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| Optical disc ICs Servo signal processor for CD use BU9321BKS The BU9321BKS is a servo signal processor for CD players that incorporates a double-speed, no-adjustment PLL, program servo, and signal processing block on one chip. It operates off a low power supply voltage, and has low power consumption. FApplications Portable CD players, radio cassette players, and minicomponent systems. FFeatures 1) PLL on chip. Bit clock extraction possible with just a few external components. EFM data modulation is possible. 2) Frame synchronizing signal detection and protection. 3) Servo filters for focus, tracking, and sled are on chip. Characteristics can be controlled using commands from the controller. 4) Sub-code serial output pin provided. 5) Output pins for both P-code and Q-code. 6) CLV sequencer automatically determines the CLV mode. FAbsolute maximum ratings (Ta = 25_C) 7) Track jump sequencer on chip. Possible to jump any number of tracks. 8) De-interleave function, and 2-level error detection, correction and flag processing for C1 and C2. 9) The signal to the DAC is output by the MSB first 2'SCOMP serial out, and offset circuit ON and OFF can be controlled for CD-ROM compatibility. 10) 16 kilobits of on-chip SRAM absorb 4 frames of jitter. 11) Double-speed playback is possible. FRecommended operating conditions (Ta = 25_C) 641 Optical disc ICs FBlock diagram BU9321BKS 642 Optical disc ICs FPin descriptions BU9321BKS 643 Optical disc ICs BU9321BKS 644 Optical disc ICs FInput / output circuits BU9321BKS 645 Optical disc ICs FElectrical characteristics (digital system) DC characteristics (unless otherwise noted, Ta = 25_C and VDD = 2.6V) BU9321BKS 646 Optical disc ICs FElectrical characteristics (analog system) (unless otherwise noted, Ta = 25_C, VDD = 2.6V, RL = 10k and VC reference) BU9321BKS 647 Optical disc ICs BU9321BKS FExternal dimensions (Units: mm) 648 |
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