PHILIPS TDA1302T Data ampli er laser supply circuit for CD player read only optical systems handbook
Contents
1. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT Supply IDD amplifier supply current laser OFF 8 _ mA Vpp amplifier supply voltage 3 4 _ 5 5 V VppL laser control supply voltage 2 5 _ 5 5 V Puiss power dissipation laser OFF Vpp 3 4 V 27 _ mW Diode current amplifiers 1 to 6 lid diode input current note 1 _ 10 uA Neq equivalent noise input 1 pA VHz Vid diode input voltage lia 1 67 pA _ 0 9 _ V Vo d diode output voltage 0 2 _ Vpp 1 V Gan amplification lia 1 67 pA 1 43 1 55 1 67 dB Vo an 0 V note 2 los a diode output offset current lesin ltsin 0 note 3 100 nA Zod output impedance lgi 1 67 HA Vora 0 V 500 _ _ kQ B 3 dB bandwidth lia 1 67 pA 50 68 _ kHz Gmm mismatch in amplification lai 1 67 uA T 3 Volan Vo dm September 1994 7 P TDA1302_1 8 Wed Sep 14 13 30 56 1994 Philips Semiconductors Preliminary specification Data amplifier and laser supply circuit for TDA1302T CD player and read only optical systems SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT Data amplifier equalized single and double speed VrRFo DC output voltage lesin 0 0 3 _ V RRF transresistance fi 100 kHz note 4 100 120 143 kQ fi 100 kHz note 5 200 240 285 kQ VRFMO output voltage note 6 _ _ Vpp 1 2 V SRp2. voltage dip control over the laser diode current thus resulting in a e Optimized interconnectiion between pick up detector constant light output power which is independent of and digital servo processor TDA1301T ageing The IC is mounted in a small outline package to e Wide supply voltage range enable it to be mounted close to the laser pick up unit on e Wide temperature range the sledge e Low power consumption QUICK REFERENCE DATA SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT Vpp supply voltage pin 18 3 4 _ 5 5 V Diode current amplifiers Gan amplification 1 55 dB los d diode output offset current 100 nA B 3 dB bandwidth lia 1 67 WA 50 kHz RFE amplifier built in equalizer ta eq equalization delay fi 0 3 MHz 320 ns tar flatness delay double speed 5 ns Laser supply low output current Vpp 3 V _ _ 100 mA ORDERING INFORMATION PACKAGE TYPE NUMBER NAME DESCRIPTION VERSION TDA1302T SO24 plastic small outline package 24 leads body width 7 5 mm SOT137 1 September 1994 2 ed q9 40 wesbeip oeweyos 1 64 Preliminary specification TDA1302T abpas 669VN Z0L ZL0ZVG1 10 0N 20 yal 3I1dWV Ippo 33M0d 10 0N 20 snooj yoyims do s pu S AW1dS10 AY Se 2 q a YVOBAIY J z oO GND ray 19 1004 aD os JO OUU gt 9 lpujds J po5 g 101 U0 9 2 0
3. ee TDA1302T TDA1301T D5 VoD lt i gt 1 red gt JX L K D3 gt Xe hep ithe o al Se aaa aquy ss ass MKA708 Fig 10 Application of the CDM12 pick up unit September 1994 13 P TDA1302_1 Philips Semiconductors 14 Wed Sep 14 13 30 56 1994 Data amplifier and laser supply circuit for CD player and read only optical systems Application of other mechanisms The TDA1302T can accommodate all laser monitor configurations with an N sub laser diode When an N sub monitor diode is used external circuitry is required as illustrated in Figs 11 a to 11 d Most of these laser monitor diode units have a variable resistor Rm in parallel with the monitor diode which has been pre adjusted so that the voltage drop across this resistor has a specific value at nominal laser diode output power The four circuits given each detail specific values for some frequently used pick up units as given in Table 3 Each Preliminary specification TDA1302T Table 3 Pick up units SUAT MANUFACTURER APPLICATION SLD104U Sony corporation KSM210 Sony LT022MS Sharp corporation KSM210 Sony RLD 78MA Rohm corporation KSM210 Sony HOP M3TR Hitachi SF91 Sony corporation CDV90V1 Sanyo circuit has its own advantages All circuits illustrated make use of the fixed voltage lt 200 mV across the built in monitor resistor EMONITO
