AN8808SB

AN8808SB PANASONIC

Document overview

• Manufacturer or author: Provided By digicamel.com
• PDF pages: 10

Technical content

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. 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 MN6627XX series providing com- plete automatic adjustment for tracking balance, track- ing gain, tracking offset, focus balance, focus gain and focus offset n Application CD player AN8808SB Three-Beam Method Head Amplifier IC for CD (supporting the hologram pick-up) 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)

ICs for CD/CD-ROM Pla yerAN8808SB F A B D E C 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 FR R F– R FO U T FEO U T FE– R FIN 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 FFPDV 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 Subtraction SubtractionV 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 AN8808SB n Pin D escription Pin N o. Pin N am e 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 am plitude detection Input pin of am plitude detection O utput pin of TE C R O SS detection signal O utput pin of TE A m p. R everse rotation input pin of TE A m p. for connecting a resistance O utput pin of FE A m p. R everse rotation 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 –30 ~ + 85 –55 ~ + 125 V m A m W 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 Param eter Sym bol R ating U nit

ICs for CD/CD-ROM Pla yerAN8808SB 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 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 V R EF O utput V oltage O utput O ffset V oltage of Focus Error A m p. C rosstalk Q uantity of Focus Error O ffset B alance I-V C onversion G ain of Focus Error A m p. I-V C onversion R elative G ain of Focus Error A m p. Focus B alance V ariable R ange 1 – H Focus B alance V ariable R ange 1 – L Focus B alance V ariable R ange 2 – H Focus B alance V ariable R ange 2 – L Frequency C haracteristics of Focus Error A m p. O utput O ffset V oltage of Tracking Error A m p. C rosstalk Q uantity of Tracking Error O ffset B alance I-V C onversion G ain of Tracking Error A m p. I-V C onversion R elative G ain of Tracking Error A m p. Tracking B alance V ariable R ange 1 – H Tracking B alance V ariable R ange 1 – L Tracking B alance V ariable R ange 2 – H Tracking B alance V ariable R ange 2 – L Frequency C haracteristics of Tracking Error A m p. C R O SS O utput H Level C R O SS O utput L Level 8.8 2.20 12.6 2.50 m A V V C C =5V V C C =5V V C C =5V V C C =5V V FB =V R EF–0.9V A pplied 16.4 2.80 Itot V R EF V C C =5V V C C =5V V C C =5V V C C =5V , f=500kH z, 3M H z R F-Am p. R F-A m p. O ffset V oltage R F-A m p. I –V C onversion G ain R F-A m p. I –V C onversion R elative G ain 1 R F-A m p. Frequency C haracteristics 1 N ote) V R E – O F R R F D R R F G R F –75 –15 –1.6 1.5 108 3.8 m V kΩ dB N ote) The value m ay fluctuate by the influence of printed board, socket and etc. V FO – O F V FO – O F8 R FO D R FO B F01– H B F01 – L B F02 – H B F02 – L G FO V TR – O F V TR – O FB R TR D R TR B TR 1– H B TR 1 – L B TR 2 – H B TR 2 – L G TR V C R – H V C R – L –350 –300 539 –15 0.20 1.23 1.23 0.20 –4.5 770 0.31 1.75 1.75 0.31 350 300 1001 0.42 2.21 2.21 0.42 1.5 m V m V kΩ dB –150 –180 1099 –15 0.25 1.19 1.19 0.24 –3.5 4.2 1570 0.38 1.70 1.70 0.37 150 180 2041 0.51 2.21 2.21 0.50 – 0.5 0.8 m V m V kΩ dB V V V C C =5V , V FB =V R EF V C C =5V , V FB =V R EF V C C =5V , V FB =V R EF +0.9V V C C =5V , V FB =V R EF – 0.9V V C C =5V , V FB =V R EF +0.9V V C C =5V , V FB =V R EF – 0.9V V C C =5V , f=1kH z, 30kH z Input V C C =5V V C C =5V V TB =V R EF–0.9V A pplied V C C =5V , V TB =V R EF V C C =5V , V TB =V R EF V C C =5V , V TB =V R EF +0.9V V C C =5V , V TB =V R EF – 0.9V V C C =5V , V TB =V R EF +0.9V V C C =5V , V TB =V R EF – 0.9V V C C =5V , f=10kH z, 100kH z V C C =5V , V TB =V R EF, f=10kH z V C C =5V , V TB =V R EF, f=10kH z

