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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
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
FIGURE 1. APPLICATION BLOCK DIAGRAM
July 29, 2013
FN6329.2
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