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TDA5153 Datasheet(PDF) 3 Page - NXP Semiconductors

Part No. TDA5153
Description  Pre-amplifier for Hard Disk Drive HDD with MR-read/inductive write heads
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 3 page
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1997 Jul 02
3
Philips Semiconductors
Preliminary specification
Pre-amplifier for Hard Disk Drive (HDD)
with MR-read/inductive write heads
TDA5153
1
FEATURES
• Designed for 4 (TDA5153BG) or 6 dual-stripe
MR-read/inductive write heads
• Current bias-current sense architecture
• Single supply voltage (5.0 V ±10%); a separate write
drivers supply pin can be biased from VCC to 8 V +10%
• MR elements connected to ground (GND)
• Equal bias currents in the two MR stripes of each head
• On-chip AC couplings eliminate MR head DC offset
• 3-wire serial interface for programming
• Programmable high-frequency zero-pole gain boost
• Programmable write driver compensation capacitance
• Programmable MR bias currents and write currents
• 1-bit programmable read gain
• Sleep, standby, active and test modes available
• Measurement of head resistances in test mode
• In test mode, one MR bias current may be forced to a
minimum current
• Short write current rise and fall times with near rail-to-rail
voltage swing
• Head unsafe pin for signalling of abnormal conditions
and behaviour
• Low supply voltage write-current inhibit (active or
inactive)
• Supports servo writing
• Provides temperature monitor
• Thermal asperity detection with programmable
threshold level
• Requires only one external resistor.
2
APPLICATIONS
• Hard Disk Drive (HDD).
3
GENERAL DESCRIPTION
The 5.0 V pre-amplifier for HDD described here is
designed for five terminals, dual stripe Magneto-Resistive
(MR)-read/inductive-write heads. The disks of the disk
drive are connected to ground. To avoid voltage
break-through between the heads and the disk, the MR
elements of the heads are also connected to ground. The
symmetry of the dual-stripe head-amplifier combination
automatically distinguishes between the differential
signals such as signals and the common-mode effects like
interference. The latter are rejected by the amplifier.
The IC incorporates read amplifiers, write amplifiers, serial
interface, digital-to-analog converters, reference and
control circuits which operate on a single supply voltage of
5V
±10%. The output drivers have a separate supply
voltage pin which can be connected to a higher supply
voltage of up to 8 V +10%. The complementary output
stages of the write amplifier allow writing with near
rail-to-rail peak voltages across the inductive write head.
The read amplifier has a low input impedance. The DC
offset between the two stripes of the MR head is eliminated
using on-chip AC coupling. Fast settling features are used
to keep the transients short. As an option, the read
amplifier may be left biased during writing so as to reduce
the duration of these transients even more. Series
inductance in the leads between the amplifier and MR
heads influences the bandwidth which can be
compensated by using a programmable high-frequency
gain-boost (HF zero). HF noise and bandwidth can be
attenuated using a programmable high-frequency
gain-attenuator (HF pole).
On-chip digital-to-analog converters for MR bias currents
and write currents are programmed via a 3-wire serial
interface. Head selection, mode control, testing and servo
writing can also be programmed using the serial interface.
In sleep mode the CMOS serial interface is operational.
Figure 1 shows the block diagram of the device.
4
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA5153X
naked die
TDA5153AG;
TDA5153BG
LQFP48
plastic low profile quad flat package; 48 leads; body 7
× 7 × 1.4 mm
SOT313-2




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