TDA5155 Datasheet, PDF (19/24 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
TDA5155
SYMBOL
PARAMETER
CONDITIONS
MIN.
DR
V_O(R)(dif)
Z_o(R)
I_o(max)(dif)
V_o(cm)
-^∆---V_∆----V^o----⁽_C--^c--_Cm----⁾-
Z_o(n)(dif)
rejection ratio of SCLK and
SDATA; note 6
from SCLK, SDATA inputs to the −
RDx-RDy outputs; a 200 mV
(peak-to-peak) signal is applied
to SCLK or SDATA inputs at
25 MHz, and measurement is
performed at RDx-RDy
output DC offset voltage in DC voltage between RDx and −
read mode (differential
RDy
after DC settling)
output impedance in read single ended
−
mode
maximum differential
−
output current
common mode output
RDx, RDy
1.0
voltage in read mode
common mode DC supply
−
rejection ratio in read mode
differential output
−
impedance in other modes
(write, standby, sleep)
Write characteristics
I_WR
∆I_WR
V_s(max)(p-p)
R_o(dif)
C_o(dif)
t_r, t_f
t_as
t_pd
α_cs
write current adjust range
(in the write drivers)
tolerance (excluding R_ext)
maximum voltage swing
(peak-to-peak value)
differential output
resistance
differential output
capacitance
write current rise/fall time
without flip-flop
(10% to 90%); note 7
write current rise/fall time
asymmetry; note 8
propagation delay 50% of
(WDIx/WDIy) to 50% of
(Wx, Wy)
channel separation
R_ext = 10 kΩ; 1 mA steps
20
I_WR programmed at 35 mA
−
V_CC(WD) = 5 V
−
V_CC(WD) = 8 V (differential)
−
−
not including the head
−
capacitance
L_h = 150 nH; R_h = 10 Ω;
I_WR = 35 mA; f = 20 MHz
V_CC(WD) = 8.0 V
−
V_CC(WD) = 6.5 V
−
percentage of t_r or t_f (t_r or t_f and −
logic asymmetry)
write head short-circuited, data −
flip-flop by-passed
not-selected head
−
TYP.
50
−
16
4
1.5
20
50
35
±7
−
−
200
5
−
−
−
−
45
MAX.
−
±0.2
−
−
2.0
−
−
51
−
8
13
−
−
1.8
2.1
5
5
−
UNIT
dB
V
Ω
mA
V
dB
kΩ
mA
%
V
V
Ω
pF
ns
ns
%
ns
dB
1997 Apr 08
19