4. 19 Wed Sep 14 13 30 56 1994 Philips Semiconductors Data amplifier and laser supply circuit for Preliminary specification TDA1302T CD player and read only optical systems SOLDERING Plastic small outline packages BY WAVE During placement and before soldering the component must be fixed with a droplet of adhesive After curing the adhesive the component can be soldered The adhesive can be applied by screen printing pin transfer or syringe dispensing Maximum permissible solder temperature is 260 C and maximum duration of package immersion in solder bath is 10 s if allowed to cool to less than 150 C within 6 s Typical dwell time is 4 s at 250 C A modified wave soldering technique is recommended using two solder waves dual wave in which a turbulent wave with high upward pressure is followed by a smooth laminar wave Using a mildly activated flux eliminates the need for removal of corrosive residues in most applications BY SOLDER PASTE REFLOW Reflow soldering requires the solder paste a suspension of fine solder particles flux and binding agent to be DEFINITIONS applied to the substrate by screen printing stencilling or pressure syringe dispensing before device placement Several techniques exist for reflowing for example thermal conduction by heated belt infrared and vapour phase reflow Dwell times vary between 50 and 300 s according to method Typical reflow temperatures range from 215 to
5. laser diode monitor diode chain the safety of the laser diode completely relies on the quality of this external circuitry Therefore it should be noted that 1 If such a circuit requires a supply voltage make sure that this voltage is present at least at the same moment as Vpp_ or earlier 2 Itis advised not to implement integrating actions in this external circuitry as this may conflict with the internal integrator especially during possible supply voltage drops MEASUREMENT OF THE LASER DIODE CURRENT It is advised not to connect any current meter directly in series with the laser diode A safe method is the inclusion of a 1 Q resistor connected in series with the laser diode and measuring the voltage across this resistor September 1994 17 TDA1302_1 18 Wed Sep 14 13 30 56 1994 P Philips Semiconductors Data amplifier and laser supply circuit for CD player and read only optical systems PACKAGE OUTLINE Preliminary specification TDA1302T l 24 13 NZ 3 S 2 a gt pin 1 7 index 1 12 Dimensions in mm A i Y 14 245 o3 y poa sl 225 O 01 og 235 t t a i J 14 4 0 5 lt 0 to 8 detail A MBC235 1 Fig 14 Plastic small outline package 24 leads body width 7 5 mm SO24L SOT137AH September 1994 18 TDA1302_1
6. O 0 TDA1302TY OO TDA1302_1 2 Wed Sep 14 13 30 56 1994 Philips Semiconductors Preliminary specification Data amplifier and laser supply circuit for CD player and read only optical systems TDA1302T FEATURES GENERAL DESCRIPTION Six input buffer amplifiers with low pass filtering andwith The TDA1302T is a data amplifier and laser supply circuit virtually no offset for three beam pick up detectors applied in a wide range of mechanisms for Compact Disc and read only optical systems The device contains 6 amplifiers which amplify and filter the focus and radial diode signals and provides an equalized RF signal suitable for single or double speed Fully automatic laser control including stabilization and mode the mode can be switched by means of the speed HF data amplifier with a high or low gain mode Two built in equalizers for single or double speed mode ensuring high performance in both modes an ON OFF switch plus a separate supply Vpop for control pin The device can accommodate astigmatic power reduction single foucault and double foucault detectors and can be e Adjustable laser bandwidth and laser switch on current Applied to all N sub laser monitor diode units even though slope the circuit has been optimized for the Philips CDM12 mechanisms and the digital servo controller TDA1301T After a single initial adjustment the circuit will maintain Protection circuit to prevent laser damage due to supply
