TDA1302T

Manufacturer Part NumberTDA1302T
DescriptionData amplifier and laser supply circuit for CD player and read only optical systems
ManufacturerPhilips Semiconductors
TDA1302T datasheet
 
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TDA1302_1 2 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Data amplifier and laser supply circuit for
CD player and read only optical systems
FEATURES
Six input buffer amplifiers with low-pass filtering and with
virtually no offset
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
Fully automatic laser control including stabilization and
an ON/OFF switch, plus a separate supply (V
power reduction
Adjustable laser bandwidth and laser switch-on current
slope
Protection circuit to prevent laser damage due to supply
voltage dip
Optimized interconnectiion between pick-up detector
and digital servo processor (TDA1301T)
Wide supply voltage range
Wide temperature range
Low power consumption.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
V
supply voltage (pin 18)
DD
Diode current amplifiers
G
amplification
dn
I
diode output offset current
os(d)
B
3 dB bandwidth
RFE amplifier (built-in equalizer)
t
equalization delay
d(eq)
t
flatness delay
d(f)
Laser supply
I
output current
o(l)
ORDERING INFORMATION
TYPE NUMBER
NAME
TDA1302T
SO24
September 1994
GENERAL DESCRIPTION
The TDA1302T is a data amplifier and laser supply circuit
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
mode; the mode can be switched by means of the speed
) for
control pin. The device can accommodate astigmatic,
DDL
single foucault and double foucault detectors and can be
applied to all N-sub laser/monitor diode units even though
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
control over the laser diode current thus resulting in a
constant light output power which is independent of
ageing. The IC is mounted in a small-outline package to
enable it to be mounted close to the laser pick-up unit on
the sledge.
CONDITIONS
3.4
I
= 1.67 A
50
i(d)
f
= 0.3 MHz
i
double-speed
V
= 3 V
DDL
PACKAGE
DESCRIPTION
plastic small outline package; 24 leads; body width 7.5 mm
2
Preliminary specification
TDA1302T
MIN.
TYP.
MAX.
UNIT
5.5
V
1.55
dB
100
nA
kHz
320
ns
5
ns
100
mA
VERSION
SOT137-1

TDA1302T Summary of contents

  • Page 1

    ... TDA1302T SO24 September 1994 GENERAL DESCRIPTION The TDA1302T is a data amplifier and laser supply circuit 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 mode ...

  • Page 2

    ... Philips Semiconductors Data amplifier and laser supply circuit for CD player and read only optical systems SCHEMATIC DIAGRAM September 1994 Preliminary specification TDA1302T 3 ...

  • Page 3

    ... TDA1302_1 4 Wed Sep 14 13:30:56 1994 Philips Semiconductors Data amplifier and laser supply circuit for CD player and read only optical systems BLOCK DIAGRAM September 1994 Fig.2 Block diagram. 4 Preliminary specification TDA1302T ...

  • Page 4

    ... photo detector input 2 (central photo detector input 5 (satellite photo detector input 1 (central photo detector input 3 (central photo detector input 6 (satellite photo detector input 4 (central) September 1994 Preliminary specification TDA1302T Fig.3 Pin configuration. 5 ...

  • Page 5

    ... Philips Semiconductors Data amplifier and laser supply circuit for 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 amplification section. Laser control circuit ...

  • Page 6

    ... I = 1.67 A i(d) 0 1.67 A; 1.43 i( note 2 o(dn note 3 csin tsin 500 di o( o(dn) o(dm) 7 Preliminary specification TDA1302T MAX. UNIT 8.0 V 300 mW +150 C +85 C THERMAL RESISTANCE 60 K/W TYP. MAX. UNIT 8 mA 5 pA 1.55 1.67 ...

  • Page 7

    ... A 3 i(d) 0 100 mA 0.2 o( i(mon) ADJ 1.15 ADJ ADJ R = 5.6 k ADJ ADJ ADJ 8 Preliminary specification TDA1302T TYP. MAX. UNIT 0.3 V 120 143 k 240 285 100 320 ns 10 MHz +0 0 100 A V ...

  • Page 8

    ... ext ext ----------------------------------------- - ext ext od DESCRIPTION internally defined internally defined internally defined internally defined see Chapter “Characteristics” external resistor external capacitor 9 Preliminary specification TDA1302T (1) (2) TYP. UNIT 4 1.094 0.691 6 17.6 10 rad/s 750 47 pF ...

  • Page 9

    ... CD player and read only optical systems = test limit. Fig.4 Maximum input current as a function test limit. Fig.5 Output current as a function of input current. September 1994 Preliminary specification TDA1302T ...

  • Page 10

    ... Philips Semiconductors Data amplifier and laser supply circuit for CD player and read only optical systems I = test limit. The dashed line = delay (ns); the solid line = gain (dB). September 1994 Fig.6 Gain as a function Fig.7 Transfer for single speed. 11 Preliminary specification TDA1302T ...

  • Page 11

    ... TDA1302_1 12 Wed Sep 14 13:30:56 1994 Philips Semiconductors Data amplifier and laser supply circuit for CD player and read only optical systems INTERNAL PIN CONFIGURATION September 1994 Fig.8 Equivalent internal pin diagrams. 12 Preliminary specification TDA1302T ...

  • Page 12

    ... Application with Philips CDM12 The CDM12 mechanism uses an N sub-laser diode together with a P sub-monitor diode and, since TDA1302T Fig.9 Application of the CDM12 laser/monitor diode unit. September 1994 is optimized for this type, besides the standard components CL and R are required as illustrated in Fig ...

  • Page 13

    ... Philips Semiconductors 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 ...

  • Page 14

    ... Notwithstanding that the SF91 specification details an 150 astigmatic detection system, TDA1301T requires a 180 single Foucault parameter setting. 180 Figures 12 and 13 give the application diagrams of the pick-up unit of the mechanisms as previously indicated. 15 Preliminary specification TDA1302T can be calculated as follows ADJ 620 51 ...

  • Page 15

    ... TDA1302_1 16 Wed Sep 14 13:30:56 1994 Philips Semiconductors Data amplifier and laser supply circuit for CD player and read only optical systems Fig.12 Application of pick-up units SLD104U, LT022MS and RLD-78MA. September 1994 Fig.13 Application of pick-up unit SF91. 16 Preliminary specification TDA1302T ...

  • Page 16

    ... E XTERNAL MONITOR DIODE CIRCUITRY TDA1302T protects the laser diode against damage due to supply voltage transients. When any external circuitry is used in the ‘laser diode-monitor diode’ chain, the safety of the laser diode completely relies on the quality of this external circuitry ...

  • Page 17

    ... Data amplifier and laser supply circuit for CD player and read only optical systems PACKAGE OUTLINE handbook, full pagewidth S 0.9 (4x) 0.4 24 pin 1 index 1 Dimensions in mm. Fig.14 Plastic small outline package; 24 leads; body width 7.5 mm (SO24L; SOT137AH). September 1994 15.6 15.2 0 2.45 0.3 2.25 0.1 12 0.49 0.25 M 0.36 1.27 (24x) 18 Preliminary specification TDA1302T 7.6 7.4 A 10.65 10.00 1.1 1.0 2.65 0.32 2.35 0.23 1 detail A MBC235 - 1 ...

  • Page 18

    ... Philips for any damages resulting from such improper use or sale. September 1994 Preliminary specification TDA1302T 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 ...