Sony CXA3188N Datasheet

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E98128-TE

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.

Absolute Maximum Ratings (Ta=25 °C)

• Supply voltage VCC 6V

•Operating temperature Topr –20 to +70 °C

• Storage temperature Tstg –55 to +150 °C

• Allowable power dissipation (on board)

PD 760 mW

• Write current IW 22 mA

• WUS/SE pin input current

ISEH 15 mA

Operating Conditions

Supply voltage VCC 5±0.5 V

Description

The CXA3188N is a Read/Write Amplifier for the
thin film head of hard disk drive and designed to
handle up to 2 channel heads.

Features

• Operate on single +5 V power supply

• Low power consumption

Read : 90 mW
Write : 115 mW + IW × 5
Idle : 8 mW

• Designed for two terminal thin-film or MIG heads.

• Read amplifier emitter follower output featuring

200 times gain(typ).

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

• Input noise : 0.47 nV / √ Hz (typ)

• Write current range : 10 to 20 mA

• Differential Head voltage swing : 9 Vp-p (typ)

• Differential P-ECL write data input.

• Built-in write unsafe detection circuit.

• Built-in Servo write function.

• Read data outputs are high impedance in write

mode.

• Unselected head voltage is high impedance.

• Self switching damping resistor 380 Ω.

• Built-in supply voltage monitor circuit prohibits

incorrect write during power on or abnormal

voltage.

Function

Read, Write and Write unsafe detection for HDD,

power supply ON/OFF detection.

Structure

Bipolar silicon monolithic IC

2ch. Read/Write Amplifier for Thin Film Head of Hard Disk Drive

16 pin SSOP (Plastic)

CXA3188N

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

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CXA3188N

WC

RDY

RDX

HS

WDX

WDY

XCS

R/W

H0X

H0Y

H1X

H1Y

GND

V

CC

NC

WUS/SE

MODE

CONTROL

WRITE

CURRENT

SOURCE

HEAD

SELECT

AMP

AMP

DRIVER

DRIVER

POWER
ON/OFF

DETECTOR

WD BUF

AMP

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

WRITE

UNSAFE

DETECTOR

Block Diagram and Pin Configuration

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CXA3188N

Pin Description

No.

1

2
3
4
5

6
7

8

9

10

Symbol

GND

H0X
H0Y
H1X
H1Y

VCC

NC

WUS/SE

WDY
WDX

Equivalent circuit

2k 2k

VCC

GND

100k

4

2

3
5

Description

Head.
2 channels provided.

5 V power supply.

Write unsafe detection output /
Servo Enable signal input.

Differential P-ECL write data
input.

VCC

GND

8

VCC

GND

9

10

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CXA3188N

No.

11

12
13

14

15

16

Symbol

HS

RDY
RDX

WC

R/W

XCS

Equivalent circuit

VCC

GND

2.1V

11

180k

VCC

GND

12

13

VCC

GND

2.5V

14

VCC

GND

2.1V

15

180k

VCC

GND

100k

2.1V

16

Description

Head select signal input.
At “Low” : Head0
at “High” : Head1

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.

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CXA3188N

Electrical Characteristics (Unless otherwise specified, VCC=5 V, Ta=25 °C, Write current IW=20 mA)

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 current

Write data input voltage range

WD input amplitude
Power supply ON/OFF detector

threshold voltage
Write current setting range

Write current voltage

Write current gain

Write current setting constant
Write unsafe output

leak current
Write unsafe output
Low voltage

WUS/SE input current

WUS/SE High input voltage

Symbol

ICCR

ICCW

ICCI

VIL

VIH

IIL

IIH

IWD

VWDV

VWDA

VTH

IW

VWC

AW

KW

IWUS

VWUSL

ISEH

VSEH

Test condition

IW=20 mA

“H” applied voltage: 5 V
“L” applied voltage: 0 V

IW=AW • VWC/RWC
When write current is “Iw[mA]”,

IW=KW/RWC. (RWC=3.3 kΩ)

Output current: 1 mA

Servo write Enabled

Servo write Enabled

Min. Typ. Max. Unit.

11 18 25 mA
14 23 33

mA

+IW +IW +IW

1.1 1.6 2.1 mA

0.8 V

2.0 V

–100 µA

100 µA

50 µA

VCC–2.5 VCC V

0.3 1 V

3.4 3.9 4.3 V

10 20 mAo-p

2.25 2.5 2.75 V

18 20 22 mA/mA

46 51 56

50 µA

0.5 V

5 14 mA

VCC VCC

V

+1.5 +1.6