7. Increasing the supply voltage to Vpp 5 V increases the maximum input current see also Figs 4 and 5 The gain increases if a larger supply voltage is used see also Fig 6 losin is the sum of the diode input currents 1 to 4 ligin is the sum of the diode input currents 5 and 6 Transresistance 120 kQ means LOW gain selected if HG logic 0 see Table 1 Transresistance 240 kQ means HIGH gain selected if HG logic 1 see Table 1 Output voltage swing will be VsaRF VRFMo VRFO p p Refers to equalized output only For single speed the gain ratio is defined as gain difference between 1 MHz and 100 kHz while the flatness delay is defined up to 1 MHz see also Fig 7 For double speed the gain ratio is defined as gain difference between 2 MHz and 200 kHz while the flatness delay is defined up to 2 MHz OOO TOTS GO TO Transfer function The equalized amplifier including Cex and Rex has the following transfer functions where rfe refers to equalized output only and rf refers to equalized and not equalized outputs FOR SINGLE SPEED SP LOGIC 1 V ke2 2 Mec R x 1 ks os 1 1 1 SC Sa rf 2 2 csin 1 1 QXxS O s S os 1 5s 0 1 SRext Coxt FOR DOUBLE SPEED SP LOGIC 0 V 2 2 ate _ py 1 ks os 1 2 f x csin U ape 1 QX 0 4 8 0 od 1 SRoxt X Cont The denominator forms the denominator of a Bessel low pass filter Table 2 Transresistance SYMBOL DESCRIPT
8. apooqns JO OW liogiYyaL 5 2 l OANZS g 1V 11910 D E srezvys 8 4300030 OSSA VSSA adaa vada g Y sapoip ojoud oh 319 me v O s OC lt G G s ag 8 gt tez 2 a E amp E x glooo lt E 2 oO ui OQ O O x o 9 PO6I 9S 0 1 PI deg POM I ZOETVGL TDA1302_1 4 Wed Sep 14 13 30 56 1994 Philips Semiconductors Preliminary specification Data amplifier and laser supply circuit for CD player and read only optical systems TDA1302T BLOCK DIAGRAM photo diodes 7 16 KI Id6out 06 Id5out 05 Id4out 04 f 14 KH VoD Id3out 03 H 13 KH Id2out 02 12 Kt lt p Id tout 01 i 11 KH VDD SUPPLY GND at decoder input ift L L ee i RFE 750 Q Rext 147 pF Cext sail aha UD Ss ope ds TDA1302T pe VDDL loser ode MI LO diode i pi am ADJ LDON oe Cl 1 nF mm MKA700 Fig 2 Block diagram September 1994 4 TDA1302_1 5 Wed Sep 14 13 30 56 1994 Philips Semiconductors Preliminary specification Data amplifier and laser supply circuit for CD player and read only optical systems TORNAR PINNING SYMBOL PIN DESCRIPTION 04 1 output of diode
9. 250 C Preheating is necessary to dry the paste and evaporate the binding agent Preheating duration 45 min at 45 C REPAIRING SOLDERED JOINTS BY HAND HELD SOLDERING IRON OR PULSE HEATED SOLDER TOOL Fix the component by first soldering two diagonally opposite end pins Apply the heating tool to the flat part of the pin only Contact time must be limited to 10 s at up to 300 C When using proper tools all other pins can be soldered in one operation within 2 to 5 s at between 270 and 320 C Pulse heated soldering is not recommended for SO packages For pulse heated solder tool resistance soldering of VSO packages solder is applied to the substrate by dipping or by an extra thick tin lead plating before package placement Data sheet status Objective specification This data sheet contains target or goal specifications for product development Preliminary specification This data sheet contains preliminary data supplementary data may be published later Product specification This data sheet contains final product specifications Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System IEC 134 Stress above one or more of the limiting values may cause permanent damage to the device These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is n
10. current amplifier 4 O6 2 output of diode current amplifier 6 03 3 output of diode current amplifier 3 O1 4 output of diode current amplifier 1 05 5 output of diode current amplifier 5 04 14 02 6 output of diode current amplifier 2 56 g LDON 7 control pin for switching the laser ON and OFF o3 13 VppL 8 laser supply voltage 01 i RFE 9 equalized output voltage of sum signal of amplifiers 1 to 4 05 15 RF 10 unequalized output 02 12 HG 11 control pin for gain switch ae TDA1302T LS 12 control pin for speed switch DD CL 13 external capacitor VpDL MI ADJ 14 reference input normally RFE LO connected to ground via a resistor pb GND 15 0V supply substrate connection RF GND ground HG ADJ LO 16 current output to the laser diode MI 17 laser monitor diode input FS ct Vpp 18 amplifier supply voltage MKA701 12 19 photo detector input 2 central I5 20 photo detector input 5 satellite l1 21 photo detector input 1 central 13 22 photo detector input 3 central I6 23 photo detector input 6 satellite Fig 3 Pin configuration 14 24 photo detector input 4 central September 1994 5 TDA1302_1 6 Wed Sep 14 13 30 56 1994 Philips Semiconductors Data amplifier and laser supply circuit for Preliminary specification TDA1302T CD player and read only optical systems FUNCTIONAL DESCRIPTION The TDA1302T can be divided into two main sections the laser control circuit and the photo diode signal filter and amplifi
