1

Rev:B Date: 3/18/04

SP8126B High Speed Differential APC Amplifier

© Copyright 2004 Sipex Corporation

TIA

Buffer

Buffer

-

+

+

-

-

+

50pF

1k

50pF

1k

(Flexible Flat Cable)

R1

500

R2

500

Gain Control

GAIN

GND

R3

500

(Depend

on FPC)

High Speed Differential APC Amplifier

SP8126B

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

Figure 1. SP8126B Functional Diagram and Typical Application

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.

APPLICATIONS

■ DVDRW

■ DVDRAM

■ CDRW

PRELIMINARY

1

2

8

7

6

5

3

4

GAIN

GND

SP8126B

8 Pin COB