ADVANCED

SP8027

Rev 0.0 11/22/04. SP8027 High Speed Differential APC Amplifier

Copyright 2004 Sipex Corporation

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SIPEX CONFIDENTIAL, PRELIMINARY & PROPRIETARY. DO NOT DISTRIBUTE OR

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VCC

GAIN

VBG

GND

SP8027

8-Pin

OPLGA

VOUT+

VOUT-

VG2

VG1

FEATURES

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Dual wavelength 650 and 780nm

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150 MHz Bandwidth over all gains

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400 V/µs Slew Rate

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5 ns Setting Time

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10 mV Differential Output Offset Voltage

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Potentiometer, Voltage or DAC programmable gain

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± 6 dB External Gain Adjust

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Small 8-pin OPLGA package

APPLICATION

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CD-R, and CD-RW

GENERAL DESCRIPTION

The SP8027 represents the next generation in Automatic Power Control (APC) amplifiers designed

specifically for demanding pick-up head applications.

Whereas typical APC products exhibit

degradation of bandwidth and slower settling times at higher gain levels, the SP8027 features

constant bandwidth (150MHz) and fast settling times (5ns) across the entire gain adjust range.

With its integrated photo detector, the SP8027 monitors light intensity of the laser diode in CD-R,

CD-RW, DVD+/-R, DVD+/-RW, and DVD-RAM assemblies and converts this light to an output

voltage. The magnitude of this voltage signal corresponds to the laser power intensity and is

subsequently fed back to the laser diode driver to control the laser output power.

The SP8027 on-chip photo detector transforms incident laser light into a proportional current, which

is then converted to a voltage through a trans-impedance amplifier. The SP8027 achieves an

unparalleled level of performance by combining excellent DC stability and low noise with

outstanding AC performance.

The SP8027 is offered with a nominal sensitivity 3600 V/W and is packaged in a 3.0 x 3.5 mm, 8-

lead OPLGA package.

High Speed, Constant Bandwidth

Differential APC Amplifier