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TDA1302T Datasheet(PDF) 1 Page - NXP Semiconductors

Part No. TDA1302T
Description  Data amplifier and laser supply circuit for CD player and read only optical systems
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA1302T Datasheet(HTML) 1 Page - NXP Semiconductors

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TDA1302_1
2 Wed Sep 14 13:30:56 1994
September 1994
2
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
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
ORDERING INFORMATION
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
VDD
supply voltage (pin 18)
3.4
5.5
V
Diode current amplifiers
Gdn
amplification
1.55
dB
Ios(d)
diode output offset current
100
nA
B
3 dB bandwidth
Ii(d) = 1.67 µA
50
kHz
RFE amplifier (built-in equalizer)
td(eq)
equalization delay
fi = 0.3 MHz
320
ns
td(f)
flatness delay
double-speed
5
ns
Laser supply
Io(l)
output current
VDDL = 3 V
−100
mA
TYPE NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA1302T
SO24
plastic small outline package; 24 leads; body width 7.5 mm
SOT137-1


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