TDA1302T

TDA1302_1 2 Wed Sep 14 13:30:56 1994 Philips Semiconductors Preliminary specification Data amplifier and laser supply circuit for CD player and read only optical systems FEATURES Six input buffer amplifiers with low-pass filtering and with virtually no offset HF data amplifier with a high or low gain mode Two built-in equalizers for single or double-speed mode ensuring high performance in both modes Fully automatic laser control including stabilization and an ON/OFF switch, plus a separate supply (VDDL) for power reduction Adjustable laser bandwidth and laser switch-on current slope Protection circuit to prevent laser damage due to supply voltage dip Optimized interconnectiion between pick-up detector and digital servo processor (TDA1301T) Wide supply voltage range Wide temperature range Low power consumption. QUICK REFERENCE DATA SYMBOL VDD Gdn Ios(d) B PARAMETER supply voltage (pin 18) CONDITIONS MIN. 3.4 − − Ii(d) = 1.67 µA fi = 0.3 MHz double-speed 50 − − − − TYP. GENERAL DESCRIPTION TDA1302T The TDA1302T is a data amplifier and laser supply circuit for three-beam pick-up detectors applied in a wide range of mechanisms for Compact Disc and read only optical systems. The device contains 6 amplifiers which amplify and filter the focus and radial diode signals and provides an equalized RF signal suitable for single or double speed mode; the mode can be switched by means of the speed control pin. The device can accommodate astigmatic, single foucault a...