OV2610

Manufacturer Part NumberOV2610
DescriptionColor CMOS UXGA (2.0 MPixel) Camera Chip
ManufacturerOmniVision Technologies, Inc.
OV2610 datasheet
 


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Analog Amplifier

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O
mni
ision
Image Sensor Array
The OV2610 sensor is a 1/2-inch CMOS imaging device.
The sensor contains 1,984,512 pixels. However, the
maximum output window size is 1618 columns by 1204
rows.
The sensor array design is based on a field integration
read-out system with line-by-line transfer and an
electronic shutter with a synchronous pixel read-out
scheme.
Figure 3
shows a cross-section of the image
sensor array.
Figure 3 Image Sensor Array
Photo Diode

Analog Amplifier

When the column sample/hold circuit has sampled one
row of pixels, the pixel data will shift out one-by-one into
an analog amplifier.
Gain Control
The amplifier gain can either be programmed by the user
or controlled by the internal automatic gain control circuit
(AGC).
Channel Balance
The amplified signals are then balanced with a channel
balance block. In this block, the Red/Blue channel gain is
increased or decreased to match Green channel
luminance level. The adjustment range is +54 dB.
Balance Control
Channel Balance can be done manually by the user or by
the internal automatic white balance (AWB) controller.
10-Bit A/D Converter
The balanced signal is then digitized by the on-chip 10-bit
ADC. It can operate at 12 MHz and is fully synchronous to
the pixel clock. The actual conversion rate is determined
by the frame rate.
Version 1.4, September 15, 2003
Black Level Compensation
After the pixel data has been digitized, black level
calibration can be applied before the data is output. The
black level calibration block subtracts the average signal
level of optical black pixels to compensate for the
temperature and exposure time generated dark current in
the pixel output. The user can disable black level
calibration.
Timing Generator and Control Logic
In general, the timing generator controls the following:
Microlens
Frame Exposure Mode Timing
Frame Rate Timing
Color Filter
Frame Rate Adjust
Frame Exposure Mode Timing
The OV2610 supports frame exposure mode. Typically,
the frame exposure mode must work with the aid of an
external shutter.
The frame exposure pin,
exposure mode enable pin and the
serves as the sensor's exposure start trigger. There are
two ways to set Frame Exposure mode:
Control both
FREX
Exposure mode can be set by pulling both FREX and
EXPSTB pins high at the same time (see
Control
FREX
only and keep
case, the pre-charge time is tline and sensor
exposure time is the period after pre-charge until the
shutter closes (see
When the external master device asserts the
high, the sensor array is quickly pre-charged and stays in
reset mode until the
external master (sensor exposure time can be defined as
the period between
the
FREX
pin is pulled low, the video data stream is then
clocked to the output port in a line-by-line manner. After
completing one frame of data output, the OV2610 will
output continuous live video data unless in single frame
transfer mode.
Figure
Figure 15
show detailed timing of the Frame Exposure
mode.
For frame exposure, register
0xFF and register
GAIN
0x10 (maximum 2x gain).
Proprietary to OmniVision Technologies
Functional Description
FREX
(pin 8), is the frame
EXPSTB
pin (pin 12)
and
EXPSTB
pins - Frame
Figure
13).
EXPSTB
low - In this
Figure
12).
FREX
pin
EXPSTB
pin is pulled low by the
EXPSTB
low to shutter close). After
12,
Figure
13,
Figure
14, and
AEC
(0x10) must be set to
(0x00) should be no larger than
3