BBK ABS535T Service Manual

Principle and Maintenance of ABS535T

CONTENTS

Chapter I Overview of ABS535T

1、Description of Functions 2、Block Diagram of Player 3、Composition of IC for Player

Chapter II Operating Principle of Servo Circuit

1、Processing Procedure of Digital Signal 2、Processing Procedure of Control Signal

Chapter III Operating Principle of Decoding Circuit

1、Control Circuit of System 2、Audio and Video Output Circuit

Chapter IV Operating Principle of Power Board

1、Block Diagram 2、Operating Principle of Circuits

Chapter V Operating Principle of Panel

1. Operating Principle

Chapter VI Troubleshooting

Appendix: Functions of IC Pins

Important prompt: This type player employs two kinds of decks, SF-HD62 and SF-HD60, and corresponding software of these two types of decks are different, therefore please pay special attention during deck changing in the maintenance. Corresponding decks should be changed with the same type of original ones, otherwise the player will be out of order. Identification of decks is shown as figures:

SF-HD62

SF-HD60

Operating Principle Analysis of ABS535T

Chapter I Overview of ABS535T

ABS535T is a medium- low-grade model integrating with video disc and power amplifier, with the following major features:

1. The layer adopts “Sanyo loader+MT1389” solution;

2. The power amplifier adopts the digital power amplification circuit, with the power IC of TAS5112DFD; it has low distortion level;

3. The audio process adopts TAS5508 , with high integration and high performance and price ratio;

4. It has the function of radio reception, and the tuner adopts Sanzhenxing DTS-44K（CE）module;

5. The power supply adopts the switching power, with compactness, high efficiency and stable performance;

6. Equipped with SCART（CVBS/RGB）port;

7. Accessory channel input/output function;

8. Headphone output function;

9. Karaoke and automatic accompaniment function

10. “RDS” function;

focus

track

power

VGA

II. Block Diagram of ABS535T Complete Player and IC Function Table:

29LV160BE

16M ROM

Sany deck

main

BA5954

feed

load

Servo

load drive

Power

Radio reception head

MT1389

MPEG decoder

Digital signal

Digital servo

SDRAM

Figure 1

AT24C02

status

4340，7265

Audio D/A，

HCU04

Panel

Refor

AV output circuit

Progressive

composite

Y/Cb/Cr

fiber,

Y/Pb/Pr

S terminal

6-way

III. Function Table of ICs for ABS535T

Circuit

Board

Deck 　 Sanyo Pick-up of disc signal

Main

Board

No Name Function

RF signal processing, digital signal

U201 MT1389

U202 AT24C02 Series EEPROM, status memory U205 HCU04 Hex inverter U209 LM1117MP-1.8 1.8v voltage -regulated power supply U211 AE45164016 64Mbit SDRAM U214 29LV160BE 16Mbit FLASH ROM U302 D5954 4-channel servo driver circuit

processing, servo processing, MPEG

decoding, line scan, system control

Panel

Power

Board

Amplifier board

N102 SD16311 Panel control, VFD display drive N103 REMOT Remote receptor

U501　 U502 HS817 Photo-electric coupler U503 HA17431 2.5V reference voltage comparator

U11 LM7805

U505 0880 Switching power circuit U506 HS817 Photo-electric coupler U507 LM431 2.5V reference voltage comparator

N12 5508 Digital signal processing

N13/14 5112 Power amplification

N8/9 TLV272 Operational amplification

N10/11 RC4580 Digital signal amplification

0380 Switching power circuit

5V 3-terminal voltage -regulated

power supply

Chapter II Operating Principle of Servo Circuit

I. Digital Signal Processing Procedure

ABS535T adopts Sanyo double beam super error correction deck and MTK decoding solution, and its servo circuit mainly consists of preposition signal processing, digital servo processing, digital signal processing IC MT1389 a nd driver circuit BA5954. MT1389 is also a main part of the decoding circuit. The A, B, C, D, E, F, SA, SB and RFO signal transmitted from the deck are mainly inputted

through the 2-13 pins of MT1389, and after amplifying treatment of built-in amplifier of MT 1389, the signals are treated in two parts within MT1389:

