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

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CXA1940N

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

Sony Semiconductor 

CXA1940N

Description Functions

Read amplifier

This is a low noise amplifier amplifying the signals from the head and is an emitter follower output. It outputs

to RDX and RDY pins differentially. The head X side and RDX pin, the head Y side and RDY pin have the

same polarity. RDX, RDY outputs become high impedance in write mode (when these outputs is AC coupled

to the load).

Write circuit

Write data which is input to WDI pin passes through a T flip-flop and frequency is divided into 1/2. It then

drives the Write switch circuit and flows Write current to the head.

Write data is triggered where from “High” to “Low” and Write current is switched.

Write current flows from X side when Read changes to Write.

Mode control

Modes are set as shown in Table 1 using R/W and PS pins.

R/W

PS

Mode

L

L

Write

H

L

Read

H

H

Power save

Table 1. Mode selection

Head selection

Heads are selected as shown in Table 2 using HS0 and HS1 pins.

HS0

HS1

L

L

H

L

L

H

H

H

Head

0

1

2

3

Table 2. Head selection

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