cxa3090n Sony Electronics, cxa3090n Datasheet - Page 11

• Manufacturer Part Number: cxa3090n
• Description: 6ch. Read/write Amplifier For Thin Film Head Of Hard Disk Drive
• Manufacturer: Sony Electronics

Description Functions
Read amplifier
This is a low noise amplifier for amplifying the signals from the heads with an emitter follower output.
The RDX and RDY are the outputs of the differential amplifier whose polarity between the RDX and X side of
the head input is same.
Write circuit
The Write data input to WDX pin and WDY pin passes through the buffer amp. It drives the Write switch
circuit which supplies the Write current to the heads.
The Write current flows into the X side when WDX is “Low” and WDY is “High”.
Mode control
The mode are set as shown Table 1 by R/W and WUS/SE.
Head selection
The heads are selected as shown in Table 2 by the HS0, HS1 and HS2 pins.
Servo write mode
This mode allows for writing to multiple channels at once.
To enable servo write mode follow these steps:
(1) Place the device in the Read mode.
(2) Set HS0 and HS1 following Table 3.
(3) Set WUS/SE to V
(4) While maintaing step (2) and (3) above make R/W low, placing the device in servo write mode.
SEH
R/W
H
L
L
HS0
, or input I
H
H
H
L
L
L
WUS/SE
SEH
X
X
to WUS/SE.
Table 2. Head selection
Table 1. Mode selection
HS1
H
H
L
L
L
L
HS0
See Table 3
—11—
See Table 2
HS1
HS2
H
H
L
L
L
L
HS2
X
Servo Write
Head
Mode
Read
Write
0
1
2
3
4
5
CXA3090N