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| ICs for CD/CD-ROM Player AN8808SB Three-Beam Method Head Amplifier IC for CD (supporting the hologram pick-up) s Overview The AN8808SB is a head amplifier IC supporting the digital servo (supporting the voltage output hologram pick). Combination of this IC and the MN6627XX series allows the rational CD system to be constructed with small number of external parts. 0.30.11 1 36 Umit : mm s Features * Single supply operation * I-V amplifier, tracking error amplifier, focus error amplifier, RF amplifier and APC built-in * Detectors of DO, CROSS, OFTR and vibration built-in * Combination with the MN6627XX series providing complete automatic adjustment for tracking balance, tracking gain, tracking offset, focus balance, focus gain and focus offset 0.8 18 19 0.2 + 0.1 - 0.05 1.30.25 2.850.2 0.10.1 0.5 8.40.3 11.930.3 s Application CD player 36-lead SSOP package (SSOP036-P-0450A) 1.30.25 15.20.3 AN8808SB RFIN CEA FBAL CACC FEOUT ARF CENV 11 12 ENV 19 CSBDO - - AGC VCBA 15 OFTR CSBRT 16 OFTR VCBA Subtraction 5 VCC RF Det. BDO - ENV Det. + + + 13 14 BDO 8 9 10 17 RFDET 29 27 28 FE- + + + RF- 6 7 RFOUT s Block Diagram F A B D C A+C 36 - + E B+D 35 - + PDFR 18 + 31 34 VCBA - - 20 VREF + F Subtraction VCBA PDFR 32 21 LD OFF + + - - + 2 LD E + + - - 33 - ICs for CD/CD-ROM Player + 30 4 TBAL CROSS C.CRS 24 25 TEOUT 26 TE- 23 TEBPF 22 V Det. 1 PD 3 LD ON/OFF ICs for CD/CD-ROM Player s Pin Description Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 PD LD LDON C. CRS VCC RF- RFOUT RFIN C. AGC ARF C. ENV C. EA C. SBDO BDO C. SBRT OFTR NRFDET GND ENV VREF LD OFF VDET TEBPF CROSS TEOUT TE- FEOUT FE- FBAL TBAL PDFR PDER PDE PDF PDBD PDAC I I I I O O I O I O O I O I I I O O O O I O I Pin Name I/O I O I Function Description Signal input of PD for LD output monitor Connected to base of external Tr for LD drive ON/OFF switching of LD APC Capacity connecting pin for CROSS Supply connecting pin AN8808SB Reverse rotation input pin of RF Amp. for connecting a resistance Output pin of RF Amp. (reverse rotation amp.) RF AGC input pin C-connecting pin for RF AGC loop filter RF output pin after AGC C-connecting pin for RF C-connecting pin for amp. C-connecting pin for low speed detection of dark level DO BDO detection output pin; positive logic C-connecting pin for OFTR low speed detection OFF TRACK detection output pin; positive logic Output pin of RF signal amplitude detection ; negative logic Ground pin ENV output pin VCC x 0.5 (V) output pin Input pin for forced stop of LD APC Output pin of amplitude detection Input pin of amplitude detection Output pin of TE CROSS detection signal Output pin of TE Amp. Reverse rotation input pin of TE Amp. for connecting a resistance Output pin of FE Amp. Reverse rotation input pin of FE Amp. for connecting a resistance Control signal input pin for FO balance adjustment Control signal input pin for TE balance adjustment Resistance-connected pin setting the I -V conversion resistance value of PDE Resistance-connected pin setting the I -V conversion resistance value of PDF Connected to PIN Diode E Connected to PIN Diode F Connected