VV5850 View Datasheet(PDF) - Vision

Part Name

Description

View to exact match

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 

Video Output

AVO Reference

The DC content of the output stage is set by using the SELRef signal to simultaneously put the

internal reference on the AVO and AVORef output channels, and then the CLAMP signal to

charge the amplifier side of the coupling stages to VCL1 and VCL2 respectively. The integrated

5-bit DAC, controlled by Control Register bits CR[15..11], can be used to adjust one or other of

these clamping voltages. The CLAMP signal must fall before SELRef falls. The AC Coupling

Capacitors must be refreshed at least once every still image capture sequence, or every frame of

a live video.

AVO

SELRef

CLAMP

CLAMP

SELRef

Pixel Array

+ Columns

Black

rPeak

White

y

a

i n 2:1

AVO

VCL1

VCL2

VRT

SAMRef

8x8

Pixels

l i m Black Reference

AVORef

e The sensor’s internal black reference, which drives the AVORef output path, is derived from a

r separate 8 by 8 array of pixels connected in parallel. The input voltage to all pixels in the 8 by 8

P array is VRT, that is the pixels are in reset. A sample & hold stage controlled by SAMRef allows

the VRT voltage driving the black reference pixels to be sampled, freezing the black reference

value.

Normally the black level reference should be updated between every still image capture sequence

or between every frame in live video mode. Under very high illumination, however, the black refer-

ence should be sampled between every line in live video mode.

The internal black reference can be sampled at the beginning of a frame using SAMRef. It can

also be observed line by line by asserting SELRef (without CLAMP) in the dead period between

reading rows of pixels out onto AVO.

16/06/97

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