CMV2000 datasheet(25/87 Pages) AMSOSRAM

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CMV2000

Functional description

Datasheet

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7.2

Operating the sensor

This section explains how to connect and power the sensor, as well as basic recipes of how to

configure the sensor in a certain operation mode.

7.2.1

Power supplies

To power the sensor, eight externally generated supplies are required as listed in Table 6.

Table 4: Different power supplies

Supply name

Usage

Description

VDD20

LVDS, ADC

Digital supply

VDD33

Dig. I/O, PGA, SPI, ADC

Analog supply

VDDPIX

Pixel array power supply

Analog pixel supply

Vres_h

Pixel reset pulse

Analog pixel reset supply

The power figures are measured at 48 MHz CLK_IN speed in 16 channels mode while

constantly grabbing images. When idle, the sensor will consume about 30% less energy.

Reducing the amount of output channels will reduce power consumption of the VDD20 supply

and will have the biggest impact on the power consumption.

All variations on the VDD33 and VDDPIX can contribute to variations (noise) on the analog

pixel signal, which is seen as noise in the image. During the camera design, precautions have

to be taken to supply the sensor with very stable supply voltages to avoid this additional noise.

Because of the peak currents, decoupling is advised. Place large decoupling capacitors

directly at the output of the voltage regulator to filter low noise and improve peak current

supply. We advise 1x 330 µF electrolytic, 1x 33 µF tantalum and a 10 µF ceramic capacitor per

supply, directly at the output of the regulator.

Place small decoupling capacitors as close as possible to the sensor between supply pins and

ground. We advise 1x 4.7 µF and 1x 100 nF ceramic capacitor per power supply pin (see pin

list) and 1x 100 µF ceramic capacitor per power supply plane (VDD20, VDDPIX, VDD33).

Vres_h does not need a 100 µF capacitor. See the pin list for exact pin numbers for every

supply. Analog and digital ground can be tied together.

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