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TZA1024 Datasheet(PDF) 2 Page - NXP Semiconductors

Part No. TZA1024
Description  Data amplifier and laser supply circuit for CD audio and video optical systems ADALAS
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com

TZA1024 Datasheet(HTML) 2 Page - NXP Semiconductors

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1998 Oct 30
Philips Semiconductors
Product specification
Data amplifier and laser supply circuit for CD
audio and video optical systems (ADALAS)
• Supports a wide range of voltage output mechanisms
• RF amplifier designed for audio and video applications
with data rates up to a maximum of n = 4 times speed
• Programmable RF gain for CD-Audio/Video (CD-A/V)
and CD-Read/Write (CD-R/W) discs
• Adjustable equalizer for n = 1 or n = 2 times speed
• Fully Automatic Laser Power Control (ALPC) including
stabilization plus a separate laser supply voltage for
power efficiency
• Adjustable current range of ALPC output
• Automatic N- or P-substrate monitor diode selection
• Adjustable laser bandwidth and laser switch-on current
slope using external capacitor
• Protection circuit to prevent laser damage due to laser
supply voltage dip
• Optimized interconnection between data amplifier and
Philips’ digital signal processor CD10 (SAA7324)
• Wide supply voltage range
• Power-down switch to reduce power consumption
during standby
• Low power consumption.
The TZA1024 is a data amplifier and laser supply circuit for
voltage output mechanisms found in a wide range of audio
and video CD systems. The device contains an RF
amplifier and an automatic laser power control circuit.
The preamplifier forms a versatile, programmable
interface for voltage output CD mechanisms to the Philips’
digital signal processor CD10 (SAA7324).
The RF bandwidth allows this device to be used in CD-A/V
and CD-R/W applications with a data rate up to a
maximum of n = 4 times speed. The RF gain can be
adapted for CD-A/V discs or CD-R/W discs by means of
the gain select signal.
The equalizer can be adjusted for n = 1 or n = 2 times
speed with the equalizer/speed select signal. For n = 4
times speed the RF is not equalized.
The TZA1024 can be adapted to a wide range of voltage
output mechanisms by means of external resistors.
The 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. The ALPC can accommodate
N- or P-substrate monitor diodes.
A separate supply voltage connection for the laser allows
the internal power dissipation to be reduced by connecting
a low voltage supply. The laser output current range can
be optimized to fit the requirements of the laser diode by
means of one external resistor. When a DC-to-DC
converter is used, in combination with the control loop of
the ALPC, the adjustable output current range provides
the possibility to compensate for the extra gain a DC-to-DC
converter introduces in the control loop.

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