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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
s 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.
(0.45)
1
28
0.30.1
s 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.
0.10.1
14
15
0.15
0.3 7.20.3 9.30.3
SSOP028-P-0375
s Applications
* CD player
0.9 2.00.2
0.8
11.60.3
1
2
AN8837SB
RFDET
CSBRT
ENV
s Block Diagram
OFTR
RFIN BDO CEA 9
RF detection BDO detection 3TENV OFTR detection 20 ENVOFF 25 FEN 24 3 FEOUT VCC 26 Band gap 14 13 VREF GND LDON
RF 8 15 12 10 17 11 19
PDA
A
4 A-ch. Subtraction VCBA
B
PDB B-ch.
5
PDE
E
1 E-ch. VCBA
F
PDF F-ch.
2
Subtraction
6
7
16 CROSS
22 TEN
21
18
LD
LPD
ICs for Compact Disc/CD-ROM Player
TEBPF 23 TEOUT
28 FBAL 27 TBAL
VDET
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 Description NRFDET output pin CROSS output pin OFTR output pin VDET output pin 3TENV output pin ENV control pin VDET input pin TE amp. input pin TE amp. output pin FE amp. outtput pin FE amp. intput pin VREF output pin TBAL control pin FBAL control pin
AN8837SB
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 = 25C.
s Recommended Operating Range
Parameter Supply voltage Symbol VCC Range 2.7 to 5.5 Unit V
3
AN8837SB
s Electrical Characteristics at Ta = 25C
Parameter Current consumption with no load 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 Focus error amp. frequency characteristics 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 range 1-H Tracking balance variable range 1-L Tracking balance variable range 2-H Tracking balance variable range 2-L Tracking error amp. frequency characteristics TEMUTE operation VTR-OF VCC = 3 V VFO-OF VCC = 3 V Symbol ITOT VREF VCC = 3 V VCC = 3 V
ICs for Compact Disc/CD-ROM Player
Conditions
Min 3.8 1.37 -100 -120 9.6 -1.5 1.21 0.48 0.48 1.21 -4.7
Typ 5.8 1.50
Max 7.8 1.63
Unit mA V
0 0 12.2 0 1.31 0.69 0.69 1.31 -3.2
100 120 14.7 1.5 1.41 0.9 0.9 1.41 -1.7
mV mV dB dB dB
VFO-OFB VCC = 3 V VFB = VREF 0.375V GFO1 GFO2 BFO1-H BFO1-L BFO2-H BFO2-L GFOF VCC = 3 V VFB = VREF VCC = 3 V VFB = VREF VCC = 3 V VFB = VREF +0.375V VCC = 3 V VFB = VREF - 0.375V VCC = 3 V VFB = VREF +0.375V VCC = 3 V VFB = VREF - 0.375V VCC = 3 V f = 3 kHz, 50 kHz
-97 -120 570 -18 0.47 1.22 1.22 0.47 -5.0 -75
0 0 740 0 0.68 1.33 1.33 0.68 -3.5 0
97 120 910 18 0.89 1.44 1.44 0.89 -2.0 75
mV mV k % dB mV
VTR-OFB VCC = 3 V VTB = VREF 0.375V RTR1 RTR2 BTR1-H BTR1-L BTR2-H BTR2-L GTR1 V23M VCC = 3 V VTB = VREF VCC = 3 V VTB = VREF VCC = 3 V VTB = VREF +0.375V VCC = 3 V VTB = VREF - 0.375V VCC = 3 V VTB = VREF +0.375V VCC = 3 V VTB = VREF - 0.375V VCC = 3 V f = 5 kHz, 100 kHz VCC = 3 V
4
ICs for Compact Disc/CD-ROM Player
s Electrical Characteristics at Ta = 25C (continude)
