AN8807

AN8807SB PANASONIC | Alldatasheet

Document overview

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Technical content

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. n Features

• Single supply operation
• I–V amplifier, tracking error amplifier, focus error ampli- fier, RF amplifier and APC built-in
• Detectors of DO, CROSS, OFTR and vibration built-in
• Combination with the MN662710RA providing complete automatic adjustment for tracking balance, tracking gain, tracking offset, focus balance, focus gain and focus offset AN8807SB Three-Beam Method Head Amplifier IC for CD-ROM 0.3–0.11 0.1–0.1 2.85–0.2 0.5 1.3–0.25 1.3–0.25 0.2+ 0.1 – 0.05 0.8 15.2–0.3 11.93–0.3 8.4–0.3 Umit : mm 36-lead SSOP package (SSOP036-P-0450A)

AN8807SB ICs for CD-ROM Pla yer A A B D D C Subtracter A G C R F D et. EN V D et. B D O O FTR A+C B+D PD FR F E PD ER R F– R FO U T FEO U T FE– C A C C A R F R FD ET C EN V C EA EN V C SB D O B D O C SB R T O FTR V R EF LD O FF LD LD O N /O FFFDV D et.TEB PFTE–TEO U T C .C R S C R O SSTB A L V C C + + +FB A L V C B A V C B A V C B A V C B A + – + – + – 6 7 29 27 28 8 9 10 17 11 12 19 312223262542430 +– +– +– +– n Block Diagram

ICs for CD/CD-ROM Pla yer AN8807SB Pin N o. Pin N am e n Pin D escription I/O Function D escription P D LD LD O N C . C R S V C C R F– R FO U T R FIN C . A G C A R F C . EN V C . EA C . SB D O B D O C . SB R T O FTR N R FD ET G N D EN V V R EF LD O FF V D ET TEB PF C R O SS TEO U T TE– FEO U T FE– FB A L TB A L PD FR PD ER PD E PD F PD B D PD A C I O I I O I O O O O O O I O I O O I O I I I I I I I Signal input of P D for LD output m onitor C onnected to base of external Tr for LD drive O N /O FF sw itching of LD A PC C apacity connecting pin for C R O SS Supply connecting pin R everse rotation input pin of R F A m p. for connecting a resistance O utput pin of R F A m p. (reverse rotation am p.) R F A G C input pin C -connecting pin for R F A G C loop filter R F output pin after A G C C -connecting pin for R F C -connecting pin for am p. C -connecting pin for low speed detection of dark level D O B D O detection output pin; positive logic C -connecting pin for O FTR low speed detection O FF TR A C K detection output pin; positive logic O utput pin of R F signal am plitude detection; negative logic G round pin EN V output pin V C C × 0.5 (V ) output pin Input pin for forced stop of LD A PC O utput pin of vibration detection Input pin of vibration detection O utput pin of TE C R O SS detection signal O utput pin of TE A m p. Inverting input pin of TE A m p. for connecting a resistance O utput pin of FE A m p. Inverting input pin of FE A m p. for connecting a resistance C ontrol signal input pin for FO balance adjustm ent C ontrol signal input pin for TE balance adjustm ent R esistance-connected pin setting the I –V conversion resistance value of PD E R esistance-connected pin setting the I –V conversion resistance value of PD F C onnected to PIN D iode E C onnected to PIN D iode F C onnected to B /D of astigm atic 4-division PD C onnected to A /C of astigm atic 4-division PD n Absolute M axim um R atings (Ta=25˚C ) 240 –20 ~ + 75 –55 ~ + 125 V C C IC C PD Topr Tstg Supply V oltage Supply C urrent Pow er D issipation O perating A m bient Tem perature Storage Tem perature V m A m W Param eter Sym bol R ating U nit

