Information as of 2000-01-10
 Latest information online 

TDA5360; Pre-amplifier for hard disk drive with MR-Read / Inductive Write heads

• Description • Features • Applications • Datasheet • Find similar products

To be kept informed on TDA5360, subscribe to eNews.

Description

The +/- 5.0 volt pre-amplifier for HDD described here has been designed for 12 terminals, comprised of a SAL or GMR magneto-resistive reader and an inductive thin film writer. In read mode, the device operates as a low noise differential preamplifier which senses resistance changes in the MR element that correspond to flux changes on the disk. In write mode, the circuit operates as a thin film head current switchdriving the inductive element of the head.

The IC incorporates Read amplifiers with programmable gain and HF boosts, Write amplifiers, 3-wires Serial Interface, Digital-to-Analog Converters, Thermal Asperity Detector and Programmable Thermal Asperity Compresso, rreference and control circuits which operate on a Dual Supply Voltage of +/-5V (+/-10%).

The Read amplifier has programmable medium input impedance. The DC offset between the two terminals of the MR head is eliminated using on chip AC coupling. The bandwidth can be enhanced by using programmable high frequency gain-boost. 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 further.

The Write amplifier has a programmable current overshoot which may be added to the programmable steady state write current.

Fault protection is provided for a variety of read or write unsafe conditions. For added data protection, internal pull up resistors are connected to RWN, CS0,CS1,STWN, WDP and WDN pins and pull down resistors are connected to SEN, SDATA, SCLK, DRN and BFAST pins, to prevent accidental writing due to open lines and to ensure the device will power up in a non-writing condition.

On-chip Digital to Analog converters for MR bias current or power and Write current 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 operationnal. . Invalid head select codes disable the writer, select the dummy head and trigger the FLT output.

Features

• 12 channels design for Single-stripe (SAL and GMR) Read / Thin-film Write heads.
• Design target 350 Mbps, for d=0 (16 / 17) rate code.
• Differential Hybrid sense Reader architecture.
• MR element biased by direct programmable constant Power or constant Current.
• Voltage driven Writer architecture.
• MR read / inductive write heads biased at ground level.
• Short rise and fall time with near rail to rail voltage swing.
• Dual power supplies : +5.0 V and -5.0 V.
• On-chip AC couplings eliminate MR head DC and DC offset voltage.
• Programmable 3-wire Serial Port Interface for programming (3.3 V and 5 V TTL / CMOS compatible).
• Extensive programmability of Write current wave overshoot.
• Programmable voltage / current mode write data input.
• Programmable voltage / current mode read data output.
• Programmable Read gain.
• Programmable Reader input impedance.
• Thermal asperity detection with programmable threshold.
• Thermal asperity compression with extensive programmability.
• High spurious-noise rejections.
• Internal Dummy Head available for MR heads protection during switchings.
• FAST mode available for short Write to Read mode transient.
• Sleep, Standby, Active, Servo Track Write, and Test modes available.
• Support servo writing.
• Write / Read Fault detection with fault code read back register and Fault masking capability.
• Low power-supplies fault protections.
• Short Write to Read Recovery, including DC settling.
• On-chip digitizing of Temperature and MR element Resistance value.
• Vendor ID and chip revision register.
• Illegal Multiple Device Selected detection.
• 2 pads CS0 and CS1, hard wired, for separate activation for multiple pre-amplifiers operation.
• Requires one external resistor.

Applications

• Hard Disk Drive (HDD).

Datasheet

Type nr.	Title	Publication release date	Datasheet status	Page count	File size (kB)	Datasheet
TDA5360	Pre-amplifier for hard disk drive with MR-Read / Inductive Write heads	30-Jul-98	Objective Specification	34	198	Open

Find similar products:

 TDA5360 links to the similar products page containing an overview of products that are similar in function or related to the part number(s) as listed on this page. The similar products page includes products from the same catalog tree(s) , relevant selection guides and products from the same functional category.