HA12220F Datasheet, PDF (1/20 Pages) Hitachi Semiconductor – CD-ROM Drive Head Amplifier IC

HA12220F
CD-ROM Drive Head Amplifier IC
ADE-207-230 (Z)
Target Specification
1st. Edition
April 1997
Functions
• RF amplifier (Built-in equalizer changing circuit)
• Focus error amplifier (fc = 60kHz Typ)
• Tracking error amplifier (Built-in cut-off frequency changing circuit fc = 30kHz, 60kHz, 100kHz,
200kHz Typ)
• FOK detection circuit (Built-in Vth changing circuit)
• Mirror detection circuit
• Defect detection circuit
• APC amplifier
• RFAGC amplifier
Features
• Built-in variable resistors (+14 to –16% 2% steps) for adjusting tracking error EF balance
• Built-in variable resistors (–8 to +8dB 4dB steps) for rough adjusting tracking gain
• Built-in variable resistors (–8 to +8dB 4dB steps) for rough adjusting focus gain
• Built-in focus offset insertion circuit (–0.7 to +0.7V in 0.1V steps)
• RF amplifier frequency characteristics 30MHz (–3dB) in case of peaking off
• High-speed access support (The mirror circuit internal time constant can be switched between normal,
4× and 8× modes.)
• Support for CD-RW playback
• Few external components
• Available to set the stand-by mode
• FP-28TB package