DP8464B

DP8464B Disk Pulse Detector 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 read write 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 read write amplifier when reading a disk is therefore a series of pulses with alternating polarity The Disk Pulse Detector accurately replicates 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 following bi-directional one shot while the gate channel is made from the differential comparator with hysteresis the D flipflop 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 Megabits second The DP8464B is available in either a 300 mil wide 24-pin dual-inline 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 ...