High Speed Differential APC Amplifier
PRELIMINARY
SP8126B
High Speed Differential APC Amplifier
FEATURES ■ ■ ■ ■ ■ ■ ■ ■ Dual Wavelength Slew Rate of 300V/µ...
Description
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) ..............................
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