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Version 1.1, March 30, 2007 OmniPixel2 and CameraChip are trademarks of OmniVision Technologies, Inc.

These specifications are subject to change without notice.

Advanced Information

Preliminary Datasheet

OV7725 Color CMOS VGA (640x480) CAMERACHIP

Sensor

mni ision

with OmniPixel2

Technology

General Description

The OV7725 CAMERACHIP™ image sensor is a low

voltage CMOS device that provides the full functionality of

a single-chip VGA camera and image processor in a small

footprint package. The OV7725 provides full-frame,

sub-sampled or windowed 8-bit/10-bit images in a wide

range of formats, controlled through the Serial Camera

Control Bus (SCCB) interface.

This device has an image array capable of operating at up

to 60 frames per second (fps) in VGA with complete user

control over image quality, formatting and output data

transfer. All required image processing functions,

including exposure control, gamma, white balance, color

saturation, hue control and more, are also programmable

through the SCCB interface. In addition, OmniVision

sensors use proprietary sensor technology to improve

image quality by reducing or eliminating common

lighting/electrical sources of image contamination, such

as fixed pattern noise, smearing, blooming, etc., to

produce a clean, fully stable color image.

Features

• High sensitivity for low-light operation

• Standard SCCB interface

• Output support for Raw RGB, RGB (GRB 4:2:2,

RGB565/555/444) and YCbCr (4:2:2) formats

• Supports image sizes: VGA, QVGA, and any size

scaling down from CIF to 40x30

• VarioPixel

method for sub-sampling

• Automatic image control functions including:

Automatic Exposure Control (AEC), Automatic Gain

Control (AGC), Automatic White Balance (AWB),

Automatic Band Filter (ABF), and Automatic

Black-Level Calibration (ABLC)

• Image quality controls including color saturation,

hue, gamma, sharpness (edge enhancement), and

anti-blooming

• ISP includes noise reduction and defect correction

• Lens shading correction

• Saturation level auto adjust (UV adjust)

• Edge enhancement level auto adjust

• De-noise level auto adjust

• Frame synchronization capability

Ordering Information

Note: The OV7725 uses a lead-free

package.

Product Package

OV07725-VL1A (Color, lead-free) 28-pin CSP2

Applications

• Cellular and picture phones

•Toys

• PC Multimedia

• Digital still cameras

Key Specifications

Figure 1 OV7725 Pinout (Top View)

Array Size 640 x 480

Power Supply

Digital Core 1.8VDC +

10%

Analog 3.0V to 3.3V

I/O

a. I/O power should be 2.45V or higher when using the internal

regulator for Core (1.8V); otherwise, it is necessary to provide

an external 1.8V for the Core power supply

1.7V to 3.3V

Power

Requirements

Active

120 mW typical

(60 fps VGA, YUV)

Standby < 20 µA

Temperature Range -20°C to +70°C

Output Format (8-bit)

• YUV/YCbCr 4:2:2

• RGB565/555/444

• GRB 4:2:2

•Raw RGB Data

Lens Size 1/4"

Lens Chief Ray Angle 25° non linear

Max Image Transfer Rate 60 fps for VGA

Sensitivity 3.0 V/(Lux

 sec)

S/N Ratio 50 dB

Dynamic Range 60 dB

Scan Mode Progressive

Electronic Exposure Up to 510:1 (for selected fps)

Pixel Size 6.0 µm x 6.0 µm

Dark Current 40 mV/s

Well Capacity 26 Ke

Fixed Pattern Noise < 0.03% of V

PEAK-TO-PEAK

Image Area 3984 µm x 2952 µm

Package Dimensions 5345 µm x 5265 µm

ADVDD

RSTB

VREFH

OV7725

FSIN

SCL

ADGND

VREFN

AGND

AVDD

SDA

PWDN

DOVDD

XCLK

DOGND

HREF

VSYNC

DVDD

PCLK

7725CSP_DS_00

Functional Description

Version 1.1, March 30, 2007 Proprietary to OmniVision Technologies, Inc. 3

mni ision

Image Sensor Array

The OV7725 sensor has an image array of 656 x 488

pixels for a total of 320,128 pixels, of which 640 x 480

pixels are active (307,200 pixels). Figure 3 shows a

cross-section of the image sensor array.

