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TZA1015T Datasheet(PDF) 2 Page - NXP Semiconductors |
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TZA1015T Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 20 page 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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