1CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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5V Wide Optical Spectrum Laser Power Monitor IC
ISL58328
The ISL58328 photo sensor IC has a wide optical spectral
sensitivity from 400nm to 1000nm. It is good for multiple light
sources application, such as laser based projectors. ISL58328
has two banks of three sets of gain registers. For a Pico-
Projector application, the two banks of gain resistors can be
used to monitor bias level and peak level of each wavelength.
Bank switching is done by applying a TTL compatible logic
signal to 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 ISL58328 is a single die device that has a
photo detector of 0.7mm diameter in the center of the die.
Photo current signal is amplified through TIA, fine gain
amplifier, and output drivers to convert from current to voltage.
The output of ISL58328 can be configured to be either
differential or single-ended. Gain changing according to each
wavelength is done through 3-wire interface. Registers can be
updated in real time while the device is in operation.
The ISL58328 operates from a single +5.0V supply. It is
available in a space-saving 9 ball glass top BGA package.
Related Literature
•AN1356, “Serial Bus Specification”
•AN1448, “BD/HD-DVD/DVD/CD PMIC”
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
• Single +5V Power Supply
• Serial Interface for Gain Calibration
• Fast Settling Time < 20ns
• Wide Signal Bandwidth > 80MHz
• Wide Signal Gain Dynamic Range > 25dB
•Low Power Consumption
• Low Output Offset < 50mV
• Small 9-Ball Optical Chip Scale Package (OCSP)
(2.2mmx2.2mm)
• SPI 3-wire Serial Interface
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
ITO
DRIVER
LCOS
DRIVER
LASER DIODE
DRIVER
POWER CONVERTER
DIGITAL CIRCUITS
DC/DC
LASER
DIODE
VIDEO
FRONT END
AND
VIDEO
PROCESSOR
3.3V
2.5V
1.8V
1.2V
5.0V
MCU
OEIC
ISL58328
OPTIC FEEDBACK
LCOS PANELS
FIGURE 1. APPLICATION BLOCK DIAGRAM
April 5, 2012
FN6329.1
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ISL58328
2
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without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
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FN6329.1
April 5, 2012
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