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MT9V125_DS Rev. U 3/15 EN 6 ©Semiconductor Components Industries, LLC,2005.

MT9V125: SOC VGA Digital Image Sensor

General Description

The ON Semiconductor MT9V125 is a VGA-format, single-chip camera CMOS active-

pixel digital image sensor. It captures high-quality color images at VGA resolution and

outputs NTSC or PAL interlaced composite video.

This VGA CMOS image sensor features ON Semiconductor’s breakthrough technology—

a low-noise CMOS imaging technology that achieves CCD image quality (based on

signal-to-noise ratio and low-light sensitivity) while maintaining the inherent size, cost,

low-power, and integration advantages of CMOS.

The sensor is a complete camera-on-a-chip solution. It incorporates sophisticated

camera functions on-chip and is programmable through a simple two-wire serial inter-

face.

The MT9V125 performs sophisticated processing functions including color recovery,

color correction, sharpening, programmable gamma correction, auto black reference

clamping, auto exposure, automatic 50/60Hz flicker avoidance, lens shading correction,

auto white balance (AWB), and on-the-fly defect identification and correction.

The MT9V125 outputs interlaced-scan images at 30 or 25 fps, supporting both NTSC and

PAL video formats.

The image data can be output on any one of three output ports:

• Composite analog video (support for both single-ended and differential-ended)

• Low-voltage differential signaling (LVDS)

• Parallel 8-bit digital

Functional Overview

The MT9V125 is a fully-automatic, single-chip camera, requiring only a single power

supply, lens, and clock source for basic operation. Output video is streamed through the

chosen output port. The MT9V125 internal registers are configured using a two-wire

serial interface.

The device can be put into a low-power sleep mode by asserting STANDBY and shutting

down the clock. Output signals can be tri-stated. Both tri-stating output signals and

entry into standby mode can be achieved through two-wire serial interface register

writes.

The MT9V125 requires an input clock of 27 MHz to support correct NTSC or PAL timing.

Internal Architecture

Internally, the MT9V125 consists of a sensor core and an image flow processor (IFP). The

sensor core captures raw images that are then input into the IFP. The IFP is divided in

two sections: the color pipe and the camera controller. The color pipe section processes

the incoming stream to create interpolated, color-corrected output, and the camera

controller section controls the sensor core to maintain the desired exposure and color

balance.

The IFP scales the image and an integrated video encoder generates either NTSC or PAL

analog composite output. The MT9V125 supports three different output ports: analog

composite video out, LVDS serial out, and parallel data out.

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