 Output Video data output bit 6
174 ICE Input,pull down Microcontroller ICE mode enable
175 FS1 output
176 VSYN Inout Vertical sync / GPIO16
177 YUV7 Output Video data output bit 7
178 DVSS Ground Ground
179 HSYN Inout Horizontal sync / GPIO15
182 DVDD2 Power 2.5V power
185 DVDD3 Power 3.3 power
186 XTALO Output Crystal output
187 XTALI Input Crystal input,27MHz
188 PRST Input,pull down Power on reset input, active high
189 DVSS Ground Ground
195 SDATA Output RF serial data input
196 SDEN Output RF serial data latch enable
197 SLCK Output RF serial clock output
198 BDO Input,pull down Flag of defect data status input
199 ADCVSS Ground Ground
200 ADIN Analog input General A/D input
202 TEZISLV Analog input Tracking error zero crossing low pass input
203 TEI Analog input Tracking error input
204 CSO Analog input Central servo input
205 FEI Analog input Focus error input
206 RFLEVEL Analog input Sub beam add input or RFRP low pass input
207 RFRP_DC Analog input RF ripple detect input
208 RFRP_AC Analog input RF ripple detect input (through AC coupling)
209 HRFZC Analog input High frequency RF ripple zero crossing
210 PWMVREF Analog input A reference voltage input for PWM circuitry.A typical value of 2.8v
211 PWM2VREF Analog input A reference voltage input for PWM circuitry.A typical value of 1.4v
212 ADCVDD3 Power 3.3V power
215 RFIN Analog input Negative input of RF differential signal
216 RFIP Analog input Positive input of RF differential signal
MT1336
GENERAL DESCRIPTION
MT1336 is a high performance CMOS analog front-end IC for both CD_ROM driver up to 48xs and DVD-ROM driver up
to 16xs. It also supports DVD-RAM read up to 4xs Version 2. It contains servo amplifiers to generate focusing error,
3-beam tracking error, 1 beam radial push-pull signal, RF level and SBAD for servo functions. It also includes DPD
tracking error signal for DVD_ROM application. For DVD-RAM disks, there are also Differential Push-Pull (DPP) method
for generating tracking signal and Differential Astigmatic Detection (DAD) for processing focusing signal. Programmable
equalizer and AGC circuits are also incorporated in this chip to optimize read channel performance. In addition, this chip
has dual automatic laser power control circuits for DVD-ROM (DVD-RAM) and CD-ROM seperately and reference
voltage generators to reduce external components. Programmable functions are implemented by the access of internal
register through bi-directional serial port to configure modes selection.
FEATURES
. RF equalizer with programmable f
c
from 3MHz to 70MHz and programmable boost from 3db to 13db.
. MT1336 supports at least eight different kinds of pick-up heads with versatile input configuration for both RF input stages
and servo signal blocks.
. Versatile on-line AGC.
. 3 beams tracking error signal generator for CD_ROM application.
. One beam differential phase tracking error (DPD) generator for DVD_ROM application.
. Differential push pull tracking error (DPP) generator for DVD_RAM application.