1997 Jul 02

15

Philips Semiconductors

Preliminary specification

Pre-amplifier for Hard Disk Drive (HDD)

with MR-read/inductive write heads

TDA5153

Notes

1. Not used bits in the registers (indicated by X) are don’t care. Default data, initialized at power-up, is zero in all

LSB of the test mode register and b2 is the data bit d2 of the compensation register.

00110010

MR current DAC register:

01000010

write current DAC register:

01010010

servo write register:

(d0, d1) = (0, 0) = one head

(d0, d1) = (1, 1) = all heads

01100010

test mode register:

(d2,d1,d0) = (0,0,0) = not in test mode

(d2,d1,d0) = (0,1,1) = temperature monitor

(d2,d1,d0) = (1, X, d0) = thermal asperity detection

, see note 2

01110010

compensation capacitor register:

equivalent differential capacitance:

10000010

high frequency gain attenuator register:

nominal pole frequency:

10010010

high-frequency gain boost register:

nominal zero frequency:

10100010

settle time register:

settle time:

11110011

chip ID register:

, d3 to d0 are preset to (0, 0, 1, 1)

a7

a6

a5

a4

0011

when a0 = 1, data from the register with address a7 to a4 is read out on

SDATA

A7 A6 A5 A4 A3 A2 A1 A0

DESCRIPTION

I

MR

0.5

10 k

Ω

R

ext

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





×

10

16 d4

⋅

8d3

⋅

4d2

⋅

2d1

⋅

1d0

⋅

++

+

+

+

() mA

×

=

I

WR

10 k

Ω

R

ext

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





20

16 d4

⋅

8d3

⋅

4d2

⋅

2d1

⋅

1d0

⋅

+

+

+++

() mA

×

=

V

th

210

560 d0

⋅

280 b2

⋅

++

() µV

=

4d2

⋅

2d1

⋅

1d0

⋅

++

() 2pF

×

800 MHz

8d3

⋅

4d2

⋅

2d1

⋅

1d0

⋅

+++

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

800 MHz

8d3

⋅

4d2

⋅

2d1

⋅

1d0

⋅

+++

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

t

st

2

1

4d2

⋅

2d1

⋅

1d0

⋅

1

+++

()

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

µs

+

=

ID

8 d3

⋅

4d2

⋅

2d1

⋅

1d0

⋅

+++

=