CD-ROM Drive Head Amplifier
HA12220F
CD-ROM Drive Head Amplifier IC
ADE-207-230 (Z) Target Specification 1st. Edition April 1997 Functions
• RF amp...
Description
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...
Similar Datasheet