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Part Number: DP8464B
Description: The DP8464B Disk Pulse Detector utilizes analog and digital circuitry to detect amplitude peaks of the...
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DP8464B
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General Description
DP8464B 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
DP8464B Maximum Ratings
Supply Voltage ...............................................9 14V
TTL Input Voltage ...................................11,13 5.5V
TTL Output Voltage ............................12,14,15 5.5V
Input Voltage .............................................3,4 5.5V
Minimum Input Voltage............................. 3,4 b0.5V
Differential Input ....................6-7, 21-22, 3V or b3V
Voltage .............................................................2-23
ESD Susceptibility .....(see Note 5)
Storage Temperature ...................b65ßC to a150..C
Lead Temp. (Soldering, 10 seconds) ..............300..C
Maximum Power Dissipation at........................ 25 ..C
Molded DIP Package
(derate 15.6 mW/ßC above 25..C) .............1950 mW
Plastic Chip Carrier Package
(derate 12.5 mW/ßC above 25..C) .............1560 mW
TTL Input Voltage ...................................11,13 5.5V
TTL Output Voltage ............................12,14,15 5.5V
Input Voltage .............................................3,4 5.5V
Minimum Input Voltage............................. 3,4 b0.5V
Differential Input ....................6-7, 21-22, 3V or b3V
Voltage .............................................................2-23
ESD Susceptibility .....(see Note 5)
Storage Temperature ...................b65ßC to a150..C
Lead Temp. (Soldering, 10 seconds) ..............300..C
Maximum Power Dissipation at........................ 25 ..C
Molded DIP Package
(derate 15.6 mW/ßC above 25..C) .............1950 mW
Plastic Chip Carrier Package
(derate 12.5 mW/ßC above 25..C) .............1560 mW
DP8464B Features
Wide input signal amplitude rangefrom 20 mVpp to 660 mVpp differential
Data rates up to 15 Megabits/sec 2,7 code
On-chip differential gain controlled amplifier, differentiator, comparator gating circuitry, and output pulse generator
Input capacitively coupled directly from the disk head read/write amplifier
Adjustable comparator hysteresis
AGC and differentiator time constants set by external components
TTL compatible digital Inputs and Outputs
Encoded Data Output may connect directly to the DP8461 or DP8465 Data Separator
Standard drive supply: 12Vg10%
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
Data rates up to 15 Megabits/sec 2,7 code
On-chip differential gain controlled amplifier, differentiator, comparator gating circuitry, and output pulse generator
Input capacitively coupled directly from the disk head read/write amplifier
Adjustable comparator hysteresis
AGC and differentiator time constants set by external components
TTL compatible digital Inputs and Outputs
Encoded Data Output may connect directly to the DP8461 or DP8465 Data Separator
Standard drive supply: 12Vg10%
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
DP8464B
PDF/DataSheet Download
- Datasheet: DP8464B
- File Size: 393147 KB
- Manufacturer: NSC [National Semiconductor]
- Click here to Download
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