TZA1026

General description

The TZA1026 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 versatileprogrammable interface for voltage output CD mechanisms to the Philips? digital signal processor CD10Auto (SAA7326).

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 TZA1026 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 generatora 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 usedin 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.

Features

• Suitable for automotive applications
• 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 CD10Auto (SAA7326)
• Wide supply voltage range
• Power-down switch to reduce power consumption during standby
• Wide temperature range
• Low power consumption.

Applications

Related applications
DVD+R/RW engine

Print / Email

• Print this information
• Email this information

Disclaimer

The information published on product information pages of the www.nxp.com or www.semiconductors.com websites is an extract from product data sheets and is for information purposes only. For detailed information please check the most recent version of the relevant product data sheet as published on these websites. In the event of any conflict between product information pages and data sheets or deviations from information provided in the product data sheets on these product information pages, the information provided in the product data sheets shall prevail.

The product status of the product(s) described in the product data sheet may have changed since publication of the data sheet and therefore information in datasheets on product status may be outdated. The latest information on product status is published on the product information pages of the above-mentioned websites.

As from October 1st, 2006 Philips Semiconductors has a new trade name - NXP Semiconductors, which will be used in future data sheets together with new contact details. In data sheets where the previous Philips references remain, please use the new links as shown below.

http://www.philips.semiconductors.com use http://www.nxp.com

http://www.semiconductors.philips.com use http://www.nxp.com (Internet)

sales.addresses@www.semiconductors.philips.com use salesaddresses@nxp.com (e-mail)

The copyright notice at the bottom of each page (or elsewhere in the document, depending on the version)
- © Koninklijke Philips Electronics N.V. (year). All rights reserved -
is replaced with:
- © NXP B.V. (year). All rights reserved.-

If you have any questions related to the data sheet, please contact our nearest sales office via e-mail or phone (details via salesaddresses@nxp.com). Thank you for your cooperation and understanding.