TDA5360 datasheet(18/34 Pages) PHILIPS

18 / 34 page

1998 July 30

Philips Semiconductors

Objective Specification, Revision 2.2

Pre-Amplifier for Hard Disk Drive with

MR-Read / Inductive Write Heads

TDA5360

Reader Bandwith

HFZ3, HFZ2, HFZ1, HFZ0 = high frequency gain boost/ differentiator control

( Note 3 )

LFP1, LFP0 = low frequency pole.

(0,0) =1 MHz

(0,1) =2 MHz

(1,0) =3 MHz

(1,1) =4 MHz

Writer Bias Register

IW4, IW3, IW2, IW1, IW0 = 5 bits to define Iwr current :

Iwr = 10mA + 1.3mA*(IW0+2*IW1+4*IW2+8*IW3+16*IW4)

WCP2...WCP1 = 3 bits for the write current overshoot

(Note 4)

Thermal Asperity

Detection

TRANGE = if HIGH, the TA detector range is shifted up 3.17mV

TAD = if HIGH, the TA detection circuits are enabled

TAC = if HIGH, the TA Compression circuits are enabled

TAD4..TAD0 = 5 bits for TAD threshold programmation (referred to the input)

Vth(mV) =

0.390

+ 3.170*TRANGE

0.177*(TAD0 + 2*TAD1 + 4*TAD2+ 8*TAD3 + 16*TAD4)

(Note 5)

Vendor Register

VEND7...VEND0 = 8 bits for identification (read back only bits)

7 6 5 4 3 2 1 0

0 0 1 0 0 0 1 1 = rev1

0 1 0 0 0 0 1 1 = rev2

Fault Management

FLT2...FLT0 = 3 bits to set the reporting of a fault condition :

000 = report all fault detected

001 = Disable low supply fault

010 = Disable temperature too high fault

011 = Disable write head open/short fault

100 = Disable write data frequency too low fault

101 = disable MR power too high fault

110 = Disable TA Detected fault

111 = Disable all faults

FCOD3...FCOD0 = 4 bits for encoding the fault conditions (read back only bits)

( Note 7 )

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