Vision VV5402 Datasheet

VISION VV5402 Monolithic Sensor

Multi-standard Monochrome CMOS Image Sensor.

PRODUCT DATASHEET

DISTINCTIVE CHARACTERISTICS

• Complete Video Camera on a single chip

• EIA/CCIR standard compatible

• Low power operation (250mW Typical)

• Integral 75Ω driver

• Control options pin selectable for ease of use

GENERAL DESCRIPTION

The VV5402 is a high ly -integrated VLSI

camera dev ice based on VISION ’s unique
CMOS sensor technology. It is suitable for
applicat ions requir ing a compos it e v ideo
output with minimum external circuitry.

The dev ic e inc orporate s a 388 x 295 pixel
image se ns or and all the necessary s upport
circuits to generate fully f orm atted composite
video into a 75Ω load.

• Low light operation to 0.5 lux

• Automatic Exposure and Gain Control

• Automatic Black Level Calibration

• Linear or Gamma corrected output option

• Industry standard 48 pin LCC package

y

level allow us e of a s ingle fixed-aperture lens
over a wide range of oper at ing conditions.
Normal an d Backlit modes furthe r enhance
difficult scene types.

All major control functions are pin selectable
giving maximum flexibility with ease of use. The
VV5402 offers a complete camera syst em with
only a few ex t ernal components.

Automatic control of exposure, gain and black

BLOCK DIAGRAM

DIGITAL

CONTROL

LOGIC.

ANALOG

VOLTAGE

5V

CKOUT

CKIN

SIN

VERTICAL

SHIFT

REGISTER

CLOCK

CIRCUIT

PHOTO DIODE ARRAY

Preliminar

COLUMN SENSE AMPLIFIERS

SAMP LE & H O LD

HORIZONTAL SHIFT REGISTER

REFS.

VIDEO

BUFFER

VIDEO

AMP

AGC
AEC
RESETB
LIN
BKLIT
CCIR

VRT
Vbloom

VOFF
VBG

EBCK
EVWT

2V7

AVO

Pixel Format 384 x 287 (CCIR)

320 x 243 (EIA)
Pixel Size 12µm x 12µm
Array Size 4.66mm x 3.54mm
Min. illumination 0.5 lux (Standard Clock)
S/N Typ ically 52dB
Exposure control Automatic (to 1460 00:1)
Gain Control Automatic (to +20dB)
Power Supply 5v ±5%

Power < 300 mW
Temperature 0

o

C - 40oC

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VISION VV 5402 Sensor

MAIN FEATURES

Main Fe at ures 3
Specifications 5
Pin List 9
Video S ta ndards 12
Examp le Support Circ uit 15

Contents

page

eliminary

Pr

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Main Features

Video Output

The VV5402 delive rs a fu lly -f ormatted
composit e m onochro m e v ideo signa l. S ta nd­ards optio ns include EIA (320 x 244) and
CCIR (384 x 287). On chip signal conditioning
allows user-select ion of linear or gam ma­corrected output.

The in tegra ted 75Ω driver eliminates the need
for additio nal active com ponents t o drive
standar d loads, inclu ding double t erminated
lines.

Automatic Exposure and Gain Control

Automa tic exposure and gain co nt rol are
enabled wi th AEC=1 (pin 21) and AGC = 1
(pin22). H ow ever, If AEC is inhibited by pin
21, AGC is als o inhibited . Inh ibiting AEC or
AGC by tak ing pin 21 or 22 low freeze s th e
current value(s) for th es e.

Automatic Gai n Con tr o l (AGC)

The VV5402 auto m at ic ally increas es t he
system gain of its output stage if with the
current gain setting and maximu m ex posure
the image is too dark. Gain can be varied from
x1 to x16 in times-two steps, giving five
different gain settings.

If the scene is too dark and the integration
period has almost reached its maximum
value, the gain valu e is inc remented by one
step (times two). In the same frame period the
exposure value is divided by two, halving the
integrat ion period. Th e exposure c ontroller
then inc reases the e xp os ure value as nec es­sary. Sim ilarly if the image is too bright and
the integration period is short then gain will be
reduced by one ste p (divide by two) and the
exposure value will be doubled. The exposure
controller can then adjust the exposure value
as nece s sa ry to provide a correctly exposed
image.

Automatic Exposure Control (AEC)

The VV5402 controls ex posure over a range
of 99,000 :1 in EIA mode and 146,00 0: 1 in
CCIR mode, and operates at illumination
levels as low as 0.5 lux at sta ndard clock
frequencies. (The syst em clock frequency can
be reduced to provide increased sensitivity.)

Automa tic exposure c ontrol is ach iev ed by
varying p ix el c urrent integration tim e
accordin g t o t he average light level on th e
sensor. T his int egration time can vary fro m
one pixel c loc k period to on e fr am e period.

reliminary

P

Pixels ab ov e a threshold white leve l are
counted ev ery f rame, and th e number at t he
end of the frame defines the image exposure.
If the image is other than correctly exposed, a
new value for integration time is calculated
and appli ed for the nex t frame. Corre c t ions

are either ±1/8 or ±1/64, depending upon the
degree o f over or under ex posure.

Backlit Mode

The VV5402 can b e c onf igured to o perate in
two auto-exposure modes, selected by the
BKLIT pin (pin28) stat e. The defa ult m ode
(BKLIT = 0) provides exposure control for
normally illuminated scenes . For scenes
where a bright back ground can ca us e the
foreground subje c t to be severely under
exposed, the ‘Backlit’ mode (BKLIT = 1) offers
superior performance.

‘Backlit Mode’ (BKLIT=1) operates by using a
higher threshold level for the exposure control
comparator over the central area of an image,
which is t herefore exposed for longer and s o
enhan ce d. T he area in wh ic h t he higher
compa rat or threshold is used when BK LI T = 1
is illustrat ed below:

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VISION VV 5402 Sensor

Backlit Mode Threshold Area:

Normal operation (BKLIT=0) Higher threshold area (BKLIT=1)

10%

30%

80%

90%

25% 75%

Visible

image

Note: The threshold level used for the central area is a preset mutiple of the normal mode reference

level, and is not alterable.

Exposure

control area

25%

80%

Higher

Threshold

Spectral Resp onse

eliminary

1.0

0.8

Pr

0.6

0.4

0.2

Normalised Response

0

400

500

600

700

800

900

1000

Wavel ength nm

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1100

SPECIFICATIONS

Package Details

Specifications

0.51
TYP

14.22

Viewed from below

1.52 TYP

2.16
PIN 1

1.016 PITCH TYP

13.7

0.55

0.53

The opti ca l array is centred within th e

package to a tolerance of ± 0.2 mm, and
rotated no more than ± 0.5

Toleranc es on pack age dimensions ±10%
Glass lid placement is controlled so that no

package overhang exists.
All dimens ions in millim etres

Glass Lid

Die

Base

Viewed from side

o

y

0.5

0.86

Absolute Ma x imu m Ra ti ngs

liminar

e

r

Parameter Val ue

P

Supply Voltage -0.5 to +7.0 volts
Voltage on other input pins -0.5 to V
Temperature under bias -15
Storage Temperature -30
Maximum DC TTL output Current Magnitude 10mA (per o/p, one at a time, 1sec. duration)

Note: Stresses exceeding the Absolute Maximum Ratings may induce failure. Exposure to absolute

maximum ratings for extended periods may reduce reliability . Functionality at or above these
conditions is not implied.

o

C to 85oC

o

C to 125oC

+ 0.5 volts

DD

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