參數(shù)資料
型號(hào)： TLS24318
廠商： Texas Instruments, Inc.
英文描述： Magnetoresistive/Thin-Film Read/Write Preamplifiers(8通道磁阻/薄膜讀/寫(xiě)用前置放大器)
中文描述： 磁阻/薄膜讀/寫(xiě)前置放大器（8通道磁阻/薄膜讀/寫(xiě)用前置放大器）
文件頁(yè)數(shù)： 13/31頁(yè)
文件大?。?/td> 676K
代理商： TLS24318
TLS24308, TLS24310, TLS24318, TLS24320
8- AND 10-CHANNEL MAGNETORESISTIVE/THIN-FILM
READ/WRITE PREAMPLIFIERS
SQHS009 – JANUARY 1996
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended free-air temperature range, V
CC
= 5 V,
for R
(MR)
= 20
, I
I(BIAS)
= 16 mA, R
I(TF)
= 15
, L
I(TF)
= 180 nH, L
(lead)
= 50 nH, I
I(W)
= 25 mA,
f
I(W)
= 40 MHz
PARAMETER
TEST CONDITIONS
MIN
TYP
52
MAX
UNIT
ICC
Supply current
pp y
Read mode
62
Write mode
BHV/IBON = L
See equation (1) or (2)
BHV/IBON = H
See equation (3) or (4)
mA
Servo mode
See equation (5) or (6)
Idle mode
9
12
PD
Power dissipation
Read mode
260
341
Write mode, See Note 2
BHV/IBON = L
See equations (1) and (7)
or (2) and (8)
BHV/IBON = H
See equations (3) and (7)
or (4) and (8)
mW
Servo mode,
See Notes 2 and 3
See equations (5) and (7)
or (6) and (8)
Idle mode,
See Note 2
45
72
NOTES:
2. For applications requiring idle-to-write or servo-write switching, TI recommends that these switches be made while BHV/IBON is
high. Using this technique avoids a potential 20-mA increase.
3. During servo-write operation, the devices must operate such that the total power is less than the package power dissipation limit.
See principles of operation, servo write mode
Equation (1) is used to calculate typical supply current and equation (2) is used to calculate maximum supply
current when BHV/IBON is low.
I
CC
(typ)
1.2
I
I(W)
1.1
I
I(BIAS)
28
I
CC
(max)
Equation (3) is used to calculate typical supply current and equation (4) is used to calculate maximum supply
current when BHV/IBON is high.
I
CC
(typ)
1.2
I
I(W)
20
1.2
I
I(W)
1.1
I
I(BIAS)
42
I
CC
(max)
1.2
I
I(W)
30
Equation (5) is used to calculate typical supply current and equation (6) is used to calculate maximum supply
current when the preamplifier is operating in the servo mode.
I
CC
(typ)
1.2
(I
I(W)
number of heads turned on)
20
I
CC
(max)
1.2
(I
I(W)
number of heads turned on)
30
Equation (7) is used to calculate typical power dissipation and equation (8) is used to calculate maximum supply
current when the preamplifier is in the servo mode.
P
D
(typ)
I
CC
(typ)
V
CC
(typ)
P
D
(max)
I
CC
(max)
V
CC
(max)
Where:
Numerical current values are in mA.
I
CC
supply current is in mA.
I
I(W)
write current is in mA.
P
D
power dissipation is in mW.
V
CC
(typ) = 5 V
V
CC
(max) = 5.5 V
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
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