TDA5153 Datasheet, PDF (18/28 Pages) NXP Semiconductors – Pre-amplifier for Hard Disk Drive HDD with MR-read/inductive write heads

Philips Semiconductors
Pre-amplifier for Hard Disk Drive (HDD)
with MR-read/inductive write heads
Preliminary specification
TDA5153
12 RECOMMENDED OPERATION CONDITIONS
SYMBOL
PARAMETER
V_CC
V_CC(WD)
V_IH
V_IL
V_i(dif)(p-p)
supply voltage range
write driver supply voltage
HIGH level input voltage (CMOS)
LOW level input voltage (CMOS)
differential input voltage
(peak-to-peak value)
V_IH(PECL)
V_IL(PECL)
T_amb
T_j
HIGH level PECL input voltage
LOW level PECL input voltage
ambient temperature
junction temperature
R_MR
∆R_MR
L_l(tot)
R_l(tot)
V_MR
V_{sig(dif)(p-p)}
MR element resistance
R_MR mismatch
total lead inductance to the head
total lead resistance to the head
voltage on top of MR elements
differential MR head input signal
(peak-to-peak value)
L_wh
write head inductance
R_wh
write head resistance
C_wh
write head capacitance
R_ext
external reference resistor
CONDITIONS
note 1
note 2
note 3
MIN.
4.5
V_CC
3.5
0
0.4
note 3
1.5
note 3
−
0
reading
−
writing (V_CC(WD) = 8 V) −
15
note 4
−
in each lead; note 5
−
in each lead; note 5
−
note 6
−
0.4
including lead; note 5 −
including lead; note 5 −
including lead; note 5 −
I_ref = _R-V----er--^e-_x--^ft
−
TYP
−
−
−
−
0.7
2.85
2.15
−
−
−
28
−
35
1.5
−
1
0.15
10
5
10
MAX.
5.5
8.8
V_CC
0.8
1.5
UNIT
V
V
V
V
V
V_CC
V
−
V
70
°C
110
°C
130
°C
34
Ω
4
Ω
−
nH
−
Ω
0.5
V
2
mV
−
µH
−
Ω
−
pF
−
kΩ
Notes
1. A supply by-pass capacitor from V_CC to ground or a low-pass filter may be used to optimize the PSRR.
2. The supply voltage V_CC(WD) must never be below V_CC in normal mode, and two diode voltages above V_CC in servo
mode.
3. The given values should be interpreted in such a way that the single-ended voltage could swing 0.2 to 0.75 V and
that the common mode voltage should be such that for any of the two states, V_IH(max) < V_CC and V_IL(min) > 1.5 V.
PECL voltage swing: a wider peak-to-peak voltage swing can be used. In that case a current will flow through the
WDI inputs. This current is approximately equal to --⁽--W------D-----I--x-----^–---2-W---0---0D-----I--y----⁾----^–-----1---.--4-
4. The mismatch refers to the resistance of the two stripes of the same head. This is defined as follows:
∆R_MR = R_MR1 − R_MR2
5. These parameters depend on the head model. The values given are those used for testing.
6. The combination of maximum head resistance, lead resistance and bias current is not permitted. To avoid voltage
break-through between heads and disk, the voltage over the MR elements is limited by two diodes.
1997 Jul 02
18