to B/D of astigmatic 4-division PD Connected to A/C of astigmatic 4-division PD s Absolute Maximum Ratings (Ta=25C) Parameter Supply Voltage Supply Current Power Dissipation Operating Ambient Temperature Storage Temperature Symbol VCC ICC PD Topr Tstg Rating 6 40 240 -30 ~ + 85 -55 ~ + 125 Unit V mA mW C C AN8808SB s Recommended Operating Range (Ta=25C) Parameter Operating Supply Voltage Range Symbol VCC ICs for CD/CD-ROM Player Range 3.4V ~ 5.5V s Electrical Characteristics (Ta=25C2C) Parameter Total Circuit Current VREF Output Voltage Focus Error Amp. Output Offset Voltage of Focus Error Amp. Crosstalk Quantity of Focus Error Offset Balance I-V Conversion Gain of Focus Error Amp. I-V Conversion Relative Gain of Focus Error Amp. Focus Balance Variable Range 1 - H Focus Balance Variable Range 1 - L Focus Balance Variable Range 2 - H Focus Balance Variable Range 2 - L Frequency Characteristics of Focus Error Amp. Tracking Error Amp. Output Offset Voltage of Tracking Error Amp. Crosstalk Quantity of Tracking Error Offset Balance I-V Conversion Gain of Tracking Error Amp. I-V Conversion Relative Gain of Tracking Error Amp. Tracking Balance Variable Range 1 - H Tracking Balance Variable Range 1 - L Tracking Balance Variable Range 2 - H Tracking Balance Variable Range 2 - L Frequency Characteristics of Tracking Error Amp. CROSS Detection CROSS Output H Level CROSS Output L Level RF-Amp. RF-Amp. Offset Voltage RF-Amp. I -V Conversion Gain RF-Amp. I -V Conversion Relative Gain 1 RF-Amp. Frequency Characteristics 1 Note) VRE - OF RRF DRRF GRF VCC =5V VCC =5V VCC =5V VCC =5V, f=500kHz, 3MHz -75 58 -15 -1.6 0 83 0 1.5 75 108 15 3.8 mV k % dB VCR - H VCR - L VCC=5V, VTB=VREF, f=10kHz VCC=5V, VTB=VREF, f=10kHz 4.2 0.8 V V VTR - OF VTR - OFB RTR DRTR BTR1- H BTR1 - L BTR2 - H BTR2 - L GTR VCC=5V VCC=5V VTB=VREF0.9V Applied VCC=5V, VTB=VREF VCC=5V, VTB=VREF VCC=5V, VTB=VREF +0.9V VCC=5V, VTB=VREF - 0.9V VCC=5V, VTB=VREF +0.9V VCC=5V, VTB=VREF - 0.9V VCC=5V, f=10kHz, 100kHz -150 -180 1099 -15 0.25 1.19 1.19 0.24 -3.5 1570 0 0.38 1.70 1.70 0.37 -2 0 150 180 2041 15 0.51 2.21 2.21 0.50 - 0.5 dB mV mV k % Symbol Itot VREF VCC=5V VCC=5V Condition min. 8.8 2.20 typ. 12.6 2.50 max. 16.4 2.80 Unit mA V VFO - OF VFO - OF8 RFO DRFO BF01- H BF01 - L BF02 - H BF02 - L GFO VCC=5V VCC=5V VFB=VREF0.9V Applied VCC=5V, VFB=VREF VCC=5V, VFB=VREF VCC=5V, VFB=VREF +0.9V VCC=5V, VFB=VREF - 0.9V VCC=5V, VFB=VREF +0.9V VCC=5V, VFB=VREF - 0.9V VCC=5V, f=1kHz, 30kHz Input -350 -300 539 -15 0.20 1.23 1.23 0.20 -4.5 0 350 300 mV mV k % 770 0 0.31 1.75 1.75 0.31 -3 1001 15 0.42 2.21 2.21 0.42 1.5 dB Note) The value may fluctuate by the influence of printed board, socket and etc. ICs for CD/CD-ROM Player s Electrical Characteristics (Cont.) (Ta=25C2C) Parameter AGC AGC Max. Gain AGC Operation Gain AGC Compressibility AGC Frequency Characteristics RFDET RFDET Detection Operation RFDET H Level RFDET L Level BDO BDO Detection Current BDO H Level BDO L Level OFTR OFTR Detection Current OFTR H Level OFTR L Level LD - APC LD ON H Input Level LD OFF H Input Level LD ON Operation Voltage V. Detection V. Det. Level (1) V. Det. Level (2) V. Det. H Level V. Det. L Level 3TENV CENV Detection Current CEA- ENV Transmission Characteristics CEA Input Impedance ENV Output Impedance ENV-Amp. Offset Voltage CEA-Amp. Operation Voltage ICENV GCEA - ENV RCEA RENV VOP - ENV VOP - CEA VCC=5V VCC=5V VCC=5V VCC=5V VCC=5V VCC=5V 8.5 21 6.6 6.2 -85 55.0 11 23 8.3 7.8 0 137.5 VLDON - H VLDOFF - H VLD VDet. (1) VDet. (2) VDet. - H VDet. - L VCC=5V VCC=5V VCC=5V, V1 : DC Sweep VCC=5V, V23 : DC Sweep VCC=5V, V23 : DC Sweep VCC=5V, V23 : DC Sweep VCC=5V, V23 : DC Sweep 3.5 3.5 0.135 52 -98 4.2 0.170 75 -75 IOFTR VOFTR - H VOFTR - L VCC=5V VCC=5V, f=2kHz Rectangle Wave VCC=5V, f=2kHz Rectangle Wave 1.0 4.2 1.4 GAGC GOP - AGC Gcm - AGC Gf - AGC VNRF VNRF - H VNRF - L IBDO VBDO - H VBDO - L VCC=5V, f=500kHz, Sine Wave f=500kHz, VIN=500mVP-P f=500kHz, VIN=100mVP-P f=3MHz, VIN=500mVP-P f=500kHz f=500kHz f=500kHz VCC=5V VCC=5V, f=2kHz Rectangle Wave VCC=5V, f=2kHz Rectangle Wave 1.0 4.2 1.4 10.0 4 3 -2 0.085 4.2 14.5 6 6 0 0.125 Symbol Condition min. typ. AN8808SB max. 19.0 9 9 2 0.165 0.8 1.8 0.8 1.8 0.8 Unit dB dB dB dB VP-P V V A V V A V V V V 0.205 98 -52 0.8 13.5 25 10 9.4 85 220.0 V mV mV V V A dB k k mV mV AN8808SB ICs for CD/CD-ROM Player s Operational Description (The values shown below are design values when supply voltageVCC=5V.) * RF Amplifier As shown in Figure 1, RF signals are generated by three-beam method pick-up. Equivalent resistance to RFOUT (Pin7) is 127k, when resistance between RF- and RFOUT is 12k. Light level 106k 12k 36 - + 106k 10k 10k 6 RRF Dark level 7 A D B C - + 35 - + RRF(T)=106k x RRF 10k Figure 1 : RF Amplifier * Focus Error Amplifier As shown in Figure 2, the operation result of (A + C) - (B + D) is outputted to FEOUT (Pin27). Equivalent resistance to FEOUT is 212k, when resistance between FE and FEOUT is 20k. 20k 106k RFE VCBA 36 - + 106k A+C 28 27 A D B C Subtraction B+D - + 35 - + 29 VC - + Figure 2 : Focus Error Amplifier ICs for CD/CD-ROM Player AN8808SB The VCBA is for focus balance adjustment. Connecting 47k of an external resistance to Pin29, signal ratio between A + C and B + D can be controlled as shown in Table 1. Table 1 VC 1.5V 2.5V 3.5V A+C B+D 0.14 1.0 7.0 B+D A+C 7.0 1.0 0.14 * Tracking Error Amplifier As shown in Figure 3, the tracking error amplifier receives the output currents E and F of three-beam method pin photo diode for sub-beam detection, and outputs the operation result of E-F to TEOUT (Pin25). VREF 32 470k fC6100kHz 20k E 33 - VCBA + Subtraction VREF 31 470k 26 - 25 + F 34 - VCBA 20k + 30 - + Figure 3 : Tracking Error Amplifier AN8808SB ICs for CD/CD-ROM Player Pins31 and 32 are used to make the resistance converting the current to voltage variable. When these pins are directly connected to VREF and 20k of resistance is connected between TE and TE-, and between TE and TEOUT respectively, equivalent resistance to TEOUT is 629k. Table 2 VC 1.5V 2.5V 3.5V E/F 0.14 1.0 7.0 F/E 7.0 1.0 0.14 The VCBA is for tracking balance adjustment in the same way of for focus. Table 2 shows the tracking balance ratio under the same conditions as shown in Table 1. * AGC In order to absorb the attenuation of RF signal by disk, pick-up dispersion, finger print and other factors, AGC circuit for RF is incorporated. The input impedance of Pin8 is approx. 27.9k. ByPin10 (ARF), the gain-controlled RF-signal is outputted. Input allowable level is approx. 1VP-P ~ 500mVP-P ~ 250mVP-P, and output is 1VP-P. Pin9 is a connecting pin with capacity for constructing the AGC loop filter, and it is recommended that the external capacitor of 1F around should be connected to it for VCC. RF VCC 1F ARF 8 9 10 AGC Figure 4 : AGC * RFDET The RFDET detects amplitude of RF signal inputted to Pin8. Threshold value is approx. 100mV (f= 500kHz), and RF Present = L, RF Absent = H are outputted. * BDO Detection BDO is detected by the low speed detection circuit and high speed detection circuit. The high speed detection circuit is incorporated. On the other hand, the capacitor of the low speed detection circuit must be connected to Pin13. The capacity value is 2200pF and it is recommended that it should be connected for VCC. When this capacity value of Pin13 is increased, BDO is detected with large RF missing rate. When it is decreased, BDO can be detected with small RF missing rate. BDO present = H BDO absent = L ICs for CD/CD-ROM Player AN8808SB * OFTR Detection OFTR detection reversely corresponds with BDO detection. However, its detection method is the same as for BDO. Capacitor for the low speed detection must be connected to Pin15. It is recommended that it should be connected to VCC at 2200pF in the same way as for Pin13. The relation between the capacity value and OFTR detection timing is as the same for BDO. OFTR=H Off from OFTR=L * APC 21 LD OFF VCC + - 2 LD 170mV 1 PD 3 LD ON/OFF Figure 5 : APC The reference voltage of LD is approx. 170mV fixed. * Reference Supply Servo reference supply is incorporated. Pin20 outputs VCC/2, and has approx. 3mA of current capacity for sink/source. It is recommended that it should be given 1F to 10F of capacity in addition. * Vibration Detection The AN8808SB has a wind comparator of approx. 75mV. Abnormal vibration components of tracking error are detected and the data for whether vibration is present or not is outputted to Pin22. AN8808SB * Envelope Detection ICs for CD/CD-ROM Player The envelope detection circuit extracts fluctuation of RF signal required for adjustment of focus balance. Pins11 and 12 are connecting pins with capacity for constructing the filter. It is recommended that for Pin11, a capacitor of 100pF around, and for Pin12, an external capacitor of 0.027F around should be connected against VCC. Pin19 is for output and must have external capacity for constructing the filter, and it is recommended that an external capacitor of 0.027F around should be connected to it for VREF CENV 11 CEA 12 ENV 19 AGC ENV Detection Figure 6 : Envelope Detection * CROSS Detection 24 CROSS Track cross signals are detected from tracking error output. Pin4 is a connecting pin for constructing the filter, and it is recommended that a capacitor of 2.2F around should be connected to it for VREF. + - 4 C.CRS 25 TEOUT Figure 7 : CROSS Detection |
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