CXA1940N Ver la hoja de datos (PDF) - Sony Semiconductor

Número de pieza

componentes Descripción

Fabricante

CXA1940N

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

Sony Semiconductor 

CXA1940N

Notes on operation

• This device handles high frequency and high gain signals. Please note the following;

♦ Connect VCC decoupling capacitor of approximately 1000pF near the device.

♦ Make the GND area as large as possible.

• When using as 2-channel, short-circuit the X and Y sides of unused head pins or leave them open.

• Write data pulse width

Set the pulse width to 10ns or more at 1.5V to prevent misoperation.

• The WC pin is a constant voltage pin. When noise affects this pin, it creates noise in Write current.

Therefore, locate RW as close to the device as possible .

• Write unsafe detection circuit

This circuit uses the voltage waveforms of the head pins for detection.

Wave form of write data

Voltage waveform

of head pins (HX, HY)

VFB

1.5V

T1

VTH=2V

VTH

GND

♦ The condition of T1 >10ns must be met for the WUS detection circuit to operate properly.

♦ VFB must be more than 2V. When VFB < 2V, it is possible that Write unsafe detection maximum

frequency becomes more than 1MHz.

♦ The normal operating area of write unsafe detection circuit is changed by head inductance, head DC

resistance, write current and other.

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