Head amplifier
ICs for Compact Disc/CD-ROM Player
AN8849SB
Head amplifier IC for CD-ROM drive (for 24 times speed or more)
s Overview
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Description
ICs for Compact Disc/CD-ROM Player
AN8849SB
Head amplifier IC for CD-ROM drive (for 24 times speed or more)
s Overview
The AN8849SB is a head amplifier IC for digital servo. It can configure an efficient CD-ROM system in combination with the MN662752, 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, wide band RF amp. and AGC which meet CAV playback with 24 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 24 times speed or more CAV playback. Wide band RF amp. and AGC (fC = 20 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
AN8849SB
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
LDON
28
ENV detection
GCTRL FBAL CROSS CCRS TEN TEOUT
CEA
11
29 21
Comp.
NRFDET ARF CAGC RFC
17 10
RF AGC RFDET AC
23 24 25
9 8
BCA
BCA
Amp.
30
BCA BCA
TBAL
GCA
EQSW RFOUT RFN
6 5
GCA
EQ
7
GCA GCA
VCC2 VCC1 GND
4 18
ADD amp.
Amp.
36
35
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