After being processed by the internal digital servo signal circuit of MT1389, part of the signal forms into corresponding servo control signal, and output focus (FOSO), tracking (TRSO), main shaft (DMSO) and feed (FMSO) servo control signal from the P42, P41, P37 and P38 of MT1389 and send them to the driver circuit BA5954 to amplify the drive. After drive amplification, the signals will drive the focus coil, tracking coil, main shaft motor and feed motor. The focus and tracking servo s will be used to adjust the object lens and enable laser beam to identify signal from compact disc correctly; the feed servo will be used to drive the laser head to move longitudinally, and scan the compact disc; the main shaft servo is used to control the main shaft motor to read the signals in constant linear speed and drive the disc to rotate.

After being processed by the internal VGA voltage-controlled amplifier of MT1389 in amplification and balance frequency compensation; another part of the signals is converted into digital signal by the internal A/D converter. When the deck reads the CD/VCD signals, these signals will be EFM demodulated in MT1389, and after accomplishing CIRC error regulation in internal MT1389, output to the next grade to carry out audio and video decoding; when the deck reads the DVD signals, these signals will be ESM demodulated in MT1389, and after accomplishing RSPC error regulation in internal MT1389, output to the next grade to carry out audio and video decoding.

II. Processing Procedure of Control Signal

1. Automatic control of laser power, with the circuit shown as the Figure II:

Figure II

MT1389 is integrated with APC (automatic light power control) circuit. Its Pin 20 is the pin for inputting VCD laser power rate detection signal, the Pin 21 is the pin for inputting DVD laser power rate detection signal, and the Pin 23 is the pin for outputting VCD laser power rate drive control. When the Pin 23 finds that the laser output power rat e is too strong, the output voltage on Pin 23 will increase after the processing of internal circuit of MT1389, and then the conduction degree of V302 (2SB1132) and the voltage on its integration polar will decrease, which consequently lead to the decrease of voltage supplied to the laser tube, the weakening of laser head lighting, and thus achieve the automatic adjustment on laser output power. The Pin 22 is the pin for outputting DVD laser power drive control, with the specific control procedure similar to that of VCD.

2. The tray open/close control circuit is shown as the Figure III:

Figure III

Different from the circuit in former MTK solution, the MT1389 is integrated with preposition signal processing circuit, so the tray open/close control signals are accomplished by MT1389, that is to say, the close control signal is accomplished by the Pin 51 of MT1389, while the open control signal by Pin 39 of MT1389.

When we press the open button, the Pin 51 of MT1389 is in high power level, while the Pin 39 is in low power level, and then the triode V308 will be on-state. Through resistor R323, the base of V306 will be made to be in low power level, and V306 will be on-state, with the current direction as the following figure:

Power voltage VCC ? V306E-C junction ? motor negative terminal LOAD- ? motor positive Load +? V308 C-E junction ? grounding

So the motor will rotate clockwise to accomplish the action of tray closing. When we press the open button, the Pin 51 of MT1389 is in low power level, while the Pin 39 is in high power level, and then the triode V307 will be conducted. Through resistor R324, the base of V309 will be made to be in low power level, and V309 will be conducted, with the current direction as the following figure:

Power voltage VCC ? V309E-C junction ? motor negative terminal LOAD- ? motor positive Load +? V307 C-E junction? grounding

So the motor will rotate anti-clockwise to accomplish the action of tray opening.

3. The main shaft motor braking circuit is as the Figure IV: To prolong the lifespan of motor and reduce the influence of start-up impact current, with the

installation of disc, our R&D personnel design the main shaft motor to be in the state of constant operation, so that even if the STOP button is pressed, the disc will not be stopped. Therefore, when we press the OPEN button, a braking signal is required to stop the rotation of main shaft motor immediately to accomplish the opening action in a short time.

