VV5850 Просмотр технического описания (PDF) - Vision

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VV5850

High resolution CMOS Image Sensor with support for external FPN cancellation and serial interface control, available in colour (6850) and monochrome (5850) versions

Vision 

Main Features

MAIN FEATURES

The VV6850 sensor has been developed

specifically for use in image processing appli-

cations requiring pixel by pixel access. Flexi-

ble control options allow many operating

modes, but the VV6850 is ideally suited to

Digital Stills Cameras with electromechanical

shutter exposure control and a frame store

memory available for pixel offset cancellation.

Note: The VV5850 monochrome sensor is

identical in operation to the VV6850, but with

higher sensitivity and simpler image process-

ing, due to the absence of colour filters.

Pixel Array

The pixel array is colourised in a four pixel,

Red, Green, Blue ‘Bayer’ arrangement. This

provides high colour fidelity images with low

colour aliasing. (Other colourisation schemes

can be produced to suit specific application

needs.) The pixel array includes a number of

reference lines, and a useable image area of

992 x 800 ‘valid video’ pixels.

This scheme provides AVO settling to better

than 0.1% at a sampling rate of 5 Msps.

(Higher sampling rates are possible, with

reduced settling accuracy.

Video Output

The multiplexed column outputs are buffered

to the Analogue Video Output (AVO) pin, as

‘inverted’ video, that is Black is higher than

White. An AVORef output is also generated,

from the internal black reference level, to

y provide a pseudo differential output pair.

r A DC component is added to the AVO and

a AVORef signals at the AC coupled output

stages by CLAMPing these to VCL1 and

VCL2, one of which can be set by an internal

DAC. This allows the AVO level to be

matched to the input range of an external

ADC.

i n Serial Interface

Pixel access is by row and column shift regis-

ters. Each row of pixels, or line, is read at the

m same instant, and stored in a sample-and-

hold stage. The columns are then read out

i alternately, and multiplexed through four

output channels to the AVO output stage. The

l image can then be unshuffled and recon-

The serial interface allows an external control-

ler to set certain parameters and to determine

the VV6850’s current state. This is done

through the Control Register, which is loaded

from DIN and examined at DOUT.

The VV6850 receives serial data as one 22-

structed in external buffering and processing

r e circuits.

bit data word, the 20 msb of which are clocked

into a shift register. The shift register contents

can then be latched into the Control Register.

P Typical Application

Sensor

Lens

Serial Data

Frame Buffer

Flash

ADC

Timing & Control

Exposure Control

I/O Processing

Timing

DSP

(Image/colour

processing)

ASIC/DSP

Picture

Storage

16/06/97

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