11. separate supply voltage VppL thereby offering the possibility of reduced power consumption by supplying this pin with the minimum voltage necessary It also has a laser diode protection circuit which is enabled prior to the output drive transistor becoming saturated due to a large voltage dip on Vpp Saturation will result in a lower current from the laser diode which is normally followed immediately by an increment of the voltage from the external capacitor CL which could cause damage to the laser diode at the end of the voltage dip The protection circuit prevents an increment of the capacitor voltage and thus offers full protection to the laser diode under these circumstances Photo diode signal filter and amplification section This section has 6 identical current amplifiers Amplifiers 1 to 4 are designed to amplify the focus photo diode signals Each amplifier has two outputs an LF output and an internal RF output Amplifiers 5 and 6 are used for the radial photo diode currents and have only an LF output All 6 output signals are low pass filtered with a corner frequency at 65 kHz The internal RF output signals are summed together and converted into a voltage by means of a selectable transresistance of 120 kO or 240 kQ This signal is available directly at pin 10 however there is also an unfiltered signal available at pin 9 The equalization filter used has 2 different filter curves one for single speed mode and one for double
12. 12 Wed Sep 14 13 30 56 1994 P Philips Semiconductors Preliminary specification Data amplifier and laser supply circuit for TDA1302T CD player and read only optical systems INTERNAL PIN CONFIGURATION LDON is to CL HG and LS circuitry VDD ran VDD VDD T A lei ji eg ae i n H er RFE A MKA706 Fig 8 Equivalent internal pin diagrams September 1994 12 P TDA1302_1 13 Wed Sep 14 13 30 56 1994 Philips Semiconductors Preliminary specification Data amplifier and laser supply circuit for CD player and read only optical systems TDA1302T APPLICATION INFORMATION is optimized for this type besides the standard components CL and Raps no other external components The TDA 1302T is optimized for Philips CDM12 are required as illustrated in Fig 9 mechanisms and subsequently this application is preferred As two central spot diodes are summed together inside the pick up unit one input pin remains unused as shown in Application with Philips CDM12 Fig 10 Unused central spot inputs should be connected to ground in order to eliminate noise contribution to the RF The CDM12 mechanism uses an N sub laser diode and RFE signals together with a P sub monitor diode and since TDA1302T MONITOR DIODE MKA707 Fig 9 Application of the CDM12 laser monitor diode unit
13. F slew rate Vsr 1 V p p 6 _ V us ZoRF output impedance fi 1 MHz _ 100 _ Q ta eq equalization delay note 7 320 ns ta n flatness delay a LS 1 or 0 notes 7 and 8 10 5 ns Gr gain ratio note 8 4 5 6 _ qB Bre unequalized output bandwidth lig 1 67 uA 3 5 MHz Control pins LDON LS and HG with 47 kQ internal pull up resistor Vit LOW level input voltage 0 2 _ 0 5 V Vin HIGH level input voltage Vpp 1 Vpp 0 2 V lit LOW level input current _ 100 uA Laser output Vow output voltage loq 100 mA 0 2 Vpp 0 7 V D lo output current T 100 mA Monitor diode input Vi mon monitor input voltage limon 1 MA Vpp 0 7 V limon monitor input current 2 mA Reference source Vgap and laser adjustment current lapu Vref reference voltage Raps 48 KQ 1 15 1 24 1 31 V AT reference temperature drift Raps 48 KQ _ 40 x 10 6 SRret reference supply rejection _ 1 lapu adjustment current Rapy 5 6 kQ _ _ 200 uA Zi input impedance Rapi 48 kQ 1 _ kQ dio dt slew rate output current CL 1nF _ 1 _ mA us M multiplying factor li mony labu _ 10 _ September 1994 8 TDA1302_1 9 Wed Sep 14 13 30 56 1994 Philips Semiconductors Preliminary specification Data amplifier and laser supply circuit for CD player and read only optical systems TDA1302T Notes to the characteristics 1 The maximum input current is defined as the current in which the gain reaches its minimum