Figure IV During playing, if we press the OPEN button, the main shaft drive signal will disappear, and

because of inertia, the main shaft motor is still in operation. As the electromotive force generated in the operation of motor receives the induction voltage on sampling resistors R321 and R340, which, through the resistor R319 and R320, is added to the Pin 36 and Pin 35 of MT1389, and outputted from the Pin 34 after internal processing for amplification in MT1389, and delivered to Pin 47 of MT1389 through R318. After the internal A/D conversion and corresponding processing, an instant motor reversal braking signal will be outputted from the Pin 37 of MT1389 to stop the rotation of main shaft motor immediately, so as to ensure the standstill of the disc when opening the player.

III. Servo drive circuit

The servo drive of the player is accomplished through a piece of 4-channel dedicated drive circuit BA5954, with the circuit as Figure V:

The 4 servo control signals generated in digital servo circuit processing of MT1389, i.e. focusing control FOSO, tracking control TRSO, feed contro l FMSO and main shaft control DMSO signals, are added to the pins 1, 26, 23 and 5 of BA5954 respectively, and after drive amplification of BA5954, the focusing and tracking drive signals will be outputted from the pins 13 and 14 and pins 15 and 16 of BA5954 respectively, and added to the focusing and tracking coils to drive the light head to accomplish the actions of focusing and tracking.

The feed and main shaft drive signals will be outputted from the pins 17 and 18 and pins 11 and 12 of BA5954 respective ly, and added to the feed motor and main shaft motor to drive the light head to move longitudinally and enable the disc to rotate in constant linear speed.

The STBY on Pin 28 of BA5954 is an output-enabling signal, and only when the pin is in high power level, there will be output of drive voltage on the output terminal.

Chapter III Operating Principle of Decoding Circuit

The decoding circuit of the player mainly consists of decoding chips (including MT1389, SDRAM AE45164016 and FLASH ROM 29LV160BE) and audio DAC CS4360.

I. Control Circuit of System

1. Reset circuit is as the Figure VI:

Figure VI

The reset circuit of the player consists of triode Q204 9014, reset capacitor TC 217 100uF/16V and phase inverter U205 HCU04. In starting up, as the terminal voltage of capacitor cannot be changed suddenly, the basic of Q204 is in low power level. After the cut-off of Q204, its emission polar is in low power level, after secondary phase inversion by U205 and regulation, the low power level reset signal is outputted to the Pin 110 of MT1389 to reset MT 1389.

When the recharging of TC217 is finished, the base of Q204 will be in high power level, Q204 will be conducted, and the emission polar is in high power level. After the secondary phase inversion and regulation by U205, a high power level is outputted and added to the Pin 110 of MT1389 to maintain high power level during its normal operation.

2. Clock circuit

The crystal oscillator of X201 27MHz, C275/27PF, C276/27PF and phase inverter HCU04 form into clock oscillation circuit, and the clock signals generated are added to the pins 229 and 228 of MT1389 through R244 and 4248 to provide operating clock for MT1389.

3. Data communication circuit

The data communication circuit of the player consists of decoding chip MT1389, SDRAM, AE45164016 and FLASH ROM 29LV160BE, as the Figure VII:

MT1389 is a piece of super large integrated circuit, with the operation voltage of +3.3V and +1.8V. Its functions include: RF small signal preposition processing, digital servo, digital signal processing and accomplishing MPEG decoding and video coding. The built-in MCU of MT1389 is

also the system control circuit of the whole player.

39 38 37 18 17 19 16 20 21

26 28 11 15 47 79 66 VD

AE45164016 is a piece of 4M*16bit large capacity SDRAM, with the operation voltage of +3.3 V. In DV971, the 6ns module is adopted, with high speed and the maximum operation frequency up to 166MHz. Its main function is for operation buffer storage of decoding chip MT1389 to store the audio and video data stream in decoding.