AN8807SB ICs for CD-ROM Pla yer n R ecom m ended O perating R ange (Ta=25˚C ) 3.4V ~ 5.5V Param eter Sym bol R ange O perating Supply V oltage R ange V C C Focus Error Am p. Tracking Error Am p. C R O SS D etection R F-Am p. n Electrical C haracteristics (Ta=25˚C –2˚C ) Param eter Sym bol C ondition m in. typ. m ax. U nit Total C ircuit C urrent 10.0Itot 19.0 m A14.5V C C =5V V R EF O utput V oltage 2.20V R EF 2.80 V2.50V C C =5V V FO –O F –300 0 300 m VO utput O ffset V oltage of Focus Error A m p. V C C =5V V FO –O FB –200 200 m VV C C =5V , V FB =V R EF–1V A pplied C rosstalk Q uantity of Focus Error O ffset B alance R FO 65 93 121 kΩV C C =5V , V FB =V R EF I –V C onversion G ain of Focus Error A m p. D R FO –12 0 12 %V C C =5V , V FB =V R EF I –V C onversion R elative G ain of Focus Error A m p. B FO 1–H 0.15 0.25 0.35V C C =5V , V FB =V R EF +1VFocus B alance V ariable R ange 1–H B FO 1–L 1.19 1.70 2.21V C C =5V , V FB =V R EF –1VFocus B alance V ariable R ange 1–L B FO 2–H 1.19 1.70 2.21V C C =5V , V FB =V R EF +1VFocus B alance V ariable R ange 2–H B FO 2–L 0.15 0.25 0.35V C C =5V , V FB =V R EF –1VFocus B alance V ariable R ange 2–L G FO –4.5 –3 –1.5 dBV C C =5V , f=1kH z, 30kH z InputFrequency C haracteristics of Focus Error A m p. V TR –O F –63 0 63 m VO utput O ffset V oltage of Tracking Error A m p. V C C =5V V TR –O FB –200 200 m VV C C =5V , V TB =V R EF –1V A pplied C rosstalk Q uantity of Tracking Error O ffset B alance R TR 420 600 780 kΩV C C =5V , V TB =V R EF I –V C onversion G ain of Tracking Error A m p. D R TR –15 0 15 %V C C =5V , V TB =V R EF I –V C onversion R elative G ain of Tracking Error A m p. B TR 1–H 0.185 0.285 0.385V C C =5V , V TB =V R EF +1VTracking B alance V ariable R ange 1–H B TR 1–L 1.20 1.75 2.30V C C =5V , V TB =V R EF –1VTracking B alance V ariable R ange 1–L B TR 2–H 1.20 1.75 2.30V C C =5V , V TB =V R EF +1VTracking B alance V ariable R ange 2–H B TR 2–L 0.175 0.275 0.375V C C =5V , V TB =V R EF –1VTracking B alance V ariable R ange 2–L G TR –3.8 –2.3 – 0.8 dBV C C =5V , f=10kH z, 100kH zFrequency C haracteristics of Tracking Error A m p. V C R –H 4.2 VV C C =5V , V TB =V R EF f=10kH zC R O SS O utput H Level V C R –L 0.8 VV C C =5V , V TB =V R EF f=10kH zC R O SS O utput L Level R F-A m p. O ffset V oltage –75V R F–O F 75 m V0V C C =5V R F-A m p. I–V C onversion G ain 45.0R R F 68.0 kΩ56.5V C C =5V R F-A m p. I–V C onversion R elative G ain 1 –10D R R F 10 %0V C C =5V G R F –2.5 0 2.5 dBV C C =5V , f=500kH z, 3M H zR F-A m p. Frequency C haracteristics 1 N ote) N ote) The value m ay fluctuate by the influence of printed board, socket and etc.

ICs for CD/CD-ROM Pla yer AN8807SB Param eter Sym bol C ondition m in. typ. m ax. U nit AG C G A G C 10.0 14.5 19.0 dBV C C =5V , f=500kH z, Sine W aveA G C M ax. G ain G O P–A G C 4 6 9 dBf=500kH z, V IN =500m V P–PA G C O peration G ain G cm –A G C 3 6 9 dBf=500kH z, V IN =100m V P–PA G C C om pressibility G f–A G C –2 0 2 dBf=3M H z, V IN =500m V P–PA G C Frequency C haracteristics R FD ET R FD ET D etection O peration 0.065V N R F 0.135 V P–P0.1f=500kH z R FD ET H Level 4.2V N R F–H Vf=500kH z R FD ET L Level V N R F–L 0.8 Vf=500kH z BD O B D O D etection C urrent 1.0IB D O 1.8 µA1.4V C C =5V B D O H Level 4.2V B D O –H VV C C =5V , f=2kH z R ectangle W ave B D O L Level V B D O –L 0.8 VV C C =5V , f=2kH z R ectangle W ave O FTR O FTR D etection C urrent 1.0IO FTR 1.8 µA1.4V C C =5V O FTR H Level 4.2V O FTR –H VV C C =5V , f=2kH z R ectangle W ave O FTR L Level V O FTR –L 0.8 VV C C =5V , f=2kH z R ectangle W ave LD – APC LD O N H Input Level 3.5V LD O N –H VV C C =5V LD O FF H Input Level 3.5V LD O FF–H VV C C =5V V LD (1) 0.135 0.170 0.205 VV C C =5V , V 1 : D C Sw eepLD O N O peration V oltage (1) V. D etection V D et. (1) 52 75 98 m VV C C =5V , V 23 : D C Sw eepV . D et. Level (1) V D et. (2) –98 –75 –52 m VV C C =5V , V 23 : D C Sw eepV . D et. Level (2) V D et.–H 4.2 VV C C =5V , V 23 : D C Sw eepV . D et. H Level V D et.–L 0.8 VV C C =5V , V 23 : D C Sw eepV . D et. L Level 3TEN V C EN V D etection C urrent 8.5IC EN V 13.5 µA11V C C =5V C EA -EN V Transm ission C haracteristics 21G C EA –EN V 25 dB23V C C =5V C EA Input Im pedance 6.5R C EA 9.5 kΩ8.25V C C =5V EN V O utput Im pedance 6.5R EN V 9.5 kΩ8.25V C C =5V EN V -A m p. O ffset V oltage –70V O P–EN V 70 m V0V C C =5V C EA -A m p. O peration V oltage 50V O P–C EA 200 m V125V C C =5V n Electrical C haracteristics (C ont.) (Ta=25˚C –2˚C )

AN8807SB ICs for CD-ROM Pla yer 48kΩ 10kΩ 12kΩ 10kΩ 48kΩ A B D C

36 R R F

48kΩ 48kΩ A B D C 2728 20kΩ 20kΩ B +D V C B A A + C R FE V C × 2 fC =30kH z n O perational D escription (The values show n below are design values w hen supply voltageV C C =5V .)

