Sony CXA3092N Datasheet

CXA3092N

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4ch. Read/Write Amplifier for Thin Film Head of Hard Disk Drive

Description

The CXA3092N is a Read/Write Amplifier for the
thin film head of hard disk drive and designed to
handle up to 4 channel heads.

Features

• Operate on single +5 V power supply

• Low power consumption

Read : 85 mW
Write : 115 mW + IW ×5
Idle : 8 mW

• Designed for two terminal thin-film or MIG heads

• Read amplifier emitter follower output featuring

325 times gain (typ).

• Differential input capacitance for Read : 6pF (typ)

• Input noise : 0.47 nV / √ Hz (typ)

• Write current range : 5 to 15 mA

• Differential Head voltage swing : 6.8 Vp-p (typ)

• Differential P-ECL write data input

• Built-in write unsafe detection circuit.

• Built-in Servo write function (2/4 ch).

• Built-in IC protection circuit for short of head to

GND.

• Read data outputs are high impedance in write

mode.

• Unselected head voltage is GND potential.

• Built-in supply voltage monitor circuit prohibits

incorrect write during power on or abnormal

voltage.

• Self switching damping resistance (RD = 350 Ω).

Absolute Maximum Ratings (Ta=25 °C)

• Supply voltage VCC 6V

•Write current IW 20 mAo-p

• Operating temperature Topr –20 to +75 °C

• Storage temperature Tstg –55 to +150 °C

• Allowable power dissipation

• WUS/SE pin input current

Recommended Operating Conditions

• Supply voltage VCC 5.0 V±10 %

• Write current IW 5 to 15 mAo-p

20 pin SSOP (Plastic)

PD 800 mW

ISEH 15 mA

Function

Read, Write and Write unsafe detection for HDD,

power supply ON/OFF detection.

Structure

Bipolar silicon monolithic IC

Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.

—1—

E96713-TE

Block Diagram and Pin Configuration

CXA3092N

GND

H0X

H0Y

H1X

H1Y

H2X

H2Y

1

20

XCS

MODE

CONTROL

2

3

DRIVER

AMP

WRITE

CURRENT

19

18

R/W

WC

SOURCE

4

DRIVER

AMP

5

6

AMP

DRIVER

17

16

15

RDY

RDX

HS0

HEAD

SELECT

7

AMP

14

HS1

H3X

H3Y

CC

V

10

8

DRIVER

13

WDX

IC

PROTECTOR

9

AMP

POWER
ON/OFF

DETECTOR

WRITE

UNSAFE

DETECTOR

12

11

WDY

WUS/SE

—2—

Pin Description

CXA3092N

No.

1

2
3
4
5
6
7
8
9

10

Symbol

GND

H0X
H0Y
H1X
H1Y
H2X
H2Y
H3X
H3Y

VCC

Equivalent circuit

2
4

6
8

2k 2k

VCC

Description

Head.

3
5

7
9

4 channels provided.

GND

5 V power supply.

11

12
13

WUS/SE

WDY
WDX

VCC

11

Write unsafe detection output /
Servo Enable signal input.

GND

VCC

12

13

GND

Differential P-ECL write data
input.

—3—

CXA3092N

No.

14
15

16
17

Symbol

HS1
HS0

RDX
RDY

Equivalent circuit

VCC

14
15

Head select signal input.
Selects one of 4 heads according

Description

to Table 2.

100k

16

2.1V
GND

VCC

Read Amplifier output.

17

GND

VCC

18

19

20

WC

R/W

XCS

A setting resistor for the write
current value is connected

18

2V

GND

VCC

100k

19

between this pin and GND.

Read/Write signal input
At “High” : Read,
at “Low” : Write.

2.1V
GND

VCC

20

Power save signal input
At “High” : Power save.

100k

2.1V
GND

—4—

CXA3092N

Refer to Fig.1

Min. Typ. Max. Unit

12 17 26 mA

2

Measurement conditions

Test point : l

17 23 36

mA

Test point : l2

V

0.8 V

1.0 1.6 2.3 mA

+IW +IW +IW

Test point : I2

2.0 V

Digital input :

Pins 17, 18, 19, 23

100 µA

–100 µA

“High” applied voltage : 5 V

“Low” applied voltage : 0 V

VWDH VWDH

Test point : l6, l7, l8, I9

VCC VCC

–2.0 –0.25

V

50 µA

–1.1 –0.4

Input voltage : 4 V

0.3 V

Output current : 1 mA

0.5 V

Test point : V1

50 µA

3

Test point : l

Electrical Characteristics (Unless otherwise specified, VCC=5 V, Ta=25 °C, Write current IW=15 mA)

SW conditions

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CCR

Symbol

I

Item

Current consumption

for Read

No.

1-1

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VIL

ICCI

ICCW

Current consumption

for Write

Current consumption

for idle

Digital input “Low”

input voltage

1-2

1-3

2-1

Digital input “High”

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IIL

VIH

input voltage

Digital input “Low”

input current

2-2

2-3

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IIH

VWDL

Digital input “High”

input current

Write data input

“Low” input voltage

2-4

2-5

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IWD

VWDH

Write data input

“High” input voltage

Write data

input current

Unselected

2-6

2-7

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Vunsel

2-8

VWUS

head voltage

Write unsafe output

saturation voltage

Write unsafe output

3-1

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IWUS

leak current

3-2

—5—

mA/mA

CXA3092N

Min. Typ. Max. Unit

CC is lowered from 5 V in

3.4 3.9 4.3 V

Measurement conditions

Write mode and IW does not flow

anymore, VCC voltage is set to

VTHOFF. When VCC is raised from 3

V and IW starts to flow, VCC voltage

When V

is set to VTHON.

515mAo-p

+1 +1.2

1.8 2 2.2 V

23.4 26 28.6

46.8 52 57.2

VCC VCC V

0.5 14 mA

275 325 375 V/V

V4

70 100 MHz

SG1

AV =

IW=AW • VWC/RWC

IW=KW/RWC

Servo write enabled

Servo write enabled

Input voltage SG1 :

1 mVp-p, 300 kHz

Load resistance (RDX, RDY) :

1 kΩ

Test point : V4 [Vp-p]

Frequency at which AV lowers

by 3 dB

SW conditions

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Symbol

Item

Supply power

No.

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TH

V

ON/OFF detector

threshold voltage

4

IW

Write current

5-1

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VWC

setting range

Write current voltage

5-2

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AW

KW

VSEH

Write current gain

Write current

setting constant

WUS/SE voltage

5-3

5-4

6-1

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ISEH

WUS/SE sink current

6-2

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AV

Read amplifier

differential voltage gain

7

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BW

Frequency band

width (–3 dB)

8

—6—