ICs for CD/CD-ROM Player AN8807SB Three-Beam Method Head Amplifier IC for CD-ROM ■ Overview 19 15.2±0.3 0.3±0.11 18 0.5 8.4±0.3 11.93±0.3 2.85±0.2 1.3±0.25 1.3±0.25 automatic adjustment for tracking balance, tracking gain, tracking offset, focus balance, focus gain and focus offset 36 0.2 +– 0.1 0.05 fier, RF amplifier and APC built-in • Detectors of DO, CROSS, OFTR and vibration built-in • Combination with the MN662710RA providing complete 1 0.8 ■ Features • Single supply operation • I–V amplifier, tracking error amplifier, focus error ampli- Umit : mm 0.1±0.1 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. 36-lead SSOP package (SSOP036-P-0450A) C D E 30 24 + 4 TEOUT FE– 25 + – 28 + + 23 TEBPF – 10 ARF AGC 9 + TE– 26 – CACC 8 22 1 RF Det. 17 RFDET V Det. + C.CRS – + – 27 FD LD ON/OFF 3 OFTR BDO – – ENV ENV Det. + 12 + 11 – CENV + CROSS Subtracter FEOUT CEA + TBAL + – – + – VCBA VCBA + – + 33 32 VCBA – – 29 + PDER F 31 + – VCBA – – RFOUT + PDFR 35 36 – 7 + B+D A+C 6 + + D B A A RF– FBAL 19 CSBDO CSBRT VCC 2 LD + 21 LD OFF 20 VREF 18 5 16 OFTR 15 14 BDO 13 AN8807SB ICs for CD-ROM Player ■ Block Diagram ICs for CD/CD-ROM Player AN8807SB ■ Pin Description Pin No. Pin Name I/O Function Description 1 PD I Signal input of PD for LD output monitor 2 LD O Connected to base of external Tr for LD drive 3 LDON I ON/OFF switching of LD APC 4 C. CRS 5 VCC 6 RF– I Reverse rotation input pin of RF Amp. for connecting a resistance 7 RFOUT O Output pin of RF Amp. (reverse rotation amp.) 8 RFIN I RF AGC input pin 9 C. AGC 10 ARF 11 C. ENV C-connecting pin for RF 12 C. EA C-connecting pin for amp. 13 C. SBDO 14 BDO 15 C. SBRT 16 OFTR O OFF TRACK detection output pin; positive logic 17 NRFDET O Output pin of RF signal amplitude detection; negative logic 18 GND 19 ENV O 20 VREF O VCC × 0.5 (V) output pin 21 LD OFF I Input pin for forced stop of LD APC 22 VDET O Output pin of vibration detection 23 TEBPF I Input pin of vibration detection 24 CROSS O Output pin of TE CROSS detection signal 25 TEOUT O Output pin of TE Amp. 26 TE– I Inverting input pin of TE Amp. for connecting a resistance 27 FEOUT O Output pin of FE Amp. 28 FE– I Inverting input pin of FE Amp. for connecting a resistance 29 FBAL I Control signal input pin for FO balance adjustment 30 TBAL I 31 PDFR 32 PDER 33 PDE I Connected to PIN Diode E 34 PDF I Connected to PIN Diode F 35 PDBD I Connected to B/D of astigmatic 4-division PD 36 PDAC I Connected to A/C of astigmatic 4-division PD Capacity connecting pin for CROSS Supply connecting pin C-connecting pin for RF AGC loop filter RF output pin after AGC O C-connecting pin for low speed detection of dark level DO BDO detection output pin; positive logic O C-connecting pin for OFTR low speed detection Ground pin ENV output pin 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 ■ Absolute Maximum Ratings (Ta=25˚C) Symbol Rating Supply Voltage Parameter VCC 6 Unit V Supply