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 1 0.3±0.1 (0.45) 0.8 11.6±0.3 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. 15 0.1±0.1 0.15 14 0.3 7.2±0.3 9.3±0.3 0.9 2.0±0.2 ■ 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. 28 SSOP028-P-0375 ■ Applications • CD player 1 2 PDF 2 F 8 E 9 PDE RF F-ch. VCBA E-ch. B-ch. Subtraction Band gap 17 1 RFIN VCBA RFDET 15 Subtraction BDO 10 A-ch. CSBRT 3TENV 11 B A OFTR OFTR detection CEA 5 4 BDO detection ENV PDB PDA RF detection 13 14 26 3 24 25 20 LDON GND VREF VCC FEOUT FEN ENVOFF AN8837SB ICs for Compact Disc/CD-ROM Player ■ Block Diagram 19 7 6 18 12 22 16 LD VDET LPD 21 TEBPF 23 TEOUT TEN CROSS 28 FBAL 27 TBAL ICs for Compact Disc/CD-ROM Player AN8837SB ■ Pin Descriptions Pin No. Description Pin No. Description 1 Tracking signal input pin 1 15 NRFDET output pin 2 Tracking signal input pin 2 16 CROSS output pin 3 Power supply pin 17 OFTR output pin 4 Focus signal input pin 1 18 VDET output pin 5 Focus signal input pin 2 19 3TENV output pin 6 APC amp. input pin 20 ENV control pin 7 APC amp. output pin 21 VDET input pin 8 RF adding output pin 22 TE amp. input pin 9 Input pin for the detection circuits 23 TE amp. output pin 10 Capacitor connection pin for OFTR 24 FE amp. outtput pin 11 Capacitor connection pin for HPF amp. 25 FE amp. intput pin 12 BDO output pin 26 VREF output pin 13 APC control pin 27 TBAL control pin 14 GND pin 28 FBAL control pin ■ Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage VCC 5.8 V Supply current ICC 20 mA PD 116 mW Topr −20 to +75 °C Tstg −55 to +125 °C Power dissipation Operating ambient temperature Storage temperature * * Note) *: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C. ■ Recommended Operating Range Parameter Supply voltage Symbol Range Unit VCC 2.7 to 5.5 V 3 AN8837SB ICs for Compact Disc/CD-ROM Player ■ Electrical Characteristics at Ta = 25°C Parameter Symbol Current consumption with no load ITOT VREF output pin VREF Conditions Min Typ Max Unit VCC = 3 V 3.8 5.8 7.8 mA VCC = 3 V 1.37 1.50 1.63 V Focus error amp. output offset voltage VFO-OF VCC = 3 V −100 0 100 mV Focus error offset balance crosstalk amount VFO-OFB VCC = 3 V VFB = VREF ±0.375V −120 0 120 mV Focus error amplification Focus error amp. V-V conversion gain GFO1 VCC = 3 V VFB = VREF 9.6 12.2 14.7 dB Focus error amp. V-V conversion relative gain ∆GFO2 VCC = 3 V VFB = VREF −1.5 0 1.5 dB Focus balance variable range 1−H BFO1-H VCC = 3 V VFB = VREF +0.375V 1.21 1.31 1.41 Focus balance variable range 1−L BFO1-L VCC = 3 V VFB = VREF − 0.375V 0.48 0.69 0.9 Focus balance variable range 2−H BFO2-H VCC = 3 V VFB = VREF +0.375V 0.48 0.69 0.9 Focus balance variable range 2−L BFO2-L VCC = 3 V VFB = VREF − 0.375V 1.21 1.31 1.41 Focus error amp. frequency characteristics GFOF VCC = 3 V f = 3 kHz, 50 kHz −4.7 −3.2 −1.7 dB Tracking error amplification Tracking error amp. output offset voltage VTR-OF VCC = 3 V −97 0 97 mV Tracking error offset balance crosstalk amount VTR-OFB VCC = 3 V VTB = VREF ±0.375V −120 0 120 mV RTR1 VCC = 3 V VTB = VREF 570 740 910 kΩ Tracking error amp. I−V conversion relative gain ∆RTR2 VCC = 3 V VTB = VREF −18 0 18 % Tracking balance variable range 1−H BTR1-H VCC = 3 V VTB = VREF +0.375V 0.47 0.68 0.89 Tracking balance variable range 1−L