Optical Pickup Chipset with CD/DVD Recording Photodetector IC (PDIC) Supports High-Speed Writing to both CD and DVD Media CXA2677GA CXA2676GA The signal processing required for DVD is far more complex than that for CD. Sony has now developed an optical pickup chipset, the CXA2677GA and CXA2676GA, that is appropriate for this complex signal processing. These devices adopt a newly-developed LGA type small package and can contribute to the development of ultrathin pickups. CXA2677GA RF/Servo PDIC ■ Supports high-speed CD/DVD write operations (CD-R: ×52-speed, DVD-R: ×8-speed) ■ WPP1 (A + B) and WPP2 (C + D) outputs, which are optimal for DVD address bit detection ■ Band limiter function for write operations ■ Eight-section photodiode for DPP ■ 16-pin LGA COB small package CXA2676GA Laser front monitor PDIC ■ Two-channel structure (Vin1, Vin2) ■ Chip capacitors (1005) included ■ 8-pin LGA COB small package CXA2677GA The CXA2677GA is a photodetector IC (PDIC) that was developed as the photodetector element for optical pickups used in DVD ±R/RW drives. It features two additional pins: WPP1 (A + B) and WPP2 (C + D). This allows the generation of the WRF signal used in earlier (CXA2660N) CD-R/RW systems with the WPP1 + WPP2 signal and the detection of address bit signal unique to DVD ±R/RW with the WPP1 – WPP2 signal. Also, it adopts a three-stage structure with a write mode and two read modes with high gain and V O I C Despite our busy schedule, we are confident that we succeeded in responding to our customers’ input to the greatest extent possible in the development of these new products. Even though the design period was short, we put careful detailed attention into every single element in these products. We are sure our customers will be fully satisfied. It’s good to be able to relax again now that this project is done. 10 E low gain mode settings. The band limiter function used in write mode provides an average value signal with high precision. CXA2676GA The CXA2676GA adopts a two-channel structure to allow the power of the CD laser and the DVD laser to be set individually. It achieves fast response characteristics, namely a slew rate of 250 V/µs and a settling time of 7 ns. These characteristics are adequate to support write speeds of ×52 for CD-R and ×8 for DVD-R. LGA COB (chip on board) Small Package To increase the number of pins while retaining the package dimensions (4.5 × 3.2 mm) of the earlier chip on board (COB) package, Sony developed a new land grid array (LGA) package that positions the contacts in a two-dimensional array on the reverse side of the package. This allows these devices to provide increased functionality without increasing the mounting area. This package is optimal for developing ultrathin pickups, that is, pickups for use in 9.5 mm ultrathin drives. ×3 2 Vcc High A' 6 Vout Ao ×3 3 Vc A 6 Vcc 9 Vc 1 GND B' 3 SW Low Bo 8 Vc 5 4 Vc Vin1 4 Vin2 ×3 Co 14 VR1 Photodiode Vc IVout ×3 Do 13 ×3.5 Eo 15 ■ Figure 1 CXA2676GA Block Diagram Vc Fo ×3.5 5 Vc Go Vin1 5 6 SW 3 4 Vin2 1 GND Vcc 2 ■ Figure 3 12 Vc 8 IVout C Vout CXA2676GA Pin Configuration Do Co Eo D 2 3 4 5 GND Ho Ao Bo Fo 11 RF+ Ao Bo Co Do E 16 RF– Vcc Vc F Vc ×3.5 Go 12 13 14 15 16 Vc SW RF+ 9 10 11 Vcc WPP2 WPP1 6 7 8 ■ Figure 4 Ao Bo Co Do RF– 1 10 SW Vc D' 7 Vc 7 B C' VR2 1 GND ×3 Vc Ho ×3.5 2 Vc G H B' C' Vc 8 WPP1 A' D' 7 WPP2 ■ Figure 2 CXA2677GA Block Diagram CXA2677GA Pin Configuration 120 35 120 120 35 D C A B 120 H G F 150 φ0.7 mm E Photosensitive area position: At the package center Unit: µm ■ Figure 6 CXA2677GA Acceptance Pattern Dimensions Bottom view Top view 4.5 ±0.1 1.6 4.5 ±0.1 3.2 ±0.1 0.8 Acceptance area Bottom view 0.8 Top view D C A B F E Back side contact Substrate (LGA) ■ Figure 7 CXA2676GA Package Dimensions .5 φ0 16 – 0.8 LA ND Colorless transparent resin Chip 1.25 ±0.1 1.25 ±0.1 Chip 0.8 Transparent resin (includes scattering materials) 0.35 ±0.2 0.35 ±0.2 LA ND 16 – φ0 .5 H G 3.2 ±0.1 ■ Figure 5 CXA2676GA Acceptance Pattern Dimensions Unit: mm Back side contact Unit: mm Substrate (LGA) ■ Figure 8 CXA2677GA Package Dimensions 11