14. ION TYP UNIT k internally defined 4 Mos 1 Moq We internally defined 1 094 Q internally defined 0 691 Ood 2 X Oos internally defined 17 6 x 10 6 rad s RRF see Chapter Characteristics _ Rext external resistor 750 Q Cext external capacitor 47 pF September 1994 9 TDA1302_1 10 Wed Sep 14 13 30 56 1994 Philips Semiconductors Preliminary specification Data amplifier and laser supply circuit for CD player and read only optical systems TDA1302T MKA702 li mox uA 8 tot 1 Pot 1 a ae ee 3 4 4 45 5 0 5 5 Yop V T test limit Fig 4 Maximum input current as a function of Vpp MKA703 test limit l uA Fig 5 Output current as a function of input current September 1994 10 P TDA1302_1 11 Wed Sep 14 13 30 56 1994 Philips Semiconductors Preliminary specification Data amplifier and laser supply circuit for TDA1302T CD player and read only optical systems MKA704 lofi uA Vop V 1 test limit pp V lt p Fig 6 Gain as a function of Vpp 292 ns G aB 284 ns 276 ns 268 ns 260 ns 252 ns 10 102 106 f kHz The dashed line delay ns the solid line gain dB Fig 7 Transfer for single speed September 1994 11 P TDA1302_1
15. R IDIODE MONITOR NU DIODE Vv N Rmt_d IMON BC548B lADJ XR 100 ka N 2ADJ 270 Q TDA1302T 9 R1 oun MONITOR ipiope N BC548B d T2 x Re 51 ka S RADJ BC548B lt Gy lo TDA1302T T1 MON BC548B IADJ R 51 kQ ADJ V lt 0 8V 6 BC548B Fig 11 NE532 or MC33171 51 kQ MON lo a TDA1302T ADJ Rang MKA709 Applications of the laser monitor units September 1994 14 P TDA1302_1 15 Wed Sep 14 13 30 56 1994 Philips Semiconductors Data amplifier and laser supply circuit for Preliminary specification TDA1302T CD player and read only optical systems PROPERTIES OF CIRCUIT FIG 11 a It is important that the Vg D1 approaches Vp_ T1 at approximately 150 uA that is why a small diode has been applied such as the BA482 Additional adjustment may be necessary this depends on the matching of Va D1 and Vbe T1 and the permitted tolerance on the laser current The advised adjustment procedure is as follows 1 Ensure that Rapy has the highest impedance at the beginning of the adjustment Adjust Rapi until the voltage across Rm has the value as indicated in Table 4 Table 4 Variable resistor Rm volta
16. cation section Laser control circuit The main function of the laser control circuit is to control the laser diode current in order to achieve a constant light output power which is based on the current of the monitor diode which is continuously monitored The circuit is built up into three parts The first part is the input stage which compares the monitor diode current with a current which is 10 times the value of the adjustable current The adjustable current is derived from a bandgap reference source to be temperature independent and can be further adjusted by the external resistor Rapy in order to adapt the circuit to the parameters of the laser monitor diode unit to be used The difference is fed to the second part The second part is the integrator stage which makes use of an external capacitor CL This capacitor has two different functions During switch on of the laser current it provides a current slope of typically dli o dt 10 6 CL A s After switch on it ensures that the bandwidth conforms to the typical formula fg K x Ae x 90 9 CL x Imon Hz where Aext represents the AC gain of an extra loop amplifier if applied and K dImonitor dliaser which is determined by the laser monitor unit Ivon is the average current pin 17 at typical light emission power of the laser diode Table 1 Operational modes The third part is the power output stage its input being the integrator output signal This stage has a
