The L6326 is a two channel BICMOS monolithic integrated circuit GMR pre-amplifier designed for use with four-terminal magneto-resistive (AMR and GMR heads) read/inductive write heads. The device consists of a voltage sense current bias or voltage bias (selectable), single ended input/ true differential output (RDX, RDY), low-noise high bandwidth read amplifier and includes fast current switching write drivers which support data rates up to 500 Mb/s with 90nH write heads.
The GMR pre-amplifier provides programmable read current/voltage bias and write current (5 bit DACs), fault detection circuitry and servo writing features. Read amplifier gain, write current wave shape (overshoot and damping) can be adjusted and a thermal asperity detection and correction circuit can be enabled and programmed with different thresholds (6 bit DAC) through a 16-bit bi-directional serial interface (SDEN, SDATA, SCLK). The device operates from a +5V supply and a +8V supply (typical) for the write drivers. No external components are required if the internal trimmed resistor for reference current setting is selected.
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