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Symbol No. No. Function
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DS90CF563MTD ,LVDS 18-Bit Color Flat Panel Display (FPD) LinkBlock DiagramsDS90CF563DS90CF564DS012615-2DS012615-1Order Number DS90CF563MTDOrder Number DS90CF564 ..
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DP8464BV-23
Disk Pulse Detector [Life-time buy]
TL/F/5283
DP8464B
Disk
Pulse
Detector
June 1989
DP8464B Disk Pulse Detector
General Description
The DP8464BDisk Pulse Detector utilizes analogand digital
circuitryto detect amplitude peaksofthe signal received
fromthe read/write amplifier fitted withthe headsof disk
drives. The DP8464B producesa TTL compatible output
which,on thepositive leading edge, indicatesa signal peak.
Electrically,these peaks correspondtoflux reversalsonthe
magnetic medium.The signal fromthe read/write amplifier
when readinga diskis thereforea seriesof pulses with
alternating polarity.The Disk Pulse Detector accuratelyrep-
licatesthe time positionof these peaks.
The DP8464B Disk Pulse Detectorhas three main sections:
the Amplifier,the time channelandthe gate channel.The
Amplifier section consistsofa wide bandwidth amplifier,a
full wave rectifier and Automatic Gain Control (AGC). The
time channelis made fromthe differentiatorandits follow-
ing bi-directionalone shot, whilethe gate channelis made
fromthe differential comparator with hysteresis,theDflip-
flopandits following bi-directionalone shot.
The Disk Pulse Detectoris fabricated usingan advanced
oxide isolated Schottky process,andhas been designedto
function with data ratesupto15 Megabits/second. The
DP8464Bis availablein eithera300mil wide 24-pin dual-in-
line packageora surface mount 28-pin plastic chip carrier
package. Normally,itwillbe fittedinthedisk drive,andits
output maybe directly connectedtothe DP8461orthe
DP8465 Data Separator.
Features Wide input signal amplitude rangeÐfrom20 mVppto
660 mVpp differential Data ratesupto15 Megabits/sec2,7 code On-chip differential gain controlled amplifier, differentia-
tor, comparator gating circuitry, and output pulse
generator Input capacitively coupled directly fromthe disk head
read/write amplifier Adjustable comparator hysteresis AGC and differentiator time constantssetby external
components TTL compatible digital Inputsand Outputs Encoded Data Output may connect directlyto the
DP8461or DP8465 Data Separator Standard drive supply: 12Vg10% Availablein 300mil wide 24-pin dual-in-line package,a
surface mount 28-pin plastic chip carrier package,ora
40-pin TapePakÉ package
Block Diagram
Pin5ÐNo connection
Pin8ÐNo connection
TL/F/5283–7
Note:Allpin numbersinthisdata sheetrefertothe 24-pin dual-in-line package.
TapePakÉisaregistered trademarkof National SemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