BTR1-L VCC = 3 V VTB = VREF − 0.375V 1.22 1.33 1.44 Tracking balance variable range 2−H BTR2-H VCC = 3 V VTB = VREF +0.375V 1.22 1.33 1.44 Tracking balance variable range 2−L BTR2-L VCC = 3 V VTB = VREF − 0.375V 0.47 0.68 0.89 Tracking error amp. frequency characteristics GTR1 VCC = 3 V f = 5 kHz, 100 kHz −5.0 −3.5 −2.0 dB TEMUTE operation V23M VCC = 3 V −75 0 75 mV Tracking error amp. I−V conversion gain 4 ICs for Compact Disc/CD-ROM Player AN8837SB ■ Electrical Characteristics at Ta = 25°C (continude) Parameter Symbol Conditions Min Typ Max Unit CROSS detection CROSS high-level output VCR-H VCC = 3 V, VTB = VREF , f = 10 kHz 2.6 V CROSS low-level output VCR-L VCC = 3 V, VTB = VREF , f = 10 kHz 0.4 V CROSS comparator hysteresis 1 ∆VHiS1 VCC = 3 V 35 50 65 mV CROSS comparator hysteresis 2 ∆VHiS2 VCC = 3 V −57 −42 −27 mV RF amplification RF amp. offset voltage VRF-OF VCC = 3 V −910 −710 −510 mV RF amp. transfer gain GRF VCC = 3 V 7.7 9.3 10.9 dB RF amp. relative transfer gain ∆GRF VCC = 3 V − 0.8 0 0.8 dB RF amp. frequency characteristics * GRFF VCC = 3 V f = 500 kHz, 3 MHz −3.7 −1.5 0.7 dB RF amp. relative frequency characteristics * ∆GRFF VCC = 3 V f = 500 kHz, 3 MHz −1.0 0 1.0 dB RF amp. EQ characteristics 1 * GEQ1 VCC = 3 V f = 500 kHz, 1.5 MHz 0.5 1.7 3.6 dB RF amp. EQ characteristics 2 * GEQ2 VCC = 3 V f = 100 kHz, 500 kHz −3.5 −2.0 − 0.5 dB VNRF VCC = 3 V, f = 500 kHz 88 132 176 mV[p-p] RFDET high-level VNRF-H VCC = 3 V, f = 500 kHz 2.6 V RFDET low-level VNRF-L VCC = 3 V, f = 500 kHz 0.4 V −70 −44 −18 mV RF detection RFDET detection operation BDO BDO detection level VBDO VCC = 3 V BDO high-level VBDO-H f = 5 kHz, 170 mV[p-p], VCC = 3 V 2.6 V BDO low-level VBDO-L f = 5 kHz, 170 mV[p-p], VCC = 3 V 0.4 V OFTR OFTR detection current GFAGC1 VCC = 3 V 1.03 1.45 1.87 µA OFTR high-level VOFT-H VCC = 3 V, f = 5 kHz, 700 mV[p-p] 2.6 V OFTR low-level VOFT-L VCC = 3 V, f = 5 kHz, 700 mV[p-p] 0.4 V VCC = 3 V 147 170 193 mV LD APC APC operating voltage VAPC 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 ■ Electrical Characteristics at Ta = 25°C (continued) Parameter Symbol Conditions Min Typ Max Unit VDET VDET detection level 1 VDET1 VCC = 3 V 38 51 64 mV VDET detection level 2 VDET2 VCC = 3 V −64 −51 −38 mV VDET high-level VDET-H VCC = 3 V 2.6 V VDET low-level VDET-L VCC = 3 V 0.4 V VCC = 3 V 140 200 260 kΩ VENV-OF VCC = 3 V −75 0 75 mV TEBPF input impedance ZTEB 3TENV ENV amp. offset voltage CEA-ENV transfer characteristics GCENV VCC = 3 V 6 7.6 9.2 times CEA input impedance ZCEA VCC = 3 V 6.8 8.7 10.6 kΩ ENV output impedance ZENV VCC = 3 V 6.2 8.0 9.8 kΩ 150 mV[p-p] ENV amp. operation VOP-ENV VCC = 3 V, f = 800 kHz AM modulation 70 110 ENV amp. no-operation VENV-OFF VCC = 3 V, f = 800 kHz AM modulation −15 0 15 mV[p-p] 29 Ω RF amplification RF-amp. output impedance 6 ZRFOS VCC = 3 V ICs for Compact Disc/CD-ROM Player AN8837SB VCC LDON GND 13 14 26 VREF FEOUT 3 VCC 24 20 19 7 CEA 11 VCC PD 6 OFTR detection CSBRT 10 LPD 18 VDET Band gap OFTR 17 21 TEBPF BDO 12 BDO detection 23 TEOUT Subtraction Subtraction 22 TEN RFDET 15 RF detection 16 CROSS FBAL TBAL F-ch. VCBA E-ch. 8 B-ch. A-ch. RFIN 9 VCBA 28 27 C B C F D A D F F PDF 2 PDE 1 E B 5 E PDB PDA 4 A RF E VCC LD LD 3TENV ENV ENV 25 FEN ENVOFF ■ Application Circuit Example 7