tda5155 NXP Semiconductors, tda5155 Datasheet - Page 13

• Manufacturer Part Number: tda5155
• Description: Pre-amplifier For Hard Disk Drive Hdd With Mr-read/inductive Write Heads
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Notes
1. Unused bits in the registers (indicated by X) are don’t care. Default data, initialized at Power-up, is zero in all
2. V
1997 Apr 08
0
0
0
0
0
0
0
0
1
1
A7 A6 A5 A4 A3 A2 A1 A0
Pre-amplifier for Hard Disk Drive (HDD)
with MR-read/inductive write heads
registers. For V
is the LSB of the test mode register and d2 is the d2 data bit of the compensation capacitor register.
th
X
X
X
X
X
X
X
X
X
X
ADDRESS REGISTERS
programming uses both the test mode register and the compensation capacitor register. d0 in the formula above
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
CC
0
0
0
0
0
1
1
1
1
a3 a2 a1 a0 when a7 = 1, data from the register with address a3 to a0 is read out on
<2.5 V, the register contents are not guaranteed.
0
1
1
1
1
0
0
0
1
1
0
0
1
1
0
0
1
1
(1)
1
0
1
0
1
0
1
0
1
MR current DAC register:
write current DAC register:
servo write register:
test mode register:
compensation capacitor register:
high frequency gain attenuator register
high frequency gain boost register
settle time register
device ID register
SDATA
I
I
MR
WR
(d0,d1) = (0,0): one head
(d0,d1) = (1,1): all heads
(d0,d1) = (1,0): odd numbered heads (H1, H3, H5, H7 and H9)
(d0,d1) = (0,1): even numbered heads (H0, H2, H4, H6 and H8)
(d2,d1,d0) = (0,0,0) = not in test mode
(d2,d1,d0) = (0,0,1) = read head test (I
(d2,d1,d0) = (0,1,0) = read head test (I
(d2,d1,d0) = (0,1,1) = temperature monitor
(d2,d1,d0) = (1,X,d0) = thermal asperity detection, see note 2
V
equivalent differential capacitance = (4.d2 + 2.d1 + 1.d0)
nominal pole frequency =
nominal zero frequency =
settle time:
ID = 8.d3 + 4.d2 + 2.d1 + 1.d0; d3 to d0 are preset to (0,0,1,1)
th
=
=
= (210 + 560.d0 + 280.d2) V
0.5
10k
-------------- - 20
R
ext
10k
-------------- - 10
R
t
st
ext
=
+
13
16.d4
2 s
+
+
16.d4
+
------------------------------------------------------------------ - s
4.d2
8.d3
-------------------------------------------------------------------- -
8.d3
-------------------------------------------------------------------- -
8.d3
+
+
FUNCTION
8.d3
+
+
+
2.d1
4.d2
4.d2
4.d2
800 MHz
800 MHz
1
+
+
4.d2
+
MR1
MR2
+
+
1.d0
2.d1
2.d1
2.d1
= I
= 5 mA fixed)
+
+
+
2.d1
MR2
+
+
1
d0
1.d0
1.d0
)
+
mA
d0
Preliminary specification
mA
2 pF
TDA5155