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| 型號： | TLS24302 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Magnetoresistive/Thin-Film Read/Write Preamplifiers(2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（2通道磁阻/薄膜讀/寫用前置放大器） |
| 文件頁數(shù)： | 13/23頁 |
| 文件大小： | 489K |
| 代理商： | TLS24302 |
TLS24302, TLS24306
2- AND 6-CHANNEL MAGNETORESISTIVE/THIN-FILM
READ/WRITE PREAMPLIFIERS
SQHS007A – DECEMBER 8, 1995 – REVISED DECEMBER 15, 1995
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
fault switching
Fault-switching characteristics are provided using the following assumptions:
If the nongrounded side of the MR sensor becomes grounded, the head voltage diminishes due to a
decrease in the head resistance. This condition should be reported and prevented.
If the MR-sensor voltage rises to the thermal-asperity threshold, the voltage across the MR stripe rises
rapidly. This condition should be reported as a fault.
For a complete listing of optional functions see Table 1.
fault-electrical characteristics,
L
I(TF)
= 180 nH, R
I(TF)
= 15
, f
I(W)
= 1 MHz to 65 MHz,
I
I(BIAS)
= 7 mA to 17 mA, R
(MR)
= 10
to 40
,
C
L
= 12 pF, V
IT
= 0.5 V
CC
PARAMETER
TEST CONDITIONS
MIN
3.6
TYP
3.8
MAX
4.0
UNIT
V
Vhys
Low VCCthreshold voltage (hysteresis)
Low VCC threshold voltage (hysteresis)
Fault detected
Fault removed
3.9
4.1
4.3
V
VIT(short)
VIT(open)
MR-head short threshold voltage
Fault detected
50
mV
MR-head open threshold voltage
Fault detected
R(MR) = 20
,
II(BIAS) = 16 mA measured at
RDX/RDY
750
mV
VIT
Thermal-asperity detect threshold
voltage, base to peak
390
460
530
mV
fault-switching characteristics, L
I(TF)
= 180 nH, R
I(TF)
= 15
, f
I(W)
= 1 MHz to 65 MHz,
I
I(BIAS)
= 7 mA to 17 mA, R
(MR)
= 10
to 40
,
C
L
= 12 pF, V
IT
= 0.5 V
CC
PARAMETER
TEST CONDITIONS
Safe to unsafe
MIN
TYP
0.1
MAX
0.2
UNIT
μ
s
μ
s
MHz
μ
s
μ
s
μ
s
tt
Transition time thermal asperity detect
Transition time, thermal-asperity detect
Unsafe to safe
0.2
0.4
f(WDX/WDY)
Frequency, WDX/WDY for safe condition
1
Transition time, WDX/WDY frequency low
detect
Safe to unsafe
0.6
2.0
3.6
tt
Unsafe to safe
FF disabled
FF enabled
1.1
2.6
2.2 k
2.2 k
1000 pF
1000 pF
Measurement
Point
RDX
RDY
Figure 1. Read-Output-Measurement Circuit
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