HA12220F

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 HA12220F Block Diagram 0.1µ 28 RF1 27 VCC BIAS RF2 1 + – EQ – + MIRH 19 RFS – + FSA FOK + – MIRR 18 HD49250 VCB 26 BYPS 10µ GND VCF 1µ 23 RFC AGCF 0.1µ HD49250 22 AGCO 21 DFH DEFECT DFT 20 HD49250 0.015µ 25 24 AGC Gain changing RF3 2 RF4 3 GND FE FVR2 + – FVR Offset FA FOK 17 HD49250 TR1 4 + – TR1 TVR + – TE TLPF + – TVR2 + – TA BAL TR2 5 + – TR2 TVR IIL Gain=8dB T...