Parameter CROSS detection CROSS high-level output CROSS low-level output CROSS comparator hysteresis 1 CROSS comparator hysteresis 2 RF amplification RF amp. offset voltage RF amp. transfer gain RF amp. relative transfer gain RF amp. frequency characteristics * RF amp. relative frequency characteristics * RF amp. EQ characteristics 1 * RF amp. EQ characteristics 2 * RF detection RFDET detection operation RFDET high-level RFDET low-level BDO BDO detection level BDO high-level BDO low-level OFTR OFTR detection current OFTR high-level OFTR low-level LD APC APC operating voltage VAPC VCC = 3 V 147 170 GFAGC1 VCC = 3 V VOFT-H VCC = 3 V, f = 5 kHz, 700 mV[p-p] VOFT-L VCC = 3 V, f = 5 kHz, 700 mV[p-p] 1.03 2.6 1.45 VBDO VCC = 3 V -70 2.6 -44 VNRF VCC = 3 V, f = 500 kHz 88 2.6 132 VRF-OF GRF GRF GRFF GRFF GEQ1 GEQ2 VCC = 3 V VCC = 3 V VCC = 3 V VCC = 3 V f = 500 kHz, 3 MHz VCC = 3 V f = 500 kHz, 3 MHz VCC = 3 V f = 500 kHz, 1.5 MHz VCC = 3 V f = 100 kHz, 500 kHz -910 7.7 - 0.8 -3.7 -1.0 0.5 -3.5 -710 9.3 0 -1.5 0 1.7 -2.0 VCR-H VCR-L VCC = 3 V, VTB = VREF , f = 10 kHz VCC = 3 V, VTB = VREF , f = 10 kHz 2.6 35 -57 50 -42 Symbol Conditions Min Typ
AN8837SB
Max 0.4 65 -27
Unit
V V mV mV
VHiS1 VCC = 3 V VHiS2 VCC = 3 V
-510 10.9 0.8 0.7 1.0 3.6 - 0.5
mV dB dB dB dB dB dB
176 mV[p-p] 0.4 -18 0.4 V V
VNRF-H VCC = 3 V, f = 500 kHz VNRF-L VCC = 3 V, f = 500 kHz
mV V V A V V
VBDO-H f = 5 kHz, 170 mV[p-p], VCC = 3 V VBDO-L f = 5 kHz, 170 mV[p-p], VCC = 3 V
1.87 0.4
193
mV
Note) *: The values mentioned above are subject to change according to the state of a printed circuit board, a socket, etc.
5
AN8837SB
ICs for Compact Disc/CD-ROM Player
s Electrical Characteristics at Ta = 25C (continued)
Parameter VDET VDET detection level 1 VDET detection level 2 VDET high-level VDET low-level TEBPF input impedance 3TENV ENV amp. offset voltage CEA-ENV transfer characteristics CEA input impedance ENV output impedance ENV amp. operation ENV amp. no-operation RF amplification RF-amp. output impedance ZRFOS VCC = 3 V 29 VENV-OF VCC = 3 V GCENV ZCEA ZENV VCC = 3 V VCC = 3 V VCC = 3 V -75 6 6.8 6.2 70 -15 0 7.6 8.7 8.0 110 0 75 9.2 10.6 9.8 mV times k k VDET1 VDET2 VCC = 3 V VCC = 3 V 38 -64 2.6 140 51 -51 200 64 -38 0.4 260 mV mV V V k Symbol Conditions Min Typ Max Unit
VDET-H VCC = 3 V VDET-L VCC = 3 V ZTEB VCC = 3 V
VOP-ENV VCC = 3 V, f = 800 kHz AM modulation VENV-OFF VCC = 3 V, f = 800 kHz AM modulation
150 mV[p-p] 15 mV[p-p]
6
ICs for Compact Disc/CD-ROM Player
s Application Circuit Example
AN8837SB
ENVOFF
FEOUT 3 VCC
26 VREF
25 FEN
20
24
14
ENV
ENV
19
13
LDON
GND
7
LD
LD VCC PD
VCC
CEA 11
3TENV
6
LPD
VCC
CSBRT 10 BDO 12
OFTR detection
Band gap
OFTR 17
18 VDET
21 TEBPF
BDO detection
23 TEOUT 22 TEN
Subtraction
Subtraction
RFDET 15
RF detection
16 CROSS 28 27
FBAL TBAL
VCBA
VCBA
A-ch.
B-ch.
E-ch.
E
8 RF
A
B
1
4
PDA
5
PDB
PDE
2 PDF
C B C
E
D A D
E
F
F
F
F-ch.
RFIN 9
7

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