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| 型號： | TLS24306 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Magnetoresistive/Thin-Film Read/Write Preamplifiers(6通道磁阻/薄膜讀/寫用前置放大器) |
| 中文描述： | 磁阻/薄膜讀/寫前置放大器（6通道磁阻/薄膜讀/寫用前置放大器） |
| 文件頁數(shù)： | 18/23頁 |
| 文件大?。?/td> | 489K |
| 代理商： | TLS24306 |
TLS24302, TLS24306
2- AND 6-CHANNEL MAGNETORESISTIVE/THIN-FILM
READ/WRITE PREAMPLIFIERS
SQHS007A – DECEMBER 8, 1995 – REVISED DECEMBER 15, 1995
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
fault mode
TI recommends that a 2.4-k pullup resistor to V
CC
be connected to FLT/SE, which is an open-collector output.
During write mode, FLT is valid after one low-to-high transition of WDX/WDY following the required read-write
transition time. RDX and RDY are in a high-impedance state during all fault-mode occurrences except when
an MR-head short occurs. For all fault modes except WDX/WDY frequency low, one transition of WDX/WDY
is required to clear FLT after removing the fault condition. The WDX/WDY frequency low-fault detector is cleared
when two consecutive positive transitions of WDX/WDY meet the minimum frequency for the flip-flop disabled
device or the detection of three consecutive positive transitions that meet the minimum frequency for the flip-flop
enabled device. Table 6 summarizes the fault conditions.
Table 6. Fault Conditions
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Hi h
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W i
Hi h
Write
High
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Low
RDX and RDY are in the high-impedance state for all fault-mode occurrences.
Thermal-asperity detect
Low VCC
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No write current
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The write-current and read-bias-current sources remain activated during any fault mode, but the driver circuit
controlling I
I(W)
and
II(BIAS)
has a shunt circuit that reduces I
I(W)
and
II(BIAS)
to zero.
For a complete listing of optional functions see Table 1.
MR-head short detection
The voltage comparator is presented at the input stage to protect MR from head short. The preamplifier stays
in the active mode and only FLT reports this fault.
MR head open protection
The voltage comparator is presented at the input stage to protect MR from head open. The preamplifier goes
to a pseudo-idle mode until the fault is cleared, after which either taking CS high or selecting another functional
head resets the preamplifier.
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