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CXA1940N

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

Sony Semiconductor 

CXA1940N

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

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

Description

The CXA1940N is a Read/Write Amplifier for the

thin film head of hard disk drives and designed to

handle up to 4-channel heads.

20 pin SSOP (Plastic)

Features

• Operate on single +5V power supply.

• Low power consumption.

Read : 95mW

Write (IW=20mA) : 130mW+IW × 5

Power save : 5.5mW

• Write current can be varied through an external

resistor. Built-in stabilizing circuit provides stable

current during voltage and temperature drift.

• Drives up to 4 heads.

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

• Built-in power save function.

• Read amplifier emitter follower output featuring

290 times gain (Typ.).

• Built-in Write unsafe detection circuit.

• Built-in supply voltage monitor circuit prohibits

incorrect Write during power on or abnormal

voltage.

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

GND.

• Differential input capacitance for Read : 14pF

(Typ.).

• Write data input minimum pulse width : 10ns

• Read data output become high impedance in write

mode to improve read data offset when switching

from write to read mode.

• Unselected head DC voltage is GND potential.

• Self switching damping resistance (RD=310Ω)

Block Diagram and Pin Configuration

GND 1

H0X 2

H0Y 3

H1X 4

H1Y 5

H2X 6

H2Y 7

H3X 8

H3Y 9

NC 10

DRIVER

AMP

DRIVER

AMP

DRIVER

AMP

DRIVER

AMP

IC

PROTECTOR

MODE

CONTROL

WRITE

CURRENT

SOURCE

AMP

HEAD

SELECT

POWER

ON/OFF

DETECTOR

T-FF

WRITE

UNSAFE

DETECTOR

20 PS

19 R/W

18 WC

17 RDY

16 RDX

15 HS0

14 HS1

13 VCC

12 WDI

11 WUS

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.

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E93X03-TE

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