AN8847SB

ICs for Compact Disc/CD-ROM Player AN8847SB Head amplifier IC for CD-ROM drive (for 32 times speed or more) s Overview The AN8847SB is a head amplifier IC for digital servo. It can configure an efficient CD-ROM system in combination with the MN662753, and allows a full-automatic adjustment of tracking balance-gain-offset and focus balance-gain-offset with fewer external parts. Built-in functions are a variable equalizer, high band RF amp. and AGC which meet CAV playback with 32 times speed or more. 15.2±0.3 36 19 0.2 +0.10 –0.05 Unit: mm 11.93±0.3 8.4±0.3 1 18 1.30±0.25 2.85±0.2 1.30±0.25 s Features Variable equalizer which meets CAV playback with 32 times speed or more. Wide band RF amp. and AGC (fC = 30 MHz or more (−3 dB)) Balance adjustment function built-in Focus error amp./tracking error amp. CD-RW playback compatible. Variable gain Focus error amp./tracking error amp. (to +16.9 dB) OFTR/BDO detection APC amp. 0.3±0.11 0.8 Seating plane 0.1±0.1 SSOP036-P-0450A s Applications CD/CD-ROM drive 0.5 1 AN8847SB s Block Diagram ICs for Compact Disc/CD-ROM Player 15 COFTR 16 OFTR 26 FEN 27 FEOUT 22 VREF2 13 CBDO 14 BDO VREF1 LD 20 2 BDO 3TOUT 12 OFTR Amp. 1 PD 19 Standby LDON CEA 11 ENV detection 28 29 GCTRL FBAL NRFDET ARF CAGC RFC 17 10 RF AGC RFDET AC 9 8 Amp. 24 25 TEN TEOUT BCA BCA 30 BCA BCA TBAL GCA EQCTL RFOUT RFN 7 6 GCA EQ 23 GCA GCA VCC2 VCC1 GND RVCC RGND 21 18 3 5 ADD amp. Amp. 36 35 34 33 32...