17. ge adjustment PICK UP UNIT MANUFACTURER Vrm mV SLD104U Sony corporation 150 LT022MS Sharp corporation 150 RLD 78MA Rohm corporation 150 SF90 Sanyo corporation 180 SF91 Sanyo corporation 180 Table 5 Further circuit properties of Fig 11 FIGURE PROPERTIES a single supply voltage only a few components are required 2R 1T and 1D supply voltage independent single supply voltage only a few components are required 1R 2T and 1D supply voltage independent no extra adjustment necessary if T1 and T2 match only a few components are required 1R and 2T supply voltage independent no extra adjustment necessary better power efficiency than b single supply voltage supply voltage independent no extra adjustment necessary no matching components required September 1994 15 In Figs 11 b to 11 d solutions have been given requiring no adjustment Rapy and R can be calculated as follows Rapu 12 4R Vam at Po nom Examples of advised values applicable to Fig 11 b c and d are given in Table 6 Table 6 Advised circuit values PICK UP MANUFACTURER Re Q Rans KQ UNIT SLD104U Sony corporation 620 51 LT022MS Sharp corporation 620 51 RLD 78MA Rohm corporation 620 51 SF90 Sanyo corporation 750 51 SF91 1 Sanyo corporation 750 51 Note 1 Notwithstanding
18. ot implied Exposure to limiting values for extended periods may affect device reliability Application information Where application information is given it is advisory and does not form part of the specification LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances devices or systems where malfunction of these products can reasonably be expected to result in personal injury Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale September 1994 19
19. speed mode IF NOT MODES SWITCH PIN CONNECTED GAIN SPEED LASER DEFAULT HIGH Low SINGLE DOUBLE ON OFF HG 1 1 0 X X X X Control pin LS 1 X X 1 0 x LDON 1 x x X X 1 0 Note 1 Where X don t care September 1994 TDA1302_1 7 Wed Sep 14 13 30 56 1994 Philips Semiconductors Preliminary specification Data amplifier and laser supply circuit for TDA1302T CD player and read only optical systems LIMITING VALUES In accordance with the Absolute Maximum Rating System IEC 134 SYMBOL PARAMETER MIN MAX UNIT Vpp supply voltage _ 8 0 V Piot total power dissipation _ 300 mW Tstg storage temperature 65 150 C Tamb operating ambient temperature 40 85 C HANDLING Classification A human body model C 100 pF R 1500 Q V 2000 V Charge device model C 200 pF L 2 5 uH R 0 Q V 250 V THERMAL RESISTANCE SYMBOL PARAMETER THERMAL RESISTANCE Rth j a from junction to ambient in free air 60 K W QUALITY SPECIFICATION In accordance with SNW FQ 611 part E The numbers of the quality specification can be found in the Quality Reference Handbook The handbook can be ordered using the code 9398 510 63011 CHARACTERISTICS Voo 3 4 V Vpp 2 5 V Tamb 25 C Rapi 48 kO HG logic 1 LS logic 1 with an external LP filter Rext 750 Q Cext 47 pF at pin 9 unless otherwise specified
20. that the SF91 specification details an astigmatic detection system TDA1301T requires a single Foucault parameter setting Figures 12 and 13 give the application diagrams of the pick up unit of the mechanisms as previously indicated TDA1302_1 16 Wed Sep 14 13 30 56 1994 Philips Semiconductors Preliminary specification Data amplifier and laser supply circuit for DA1302T CD player and read only optical systems 99 DIODES TDA1302T TDA1301T Vpp i be be Lk Eeit a Fig 12 Application of pick up units SLD104U LT022MS and RLD 78MA PHOTO DODES TDA1302T Voo K eee bigs 6 x 220 pF MKA711 Fig 13 Application of pick up unit SF91 September 1994 16 P TDA1302_1 17 Wed Sep 14 13 30 56 1994 Philips Semiconductors Preliminary specification Data amplifier and laser supply circuit for CD player and read only optical systems TDA1302T Circuit recommendations PRINTED CIRCUIT BOARD LAY OUT ITEMS It is advised to keep the output wires of the diode current amplifiers separated from the input as much as possible to prevent oscillations EXTERNAL MONITOR DIODE CIRCUITRY TDA1302T protects the laser diode against damage due to supply voltage transients When any external circuitry is used in the
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PHILIPS TDA1302T Data ampli er laser supply circuit for CD player read only optical systems handbook