TZA1015T datasheet(2/20 Pages) PHILIPS

Part #	TZA1015T

Description	Data amplifier and laser supply circuit for CD and read-only optical systems HDALAS

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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1999 Aug 19

2

Philips Semiconductors

Product speciﬁcation

Data ampliﬁer and laser supply circuit for CD

and read-only optical systems (HDALAS)

TZA1015

FEATURES

• 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.

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.

ORDERING INFORMATION

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

TZA1015T

SO28

plastic small outline package; 28 leads; body width 7.5 mm

SOT136-1

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