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.

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.