![](/html/28/284b/284b0bd1a3f9bd970247149f7b8f58fd1acf8a279e0a2650337b7f9d61b5225b/bg1.png)
ICs for Compact Disc/CD-ROM Player
AN8837SB
Low power consumption CD-DA head amplifier IC for 3-beam system
optical pick-up
Unit: mm
■ Overview
The AN8837SB is a head amplifier IC for digital
servo. It can configure an efficient CD system in combination with the MN6627XX series, and allows a fullautomatic adjustment of tracking balance-gain-offset and
focus balance-gain-offset with fewer external parts.
■ Features
• Operating supply voltage VCC = 2.7 V to 5.5 V
• Balance adjustment function built-in
Focus error amp./tracking error amp.
• OFTR/BDO detection
• CROSS detection and vibration detection
• APC amp.
■ Applications
• CD player
1
(0.45)
14 15
0.1±0.1
0.3
7.2±0.3
9.3±0.3
SSOP028-P-0375
28
0.3±0.1
11.6±0.3
0.8
0.15
0.9
2.0±0.2
1
![](/html/28/284b/284b0bd1a3f9bd970247149f7b8f58fd1acf8a279e0a2650337b7f9d61b5225b/bg2.png)
AN8837SB ICs for Compact Disc/CD-ROM Player
■ Block Diagram
REF
CC
FEOUT
ENV
CEA
OFTR
CSBRT
BDO
19
11
17
10
12
ENVOFF
20
3TENV
OFTR
detection
FEN
25
24
V
V
3
26
14
Band
GND
gap
LDON
13
7
6
18
21
23
LD
LPD
VDET
TEBPF
TEOUT
RFDET
RFIN
RF
15
9
8
RF
detection
BDO
detection
4
Sub-
A-ch.
A
PDA
traction
VCBA
5
B-ch.
B
PDB
1
E
PDE
Sub-
E-ch.
traction
F-ch.
VCBA
F
2
PDF
22
16
28
27
TEN
CROSS
FBAL
TBAL
2
![](/html/28/284b/284b0bd1a3f9bd970247149f7b8f58fd1acf8a279e0a2650337b7f9d61b5225b/bg3.png)
ICs for Compact Disc/CD-ROM Player AN8837SB
■ Pin Descriptions
Pin No. Description
1 Tracking signal input pin 1
2 Tracking signal input pin 2
3 Power supply pin
4 Focus signal input pin 1
5 Focus signal input pin 2
6 APC amp. input pin
7 APC amp. output pin
8 RF adding output pin
9 Input pin for the detection circuits
10 Capacitor connection pin for OFTR
11 Capacitor connection pin for HPF amp.
12 BDO output pin
13 APC control pin
14 GND pin
Pin No. Description
15 NRFDET output pin
16 CROSS output pin
17 OFTR output pin
18 VDET output pin
19 3TENV output pin
20 ENV control pin
21 VDET input pin
22 TE amp. input pin
23 TE amp. output pin
24 FE amp. outtput pin
25 FE amp. intput pin
26 V
output pin
REF
27 TBAL control pin
28 FBAL control pin
■ Absolute Maximum Ratings
Parameter Symbol Rating Unit
Supply voltage V
Supply current I
Power dissipation P
Operating ambient temperature
Storage temperature
Note)*: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.
*
*
CC
CC
D
T
opr
T
stg
5.8 V
20 mA
116 mW
−20 to +75 °C
−55 to +125 °C
■ Recommended Operating Range
Parameter Symbol Range Unit
Supply voltage V
CC
2.7 to 5.5 V
3