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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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DP8464B Fiches technique(PDF) 6 Page - National Semiconductor (TI) |
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DP8464B Fiches technique(HTML) 6 Page - National Semiconductor (TI) |
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6 / 26 page  Pin Definitions (All pin numbers refer to the 24 pin dual-in-line package) Pin Name Function Power Supply 9VCC The supply is a12Vg10% 17 Digital Digital signals should be referenced Ground to this pin 20 Analog Analog signals should be referenced Ground to this pin Analog Signals 6 Amp Ina These are the differential inputs to 7 Amp Inb the Amplifier The output of the read write head amplifier should be capac- itively coupled to these pins 18 Amp Outa These are the differential outputs of 19 Amp Outb the Amplifier These outputs should be capacitively coupled to the gating channel filter (if required) and to the time channel filter 22 Gate These are the differential inputs to 21 Channel the AGC block and the gating chan- Inputs nel These inputs must be capacitive- ly coupled from the Amp Out 2 Time These are the differential inputs to Channel the differentiator in the time channel Inputa In most applications a filter between 23 Time the Amp Out (pins 18 and 19) and Channel these inputs is required to band limit Inputb the noise and to correct for any phase distortion introduced by the read circuitry In all cases this input must be capacitively coupled to pre- vent disturbing the DC input level 1Cda The external differentiator network is 24 Cdb connected between these two pins 3 Set The DC voltage on this pin sets the Hysteresis amount of hysteresis on the differen- tial comparator Typically this voltage can be established by a simple resis- tive divider from the positive supply 4VREF The AGC circuit adjusts the gain of the amplifier to make the differential peak to peak voltage on the Gate Channel Input equal to four times the DC voltage on this pin This voltage can be established by a simple resis- tive divider from the positive supply 5 No connection 8 No connection 16 CAGC The external capacitor for the AGC is connected between this pin and Ana- log Ground Pin Name Function Digital Signals 10 Set Pulse An external capacitor to control the Width pulse width of the Encoded Data Out is connected between this pin and Digital Ground 11 Read Write If this pin is low the Pulse Detector is in the read mode and the chip is ac- tive When this pin goes high the pulse detector is forced into a stand- by mode This is a standard TTL in- put 12 Time This is the TTL output from the bi-di- Pulse rectional one shot following the dif- Out ferentiator In most applications this can be connected directly to the Time Pulse In 13 Time This is the TTL input to the clock of Pulse the D flip-flop Usually this is con- In nected directly to the Time Pulse Out pin 15 Channel This is the buffered output of the dif- Alignment ferential comparator with hysteresis This is usually used in the initial sys- tem design and is not used in produc- tion 14 Encoded This is the standard TTL output Data Out whose leading edge indicates the time position of the peaks Application Information GENERAL DESCRIPTION All pin numbers refer to 24 pin dual-in-line package The DP8464B Disk Pulse Detector utilizes analog and digital circuitry to detect amplitude peaks of the signal received from the ReadWrite Amplifier The analog signal from a disk is a series of pulses the peaks of which correspond to 1’s or flux reversals on the magnetic medium The pulse detector must accurately determine the time position of these peaks The peaks are indicated by the positive lead- ing edge of a TTL compatible output pulse This task is com- plicated by variable pulse amplitudes depending on the me- dia type head position head type and readwrite amplifier circuit gain Additionally as the bit density on the disk in- creases the amplitude decreases and significant bit interac- tion occurs resulting in pulse distortion and shifting of the peaks The graph in Figure 1 shows how the pulse amplitude varies with the number of flux reversals per inch (or recording den- sity) for a given head disk system The predominant disk applications are associated with the first two regions on this graph Regions 1 and 2 Typical waveforms received by the pulse detector for these regions are shown next to the graph 6 |
Numéro de pièce similaire - DP8464B |
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Description similaire - DP8464B |
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