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Three-Beam Method Head Amplifier IC for CD Player
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ICs for CD/CD-ROM Player
AN8806SB
Three-Beam Method Head Amplifier IC for CD Player
s Overview
The AN8806SB is a head amplifier IC supporting the digital servo. Combination of this IC and the MN6627XX series allows the rational CD system to be constructed with small number of external parts.
0.3±0.11 1 36 Umit : mm
s Features · Single supply operation · IV 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
0.1 0.2 + 0.05
0.1±0.1
1.3±0.25 2.85±0.2
0.5
8.4±0.3 11.93±0.3
36-lead SSOP package (SSOP036-P-0450A)
1.3±0.25
15.2±0.2
AN8806SB
RFIN CEA RF FEOUT FE ARF CENV 11 12 ENV 19 CSBDO + + + EQ + VCBA + OFTR AGC RF Det. BDO ENV Det. 13 14 BDO 8 9 10 17 RFDET 27 28 29 6 7 RFOUT FBAL CACC + + +
s Block Diagram
F
A
B
D
C
A+C
36
+
15 CSBRT 16 OFTR
E IA+C IB+D FBAL : FEOUT : FEOUT + : FEOUT +
B+D + VCBA
35
+
5
VCC
PDFR IF IE TBAL VCBA : TEOUT : TEOUT + : TEOUT +
31
18
34
F Subtraction +
+
+
20 VREF
PDER VCBA + +
32
21 LD OFF + + 2 LD 25 TEOUT 26 TE 23 TEBPF 22 V Det. 1 PD 4 LDP 3 LD ON/OFF +
E
33
+
30 TBAL CROSS
ICs for CD/CD-ROM Player
24
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 LDP 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 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 Switching of APC reference voltage Supply connecting pin
AN8806SB
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 × 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 IV conversion resistance value of PDE Resistance-connected pin setting the IV 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=25°C)
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
AN8806SB
s Recommended Operating Range (Ta=25°C)
Parameter Operating Supply Voltage Range Symbol VCC
ICs for CD/CD-ROM Player
Range 3.4V ~ 5.5V
s Electrical Characteristics (Ta=25°C±2°C)
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 1H Focus Balance Variable Range 1L Focus Balance Variable Range 2H Focus Balance Variable Range 2L Frequency Characteristics of Focus Error Amp. Tracking Error Amp. Output Offset Voltage of Tracking Error Amp. Crosstalk Quantity of Tracking Error Offset Balance IV Conversion Gain of Tracking Error Amp. IV Conversion Relative Gain of Tracking Error Amp. Tracking Balance Variable Range 1H Tracking Balance Variable Range 1L Tracking Balance Variable Range 2H Tracking Balance Variable Range 2L 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) Note) VRFOF RRF DRRF GRF VCC=5V VCC=5V VCC=5V VCC=5V, f=500kHz, 3MHz 75 45.0 10 2.5 0 56.5 0 0 75 68.0 10 2.5 mV k % dB VFOOF VFOOFB RFO DRFO BFO1H BFO1L BFO2H BFO2L GFO VCC=5V VCC=5V, VFB=VREF ±1V 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 250 200 65 12 0.15 1.19 1.19 0.15 4.5 93 0 0.25 1.70 1.70 0.25 3 0 250 200 121 12 0.35 2.21 2.21 0.35 1.5 dB mV mV k % 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
VTROF VTROFB RTR DRTR BTR1H BTR1L BTR2H BTR2L 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=1kHz, 46kHz
63 200 420 15 0.185 1.20 1.20 0.175 4.5
0
63 200
mV mV k %
600 0 0.285 1.75 1.75 0.275 3
780 15 0.385 2.30 2.30 0.375 1.5
dB
VCRH VCRL
VCC=5V, VTB=VREF, f=2kHz VCC=5V, VTB=VREF, f=2kHz
4.2 0.8
V V
The value may fluctuate by the influence of printed board, socket and etc.
ICs for CD/CD-ROM Player
s Electrical Characteristics (Cont.) (Ta=25°C±2°C)
Parameter AGC AGC max. Gain EQ Characteristics 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) LD ON Operation Voltage (2) 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 GCEAENV RCEA RENV VOPENV VOPCEA 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 VLDONH VLDOFFH VLD (1) VLD (2) VCC=5V VCC=5V VCC=5V, V1 : DC Sweep VCC=5V, V1 : DC Sweep 3.5 3.5 0.135 0.116 0.170 0.140 IOFTR VOFTRH VOFTRL VCC=5V VCC=5V, f=2kHz Rectangle Wave VCC=5V, f=2kHz Rectangle Wave 1.0 4.2 1.4 IBDO VBDOH VBDOL VCC=5V VCC=5V, f=2kHz Rectangle Wave VCC=5V, f=2kHz Rectangle Wave 1.0 4.2 1.4 GAGC DGEQ GOPAGC GcmAGC GfAGC VNRF VNRFH VNRFL VCC=5V, f=500kHz, Sine Wave VCC=5V, f=1.5MHz, Sine Wave f=500kHz, VIN=500mVPP f=500kHz, VIN=100mVPP f=3MHz, VIN=500mVPP f=500kHz f=500kHz f=500kHz 11.0 0.2 4 2 1.5 0.067 4.2 15.5 1.0 6 6 0 0.105 Symbol Condition min. typ.
AN8806SB
max. 20.0 2.0 9 8 2.5 0.142 0.8 1.8 0.8 1.8 0.8
Unit dB dB dB dB dB VPP V V µA V V µA V V V V
0.205 0.164 98 52 0.8 13.5 25 9.5 9.5 70 200
V V mV mV V V µA dB k k mV mV
AN8806SB
ICs for CD/CD-ROM Player
s Operational Description (The values shown below are design values when supply voltage VCC = 5V.) · RFAmplifier
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 RFand RFOUT is 12k.
Light level 48k 12k
36
+
48k 10k 10k 6
RRF Dark leve 7
A D
B C
+
35
+
RRF (T) =48k ×
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
+
×2 fC = 30kHz
29 VC
+
Figure 2 : Focus Error Amplifier
ICs for CD/CD-ROM Player
AN8806SB
The VCBA is for focus balance adjustment. Connecting 47 k of 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 fC646kHz
20k E 33
VCBA
+
Subtraction VREF 31 470k 26
25
+
F
34
VCBA
20k
+
30
+
Figure 3 : Tracking Error Amplifier
AN8806SB
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 toVREF 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. 1VPP ~ 500mVPP ~ 250mVPP, and output is 1VPP. Pin9 is a connecting pin with capacity for constructing the AGC loop filter, and it is recommended that the external capacitor of 1µF around should be connected to it for VCC.
RF
VCC
1µF ARF 8 9 10
EQ
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
AN8806SB
· 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
· 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
VCC LD OFF 21 10µF
+
10
2 LD
1 PD
4 LDP
3 LD ON/OFF
Figure 5 : APC
By connecting Pin4 to OPEN or GND, the reference voltage of LD can be switched. Connection to OPEN makes the reference voltage approx. 170mV and connection to GND makes it approx. 140mV.
· 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 AN8806SB 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.
AN8806SB
· Envelope Detection
ICs for CD/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 100 pF 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 11
CEA 12
ENV 19
AGC
ENV Detection
Figure 6 : Envelope Detection