L6440 Datasheet, PDF (1/3 Pages) STMicroelectronics – 4-Channel ultra low power GMR-TMR preamplifier for HDD applications

L6440
4-Channel ultra low power GMR-TMR preamplifier
for HDD applications
Data Brief
Feature summary
■ Flip Chip package
■ 4-channel configuration
■ Dual Power Supplies of +3V, +20% -10%
and -2.1V, ±6%
■ Operating Temperature Range -25°C to +85°C
■ Supports xGMR heads from 50 to 500 Ohms
and perpendicular write heads
■ Data Rate up to 600Mb/s
■ Sleep mode power consumption < 200µW
■ Sleep-to-read recovery time < 500ns
■ Read mode power consumption < 60mW
(RMR=250Ohm, Ibias =400µA, NF<2dB)
■ Read Bandwidth (-3dB): 50kHz - 450MHz
■ Read Gain selectable from 20dB to 38dB
■ Write mode power consumption < 200 mW @
600Mb/s measured with single head 100%
Write mode duty cycle, 127b PRBS,
Iw = 40mA, OSC = 100mA (0-pk),
OSD = 500ps (PW50), with Heater off
■ Write voltage launched up to 6V differential
■ Accurate Flying Height Control using voltage or
power output
■ ESD diodes for MR head protection
■ Differential Current and Voltage Bias / Voltage
Sense architecture
■ Bi-directional 16-bit serial interface 2.5V and
3.3V CMOS compatible
Description
The L6440 is a BICMOS Silicon Germanium
monolithic integrated circuit differential
preamplifier for Ultra Low Power Hard Disk Drive
applications.
Order code
Flip Chip (Bumped die)
This part is specially designed to have minimum
dissipation in all the modes of operation (Sleep
<200mW, Read <60mW, Write <200mW) and
very fast Sleep to Read recovery time (S2R
<500ns).
It is designed for use with 4-terminal Giant
Magneto Resistance / Tunnel Magneto
Resistance read and Perpendicular write heads.
In read mode, the device consists of a fully
differential amplifier, offering: current or voltage
bias, voltage-sense input, programmable input
impedance, a wide-range read gain, low-noise
and high-bandwidth. In write mode, it includes fast
current switching differential write drivers, which
support data rates up to 600 Mb/s, overshoot
amplitude and duration programmability. In all the
modes of operations Fly Height Control circuit is
available. This circuit delivers an accurate
programmable voltage or power to a resistive
element near the write head to match write
current induced heating and subsequent
expansion or protrusion of the pole tip which
effect the media spacing.
The part is further comprehensive of an extensive
analog/digital measurement scheme for the read,
write, heater heads and die temperature, of an
extensive fault detection and reporting scheme,
thermal asperity detection and correction, write
degauss function.
Part number
L6440
Package
Flip Chip (Bumped die)
Operating temp. range
-25°C to +85°C
July 2006
Rev 1
For further information contact your local STMicroelectronics sales office.
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