29LV160BE is a piece of 16Mbit FLASH ROM, with the operation voltage of +3.3V, mainly for storing the user’s information including OSD character information, operational microcode and LOGO in start-up.

RY/BY

29LV160BE

BYTE

GND

A0—A21

AD0—AD7

DCE

DRD

DWR

Figure VII

MT1389

DMA0—DMA11

DQ0—DQ15

113 137 156 157 140 139 142 138 145 143

AE45164016

DQML

DQMH CLK

CKE RAS CAS CS

WE BA1 BA0

II. Audio and Video Output Circuit

1. Video output circuit

ABS535T can not only output three types of alternating-line video signal (including CVBS composite video, S terminal Y-C signal and Y/Cb/Cr color difference signal), but also output two types of progressive line video signal (including Y/Pb/Pr progressive line color difference signal and VGA progressive line signal).

The decoding chip MT1389 has built-in video encoding circuit for direct output of analogue composite video signal CVBS, S terminal, color difference signal and VGA signal.

The CVBS composite video signal is outputted from the Pin 198 of MT1389, the S terminal signal Y-C is outputted from the pins 194 and 196 of MT1389, the color difference signal and the R-B-G signal of VGA port is outputted from the pins 203, 202 and 200 of MT1389, the row and field synchronization signals of VGA port are outputted from the pins 207 and 205 of MT1389 respectively.

To mention specifically, the alternating-line color difference signal, the progressive line color difference signal and progressive line R-B-G signal are outputted from the same pin, therefore the signal output shall be selected according to the ports of TV, otherwise there will be only sound but without picture display.

2. Audio output circuit

Audio signals processed by MT1389 output 5-track data signals through pin 217, pin 218 and pin 219 and 5-channel clock signals through pin 214 and pin 215. These signals after passing through

IC 74HCT125 are transmitted to audio signal processing IC TAS5508 to be processed (specific IC data please refer to Attachment), then 10 groups of PWM signals are output, six of which are transmitted to power amplifying parts, two of which to headphone output and two of which to auxiliary channel output.

Six groups of signals transmitted to power amplifying IC are processed by surrounding and super DBB sharing an N13 IC TAS5508, and by main sound channel and center sharing an N14 IC TAS5508. Signals are amplified here, for they are digital high frequency signals, they have high efficiency; meanwhile power IC has low colorific value. Amplified signals are still digital signals, in order that they can be output through loudspeaker, amplified digital signals still have to be processed before outputting.

For PWM signals containing audio signals, since high frequency signals have high frequency and are beyond audibility range of human ears, we can ignore impacts of high frequency signals and reduce low frequency audio signals only during processing.

TAS5508 is an 8-channel pulse width modulated high performance IC, and applicable in processing most digital audio signals. Between 20Hz and 20KHz, it has excellent noise factor and dynamic range. It has following features:

1、 Automatically control clock speed and digital sampling speed; 2、 8 groups of audio input channels; 3、 8 groups of PWM output can be changed into 6-channel stereo line output or 8-channel

line output;

4、 Line output is a different input open loop amplifier driven by a group of PWM signals.

IC TAS5112 is a high performance audio power amplifier. Bridging with 6O loading, each c hannel can output 50W. It has 95DB dynamic range, low distortion degree and low rate of heat generation with power efficiency up to 90%. It also has functions of low-voltage protection, high-temperature protection, overflow protection, etc. At the same time, it has built-in driving power adjustment gate circuit. It is applicable in family video, DVD receiver, mini music center, etc. Detailed IC introduction see Attachment.