• R F Am plifier Figure 1 : R F Am plifier Figure 2 : Focus Error Am plifier A s show n in Figure 1, R F signals are generated by three-beam m ethod pick-up. Equivalent resistance to R FO U T (Pin7) is 57.6kΩ , w hen resistance betw een R F– and R FO U T is 12kΩ .
• Focus Error Am plifier A s show n in Figure 2, the operation result of (A +C ) – (B +D ) is outputted to FEO U T (Pin27). Equivalent resistance to FEO U T is 96kΩ , w hen resistance betw een FE and FEO U T is 20kΩ . Light level D ark level R R F (T)= 48kΩ × R R F 10kΩ

ICs for CD/CD-ROM Pla yer AN8807SB The V C B A is for focus balance adjustm ent. C onnecting 47kΩ of external resistance toPin299, signal ratio betw een A +C and B +D can be controlled as show n in Table 1.

• Tracking Error Am plifier A s show n in Figure 3, the tracking error am plifier receives the output currents E and F of three-beam m ethod pin photo diode for sub-beam detection, and outputs the operation result of E–F to TEO U T (Pin25). Table 1 Figure 3 : Tracking Error Am plifier E 33 470kΩ 32V R EF V C B A F 34 470kΩ 31V R EF V C B A Subtraction 26 20kΩ fC 6100kH z 1.5V 2.5V 3.5V 0.14 1.0 7.0 7.0 1.0 0.14 V C A + C B + D B + D A + C

AN8807SB ICs for CD-ROM Pla yer Pin31, and 32 are used to m ake the resistance converting the current to voltage variable. W hen these pins are directly connected to V R EF and 20kΩ of resistance is connected betw een TE and TE–, and betw een TE and TEO U T respectively, equivalent resistance to TEO U T is 629kΩ .

• AG C In order to absorb the attenuation of R F signal by disk, pick-up dispersion, finger print and other factors, A G C circuit for R F is incorporated. The input im pedance of Pin8 is approx. 27.9kΩ . B y Pin10 (A R F), the gain-controlled R F-signal is outputted. Input allow able level is approx. 1V P–P ~ 500m V P–P ~ 250m V P–P, and output is 1V P–P. Pin9 is a connecting pin w ith capacity for constructing the A G C loop filter. It is recom m ended that the external capacitor of 1µF around should be connected to it for V C C . Table 2 The V C B A is for tracking balance adjustm ent in the sam e w ay of for focus. Table 2 show s the tracking balance ratio under the sam e conditions as show n in Table 1. V C E/F F/E 1.5V 0.14 7.0 2.5V 1.0 1.0 3.5V 7.0 0.14 Figure 4 : AG C 9 108 A R F A G C R F 1µF V C C
• R FD ET The R FD ET detects am plitude of R F signal inputted to Pin8. Threshold value is approx. 100m V (f=500kH z), and R F Present=L, R F A bsent=H are outputted.

ICs for CD/CD-ROM Pla yer AN8807SB

• BD O D etection B D O is detected by the low speed detection circuit and high speed detection circuit. The high speed detection circuit is incorporated. O n the other hand, the capacitor of the low speed detection circuit m ust be connected to Pin13. The capacity value is 2200pF and it is recom m ended that it should be connected for V C C . W hen the capacity value of Pin13 is increased, B D O is detected w ith large R F m issing rate. W hen it is decreased, B D O can be detected w ith sm all R F m issing rate.
• O FTR D etection O FTR detection reversely corresponds w ith B D O detection. H ow ever, its detection m ethod is the sam e as for B D O . C apacitor for the low speed detection m ust be connected to Pin15. It is recom m ended that it should be connected to V C C at 2200pF in the sam e w ay as for Pin13. The relation betw een the capacity value and O FTR detection tim ing is as the sam e for B D O . B D O present=H B D O absent=L O FTR =H O ff from O FTR =L LD O N /O FFPD LD LD O FF V C C 10Ω 170m V
• APC Figure 5 : APC
• R eference Supply Servo reference supply is incorporated. Pin20 outputs V C C /2, and has approx. 3m A of current capacity for sink/source. It is recom m ended that it should be given 1µF to 10µF of capacity in addition. The reference voltage of LD is approx. 170m V fixed.
• Vibration D etection The A N 8807SB has a w ind com parator of approx. –75 m V . A bnorm al vibration com ponents of tracking error are detected and the data for w hether vibration is present or not is outputted to Pin22. 10µF +