BH6626FS Просмотр технического описания (PDF) - ROHM Semiconductor

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BH6626FS

Read / Write amplifier for FDD

ROHM Semiconductor 

Magnetic disk ICs

FMeasurement circuit

BH6626FS

FCircuit operation

(1) Read

The input signal from the head coils from each side of the

disc is amplified by the preamplifier and then differen-

tiated. The filter time constant can be set externally. After

differentiation, the differential output is input to the

comparator. The time domain filter detects zero cross,

and the output is converted to read data. The monostable

multivibrator width can be set externally, while the read

data pulse width is a constant 400ns.

(2) Write

Input write data are converted to toggle movements by

the internal flip-flops, operating the write driver. The write

driver current is supplied by the write current generator,

but the externally set current can be controlled according

to density and by selecting inner track/ outer track.

(3) Erase

An open collector output pin is used, and the erase cur-

rent is set with a resistor between it and the head.

(4) Power supply

When the low level voltage detector detects a drop in the

supply voltage, writing and erasing are prohibited.

532

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