Figure 3 Image Sensor Array

Timing Generator

In general, the timing generator controls the following

functions:

• Array control and frame generation

• Internal timing signal generation and distribution

• Frame rate timing

• Automatic Exposure Control (AEC)

• External timing outputs (VSYNC, HREF/HSYNC, and

PCLK)

Analog Signal Processor

This block performs all analog image functions including:

• Automatic Gain Control (AGC)

• Automatic White Balance (AWB)

A/D Converters

After the Analog Processing block, the bayer pattern Raw

signal is fed to a 10-bit analog-to-digital (A/D) converter

shared by G and BR channels. This A/D converter

operates at speeds up to 12 MHz and is fully synchronous

to the pixel rate (actual conversion rate is related to the

frame rate).

In addition to the A/D conversion, this block also has the

following functions:

• Digital Black-Level Calibration (BLC)

• Optional U/V channel delay

• Additional A/D range controls

blue

green

microlens

glass

microlensmicrolens

red

7725CSP_DS_003

In general, the combination of the A/D Range Multiplier

and A/D Range Control sets the A/D range and maximum

value to allow the user to adjust the final image brightness

as a function of the individual application.

Test Pattern Generator

The Test Pattern Generator features the following:

• 8-bar color bar pattern

• Shift "1" in output pin

Digital Signal Processor (DSP)

This block controls the interpolation from Raw data to

RGB and some image quality control.

• Edge enhancement (a two-dimensional high pass

filter)

• Color space converter (can change Raw data to RGB

or YUV/YCbCr)

• RGB matrix to eliminate color cross talk

• Hue and saturation control

• Programmable gamma control

• Transfer 10-bit data to 8-bit

Image Scaler

This block controls all output and data formatting required

prior to sending the image out. This block scales

YUV/RGB output from VGA to CIF and almost any size

under CIF.

Digital Video Port

drive current

and can be adjusted as a function of the customer’s

SCCB Interface

The Serial Camera Control Bus (SCCB) interface controls

the C

AMERACHIP sensor operation. Refer to OmniVision

Technologies Serial Camera Control Bus (SCCB)

Specification for detailed usage of the serial control port.

Electrical Characteristics

Version 1.1, March 30, 2007 Proprietary to OmniVision Technologies, Inc. 5

mni ision

Electrical Characteristics

NOTE: Exceeding the Absolute Maximum ratings shown above invalidates all AC and DC electrical specifications and may

result in permanent device damage.

Table 2 Operating Conditions

Parameter Min Max

Operating temperature -20°C +70°C

Storage temperature

a. Exceeding the stresses listed may permanently damage the device. This is a stress rating only and functional operation

of the sensor at these and any other condition above those indicated in this specification is not implied. Exposure to

absolute maximum rating conditions for any extended period may affect reliability.

-40°C +125°C

Table 3 Absolute Maximum Ratings

Ambient Storage Temperature -40ºC to +95ºC

Supply Voltages (with respect to Ground)

DD-A

4.5 V

DD-C

3 V

DD-IO

4.5 V

All Input/Output Voltages (with respect to Ground) -0.3V to V

DD-IO

+0.5V

Lead-free Temperature, Surface-mount process 245ºC

Table 4 DC Characteristics (-20°C < T

< 70°C)

Symbol Parameter Condition Min Typ Max Unit

DD-A

DC supply voltage – analog – 3.0 3.3 3.6 V

DD-C

DC supply voltage – digital core – 1.62 1.8 1.98 V

DD-IO

DC supply voltage – I/O – 2.5 – 3.3 V

DDA

Active (operating) current See Note

a. At 25ºC, V

DD-A

= 3.3V, V

DD-C

= 1.8V, V

DD-IO

= 3.3V

DDA

= {I

DD-IO

+ I

DD-C

+ I

DD-A

}, f

CLK

= 24MHz at 30 fps YUV output, no I/O loading

10 + 8

b. I

DD-C

= 10mA, I

DD-A

= 8mA, without loading

DDS-SCCB

Standby current

See Note

c. At 25ºC, V

DD-A

= 3.3V, V

DD-C

= 1.8V, V

DD-IO

= 3.3V

DDS-SCCB

refers to a SCCB-initiated Standby, while I

DDS-PWDN

refers to a PWDN pin-initiated Standby

1mA

DDS-PWDN

Standby current 10 20 µA

Input voltage HIGH CMOS 0.7 x V

DD-IO

Input voltage LOW 0.3 x V

DD-IO

Output voltage HIGH CMOS 0.9 x V

DD-IO

Output voltage LOW 0.1 x V

DD-IO

Output current HIGH See Note

d. Standard Output Loading = 25pF, 1.2K

8mA

Output current LOW 15 mA

Input/Output leakage GND to V

DD-IO

± 1 µA

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