VV6850 View Datasheet(PDF) - Vision

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VV6850

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

Vision 

VISION V V 6850 & 5850 Sensors: Product Datasheet Revision 1.0

VIDEO OUTPUT

The four-PCK long LS pulse initiates output of a line of video, with the first valid pixel being

sampled after LS falls, and subsequent pixels appearing at AVO as LS propagates along the Hori-

zontal Shift Register. The AVO output for each pixel should then be sampled as close to the end

of the PCK cycle as possible to allow maximum settling time.

PCK

LS

PCK [R]

Samples LS

AVO

PCK [R]

y changes pixel

ron AVO

a¼ PCK max. @ 5MHz

First Valid pixel after

LS is sampled

i n AVO output has settled

Pixel Level Sampling

l The Video Output Chain

i

m

At the top of each column of the array is a sample and hold stage (controlled by COLsam), which

drives the output stage. The purpose of the sample & hold is to ensure that all the pixels in a line

e have the same exposure, as the outputs of a row of pixels are sampled at the same instant. If

COLsam is not used then each pixel will carry on integrating until it is read out. Therefore, since

r all pixels within a line are released from reset at the same time, each pixel will have a different

P integration time, and hence exposure value.

The columns are read out via four output channels. Each channel is multiplexed onto the AVO pin

via an AC coupling stage to restore the DC content. The AVORef pin provides a pseudo-differen-

tial output, obtained from an internal black reference. (The pseudo-differential output stage

cancels out leakage across the coupling capacitors since both output channels experience the

same rate of decay.)

Note: The video at AVO is ‘inverted’, that is Black is higher than White.

8

cd24011a.fm

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