|
If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
Datasheet File OCR Text: |
BA6387K Optical disc ICs Preservo amplifier for CD players BA6387K The BA6387K is a preservo amplifier for CD players. By using this paired with a ROHM DSP, a servo and main signal system can be configured with few external components and low power consumption. !Applications CD players !Features 1) Internal RF and AGC circuits. 2) Internal APC circuit. 3) Internal auto asymmetry circuit. 4) Internal disc defect detector. 5) Internal focus protect function against disc defects. !Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 9 400* -25~+75 -55~+125 Unit V mW C C * Reduced by 4mW for each increase in Ta of 1C over 25C. !Recommended operating conditions (Ta = 25C) Parameter Power supply voltage Symbol VCC Limits 2.4~5.5 Unit V BA6387K Optical disc ICs !Block diagram CAGC RFO ASY PLH BLH RFRFI VCC 24 23 22 21 20 19 18 18 17 45 - + 20k B 2k 25 2k 60k EFM 20k - + DET BLOCK 16 20k A 26 20k - + 10k 44.7k PS PL BL BS MIRR 20k 20k 20k 20k 2k 2k - + 60k 10k + - 15 39k C 27 39k + - 44.7k 0.6V + DEFECT 14 + - 30p 160k 28 30p FOK HOLD BLOCK SCRATCH CONTROL FOK LOOP ON 29 10k FEB VB + 100k 100k - FOCUS BIAS FOCUS SWITCH GAIN 6dB 5p TEO 20k BL 20k - + + - 30 0.2V FE' 31 10k 50k 12p - + 2k 32 2k 402k 10k 12p + 50k 5p 18 100k E 20k PL 20k 1M - + 260k 1 2 3 4 5 6 7 F FO AGND FI CAPC LD PD R/H - D 160k + - FE 13 + - FOK 12 FON RAMP OSC 11 + - - + - TE TEO 13.3k 10 SC 9 2.64k MUTE High=off 8 BA6387K Optical disc ICs !Pin descriptions Pin No. 1 2 3 4 5 6 7 8 Pin name F FO AGND FI CAPC LD PD R/H F input F output Analog GND F gain adjustment feedback For capacitor for APC phase compensation APC amplifier output APC amplifier input For capacitor for ramp wave/ loop off For resistor for scratch depth adjustment Tracking error output Focus on control Focus OK comparator output Focus error output 1 Defect signal output Mirror signal output EFM signal output 23 24 25 26 27 28 29 30 31 32 RFO RFB A C D FEB VB FE' E Function Pin No. 17 18 19 20 21 22 Pin name ASY CAGC BLH PLH VCC RFI Function Auto-asymmetry control input For capacitor for AGC constant For capacitor for bottom long For capacitor for peak long Power supply RF output capacity coupling reinput RF summing amplifier output RF summing amplifier feedback input B input A input C input D input Focus error bias input Bias amplifier output Focus error output 2 E input 9 10 11 12 13 14 15 16 SC TE FON FOK FE DEFECT MIRR EFM BA6387K Optical disc ICs !Electrical characteristics (unless otherwise noted, Ta = 25C and VCC = 2.5V) Parameter Quiescent current Bias amplifier Bias voltage Maximum output high level voltage Maximum output low level voltage RF amplifier Output offset voltage Voltage gain Maximum output high level amplitude Maximum output low level amplitude Cutoff frequency FE amplifier Output offset voltage Voltage gain AC Voltage gain BD Voltage gain difference Maximum output high level amplitude Maximum output low level amplitude Frequency characteristics TE amplifier Output offset voltage Voltage gain E Voltage gain F Voltage gain difference Maximum output high level amplitude Maximum output low level amplitude Frequency characteristics FOK comparator Threshold voltage Output high level voltage Output low level voltage Maximum operating frequency Asymmetry amplifier Output offset voltage Voltage gain 1 Voltage gain 2 Maximum output high level amplitude Maximum output low level amplitude VOFAS G1AS G2AS VOHAS VOLAS -60 3 8.5 0.90 6 11.5 1.10 -1.10 60 9 14.5 -0.90 mV dB dB V V Input pin 22, 80mVP-P, 1kHz Input pin 17, 80mVP-P, 1kHz V7 = VB 0.8 V6 = VB 0.4 * * Symbol IQ Min. - Typ. 8.7 Max. 12.7 Unit mA Conditions - VB IOH IOL 1.12 3.0 3.0 1.25 - 1.38 - V mA mA Bias fluctuation below 200mV Bias fluctuation