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ICs for Compact Disc/CD-ROM Player
AN8839NSB
CD-DA head amplifier IC for 3-beam system optical pick-up
s Overview
The AN8839NSB 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.
1
(0.45)
Unit: mm
28
0.3±0.1
s Features
• Operating supply voltage VCC = 2.4 V to 5.5 V • Balance adjustment function built-in Focus error amp./tracking error amp. • OFTR/BDO detection • Standby function built in • APC amp.
14
0.1±0.1
15
0.15
0.3 7.2±0.3 9.3±0.3
s Applications
• CD player
SSOP028-P-0375
0.9 2.0±0.2
0.8
11.6±0.3
1
2
RFDET CSBRT OFTR ENV CEA BDO RFIN 9 RF 8 15 12 10 17 11 19
RF detection BDO detection 3TENV 20 25
A
AN8839NSB
s Block Diagram
OFTR detection
N.C. FEN 24 3 26 FEOUT VCC VREF
PDA A-ch. Subtraction VCBA
B
4
PDB B-ch. Band gap
E
5
PDE E-ch. VCBA F-ch.
F
1 Subtraction
14 13
GND LDON
PDF
2
6
7
22
23
21
16
18
27 FBAL TBAL
ICs for Compact Disc/CD-ROM Player
28
LD
LPD
TEN
N.C.
N.C.
TEOUT
PDOWN
ICs for Compact Disc/CD-ROM Player
s Pin Descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Description Tracking signal input pin 1 Tracking signal input pin 2 Power supply pin Focus signal input pin 1 Focus signal input pin 2 APC amp. input pin APC amp. output pin RF adding output pin Input pin for the detection circuits Capacitor connection pin for OFTR Capacitor connection pin for HPF amp. BDO output pin APC control pin GND pin Pin No. 15 16 17 18 19 20 21 22 23 24 25 26 27 28
AN8839NSB
Description NRFDET output pin Power-down input pin OFTR output pin N.C. 3TENV output pin N.C N.C TE amp. input pin TE amp. output pin FE amp. output pin FE amp. input pin VREF output pin TBAL control pin FBAL control pin
s Absolute Maximum Ratings
Parameter Supply voltage Supply current Power dissipation Operating ambient temperature Storage temperature
* *
Symbol VCC ICC PD Topr Tstg
Rating 5.8 20 116 −20 to +75 −55 to +125
Unit V mA mW °C °C
Note) *: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.
s Recommended Operating Range
Parameter Supply voltage Symbol VCC Range 2.4 to 5.5 Unit V
3
AN8839NSB
s Electrical Characteristics at Ta = 25°C
Parameter Current consumption with no load No load current at power down VREF output pin Focus error amplification Focus error amp. output offset voltage Focus error offset balance crosstalk amount Focus error amp. V-V conversion gain Focus error amp. V-V conversion relative gain Focus balance variable range 1−H Focus balance variable range 1−L Focus balance variable range 2−H Focus balance variable range 2−L Tracking error amplification Tracking error amp. output offset voltage Tracking error offset balance crosstalk amount Tracking error amp. I−V conversion gain Tracking error amp. I−V conversion relative gain Tracking balance variable .
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