Sony CXA3510N Datasheet

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E99201

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.

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

CXA3510N

Description

The CXA3510N 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

360 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 : 9 Vp-p (typ)

• IW Rise / Fall times : 3.7 ns (typ)

(LH=540 nH, RH=25 Ω, IW=10 mA)

• 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 = 360 Ω).

Function

Read, Write and Write unsafe detection for HDD,

power supply ON/OFF detection.

Structure

Bipolar silicon monolithic IC

20 pin SSOP (Plastic)

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

PD 620 mW

• WUS/SE pin input current ISEH 15 mA

Recommended Operating Conditions

• Supply voltage VCC 5.0 V±10 %

• Write current IW 5 to 15 mAo-p

For the availability of this product, please contact the sales office.

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CXA3510N

POWER ON/OFF

DETECTOR

DRIVER

AMP

DRIVER

MODE

CONTROL

WRITE

CURRENT

SOURCE

AMP

HEAD

SELECT

WRITE

UNSAFE

DETECTOR

PROTECTOR

H0X

H0Y

H1X

H1Y

H2X

H2Y

H3X

H3Y

GND

R/W

RDY

RDX

HS0

HS1

WDX

WDY

WUS/SE

XCS

AMP

DRIVER

AMP

Block Diagram and Pin Configuration

—3—

CXA3510N

Pin Description

No.

2 3 4 5 6 7 8 9

12 13

Symbol

GND

H0X H0Y H1X H1Y H2X H2Y H3X H3Y

VCC

WUS/SE

WDY WDX

Equivalent circuit

2k 2k

VCC

GND

2 4

6 8

3 5

7 9

100k

Description

Head. 4 channels provided.

5 V power supply.

Write unsafe detection output / Servo Enable signal input.

Differential P-ECL write data input.

VCC

GND

VCC

GND

—4—

CXA3510N

No.

14 15

16 17

Symbol

HS1 HS0

RDX RDY

R/W

XCS

Equivalent circuit

VCC

GND

14 15

100k

2.1V

VCC

GND

VCC

GND

2.5V

VCC

GND

100k

2.1V

VCC

GND

100k

2.1V

Description

Head select signal input. Selects one of 4 heads according to Table 2.

Read Amplifier output.

A setting resistor for the write current value is connected between this pin and GND.

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

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

—5—

CXA3510N

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

Refer to Fig.1

No.

1-1

1-2

1-3

2-1

2-2

2-3

2-4

2-5

2-6

2-7

2-8

3-1

3-2

Item

Current consumption

for Read

Current consumption

for Write

Current consumption

for idle

Digital input “Low”

input voltage

Digital input “High”

input voltage

Digital input “Low”

input current

Digital input “High”

input current

Write data input

“Low” input voltage

Write data input

“High” input voltage

Write data

input current

Unselected

head voltage

Write unsafe output

saturation voltage

Write unsafe output

leak current

Symbol

CCR

ICCW

ICCI

VIL

VIH

IIL

IIH

VWDL

VWDH

IWD

Vunsel

VWUS

IWUS

SW conditions

1 2 3 4 5 6 7 8 9 10 11 12 13 14

a a a a a b a a b a a b b a

a a a a a b a a b a a b a a

a a a a a b a a b a a b a b

a a a a a b a a b a a b a a

a a a a a b a a b b b b b b

a a a a a b a a b a a b a a

b a a a b b a c c c c b a a

a a a a a a a a b a a b a a

Measurement conditions

Test point : l

Test point : l2

Test point : I2

Digital input :

Pins 14, 15, 19, 20

“High” applied voltage : 5 V

“Low” applied voltage : 0 V

Test point : l6, l7, l8, I9

Input voltage : 4 V

Output current : 1 mA

Test point : V1

Test point : l

Min. Typ. Max. Unit

11 17 26 mA

16 22 36

+IW +IW +IW

1.0 1.6 2.3 mA

0.8 V

2.0 V

–100 µA

100 µA

VWDH VWDH

–2.0 –0.25

VCC VCC

–1.1 –0.4

50 µA

0.3 V

0.5 V

50 µA

—6—

CXA3510N

No.

5-1

5-2

5-3

5-4

6-1

6-2

Item

Supply power

ON/OFF detector

threshold voltage

Write current

setting range

Write current voltage

Write current gain

Write current

setting constant

WUS/SE voltage

WUS/SE sink current

Read amplifier

differential voltage gain

Frequency band

width (–3 dB)

Symbol

VWC

VSEH

ISEH

Measurement conditions

When V

CC is lowered from 5 V in

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

is set to VTHON.

IW=AW • VWC/RWC

IW=KW/RWC

Servo write enabled

Input voltage SG1 :

1 mVp-p, 300 kHz

Load resistance (RDX, RDY) :

1 kΩ

Test point : V4 [Vp-p]

AV =

SG1

Frequency at which AV lowers

by 3 dB

Min. Typ. Max. Unit

3.4 3.9 4.3 V

5 15 mAo-p

2.25 2.5 2.75 V

18 20 22

mA/mA

45 50 55

VCC VCC V

+1.5 +1.6

5 14 mA

305 360 415 V/V

100 140 MHz

SW conditions

1 2 3 4 5 6 7 8 9 10 11 12 13 14

b a a a a a b a a b a b a a

a a a a a b a a b a a b a a

b a a a a b a a b a a b a a

b a a a a b b a b a a b a a

b a a a c b a a b a a b b a

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