HA12188AF

HA12188AF Pre-Amplifier and Servo IC for Quadruple-Speed CD-ROM ADE-207-183(Z) 1st. Edition October 1995 Description The typical values of built-in capacitances in this IC are reduced 10% compared with those in IC HA12188F. The values of Electrical Characteristics of this IC are same as those of IC HA12188F. Functions RF amplifier Focus error amplifier Tracking error amplifier FOK detector Mirror detector Defect detector APC amplifier Focus, tracking, and sled servo control Inner/outer direction detector Features Built-in variable resistors for adjusting tracking error EF balance, tracking gain, and focus gain Single power supply Supports double and quadruple speeds Few external components FP-56 package HA12188AF Block Diagram VCC 42 41 RS2 40 39 38 37 36 35 34 33 Mirror 32 31 30 29 Defect RS1 RFS – + Bias FOK – + 28 LDS 27 CLK 26 DATA 43 RF2 44 45 + + – RF1 – + FE Input I/F Logic 25 XLT 24 DC 23 XRST 22 SENS + – APC 46 47 + – + – + – VR Output I/F 21 COUT 20 DEFECT or DRT SLM DRIV. TR1 BAL 48 TR2 49 50 + – TM5 TM6 VR 19 SSA + – 18 VR 51 TE 52 53 54 FA 55 – + + – – + 17 TM2 TM3 TM4 THS Phase compen. TM7 TSA – + TZC – + FZC FS4 56 TM1 DS1 FLS DS2 Focus bias adj. 1 2 3 4 5 6 7 Phase compen. FPS ×2.7 TPS 16 TLS TAC DRIV. FS2 FS1 FSA – + ×2.7 15 VCC 8 9 10 + 11 12 13 14 FAC DRIV. The states of the IC’s internal switches at XRST = “L” are shown at block diagram. The black dot symbol of transf...