TZA1000 - NXP

TZA1000 QIC read-write amplifier

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 detection • Provides an accurate reference voltage (for AD conversion) • Very simple interconnection with the SZA1000 QIC digital equalizer • +5 V ±10% and +12 V ±10% supply v.

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 re.