TZA1000

INTEGRATED CIRCUITS DATA SHEET TZA1000 QIC read-write amplifier Preliminary specification Supersedes data of 1998 Mar 11 File under Integrated Circuits, IC01 1998 Mar 17 Philips Semiconductors Preliminary specification QIC read-write amplifier FEATURES 3-wire serial interface for programming On-chip Digital-to-Analog Converters (DAC) for: – MR (Magneto Resistive) sense bias current – MR DC bias current – Write current Low noise differential input stage: typically 0.65 nV/√Hz (Zi = 0 Ω) Magnetic feedback circuit to handle large output signals MR DC bias current circuit Very fast write current rise and fall times with near rail-to-rail voltage swing Maximum write current of 100 mA: ready for high coercivity tape Low noise read amplifier for reading track height servo signals with the write coil Very few external components required On board registers for easy format or bit rate selection Fast read-after-write recovery time Test circuit for yoke-type heads Switchable differentiator for yoke-type heads, with programmable cut-off frequencies Anti-aliasing low-pass filter, with programmable cut-off frequencies AGC (Automatic Gain Control) options: internally (digitally) controlled, externally controlled or fixed gain Hold input for fast AGC freeze GENERAL DESCRIPTION TZA1000 Input for fast reader/writer (track height servo) signal selection Power fail detection on both 5 and 12 V lines (status can be read from the read register) Write unsafe...