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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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Wide Optical Spectrum Laser Power Monitor IC

ISL58327

The ISL58327 photo sensor IC has a wide optical spectral

sensitivity from 400nm to 1000nm. It is good for multiple light

source applications, such as laser based projectors. The

ISL58327 has two banks of three sets of gain registers. For a

Pico-Projector application, the two banks of gain registers can be

used to monitor the bias level and peak level of each wavelength.

Bank switching is done by applying a TTL compatible logic signal

to the HL pin. The three sets of gain registers can be used to

adjust optical-to-electrical conversion gain for each RED, GREEN,

and BLUE laser or any wavelength in a spectral range for

application. The ISL58327 is a single die device that has a photo

detector of 0.7mm diameter in the center of the die. The photo

current signal is amplified through the TIA, fine gain amplifier,

and the output drivers to convert from current to voltage. The

output of ISL58327 can be configured to be either differential or

single-ended. Gain changing according to each wavelength is

in real time while the device is in operation.

The ISL58327 operates from a single +5V supply. It is available

in a space-saving 9-ball glass top BGA package.

Features

• High Sensitivity from 400nm to 1000nm with Patented

Technology for Improved Blue Photo Response

• Differential Voltage Output or Single-Ended Output

• Internal Output Reference or External Output Reference

• Serial Interface for Gain Calibration

• Fast Settling Time < 20ns

• Wide Signal Bandwidth > 80MHz

• Wide Signal Gain Dynamic Range > 20dB

•Low Power Consumption

• Low Output Offset < 50mV

• Small 9-Ball Optical Chip Scale Package (OCSP) (3mmx3mm)

Applications

• Optical Power Monitoring

• Laser Based Pico-Projectors or Projection TV

• Laser Auto Power Control for Laser Based Application

• White Balance for LED Based LCoS and DLP Pico Projectors

Related Literature

• See TB478 “PCB Assembly Guidelines for Shell-Op 3D

Package”

ITO

DRIVER

LCOS

DRIVER

LASER DIODE

DRIVER

DC/DC

LASER

DIODE

VIDEO

FRONT END

AND

VIDEO

PROCESSOR

3.3V

2.5V

1.8V

1.2V

5.0V

MCU

OEIC

ISL58327

OPTIC

FEEDBACK

FIGURE 1. APPLICATION BLOCK DIAGRAM

July 29, 2013

FN6577.2

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D REPLACE

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