CMV20000 datasheet(21/69 Pages) AMSOSRAM

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CMV20000

Functional description

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DS000440 • v3-00 • 2026-Mar-13

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Functional description

7.1

Sensor architecture

Figure 1 shows the image sensor architecture. The internal sequencer generates the

necessary signals for image acquisition. The image is stored in the pixel (global shutter) and

they are read out sequentially, row-by-row into the analog front-end electronics (AFE) of the

columns. On the pixel output, an analog gain of x2.0, x2.4, x2.8 and x3.2 is possible (or 1.6,

1.9, 2.25, 2.55 when column calibration is on). The pixel value then passes to a column ADC

cell, in which ADC conversion is performed. The digital signals are then read out over multiple

LVDS channels. Each LVDS channel reads out 640 adjacent columns of the array. The AFE

and LVDS drivers are doubled on opposite sides of the sensor, resulting in 2 rows being read

out at the same when all 16 outputs are used. In the Y-direction, rows of interest are selected

through a row-decoder which allows a flexible windowing. Control registers are foreseen for

the programming of the sensor. These register parameters are uploaded via a four-wire SPI

interface. A temperature sensor which can be read out over the SPI interface is also included.

7.1.1

Pixel array

The sensor has 5120 by 3840 active pixels with a 6.4 µm pitch surrounded by two dummy

rows and columns. These dummy pixels at the side will ensure that the optical performance of

the active pixels at the edge, is the same as the one in the active array. These dummy pixels

cannot be read out and will be set permanently to the reset voltage. The pixels are designed to

achieve maximum sensitivity with low noise and low PLS specification. Micro lenses are placed

on top of the pixels for improved fill factor and quantum efficiency.

7.1.2

Analog front-end electronics (AFE)

The analog front-end consists of two major parts: a column amplifier block and a column ADC

block.

The column amplifier prepares the pixel signal for the column ADC and applies analog gain if

desired (programmable using the SPI interface). The column ADC converts the analog pixel

value to a 12-bit value and can adjust its ramp to compensate for small gain differences. All

gain and offset settings can be programmed using the SPI interface.

CMV20000 Datasheet(PDF) 21 Page - ams-OSRAM AG