When in normal disc reading, digital signals and clock signals from 1389 are transmitted to pin 26 to pin 31 of IC TAS5508 through IC 74HCT125 gating. If no headphone is inserted, PH-SEL is of high level, as well as when MUTE is normal. And pin 37 of TAS5508 is also of high level. All data lines and clock lines can be detected by oscilloscope. One group of signals from 5508 is transmitted to N8 and N9, then output through auxiliary channel. Another group is transmitted to headphone; other PWM signals are transmitted to amplifying parts of amplifier. When headphone is inserted, PH-SEL signal is forcibly shorted to earth, and turns to low level, meanwhile amplifier is muted. This amplifier has functions of radio reception, auxiliary channel output and karaoke. All external inputs after N3 CD4052 gating and N7 CS5340 analog-to-digital conversion are transmitted to MT1389. Rear processing and output is the same as the signal output flow in normal disc reading. When in disc reading, system defaults to gate karaoke input, therefore you can open karaoke when playing disc. This amplifier also has automatic accompaniment function, when playing VCD, system detects external input and automatically screen to human sound signal in the disc, while only saves sound accompaniment. ABS535T has the function of radio reception, and can also receive RDS signal. The radio head control lines CE, DI, CL and DO are controlled by 28 array lines connecting to MT1389 control.

When any of the controlling lines is in abnormality, the radio reception will be in malfunction. The RDS signal received by radio head will be delivered to the dedicated IC SAA6588 for processing.

Chapter IV Operating Principle of Power Board

I. Block Diagram

This amplifier has two groups of power supply; one is of low voltage for decoding board and low power ICS, the other is of higher voltage fo r power amplifying IC. But their design principles, we only draw one functional block diagram of them:

II. Introduction of Circuit Principle

220V alternating current is loaded on D501-D504 integrated bridging rectification circuit through power plug, fuse tube, voltage dependent resistor R501 and common mode rejection BC501 and L501. Diode adopts IN4007 which ahs better PPR and higher withstand voltage value than IN4001. Output 311V direct current after being bridging rectified is loaded on two transformers through TC501 filtering and transmitted to DRAIN control pins of switch modules U501 and U502. Service voltage of power on IC after being directly rectified and filtered is divided by resistors to serve IC. Diode D508, capacitor C516 and resistor R516 form absorption circuit to provide discharge circuit of reverse electromotive force for 1-4 coils of transformers. Pin FB controlling IC is feedback control pin, so you should decide on/off time of pulse width according to current intensity on it to ensure stability of output voltage. There are 5 branch circuits coupled to sub -grade through transformer.

1. Voltage output from pin 11 and pin 13 of transformer T501 outputs a group of +28V voltage

for power amplifying IC after being rectified and filtered.

2. Voltage output from pin 16 of transformer T501 outputs a group of +12V voltage after being

rectified and filtered. +12V voltage is stabilized into a group of +5V voltage by IC LM7805.

3. Voltage output from pin 14 of transformer T501 outputs +5V voltage and provide voltage for

one end of photo-electric coupler U502 after being rectified and filtered.

4. Voltage output from pin 12 of transformer T501 outputs +3.3V voltage and provide a group of

stable voltage for CPU after being rectified and filtered.

5. Voltage output fr om pin 9 of transformer T501 outputs a group of 21V voltage for displaying

driving IC after being rectified and filtered. Clamp ZD501 of -21V provide heater voltage for panel display screen. Grounding direct voltage of FL+ and FL- is about -16V.

Operating principles of two groups of switch power are the same, therefore we will only analyze the group providing +3.3V voltage for CPU here: Feedback sampling of this group comes from 3.3V and supplies for photocupler HS817 through D516 and R506. At the same time, it is divided through R508 and R509 for reference voltage pin R of 2.5V comparator. When 3.3V becomes higher, pin KA of comparator is on; and the voltage is transmitted to pin 4 of switch IC 5L0380R after photoelectric coupling through HS817 to reduce on time of internal switch tube. And thus it reduces transformer coupling and decreases output of

3.3V voltage to achieve automatic adjustment and control, and vice verse.

