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TDA5153

Pre-amplifier for Hard Disk Drive (HDD) with MR-read/inductive write heads

Philips Electronics 

Philips Semiconductors

Pre-amplifier for Hard Disk Drive (HDD)

with MR-read/inductive write heads

Preliminary specification

TDA5153

SYMBOL

PARAMETER

CONDITIONS

MIN. TYP. MAX. UNIT

Io(max)(dif)

Vo(cm)

∆--∆---V-V---o-C-c--C-m--

maximum differential output

current

common mode output voltage in

read mode

RDx, RDy

common mode DC supply rejection

in read mode

−

4

−

mA

1.0 1.5 2.0 V

−

20

−

dB

Zo(n)(dif)

differential output impedance in

other modes (write, standby, sleep)

−

50

−

kΩ

Write characteristics

IWR

∆IWR

Vs(max)(p-p)

Ro(dif)

tr, tf

tas

tpd

αcs

write current adjust range (in the

write drivers)

tolerance (excluding Rext);

-I-W-----R-I--R--–--W--I--R-(--P-W--R---)(--P---R---)

maximum voltage swing

(peak-to-peak value)

differential output resistance

write current rise/fall time without

flip-flop (10% to 90%); note 8

write current asymmetry; note 9

propagation delay 50% of

(WDIx/WDIy) to 50% of (Wx, Wy)

channel separation

Rext = 10 kΩ; 1 mA steps

20

IWR(PR) = 35 mA

−

VCC(WD) = 5 V

−

VCC(WD) = 8 V (differential)

−

−

VCC(WD) = 8 V; Lh = 150 nH,

−

Rh = 10 Ω; IWR = 35 mA;

f = 20 MHz

percentage of tr/tf

−

(tr, tf and logic asymmetry)

write head short circuited; data −

flip-flop by passed

unselected head

−

35

51

mA

±7

−

%

−

8

V

−

13

V

200 −

Ω

−

1.8 ns

−

5

%

−

5

ns

45

−

dB

Switching characteristics

fSCLK

∆Vo(cm)

trec(W-R)

tsw(R)

toff(R)

serial interface clock rate

−

output common mode DC voltage IMR = 10 mA; IWR = 35 mA

−

change from Read to Write modes

write to read recovery time

(AC and DC settling); note 10

from 50% of the rising edge of

R/W to steady state read-back

signal: AC and DC settling at

90% (without load at

RDx − RDy)

read amplifier OFF: d5 = 0 −

read amplifier ON: d5 = 1 −

head switching (in read mode),

standby to read active and MR

current change recovery time;

(AC and DC settling); note 11

from falling edge of SEN to

−

steady state read-back signal;

(without load at RDx − RDy)

read amplifier off time

from falling edge of R/W to

−

read head inactive

−

25

200 −

MHz

mV

3

4.5 µs

100 150 µs

3

4.5 µs

−

50

ns

1997 Jul 02

20

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