Current ICC 40 mA Power Dissipation PD 240 mW Operating Ambient Temperature Storage Temperature Topr –20 ~ + 75 ˚C Tstg –55 ~ + 125 ˚C ICs for CD-ROM Player AN8807SB ■ Recommended Operating Range (Ta=25˚C) Parameter Operating Supply Voltage Range Symbol Range VCC 3.4V ~ 5.5V ■ Electrical Characteristics (Ta=25˚C±2˚C) Parameter Symbol Condition min. typ. max. Unit Total Circuit Current Itot VCC=5V 10.0 14.5 19.0 mA VREF Output Voltage VREF VCC=5V 2.20 2.50 2.80 V VFO–OF VCC=5V –300 0 300 mV VFO–OFB VCC=5V, VFB=VREF±1V Applied –200 200 mV 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. RFO VCC=5V, VFB=VREF 65 93 121 kΩ DRFO VCC=5V, VFB=VREF –12 0 12 % Focus Balance Variable Range 1–H BFO1–H VCC=5V, VFB=VREF +1V 0.15 0.25 0.35 Focus Balance Variable Range 1–L BFO1–L VCC=5V, VFB=VREF –1V 1.19 1.70 2.21 Focus Balance Variable Range 2–H BFO2–H VCC=5V, VFB=VREF +1V 1.19 1.70 2.21 Focus Balance Variable Range 2–L BFO2–L VCC=5V, VFB=VREF –1V 0.15 0.25 0.35 VCC=5V, f=1kHz, 30kHz Input –4.5 –3 –1.5 dB VTR–OF VCC=5V –63 0 63 mV VTR–OFB VCC=5V, VTB=VREF ±1V Applied 200 mV 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. GFO –200 RTR VCC=5V, VTB=VREF 420 600 780 kΩ DRTR VCC=5V, VTB=VREF –15 0 15 % Tracking Balance Variable Range 1–H BTR1–H VCC=5V, VTB=VREF +1V 0.185 0.285 0.385 Tracking Balance Variable Range 1–L BTR1–L VCC=5V, VTB=VREF –1V 1.20 1.75 2.30 Tracking Balance Variable Range 2–H BTR2–H VCC=5V, VTB=VREF +1V 1.20 1.75 2.30 Tracking Balance Variable Range 2–L BTR2–L VCC=5V, VTB=VREF –1V 0.175 0.275 0.375 –3.8 –2.3 – 0.8 Frequency Characteristics of Tracking Error Amp. CROSS Detection GTR CROSS Output H Level VCR–H CROSS Output L Level VCR–L RF-Amp. RF-Amp. Offset Voltage VRF–OF VCC=5V –75 RRF VCC=5V 45.0 RF-Amp. I–V Conversion Relative Gain 1 DRRF VCC=5V –10 0 10 % RF-Amp. Frequency Characteristics 1 Note) GRF VCC=5V, f=500kHz, 3MHz –2.5 0 2.5 dB RF-Amp. I–V Conversion Gain VCC=5V, f=10kHz, 100kHz VCC=5V, VTB=VREF f=10kHz VCC=5V, VTB=VREF f=10kHz Note) The value may fluctuate by the influence of printed board, socket and etc. 4.2 dB V 0.8 V 0 75 mV 56.5 68.0 kΩ ICs for CD/CD-ROM Player AN8807SB ■ Electrical Characteristics (Cont.) (Ta=25˚C±2˚C) Parameter Symbol Condition min. typ. max. Unit AGC AGC Max. Gain GAGC VCC=5V, f=500kHz, Sine Wave 10.0 14.5 19.0 dB AGC Operation Gain GOP–AGC f=500kHz, VIN=500mVP–P 4 6 9 dB AGC Compressibility Gcm–AGC 3 6 9 dB AGC Frequency Characteristics Gf–AGC f=500kHz, VIN=100mVP–P f=3MHz, VIN=500mVP–P –2 0 2 dB 0.1 0.135 VP–P RFDET RFDET Detection Operation VNRF f=500kHz 0.065 RFDET H Level VNRF–H f=500kHz 4.2 RFDET L Level VNRF–L f=500kHz V 0.8 V 1.8 µA BDO BDO Detection Current VCC=5V 1.0 BDO H Level VBDO–H VCC=5V, f=2kHz Rectangle Wave 4.2 BDO L Level VBDO–L VCC=5V, f=2kHz Rectangle Wave IBDO 1.4 V 0.8 V 1.8 µA OFTR OFTR Detection Current VCC=5V 1.0 OFTR H Level VOFTR–H VCC=5V, f=2kHz Rectangle Wave 4.2 OFTR L Level VOFTR–L VCC=5V, f=2kHz Rectangle Wave LD ON H Input Level VLDON–H VCC=5V 3.5 V LD OFF H Input Level VLDOFF–H VCC=5V 3.5 V IOFTR 1.4 V 0.8 V LD – APC LD ON Operation Voltage (1) VLD (1) VCC=5V, V1 : DC Sweep V. Det. Level (1) VDet. (1) VCC=5V, V23 : DC Sweep 52 V. Det. Level (2) VDet. (2) VCC=5V, V23 : DC Sweep –98 V. Det. H Level VDet.