It has to be noted that in this switching power reference voltage comparator IC of two groups of switching power are different. For voltage of the group supplying power for amplifier is higher, it adopts LM431 which has better performance and higher withstand voltage. And voltage of the

group supplying power for 3.3V is lower, it adopts 17431. For two ICs are different, you should

ＶＦＤ４０１　ｉｓ　ａ　ｖａｃｕｕｍ　ｆｌｕｏｒｅｓｃｅｎｃｅ　ｓｃｒｅｅｎ，　ａｎｄ　ｉｔｓ　ｂｉｇｇｅｓｔ　ｆｅａｔｕｒｅ　ｉｓ　ｉｔｓ　ｈｉｇｈ　ｂｒｉｇｈｔｎｅｓｓ．　

U401

IC D16311

pay special attention to distinguish them from each other. They cannot be used mixing.

Chapter 5: Panel control and VFD display circuit

The panel mainly consists of VFD screen, driver ICD16311, remote receptor HS 0038A2 and

button and indicator display circuit, mainly for accomplishing man-player dialogue and display of operation status.

The structural drawing is as follows:

Keystroke

VFD

display

control

VFDST VFDCK VFDAT

U201

MT1389

Panel indicator control

Remote

receiving

Figure XI

MT1389 will control the U401 IC D16311 to display the operation status of the player through the VFDST status, VFDCK clock and VFDAT data, under the control of CPU built in MT1389, receive the user control commands sent by D16311, and control the controlled circuit of the player to limit the player to operate in specified status.

When the user operate s the panel buttons, the control command is sent to the IC D16311 through keyboard-scanning circuit, and through internal decoding drive, the IC D16311 outputs the control data from the pins 5 and 6 (VFDAT) to the built-in CPU of MT1389, which will realize the control on the controlled circuit, and control the VFD through IC D16311.

Its operation principle is similar to the kinescope of TV. The pins 1, 2, 34 and 35 are for filament power supply; the pins 27-32 are GRID poles, each GRID has 16 different characters of display; the pins 4-19 are SEG poles, and the CPU control the SEG poles through its control on IC D16311, and display the char acters of corresponding operation status on the screen.

The remote reception circuit mainly consists of remote receptors HS0038A2, of which the pin 1 is for grounding, the pin 2 for power supply, the pin 3 for output of reception signal, and they are all connected directly to the CPU in MT1389 to control the corresponding circuit.

This player has headphone output function. A pin in the headphone directly connects to TAS5508. When the headphone is inserted, detection line H-DET grounds and turns into low le vel. When pin 12 of TAS5508 turns

into low level, parts of output of amplifier are muted. When in normal condition, this detection pin is of high level around 3.3V.

Troubleshooting

I. Voltage on key points of ABS535T

Demoding circuit: Reset:

1. U205 (HCU04): 8 pins, around 5V;

2. MT1389: 110 pins, around 5V;

3. FLAHS ROM: 12 pins, around 5V

Clock: 27MHZ crystal oscillator two ends: Around 0.77V.

I2C bus SDA: 3.3V I2C bus SCL 3.3V

Servo circuit: LD01： 3.3V；LD02：3.3V V301 and V302 electron collector LD voltage: 2.3V BA5954 pin 4 base voltage: 1.4V BA5954 pins 15 and 16 tracking drive output: Around 2.5V BA5954 pins 17 and 18 feed drive output: Around 2.5V BA5954 pins 13 and 14 focus drive signal output : Around 2.5V BA5954 pins 11 and 12 main shaft drive output: Around 2.5V BA5954 pin 1 focus control signal input: 1.4V BA5954 pin 5 main shaft control signal input: 1.4V BA5954 pin 26 tracking control signal input: 1.4V BA5954 pin 23 feed control signal input: 1.4V

Amplifier circuit： TAS5508 pin 9 power supply pin 3.3V

TAS5112 32、33、40、41、44、45、52、53, 28V。\

display

Check if power supply of MT1389

Check the voltage of power board,

, C275,

Q204 etc.

