BA6387K Rohm, BA6387K Datasheet
BA6387K
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BA6387K Summary of contents
Page 1
... 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. ...
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... DET BLOCK 0.6V FOK HOLD BLOCK LOOP ON FOCUS BIAS FOCUS SWITCH GAIN 6dB TEO 20k BL 20k − − PL 20k 18 − BA6387K EFM − 16 MIRR 15 DEFECT − 13 SCRATCH CONTROL FOK FOK 12 FON RAMP 11 OSC TE TEO 10 13. 2.64k MUTE High=off 7 8 ...
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... Focus OK comparator output 13 FE Focus error output 1 14 DEFECT Defect signal output Mirror signal output 15 MIRR 16 EFM EFM signal output BA6387K Pin No. Pin name Function 17 ASY Auto-asymmetry control input 18 CAGC For capacitor for AGC constant 19 BLH For capacitor for bottom long ...
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... SG1 (SG2) = 60mV Input pin 22 -0.42 -0.30 -0. kHz mV - Input pin 22, 80mV 8.5 11.5 14.5 dB Input pin 17, 80mV 0.90 1. -1.10 -0. BA6387K Conditions - - * , 1kHz P-P + 0.25V, V -0.05V * 1kHz P-P , 1kHz P-P - ± 0.15V * B , 60kHz P 1kHz P-P , 1kHz 60kHz P-P * -0.42V B -0.18V ...
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... V P-P 1 P-P 0.13 0.20 0.27 V 220 340 460 ms 80 124 mV 168 FEO output value -168 -124 mV -80 10.4 13.5 16.6 µA 1.10 1.45 1.80 V 4.0 6.6 10.0 ms 320 400 480 mV 120 200 280 mV BA6387K Conditions - , 500Hz P-P P-P P ...
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... OFF A N SW10 B V7 SW21 V11 V 20k BA6387K SW20 A B 13k 62k 26k A C SW2 1µ Fig.1 BA6387K I1 OFF 91k SW3 SW4 1µ V SW9 OFF C ∼ SG3 ∼ SW8 EFM 16 SW23 15k 10k V MIRR 15 ∼ DEFECT 14 ∼ 15k f SW24 FE 13 SW25 ...
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... Have the feedback resistance 10kΩ or greater. If the DC component of RF rises 0.3V, then FOK becomes high. 20k 0.01µ − + 20k 0.6V Fig.2 RF and FOK block BA6387K 22 − ...
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... Fig.3 Focus error block Set R11 so that I becomes 2µA or greater. Apply biasing to the focus error signal from pin 29 adjustment occurs, pin The timing charts when the focus loop turns ON or OFF are given on the next page. BA6387K + 13 − 20k × 3 ...
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... After FOK turns low, the FOCUS LOOP turns OFF after the delay T (s) shown in the figure below. RFO (pin23) FOK (pin12) pin8 FOCUS LOOP ON (internal) 0.2V 0.4V 0.3V Fig.4 LOOP ON timing 0. T=14E3 ⋅ C ⋅ In (1+1 Fig.5 LOOP OFF timing BA6387K ) [ S] CC ...
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... V AGC When defect turns high, Tr1 turns OFF. When FON (pin 11) is low, the LD output (pin 6) becomes high. High-off Tr1 − V 1µF 1µF 10µ 1µF Fig.6 APC and AGC blocks ), then AGC AGC BA6387K 11 FON MUTE 13.3k V1 2.64k 7 ...
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... Charging current 1µA Discharging current 0.1µA 17.8p 20 3300p Fig.7 DET block PL-V SC Mirror Defect Fig.8 Defect and mirror generation – CC BA6387K − Peak hold (short) Discharging current 1µA 30p Peak hold (long) (PL) Bottom hold (long) (BL) Peak hold (short) (PS) Bottom hold (short) (BS) ...
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... D 50k 29 FEB 10µ FE' 31 FE' 62k 62k F 22k 20k 33µ 0.01µ 1µ BA6387K 1µ 1µ 10 10µH 200 PD 1µ Fig.9 BA6387K 100k 0.47µ EFMO 17 EFMI EFM 16 MIRR MIRR 15 To DSP DEF DEFECT FOK FOK 12 FON FON 11 33k 22k 8 ...
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... Hz) FREQUENCY : f ( Fig.12 TE amplifier frequency characteristics External dimensions (Units : mm) 9.0±0.3 7.0±0 0.15±0.1 0.8 0.4±0.1 0.15 QFP32 50 180 GAIN 0 0 PHASE -180 -50 100M 100 1k 10k Hz) FREQUENCY : f ( Fig.11 FE amplifier frequency characteristics 180 0 -180 1M BA6387K 180 0 -180 100k 1M ...