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)
tRW R/WN to Write Mode To 90% of write current 50 ns
SEN to Write Mode To 90% of write current 50 ns
tWR 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
tCS CS to Read Mode Reader outputs loaded with high-
pass single ended filters :
R=165Ω, C=270pF
1us
tHS Head Switching Reader outputs loaded with high-
pass single ended filters :
R=165Ω, C=270pF
1us
tRI CS to Unselect To 10% write current 50 ns
tD1 Safe to Unsafe 50% WDP to 50% FLT
when a low frequency condition
occurs.
1us
tD2 Unsafe to Safe 50% WDP to 50% FLT 20 ns
tD3 Head Current Propagation
Delay From 50% of WDP to 50% of write
current, load=short 5ns
TRSET MR Bias Current Settling
Time IMR = 8mA, RMR =66Ω
(Note 8)
1us