SDA, SCL 3.3V

short

R260

, CAS,

f FLASH ROM, URST, DCE,

Check if the connection between

II. Troubleshooting of main troubles

picture, no sound, no VFD

3.3V, 1.8V is right?

YES

If the clock signal output XO and XI is right?

YES

Check if reset signal URST#

in 5V high level?

YES

Check if I2C bus, voltage is right?

and check if the decoding board short circuit to the grounding.

Check if clock oscillating circuit 27M crystal oscillator C276, R224, R248 are damaged?

Check if the reset circuit which i comprised by HCU04 and is in working order?

Check if the AT24C16, CS4360, MT1389 SDA and SCL are circuit to grounding, if R259 and are in working order?

Check if SDRAM CLK, CS, RAS WE communication signals are right?

MT1389, FLASH, SDRAM is right?

Check i DRD, DWR signals are right?

Check if the MT1389, SDRAM and FLASH are damaged?

laser

feed control

23 is

17,18

the power

Check if laser head

control

voltage output of

and 14 are

coil and its

Check if BA5854 and 5V power

Do not read disc

Check if the

head has feed action.

Check if the input of BA5954 Pin

1.4V?

YES

Check if the connection from BA5954 to MT1389 is open circuit ?

YES

has focus action?

YES

Check if the

BA5954 pin 13

Check if BA5954 pin have 2.5V voltage output?

Check if BA5854 and supply 5V are in working order ?

Check if BA5954 pin

has focus voltage input of 1.4V.

Check focus connection.

2.5V?

Check feed motor and its connection.

Check if the connection from BA5954 to MT1389 is open circuit ?

YES NO

supply are in working order ?

Check MT1389 and its

eck if V301 and V302

electron collector voltage is

Check if the laser head

and its array line are

Check if the connection from

89 is open

main shaft

Check if MT1389

peripheral

Check if BA5854 and 5V power

Check if there is

laser coming out from laser head?

Check if the signal voltage of LD01, LD02 is 3.2V?

YES

connection.

YES YES

Check if the

main shaft rotates?

YES

2.3V?

Check if the control voltage of BA5954 pin main shaft is 1.4V?

Check if BA5954 pin and 12 output is 2.5V?

right?

BA5954 to MT13 circuit?

Check if BA5954 or motor is damaged?

and its circuit is right?

supply are in working order?

Attachment ：Brief Introduction to IC Pins

I. MT1389

MT1389 adopts the LQFP 256 pin packaging and 3.3V/1.8V double voltage operation mode. It is a piece of large-scale CD-ROM and DVD-ROM preposition processing CMOS integrated circuit with excellent performance, and a single chip dedicated to CD/VCD/DVD player. It contains focusing servo error amplification, tracking servo error amplification and RF level output servo control, including the following main functions:

RF small signal preposition processing, mainly for carrying our corresponding processing and amplification on the RF signals transmitted from the light head part, adjusting the laser output power automatically, and identifying the VCD disc and DVD disc.

Digital servo processing can generate focusing, tracking, feed and main shaft servo control signals; digital signal processing, accomplishing the EFM/EFM + demodulating of RF signals.

MPEG-1/MPEG-2/MPEG4/JPEG Video decoding chip, which can not only realize the decoding of VCD and DVD, but also realize MPEG 4 network video decoding, being compatible to “network movie” disc, and decipher JPED pictures to realize the function of digital photo album play.

On audio aspect, it can not only realize AC-3/DTS double decoding, decipher MP3, and is also compatible to DVD-Audio decoding to achieve high-resolution sound restoration in 1000 times higher than CD.

By utilizing the 8032 microprocessor with built-in chip, MT1369E can also realize the system control function of player, which simplifies the circuit design substantially.

The pin functions of MT1389 are as the following table:

Pin Name Function

1 AGND Analogue grounding

2 DVDA

3 DVDB

4 DVDC

5 DVDD