參數(shù)資料
型號: TZA1015
廠商: NXP Semiconductors N.V.
英文描述: Data amplifier and laser supply circuit for CD and read-only optical systems (HDALAS)(應(yīng)用在CD和只讀光電系統(tǒng)(HDALAS)中的數(shù)據(jù)放大器和激光電源電路)
中文描述: 數(shù)據(jù)放大器和激光電源電路的CD和只讀(HDALAS)光學(xué)系統(tǒng)(應(yīng)用在光盤和只讀光電系統(tǒng)(HDALAS)中的數(shù)據(jù)放大器和激光電源電路)
文件頁數(shù): 2/20頁
文件大?。?/td> 100K
代理商: TZA1015
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
TheTZA1015isadataamplifierandlasersupplycircuitfor
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
laserandN-orP-submonitordiodes.TheAutomaticLaser
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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