below 200mV VOFRF GRF VOHRF VOLRF FCRF -1.02 21.0 0.90 - -0.90 24.0 1.10 -1.10 6 -0.78 27.0 -0.90 - V dB V V MHz V8 = 0.8V, SG5 = 30mVP-P, 1kHz Simultaneous AC and BD input V9 = VB + 0.25V, VB-0.05V -3dB point * * VOFFE GFEAC GFEBD GFE VOHFE VOLFE FCFE -80 26 26 -3 0.90 19 0 29 29 0 1.10 -1.10 22 80 32 32 3 -0.90 25 mV dB dB dB V V dB SG5 = 30mVP-P, 1kHz SG6 = 30mVP-P, 1kHz Measurement with AC and BD input V9 (V10) = VB 0.15V SG5 (SG6) = 60mVP-P, 60kHz * * VOFTE GTEE GTEF GTE VOHTE VOLTE FCTE -80 27 27 -3 0.90 19 0 30 30 0 1.10 -1.10 22 80 33 33 3 -0.90 25 mV dB dB dB V V dB V1 = VB + 0.1V V2 = VB + 0.1V SG1 (SG2) = 60mVP-P, 60kHz Input pin 22 SG1 = 30mVP-P, 1kHz SG2 = 30mVP-P, 1kHz - * * * VTHFK VOHFK VOLFK FMXFK -0.42 2.0 45 -0.30 - -0.18 0.5 - V V V kHz V7 = VB-0.42V V7 = VB-0.18V - * BA6387K Optical disc ICs Parameter APC Output voltage 1 Output voltage 2 Reference voltage Frequency characteristics AGC Reference voltage 1 Reference voltage 2 Attack time Recovery time Mirror detector Output high level voltage Output low level voltage Minimum operating frequency Maximum operating frequency Minimum input operating voltage Maximum input operating voltage Defect detector Output high level voltage Output low level voltage Minimum operating frequency Maximum operating frequency Minimum input operating voltage Maximum input operating voltage Scratch depth Ramp wave generator circuit Period High level limit voltage Low level limit voltage FON pin Inflow current Input threshold voltage Loop on unit Loop off delay time FZC comparator Input sensitivity level Zero cross sensitivity level * Standards are with VB reference. ** When FON is LOW, 8 voltage is VB. ** The ramp wave begins at the bottom. ** The loop will not turn on when the ramp wave is at the bottom. ** Pin 8 is charged rapidly when the loop turns on. Symbol Min. Typ. Max. Unit Conditions VO1AP VO2AP VAPR FAP 1.90 190 -5 2.30 1.0 200 -1 1.4 210 3 V V mV dB 230mV input at pin 7 170mV input at pin 7, I2 = 1mA SG7 = 40mVP-P, 500Hz VAGC1 VAGC2 RATT RRCV 0 180 70 0.7 195 100 1.0 100 210 130 1.3 mV mV k M V8 = 0.8V, RFO = 1.2VP-P V8 = 0.8V, RFO = 0.7VP-P Measurement of internal R VOHMR VOLMR FMNMR FMXMR VMNMR VMXMR 2.0 30 1.2 - 0.5 600 0.2 - V V Hz kHz VP-P VP-P RL = 15k - VOHDF VOLDF FMNDF FMXDF VMNDF VMXDF VSC 2.0 2 1.2 0.13 0.20 0.5 1 0.5 0.27 V V kHz kHz VP-P VP-P V RL = 15k - ISIRA VLHRA VLLRA 220 80 -168 340 124 -124 460 168 -80 ms mV mV FEO output value - * IIFON VTHFO 10.4 1.10 13.5 1.45 16.6 1.80 A V - tOFLO 4.0 6.6 10.0 ms - VFZH VFZL 320 120 400 200 480 280 mV mV - BA6387K Optical disc ICs !Measurement circuit SW11 A OFF B SG4 N VCC I1 C A SW3 V11 10k 3300p A SW10 B OFF CB A SW4 SW9 A C 91k V O V7 SW21 V V T 3300p A 1 B OFF 10k SW12 20k SG3 V6 SG5 V8 A B C 27k 25 SW15 SW13 27k 26 A B 24 RF- 23 RFO 22 RFI 21 VCC 20 PLH 19 BLH 18 CAGC 17 ASY M SW8 16 SW23 15k V EFM V9 10k MIRR 15 V V SW24 L K 15k f1 SG6 27k OFF A B 27k 28 C SW14 SW17 SW16 30 VB FON 11 29 FEB D FE 13 27 C DEFECT 14 f SW7 V10 BA6387K FOK 12 SW25 100k J I V 82k V SW18 B 33k OFF A I2 V P SW22 V12 62k 31 FE' TE 10 H A V SW6 10k S V5 AGND R/H 32 E FO F CAPC V Q SC 9 PD LD FI 1 2 3 4 5 6 7 8 SW26 G V 22k 62k SW1 C B SG1 V1 SG2 A B SW2 C 13k SW20 A B B SW19 A B A D V3 C A B SW5 A A A B 26k C 1 A E V4 V F V2 V C 1 I2 470p 4.7 V V 1k 47 U V 1 SG7 Fig.1 10k BA6387K Optical disc ICs !Circuit operation (1) RF amplifier, FOK comparator 20k 24 23 0.01 22 - + 45 20k 10k 10k 60k 25 2k 28 2k + - 20k + - 20k 20k 60k 26 2k 27 2k + 0.6V - - 12 + Fig.2 RF and FOK block RFO is shifted downwards from VB by 0.9V. However, the resistance between pins 23 and 24 is set to 20k and if this resistance is changed use external components to adjust the shift back to 0.9V. Have the feedback resistance 10k or greater. If the DC component of