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參數(shù)資料
| 型號： | MB4138 |
| 廠商： | Fujitsu Limited |
| 英文描述： | Read/Write Amplifier(讀/寫放大器) |
| 中文描述： | 讀/寫放大器（讀/寫放大器） |
| 文件頁數(shù)： | 4/18頁 |
| 文件大?。?/td> | 138K |
| 代理商： | MB4138 |
MB4138
4
Pin No.
Function
Chip select pin.
Control signal input pin. Sets the IC to the operating or idle state. An "L" level input sets the
IC to "operating".
Read/write mode selection pin
Output pin for the MR head voltage function. Outputs the same voltage as the bias voltage
for the MR heads.
Head connection pins for channels 0 to 5. Pins W0X, W0Y, etc. are for the thin film write
heads for each channel. Pins R0X, R0Y, etc. are for the MR read heads for each channel.
The MR head bias current flows from the R0X pin to the R0Y pin. The read signals are input
to a differential amplifier.
Capacitor connection pins. A 0.033
μ
F capacitor is typically connected between these pins.
The capacitor cuts the DC component that occurs when a bias current flows through an MR
head.
Ground pin. Connect to ground.
Capacitor connection pins. Connect a 0.033
μ
F capacitor between these pins. The capacitor
cuts the DC component due to the bias current flowing through the MR heads.
Capacitor connection pin. Connect a 0.1
μ
F capacitor between this pin and ground. The
capacitor stabilizes the current source circuit and reduces noise.
ON/OFF switching pin for the MR head bias current in write mode. Normally fix this pin at the
"L" level (bias current ON) to reduce the duration of the transient when switching from write
mode to read mode.
Resistor connection pin for setting the write current.
Resistor connection pin for setting the MR head bias current.
Differential amplifier output pins for the read data. As the output is an open-collector type,
connect 100
resistors between each of these pins and V
CC
.
Write fault detect pin. Outputs an "H" level when a write fault occurs. As the output is an
open-collector type, connect a pull-up resistor.
Write data differential input pins. The input level is pseudo-ECL.
Input the differential signals to these pins.
Ground pin. Connect to ground.
Power supply pin. Connect to a +5.0V supply.
Capacitor connection pin. Connect a 0.1
μ
F capacitor between this pin and V
CC
. The capaci-
tor stabilizes the current source circuit and reduces noise.
Channel 0 to 5 head select pins. See the "
I
Functions" section for the decoding logic. The
input level is TTL.
Symbol
I
PIN DESCRIPTION
CS
1
2
R/W
VHR
W0X, W0Y
R0X, R0Y
W1X, W1Y
R1X, R1Y
to
W5X, W5Y
R5X, R5Y
4 to 11,
14 to 17,
20 to 23
26 to 33
3
C3X
12
C3Y
13
GND
C4X
C4Y
C1
19
24
25
34
RS
35
WC
36
RC
RDX
37
38
39
40
RDY
WUS
WDX
WDY
GND
41
42
43
V
CC
44
C2
45
HS0, HS1,
HS2
46 to 48
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