SP8057

ADVANCED SP8057 High Speed 11-channel Photo Detector IC FEATURES Dual wavelength 650 and 780nm Data channel bandwidth 150 MHz Selectable gain settings Group delay error 1ns up to 86MHz 250V/µs Slew rate Small 16-pin OPLGA package Vs GND GK HL EI FJ SW1 SW2 1 2 3 4 5 6 7 8 SP8057 16-Pin OPLGA 16 15 14 13 12 11 10 9 VCC WRF D C B A RF+ RF- APPLICATION DVD-RAM with CD-RW capability DVD+/-RW with CD-RW capability Writable data storage optical devices GENERAL DESCRIPTION The SP8057 is an eleven-channel photo detector IC (PDIC) specially designed for high speed DVD-RAM and DVD+/-RW applications and can operate at wavelengths of 650 and 780 nm. The device contains three photo diode (sensor) arrays, with each having four sensors (A – D, E – H, and I – L respectively). The eleven channels consist of four high speed channels (A, B, C, and D), four slow channels (EI, FJ, GK, and HL), two fast channels with paraphase output (RF+ and RF-), and one additional WRF channel. The four slow channels output is the sum of signals from two sensors of the same sensor array (E + I, F + J, G + K, and H + L). The WRF channels output is four times the sum of A + B + C + D channels, while the output signal of paraphase channels RF+ and RF- is only 0.5 of this sum. Low noise operation enables data recovery at very low signal levels. The SP8057 has two logic inputs for gain control that operate as three-state logic input (Low, Mid, and High states). These states are used to selec...