SP8056

SP8056 High Speed 10-channel Photo Detector IC FEATURES Dual wavelength 650 and 780nm Data channel bandwidth 130 MHz Eleven selectable gain settings covering 42dB range Group delay error less than 1ns up to 72MHz Slew rate up to 400V/us Small 16-pin OPLGA package Vs Gain 2 Gain 1 Gain 3 EF SAD GH SBC 1 2 3 4 5 6 7 8 SP8056 16-Pin OPLGA 16 15 14 13 12 11 10 9 Vcc RF+ RFC B D A GND APPLICATION DVD-RAM with CD-RW capability DVD-RW with CD-RW capability Writable data storage optical devices GENERAL DESCRIPTION The SP8056 is a ten channel photo detector IC (PDIC) specially designed for high speed DVDRAM and DVD-RW applications and can operate at wavelength of 650 and 780 nm. The ten channels consist of four high speed channels (A, B, C, and D), two average speed channels (EF and GH), two slow channels (SAD and SBC), and two channels with paraphase output (RF+ and RF-). The EF and GH channels output is sum of signals from E + F and G + H sensors respectively. The RF channels output is sum of A + B + C + D + EF + GH channels with identical weights. Low noise operation enables data recovery at very low signal levels. The SP8056 has three logic inputs for gain control, one of them operating as TTL compatible (Gain 1), and two other operating as three state logic inputs (Gain 2 and Gain 3). The allowable 14 logic states are used to select 11 gain factors, an adjustment mode, and a sleep mode (see table 4). Adjustment mode is used to adjust the position of the PD...