ICs for CD/CD-ROM Pla yer AN8808SB V C C =5V , f=500kH z, Sine W ave f=500kH z, V IN =500m V P–P f=500kH z, V IN =100m V P–P f=3M H z, V IN =500m V P–P f=500kH z f=500kH z f=500kH z V C C =5V V C C =5V , f=2kH z R ectangle W ave V C C =5V , f=2kH z R ectangle W ave V C C =5V V C C =5V , f=2kH z R ectangle W ave V C C =5V , f=2kH z R ectangle W ave V C C =5V V C C =5V V C C =5V , V 1 : D C Sw eep V C C =5V , V 23 : D C Sw eep V C C =5V , V 23 : D C Sw eep V C C =5V , V 23 : D C Sw eep V C C =5V , V 23 : D C Sw eep AG C R FD ET BD O O FTR LD – APC V. D etection 3TEN V n Electrical C haracteristics (C ont.) (Ta=25˚C –2˚C ) Param eter Sym bol C ondition m in. typ. m ax. U nit A G C M ax. G ain A G C O peration G ain A G C C om pressibility A G C Frequency C haracteristics G A G C G O P – A G C G cm – A G C G f – A G C 10.0 0.085 4.2 1.0 4.2 1.0 4.2 3.5 3.5 0.135 –98 4.2 8.5 6.6 6.2 –85 55.0 19.0 0.165 0.8 1.8 0.8 1.8 0.8 0.205 –52 0.8 13.5 9.4 220.0 dB dB dB dB V P–P V V µA V V µA V V V V V m V m V V V µA dB kΩ kΩ m V m V 14.5 0.125 1.4 1.4 0.170 –75 8.3 7.8 137.5 V N R F V N R F – H V N R F – L IB D O V B D O – H V B D O – L IO FTR V O FTR – H V O FTR – L V LD O N – H V LD O FF – H V LD V D et. (1) V D et. (2) V D et. – H V D et. – L IC EN V G C EA – EN V R C EA R EN V V O P – EN V V O P – C EA R FD ET D etection O peration R FD ET H Level R FD ET L Level B D O D etection C urrent B D O H Level B D O L Level O FTR D etection C urrent O FTR H Level O FTR L Level LD O N H Input Level LD O FF H Input Level LD O N O peration V oltage V . D et. Level (1) V . D et. Level (2) V . D et. H Level V . D et. L Level C EN V D etection C urrent C EA – EN V Transm ission C haracteristics C EA Input Im pedance EN V O utput Im pedance EN V -A m p. O ffset V oltage C EA -A m p. O peration V oltage V C C =5V V C C =5V V C C =5V V C C =5V V C C =5V V C C =5V

ICs for CD/CD-ROM Pla yerAN8808SB 106kΩ 10kΩ 12kΩ 10kΩ 106kΩ A B D C

36 R R F

106kΩ 106kΩ A B D C 2728 20kΩ B + D V C B A A + C R FE V C Subtraction 36 – 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 127kΩ , w hen resistance betw een R F– and R FO U T is 12kΩ . 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 212kΩ , w hen resistance betw een FE and FEO U T is 20kΩ . Light level D ark level R R F(T)=106kΩ × R R F 10kΩ n O perational D escription (The values show n below are design values w hen supply voltageV C C =5V .)

• R F Am plifier
• Focus Error Am plifier

ICs for CD/CD-ROM Pla yer AN8808SB

• Tracking Error Am plifier Figure 3 : Tracking Error Am plifier A + C B + D B + D A + C 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). E 33 470kΩ 32V R EF V C B A F 34 470kΩ 31V R EF V C B A Subtraction 20kΩ 20kΩ fC 6100kH z The V C B A is for focus balance adjustm ent. C onnecting 47kΩ of an external resistance to Pin29, signal ratio betw een A + C and B + D can be controlled as show n in Table 1. 1.5V 2.5V 3.5V 0.14 1.0 7.0 7.0 1.0 0.14 V C Table 1

ICs for CD/CD-ROM Pla yerAN8808SB

• AG C Table 2 Figure 4 : AG C
• R FD ET Pins31 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 . 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 yPin10 (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, and it is recom m ended that the external capacitor of 1µF around should be connected to it for V C C . 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 9 108 A R F A G C R F 1µF V C C 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.
• 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 this 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. B D O present = H B D O absent = L

ICs for CD/CD-ROM Pla yer AN8808SB

• O FTR D etection O FTR =H O ff from O FTR =L
• APC Figure 5 : APC
• R eference Supply
• Vibration 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 . 170m V LD O N /O FFPD LD LD O FF V C C 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. The A N 8808SB has a w ind com parator of approx. –75m 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.