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參數(shù)資料
| 型號(hào)： | BH6629BFS |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | Read /Write amplifier for FDD |
| 中文描述： | 讀/寫放大器軟驅(qū) |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 268K |
| 代理商： | BH6629BFS |
574
Magnetic disk ICs
BH6629BFS
Measurement circuit
Circuit 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.
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