CXA3090N 查看數據表（PDF） - Sony Semiconductor

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CXA3090N

6ch. Read/Write Amplifier for Thin Film Head of Hard Disk Drive

Sony Semiconductor 

CXA3090N

Notes on operation

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

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

♦ Make the GND area as large as possible.

• When using as 2 or 4-channel, short-circuit the X and Y sides of unused head pins or leave them open.

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

Therefore, locate RWC 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

VTH=1.4V

VTH

GND

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

frequency becomes more than 1 MHz.

♦ 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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