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NXP Semiconductors - Data amplifier and laser supply circuit for CD player and read only optical systems

Numéro de référence TDA1302T
Description Data amplifier and laser supply circuit for CD player and read only optical systems
Fabricant NXP Semiconductors 
Logo NXP Semiconductors 





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TDA1302T fiche technique
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
Preliminary specification
TDA1302T
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 (VDDL) for
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.
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
control pin. The device can accommodate astigmatic,
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.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
VDD supply voltage (pin 18)
Diode current amplifiers
Gdn
Ios(d)
B
amplification
diode output offset current
3 dB bandwidth
RFE amplifier (built-in equalizer)
td(eq)
td(f)
equalization delay
flatness delay
Laser supply
Io(l) output current
CONDITIONS
MIN. TYP. MAX. UNIT
3.4
5.5 V
Ii(d) = 1.67 µA
1.55 dB
− − 100 nA
50 − − kHz
fi = 0.3 MHz
double-speed
320 ns
5 ns
VDDL = 3 V
− − −100 mA
ORDERING INFORMATION
TYPE NUMBER
TDA1302T
NAME
SO24
PACKAGE
DESCRIPTION
plastic small outline package; 24 leads; body width 7.5 mm
VERSION
SOT137-1
September 1994
2

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