CXA1940N Просмотр технического описания (PDF) - Sony Semiconductor

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производитель

CXA1940N

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

Sony Semiconductor 

CXA1940N

Application Notes

Use the following characteristics for reference.

Item

Differential output capacitance

Write mode

Differential output resistance

Sym-

bol

Conditions

CO

Between head input pins

RO

Differential input capacitance

Read mode Differential input resistance

CI Between head input pins

RI f=5MHz

Output resistance

RRD RDX or RDY, f=5MHz

Unselected head differential current in

Write mode

IUS

LH=1µH, RH=30Ω

Iw=20mA

Write current symmetry

∗TAS=T1—T2

TAS∗ LH=0µH, RH=0Ω

Iw=20mA

VCC=5V, Ta=25°C

Min. Typ. Max. Unit

15 pF

230 310 390 Ω

14 20 pF

0.7 1.4

kΩ

40 60 Ω

0.2 mAp-p

–1

1

ns

IWX+IWY 50%

T1

50%

T2

50%

Setting of Write current

Write current can be set with resistor Rw (kΩ) at Pin 18.

Iw=K/Rw (mA) Refer to Fig. 5 and 6.

WC

18

RW

Fig.5 Write current vs. RW

20

Fig. 6 Write current setting constant vs Write current

148

K=Rw • IW

146

10

144

5

5

10

20

30

RW (KΩ)

142

140

5

10

15

20

Write current IW (mA)

—14—

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