TDA5153 datasheet(18/28 Pages) PHILIPS

18 / 28 page

1997 Jul 02

Philips Semiconductors

Preliminary speciﬁcation

Pre-ampliﬁer for Hard Disk Drive (HDD)

with MR-read/inductive write heads

TDA5153

12 RECOMMENDED OPERATION CONDITIONS

Notes

1. A supply by-pass capacitor from VCC to ground or a low-pass filter may be used to optimize the PSRR.

2. The supply voltage VCC(WD) must never be below VCC in normal mode, and two diode voltages above VCC in servo

mode.

3. The given values should be interpreted in such a way that the single-ended voltage could swing 0.2 to 0.75 V and

that the common mode voltage should be such that for any of the two states, VIH(max) <VCC and VIL(min) > 1.5 V.

PECL voltage swing: a wider peak-to-peak voltage swing can be used. In that case a current will flow through the

WDI inputs. This current is approximately equal to

4. The mismatch refers to the resistance of the two stripes of the same head. This is defined as follows:

∆R

MR = RMR1 − RMR2

5. These parameters depend on the head model. The values given are those used for testing.

6. The combination of maximum head resistance, lead resistance and bias current is not permitted. To avoid voltage

break-through between heads and disk, the voltage over the MR elements is limited by two diodes.

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP

MAX.

UNIT

VCC

supply voltage range

note 1

4.5

−

5.5

VCC(WD)

write driver supply voltage

note 2

VCC

−

8.8

VIH

HIGH level input voltage (CMOS)

3.5

−

VCC

VIL

LOW level input voltage (CMOS)

−

0.8

Vi(dif)(p-p)

differential input voltage

(peak-to-peak value)

note 3

0.4

0.7

1.5

VIH(PECL)

HIGH level PECL input voltage

note 3

1.5

2.85

VCC

VIL(PECL)

LOW level PECL input voltage

note 3

−

2.15

−

Tamb

ambient temperature

−

°C

junction temperature

reading

−−

110

°C

writing (VCC(WD) =8V)

−−

130

°C

RMR

MR element resistance

Ω

∆R

RMR mismatch

note 4

−−

Ω

Ll(tot)

total lead inductance to the head

in each lead; note 5

−

Rl(tot)

total lead resistance to the head

in each lead; note 5

−

1.5

−Ω

VMR

voltage on top of MR elements

note 6

−−

0.5

Vsig(dif)(p-p) differential MR head input signal

(peak-to-peak value)

0.4

Lwh

write head inductance

including lead; note 5

−

0.15

−µH

Rwh

write head resistance

including lead; note 5

−

−Ω

Cwh

write head capacitance

including lead; note 5

−

Rext

external reference resistor

−

Ω

ref

ext

-----------

WDIx

WDIy

–

() 1.4

–

200

-----------------------------------------------------------

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