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1998 July 30
Philips Semiconductors Objective Specification, Revision 2.2
Pre-Amplifier for Hard Disk Drive with
MR-Read / Inductive Write Heads
TDA5360
30
12.4 Switching Characteristics
Unless otherwise specified, recommended operating conditions apply
Notes:
1. The differential peak to peak voltage swing could be from 0.4V to 1.5V and the common mode should be such that
for any of the two states the maximum High shall be less than Vcc and the minimum LOW shall be more than 2.4V.
2. In current mode, a ratio of at least 5 sould exist between the HIGH and LOW level currents.
3. Whatever constant power is programmed, the value of the Imr current can not exceed the limits given in the constant
current mode.
4. The input referred noise voltage, excluding the noise of the MR resistor iis defined as follows :
PARAMETER CONDITIONS MIN TYP MAX UNIT
SI Serial Interface timing (Note 6)
t
RW
R/WN to Write Mode To 90% of write current 50 ns
SEN to Write Mode To 90% of write current 50 ns
t
WR
R/WN to Read Mode Reader outputs loaded with high-
pass single ended filters :
R=165Ω, C=270pF
Writer output shorted
(Note 7)
175 ns
t
CS
CS to Read Mode Reader outputs loaded with high-
pass single ended filters :
R=165Ω, C=270pF
1 us
t
HS
Head Switching Reader outputs loaded with high-
pass single ended filters :
R=165Ω, C=270pF
1 us
t
RI
CS to Unselect To 10% write current 50 ns
t
D1
Safe to Unsafe 50% WDP to 50% FLT
when a low frequency condition
occurs.
1 us
t
D2
Unsafe to Safe 50% WDP to 50% FLT 20 ns
t
D3
Head Current Propagation
Delay
From 50% of WDP to 50% of write
current, load=short
5 ns
T
RSET
MR Bias Current Settling
Time
I
MR
= 8mA, R
MR
=66Ω
(Note 8)
1 us
vn
2
vnout
Av
--------------
2
4 kTRMR×××–=