TZA1015T PHILIPS [NXP Semiconductors], TZA1015T Datasheet - Page 2

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TZA1015T

Manufacturer Part Number
TZA1015T
Description
Data amplifier and laser supply circuit for CD and read-only optical systems HDALAS
Manufacturer
PHILIPS [NXP Semiconductors]
Datasheets

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Philips Semiconductors
FEATURES
ORDERING INFORMATION
1999 Aug 19
TYPE NUMBER
TZA1015T
Six input buffer amplifiers with low-pass filtering and
virtually no offset
Universal photodiode IC interface using internal
conversion resistors
RF data amplifier with wide bandwidth designed for data
rates up to a maximum of 30
Programmable RF gain for CD-A/V, CD-R, CD-R/W and
CD-ROM applications
Programmable RF bandwidth for optimal playability
Radial error signal for fast track counting
Programmable RF/Fast Track Count (FTC) gain for
optimal dynamic range
Fully automatic laser control including stabilization and
on/off switch plus a separate supply for power efficiency
Automatic monitor diode polarity selection
Adjustable laser bandwidth and laser switch-on current
slope using external capacitor
Protection circuit to prevent laser damage due to supply
voltage dip
Optimized interconnection between data amplifier and
Philips’ digital signal processor family (CD7, ACE and
MACE)
Wide supply voltage range
Wide temperature range
Low power consumption.
Data amplifier and laser supply circuit for CD
and read-only optical systems (HDALAS)
NAME
SO28
plastic small outline package; 28 leads; body width 7.5 mm
2
DESCRIPTION
GENERAL DESCRIPTION
The TZA1015 is a data amplifier and laser supply circuit for
3-beam pick-up detectors found in a wide range of CD and
read-only optical systems.
The device contains 6 transimpedance amplifiers to
amplify and filter the focus and radial photo diode voltage
input signals. The preamplifier forms a versatile,
programmable interface from voltage output CD
mechanisms to the Philips’ digital signal processor family.
The dynamic range of this preamplifier/processor
combination can be optimized for the LF servo and RF
data paths. The servo channel gain is set by the ADC
range of the processor. The RF data channel can be
programmed in the TZA1015 preamplifier.
The programmable RF bandwidth allows this device to be
used in CD-A/V applications or CD-R, CD-R/W and
CD-ROM applications with a data rate up to a maximum of
30 . The RF and LF gain can be adapted for CD-A/V,
CD-R and CD-ROM discs or CD-R/W discs by means of a
gain switch. In addition to this gain switch the RF gain is
programmable to guarantee optimal playability. In order to
enable minimal access time the TZA1015 generates a
Fast Track Count signal which enables the decoder
(ACE or MACE) to count the number of tracks during a
track jump.
The device can accommodate astigmatic, single Foucault
and double Foucault detectors and can be used with all
laser and N- or P-sub monitor diodes. The Automatic Laser
Power Control (ALPC) circuit will maintain control over the
laser diode current. With an on-chip reference voltage
generator, a constant and stabilized output power is
ensured independent of ageing. A separate power supply
connection allows the internal power dissipation to be
reduced by connecting a low voltage supply.
PACKAGE
Product specification
TZA1015
SOT136-1
VERSION

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