MT9M413C36STM Aptina LLC, MT9M413C36STM Datasheet - Page 25

• Manufacturer Part Number: MT9M413C36STM
• Description: SENSOR IMAGE MONO CMOS 280-PGA
• Manufacturer: Aptina LLC
• Type: CMOS Imagingr

Specifications of MT9M413C36STM

• Pixel Size: 12µm x 12µm
• Active Pixel Array: 1280H x 1024V
• Frames Per Second: 500
• Voltage - Supply: 3.3V
• Package / Case: 280-PGA
• Sensor Image Color Type: Monochrome
• Sensor Image Size: 1280x1024Pixels
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: -5C to 60C
• Package Type: CPGA
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 280
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 557-1153

lens and the sensor, and the "information" is the pic-
ture they are capturing. MTF ranges from zero (no
information gets through) to 100 (all information gets
through), and is always specified in terms of informa-
tion density. In most imaging systems, the MTF is lim-
ited by the performance of the imaging lens. A lens
must be able to transfer enough information to the
image sensor to be able to resolve details in the image
that are as small as the pixels in the image sensor. The
pixels are set on a 12-micron pitch (the center of one
pixel is 12 microns from the center of its neighboring
pixel). Thus, a lens used should be able to resolve
image features as small as 12 microns. Typically, a lens'
MTF is plotted as a function of the number of line pairs
per millimeter the lens is attempting to resolve (more
line pairs per millimeter mean higher information
densities). For an electronic imaging system, one line
pair will correspond to two image sensor pixels (each
pixel can resolve one line). This is equated as:
where LP/mm means line pairs per millimeter and z is
the image sensor's pixel pitch, in millimeters. For the
MI-MV13, z = 0.012 mm, such that the MI-MV13 has 42
LP/mm. Thus, a lens should provide an acceptable
level of MTF all the way out to 42 LP/mm. For most
lenses, the MTF will be highest in the center of the
images they form, and gradually drop off toward the
edges of the images they form. As well, MTFs at low
values of LP/mm will generally be larger than MTFs at
high values of LP/mm. One of the many trade-offs that
09005aef806807ca
MT9M413C36STC.fm - Ver. 3.0 1/04 EN
-------- -
mm
LP
=
---- -
2z
1
1.3-MEGAPIXEL CMOS ACTIVE-PIXEL
25
must be decided by the end user is how high the MTF
needs to be for a particular imaging situation. Gener-
ally, near an image sensor's LP/mm good MTFs are
higher than 40, moderate MTFs are from 20 to 40, and
poor MTFs are less than 20.
Infrared Cut-Off Filters
include a filter in the imaging path that blocks infrared
(IR) light from reaching the image sensor. This filter is
called an IR cut-off filter. Various forms of IR cut-off fil-
ters are available, some absorptive (like Hoya's CM500
or Schott's BG18) and some reflective (i.e., dielectric
stacks). Infrared light poses a problem to visible imag-
ing because its presence blurs and decreases the MTF
in the images formed by a lens. Since human vision
only extends across a narrow range of the electromag-
netic spectrum, camera systems hoping to capture
images that look like the images our eyes capture must
not capture light outside of our vision range. Silicon-
based light detectors (like the ones in the MI-MV13's
pixels) detect light from the very deep blue to the near
infrared. Thus, a filter must exist in the light's path that
keeps the infrared from reaching the image sensor's
pixels. In most cases, it is important that such a filter
begin blocking light around 650 nm (in the deep red)
and continue blocking it until at least 1100 nm (in the
near IR). In most camera systems, the IR cut-off filter is
included in the imaging lens. However, this point must
be verified by a lens vendor when a particular lens is
chosen for use with an image sensor.
In most visible imaging situations it is necessary to
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