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TDA1302T データシート(PDF) 1 Page - NXP Semiconductors |
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1 / 18 page TDA1302_1 2 Wed Sep 14 13:30:56 1994 September 1994 2 Philips Semiconductors Preliminary specification Data amplifier and laser supply circuit for CD player and read only optical systems TDA1302T 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. GENERAL DESCRIPTION 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 and double foucault detectors and can be applied to all N-sub laser/monitor diode units even though the circuit has been optimized for the Philips CDM12 mechanisms and the digital servo controller TDA1301T. After a single initial adjustment the circuit will maintain control over the laser diode current thus resulting in a constant light output power which is independent of ageing. The IC is mounted in a small-outline package to enable it to be mounted close to the laser pick-up unit on the sledge. QUICK REFERENCE DATA ORDERING INFORMATION SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT VDD supply voltage (pin 18) 3.4 − 5.5 V Diode current amplifiers Gdn amplification − 1.55 − dB Ios(d) diode output offset current − − 100 nA B 3 dB bandwidth Ii(d) = 1.67 µA 50 − − kHz RFE amplifier (built-in equalizer) td(eq) equalization delay fi = 0.3 MHz − 320 − ns td(f) flatness delay double-speed − 5 − ns Laser supply Io(l) output current VDDL = 3 V − − −100 mA TYPE NUMBER PACKAGE NAME DESCRIPTION VERSION TDA1302T SO24 plastic small outline package; 24 leads; body width 7.5 mm SOT137-1 |
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