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SP8126

High Speed Differential APC Amplifier

Signal Processing Technologies 

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 1

GAIN 2

RGCOM 3

GND 4

SP8126B

8 Pin COB

8 VOUT +

7 VOUT -

6 RGAIN2

5 RGAIN1

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.

VCC

GND

-

TIA

+

GAIN

Gain Control

+

Buffer

-

R1

R3

500

500

R2

500

-

Buffer

+

RGCOM

RGAIN1

RG1

RGAIN2

RG2

Figure 1. SP8126B Functional Diagram and Typical Application

Rev:B Date: 3/18/04

SP8126B High Speed Differential APC Amplifier

1

VOUT+

1VP-P

50pF 1k

(Depend

on FPC)

(Flexible Flat Cable)

VOUT-

1VP-P

50pF 1k

© Copyright 2004 Sipex Corporation

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