RF rises 0.3V, then FOK becomes high. BA6387K Optical disc ICs (2) FE amplifier and focus search 30p ON 160k - 160k + 10k + LOOP ON - OFF 20k - + 13 44.7k 44.7k 20k 30p 11 FOK ON OFF x3 I I / 10 I 60k 25 2k 28 2k + - 60k 26 2k 27 2k 29 31 + - 8 1F Fig.3 Focus error block The voltage for focus search is obtained by the charging and discharging of the capacitor attached to pin 8. The charging current is I / 10 and the discharging current is I. The FEO output amplitude (VSERCH) at this time is determined by the formula given below. VSERCH = I x 15k x 2 (VB reference) Moreover, from Fig.3, I can be approximated by the formula given below. Set R11 so that I becomes 2A or greater. Apply biasing to the focus error signal from pin 29. If no adjustment occurs, pin 29 = VB . The timing charts when the focus loop turns ON or OFF are given on the next page. I= VCC - 1.4 65k + R11 x 1 3 65k R11 BA6387K Optical disc ICs (1) LOOP ON timing When FOK turns high, the fall of FE' is detected and the FOCUS LOOP turns ON. 0.2V 0.4V FE' (pin31) pin8 FZC (internal) RFO (pin23) 0.3V FOK (pin12) FOCUS LOOP ON (internal) Fig.4 LOOP ON timing (2) LOOP OFF timing After FOK turns low, the FOCUS LOOP turns OFF after the delay T (s) shown in the figure below. RFO (pin23) 0.3V FOK (pin12) pin8 VB T T=14E3 C In (1+1.5 / VCC) [S] FOCUS LOOP ON (internal) Fig.5 LOOP OFF timing BA6387K Optical disc ICs (3) APC block and AGC block lagc=50A MUTE 20k 20k BL 20k PL 20k 11 FON High-off - + Tr1 13.3k V1 100k - V-I 2.64k + 1M 18 1F 5 1F 6 7 10H 200 PD LD 1F 1k Fig.6 APC and AGC blocks The initial setting for V1 is 1.2V. When PL-BL (the RF AC amplitude) exceeds a certain value (VAGC), then AGC lowers V1 and suppresses the laser power. The value of VAGC is (50A x 20k) = 1V. When defect turns high, Tr1 turns OFF. When FON (pin 11) is low, the LD output (pin 6) becomes high. 4.7 BA6387K Optical disc ICs (4) DET block 37k RFO Bottom hold (long) Charging current 0.1A 1.2V 9 19 3300p Bottom hold (short) Charging current 1A 17.8p 88k - Peak hold (long) Discharging current 0.1A Peak hold (short) Discharging current 1A 30p 200 20 3300p R9 Fig.7 DET block Peak hold (long) (PL) Bottom hold (long) (BL) Peak hold (short) (PS) Bottom hold (short) (BS) PL-VSC BL + (PL - BL) 37k (37k + 88k) Mirror Defect Fig.8 Defect and mirror generation When defect is high, the bottom hold (long) charging current is 50A. The scratch depth (VSC) can be adjusted by changing the resistance at pin 9. VSC = 12 R9 + 200 x 4k The peak hold voltage will not go below (GND + 0.9V) and the bottom hold voltage will not go below (VCC - 0.9V). + + 15 vsc 14 - BA6387K Optical disc ICs !Application example 33 3300p 3300p 20k 0.01 1 0.47 100k EFMO 24 23 22 21 20 19 18 17 RFO RF- RFI VCC PLH BLH CAGC 27k B 27k A 27k C 27k D 28 D 27 C 26 A 25 B ASY EFMI 16 MIRR EFM MIRR 15 DEF To DSP DEFECT 14 FE FE 13 FOK BA6387K 50k 10 30 VB FON 11 33k TE FE' 62k 31 FE' TE 10 29 FEB FOK 12 FON R/H 32 E CAPC E AGND SC 9 22k FO 1 62k F 22k 2 3 4 5 6 PD 7 LD FI F 8 1 1 20k 10 10H 200 PD 1 1k LD Fig.9 BA6387K Optical disc ICs !Electrical characteristics curves 50 180 GAIN GAIN 50 180 PHASE (deg) 0 PHASE 0 0 PHASE 0 -180 -50 1k 10k 100k 1M 10M 100M -50 100 1k 10k 100k -180 1M FREQUENCY : f (Hz) FREQUENCY : f (Hz) Fig.10 RF amplifier frequency characteristics 50 180 GAIN Fig.11 FE amplifier frequency characteristics 0 PHASE 0 -180 -50 100 1k 10k 100k 1M FREQUENCY : f (Hz) Fig.12 TE amplifier frequency characteristics !External dimensions (Units : mm) 9.00.3 7.00.2 24 9.00.3 7.00.2 17 16 9 0.4 25 32 1 8 0.150.1 1.450.1 0.05 0.8 0.40.1 0.15 QFP32 PHASE (deg) GAIN (dB) PHASE (deg) GAIN (dB) GAIN (dB) |
Price & Availability of BA6387K |
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
[Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |