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| ICs for CD/CD-ROM Player AN8807SB Three-Beam Method Head Amplifier IC for CD-ROM s Overview The AN8807SB is a head amplifier IC supporting the digital servo. Combination of this IC and the MN662710RA (digital servo processor + signal processing + DAC/DF) allows the rational CD ROM system to be constructed with small number of external parts. 0.30.11 1 36 Umit : mm automatic adjustment for tracking balance, tracking gain, tracking offset, focus balance, focus gain and focus offset 0.5 8.40.3 11.930.3 36-lead SSOP package (SSOP036-P-0450A) 1.30.25 2.850.2 * Detectors of DO, CROSS, OFTR and vibration built-in * Combination with the MN662710RA providing complete 0.10.1 fier, RF amplifier and APC built-in 0.2 + 0.1 - 0.05 s Features * Single supply operation * I-V amplifier, tracking error amplifier, focus error ampli- 0.8 18 19 1.30.25 15.20.3 AN8807SB CEA FBAL RF- FEOUT CACC ARF CENV 11 12 ENV 19 CSBDO - - AGC + - + 15 OFTR CSBRT 16 OFTR + VCBA - RF Det. BDO +- ENV Det. + + 13 14 BDO 10 17 RFDET 8 9 29 27 28 6 7 RFOUT FE- + + + s Block Diagram A A B D C A+C 36 - + D B+D VCBA - 35 - + 5 VCC PDFR 18 + 31 F - VCBA 21 LD OFF + + +- + + - - - - + + + - - 2 LD 4 TEOUT C.CRS 25 26 TE- 23 TEBPF 22 V Det. 1 FD 3 LD ON/OFF 20 VREF 32 - + PDER VCBA Subtracter 33 E - + 30 TBAL CROSS 24 ICs for CD-ROM Player 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 AN8807SB 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 vibration detection Input pin of vibration detection Output pin of TE CROSS detection signal Output pin of TE Amp. Inverting input pin of TE Amp. for connecting a resistance Output pin of FE Amp. Inverting 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 -20 ~ + 75 -55 ~ + 125 Unit V mA mW C C AN8807SB s Recommended Operating Range (Ta=25C) Parameter Operating Supply Voltage Range Symbol VCC ICs for 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) Symbol Itot VREF VCC=5V VCC=5V Condition min. 10.0 2.20 typ. 14.5 2.50 max. 19.0 2.80 Unit mA V VFO-OF VFO-OFB RFO DRFO BFO1-H BFO1-L BFO2-H BFO2-L GFO VCC=5V VCC=5V, VFB=VREF1V Applied VCC=5V, VFB=VREF VCC=5V, VFB=VREF VCC=5V, VFB=VREF +1V VCC=5V, VFB=VREF -1V VCC=5V, VFB=VREF +1V VCC=5V, VFB=VREF -1V VCC=5V, f=1kHz, 30kHz Input -300 -200 65 -12 0.15 1.19 1.19 0.15 -4.5 0 300 200 mV mV k % 93 0 0.25 1.70 1.70 0.25 -3 121 12 0.35 2.21 2.21 0.35 -1.5 dB VTR-OF VTR-OFB RTR DRTR BTR1-H BTR1-L BTR2-H BTR2-L GTR VCC=5V VCC=5V, VTB=VREF 1V Applied VCC=5V, VTB=VREF VCC=5V, VTB=VREF VCC=5V, VTB=VREF +1V VCC=5V, VTB=VREF -1V VCC=5V, VTB=VREF +1V VCC=5V, VTB=VREF -1V VCC=5V, f=10kHz, 100kHz -63 -200 420 -15 0.185 1.20 1.20 0.175 -3.8 0 63 200 mV mV k % 600 0 0.285 1.75 1.75 0.275 -2.3 780 15 0.385 2.30 2.30 0.375 - 0.8 dB VCR-H VCR-L VCC=5V, VTB=VREF f=10kHz VCC=5V, VTB=VREF f=10kHz VCC=5V VCC=5V VCC=5V VCC=5V, f=500kHz, 3MHz 4.2 0.8 V V VRF-OF RRF DRRF GRF -75 45.0 -10 -2.5 0 56.5 0 0 75 68.0 10 2.5 mV k % 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 (1) 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 6.5 6.5 -70 50 11 23 8.25 8.25 0 125 VDet. (1) VDet. (2) VDet.-H VDet.-L VCC=5V, V23 : DC Sweep VCC=5V, V23 : DC Sweep VCC=5V, V23 : DC Sweep VCC=5V, V23 : DC Sweep 52 -98 4.2 75 -75 VLDON-H VLDOFF-H VLD (1) VCC=5V VCC=5V VCC=5V, V1 : DC Sweep 3.5 3.5 0.135 0.170 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 IBDO VBDO-H VBDO-L VCC=5V VCC=5V, f=2kHz Rectangle Wave VCC=5V, f=2kHz Rectangle Wave 1.0 4.2 1.4 VNRF VNRF-H VNRF-L f=500kHz f=500kHz f=500kHz 0.065 4.2 0.1 GAGC GOP-AGC Gcm-AGC Gf-AGC VCC=5V, f=500kHz, Sine Wave f=500kHz, VIN=500mVP-P f=500kHz, VIN=100mVP-P f=3MHz, VIN=500mVP-P 10.0 4 3 -2 14.5 6 6 0 Symbol Condition min. typ. AN8807SB max. 19.0 9 9 2 0.135 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 9.5 9.5 70 200 V mV mV V V A dB k k mV mV AN8807SB ICs for 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 57.6k, when resistance between RF- and RFOUT is 12k. Light level 48k 12k 36 - + 48k 10k 10k 6 RRF Dark level 7 A D B C - + 35 - + RRF (T)= 48k 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 96k, when resistance between FE and FEOUT is 20k. 20k 48k VCBA 36 RFE A+ C - + 48k 28 27 A D B C - 20k - + + B+D 35 - + x2 fC =30kHz 29 VC - + Figure 2 : Focus Error Amplifier ICs for CD/CD-ROM Player AN8807SB The VCBA is for focus balance adjustment. Connecting 47k of external resistance toPin299, 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 E 33 - VCBA + Subtraction VREF 31 470k 26 - 25 + F 34 - VCBA 20k + 30 - + Figure 3 : Tracking Error Amplifier AN8807SB ICs for CD-ROM Player Pin31, 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. By Pin10 (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. 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. ICs for CD/CD-ROM Player AN8807SB * 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 the 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 * 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 10F + - 10 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 AN8807SB has a wind comparator of approx. 75 mV. Abnormal vibration components of tracking error are detected and the data for whether vibration is present or not is outputted to Pin22. AN8807SB * Envelope Detection ICs for CD-ROM Player The envelope detection circuit extracts fluctuation of RF signal required for adjustment of focus balance. Pin11 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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