–H 4.2 V. Det. L Level VDet.–L VCC=5V, V23 : DC Sweep VCC=5V, V23 : DC Sweep 0.135 0.170 0.205 V 75 98 mV –75 –52 mV 0.8 V V µA V. Detection 3TENV CENV Detection Current ICENV VCC=5V 8.5 11 13.5 GCEA–ENV VCC=5V 21 23 25 dB CEA Input Impedance RCEA VCC=5V 6.5 8.25 9.5 kΩ ENV Output Impedance RENV VCC=5V 6.5 8.25 9.5 kΩ ENV-Amp. Offset Voltage VOP–ENV VCC=5V –70 0 70 mV CEA-Amp. Operation Voltage VOP–CEA VCC=5V 50 125 200 mV CEA-ENV Transmission Characteristics ICs for CD-ROM Player AN8807SB ■ 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 57.6kΩ, when resistance between RF– and RFOUT is 12kΩ. Light level 48kΩ 36 12kΩ RRF – Dark level A B D C 10kΩ + 6 – 48kΩ 10kΩ 35 7 + – + RRF (T)= 48kΩ × RRF 10kΩ 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 96kΩ, when resistance between FE and FEOUT is 20kΩ. 20kΩ 48kΩ RFE VCBA 36 A B D C A+ C – + 28 – + B+D – + ×2 fC =30kHz 29 – 20kΩ 48kΩ 35 27 – VC + Figure 2 : Focus Error Amplifier + ICs for CD/CD-ROM Player AN8807SB The VCBA is for focus balance adjustment. Connecting 47kΩ of external resistance toPin299, signal ratio between A+C and B+D can be controlled as shown in Table 1. Table 1 VC A+C B+D B+D A+C 1.5V 0.14 7.0 2.5V 1.0 1.0 3.5V 7.0 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). 32 VREF 470kΩ E fC6100kHz – 33 VCBA + Subtraction – 25 470kΩ F 26 31 VREF + 20kΩ – 34 VCBA + 30 – + Figure 3 : Tracking Error Amplifier ICs for CD-ROM Player AN8807SB Pin31, and 32 are used to make the resistance converting the current to voltage variable. When these pins are directly connected to VREF and 20kΩ of resistance is connected between TE and TE–, and between TE and TEOUT respectively, equivalent resistance to TEOUT is 629kΩ. Table 2 VC E/F F/E 1.5V 0.14 7.0 2.5V 1.0 1.0 3.5V 7.0 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. 27.9kΩ. 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 1µF around should be connected to it for VCC. RF VCC 1µF 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 10µF + 10Ω – 2 LD 170mV 1 3 PD 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 1µF to 10µF 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. ICs for CD-ROM Player AN8807SB • Envelope Detection 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 0.027µF 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 0.027µF around should be connected to it for VREF. CENV CEA 11 AGC ENV 12 19 ENV Detection Figure 6 : Envelope Detection • CROSS Detection + – 24 CROSS 4 25 C.CRS TEOUT Figure 7 : CROSS Detection 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 2.2µF around should be connected to it for VREF.