TDA5155X Philips Semiconductors, TDA5155X Datasheet - Page 17

• Manufacturer Part Number: TDA5155X
• Description: Pre-amplifier for Hard Disk Drive HDD with MR-read/inductive write heads
• Manufacturer: Philips Semiconductors

Philips Semiconductors
Notes to the recommended operating conditions
1. A supply by-pass capacitor from V
2. The supply voltage V
3. The given values should be interpreted in the way that
1997 Apr 08
Pre-amplifier for Hard Disk Drive (HDD)
with MR-read/inductive write heads
low pass filter may be used to optimize the PSRR.
in normal mode, and two diode 1.4 V above V
servo mode.
the single ended voltage could swing from
0.2 to 0.75 V, and that the common mode voltage
should be such that for any of the two states, the
V
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
IH(PECL)
WDIx v
------------------------------------------------------------------------ -
is less than V
–
CC(WD)
200
WDIy v
CC
and V
must never be below V
–
IL(PECL)
1.4
CC
to ground or a
is more than
CC
in
CC
17
4. Same comments for the given values as for the
5. The mismatch refers to the resistance of the two
6. These parameters depend on the head model.
7. The combination of maximum head resistance, lead
voltage input mode. The HIGH (respectively LOW)
level input current is defined such that it produces the
same effect at the output of the writer (Wx, Wy) as the
HIGH (resp. LOW) level input voltage.
stripes of the same head. This is defined as follows:
The data given in the table are those used for testing.
resistance and bias current is not permitted. To avoid
voltage breakthrough between heads and disk, the
voltage over the MR elements is limited by two diode
voltages.
(R
MR
) = abs(R
MR1
R
MR2
).
Preliminary specification
TDA5155