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DP8464BV-1 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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DP8464BV-1 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 26 page  TLF5283 June 1989 DP8464B Disk Pulse Detector General Description The DP8464B Disk Pulse Detector utilizes analog and digital circuitry to detect amplitude peaks of the signal received from the readwrite amplifier fitted with the heads of disk drives The DP8464B produces a TTL compatible output which on the positive leading edge indicates a signal peak Electrically these peaks correspond to flux reversals on the magnetic medium The signal from the readwrite amplifier when reading a disk is therefore a series of pulses with alternating polarity The Disk Pulse Detector accurately rep- licates the time position of these peaks The DP8464B Disk Pulse Detector has three main sections the Amplifier the time channel and the gate channel The Amplifier section consists of a wide bandwidth amplifier a full wave rectifier and Automatic Gain Control (AGC) The time channel is made from the differentiator and its follow- ing bi-directional one shot while the gate channel is made from the differential comparator with hysteresis the D flip- flop and its following bi-directional one shot The Disk Pulse Detector is fabricated using an advanced oxide isolated Schottky process and has been designed to function with data rates up to 15 Megabitssecond The DP8464B is available in either a 300 mil wide 24-pin dual-in- line package or a surface mount 28-pin plastic chip carrier package Normally it will be fitted in the disk drive and its output may be directly connected to the DP8461 or the DP8465 Data Separator Features Y Wide input signal amplitude rangefrom 20 mVpp to 660 mVpp differential Y Data rates up to 15 Megabitssec 27 code Y On-chip differential gain controlled amplifier differentia- tor comparator gating circuitry and output pulse generator Y Input capacitively coupled directly from the disk head readwrite amplifier Y Adjustable comparator hysteresis Y AGC and differentiator time constants set by external components Y TTL compatible digital Inputs and Outputs Y Encoded Data Output may connect directly to the DP8461 or DP8465 Data Separator Y Standard drive supply 12Vg10% Y Available in 300 mil wide 24-pin dual-in-line package a surface mount 28-pin plastic chip carrier package or a 40-pin TapePak package Block Diagram Pin 5No connection Pin 8No connection TLF5283 – 7 Note All pin numbers in this data sheet refer to the 24-pin dual-in-line package TapePak is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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