SP8126

PRELIMINARY SP8126B High Speed Differential APC Amplifier FEATURES ■ ■ ■ ■ ■ ■ ■ ■ Dual Wavelength Slew Rate of 300V/µs Fast Settling Time - 7ns Gain Control 2V Output Swing Low Offset Voltage: < 10mV Low Offset Drift: < 20µV/°C 12dB External Gain Adjust Range VCC GAIN RGCOM GND 1 2 3 4 8 7 VOUT + VOUT RGAIN2 RGAIN1 SP8126B 8 Pin COB 6 5 APPLICATIONS ■ DVDRW ■ DVDRAM ■ CDRW DESCRIPTION The SP8126B is a high-speed, differential output APC amplifier that integrates the photodiode and adjustable gain block on one chip. Independent gain control allows individual adjustment for 780mn and 650nm wavelength operation, as found in CD/DVD optical storage drives. This allows the user to control the laser power of the system in high-speed DVDRW, DVDRAM and CDRW systems. The wide 2V output swing also allows better system performance, through improved dynamic range. GAIN VCC + Buffer VOUT+ 1VP-P R1 500 R2 500 (Depend on FPC) 50pF 1k GND TIA + Gain Control R3 500 (Flexible Flat Cable) Buffer VOUT1VP-P 50pF 1k + RGCOM RGAIN1 RGAIN2 RG1 RG2 Figure 1. SP8126B Functional Diagram and Typical Application Rev:B Date: 3/18/04 SP8126B High Speed Differential APC Amplifier © Copyright 2004 Sipex Corporation 1 ABSOLUTE MAXIMUM RATINGS TJ(MAX) ........................................................................................ 120°C VS(MAX) ............................................................................................... 6V VIN(MAX) ..............................