CMV2000 datasheet(16/64 Pages) AMSCO

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Reference: CMV2000-datasheet-v3.8

CMV2000 v3 Datasheet

Page 15 of 63

3.5 INPUT CLOCK

The input clock (CLK_IN) defines the output data rate of the CMV2000. The master clock (CLK_IN) is 10 or 12 times

slower than the output data rate, depending on the programmed bit mode setting. The maximum data rate of the

output is 480Mbps which results in CLK_IN of 48MHz in 10-bit mode and 40MHz in 12-bit mode. The minimum frequency

for CLK_IN is 5MHz. Any frequency between the minimum and maximum can be applied by the user and will result in a

corresponding output data rate. The SPI registers with address 114 and 116 must be programmed to the correct

frequency range when the CLK_IN frequency is changed.

CLK_IN

LVDS_CLK 10bit

LVDS_CLK 12bit

5 MHz

50 MHz

60 MHz

40 MHz

400 MHz

480 MHz

48 MHz

480 MHz

n/a

There is no maximum skew for the LVDS input clock (if used) for every frequency used.

3.6 FRAME RATE CALCULATION

The frame rate is defined by 2 main factors.

Exposure time

Read-out time

To simplify the calculation, we will assume that the exposure time is shorter than the read-out time and that the sensor

is operating at default settings, taking a full resolution 10-bit image at 48MHz through 16 outputs. This means that the

frame rate will be defined only by the read-out time because the exposure time happens in parallel with the read-out

time. The read-out time is defined by:

Output clock speed: max 240MHz

ADC mode: 10 or 12 bit

Number of lines read-out

Number of LVDS outputs used: max 16 outputs

If any of these parameters is changed, it will have an impact on the frame rate. In default operation this will result in

340FPS. The total read-out time is composed of two parts: FOT (frame overhead time) and the image read-out time.

The FOT is defined as:

�� = (��_��ℎ + (2 ��

#��

)) ∗ 129 ∗ ��

With fot_length (register 73) at its default value of 10, this results in 32.25µs frame overhead time.

The image read-out time is defined as:

�� = (129 ∗ �� ∗

#��

) ∗ ��

Reading out a full resolution image, this results in 2.924ms image read-out time.

The total read-out time is now the sum of the FOT and the image read-out time, which results in 32.25µs + 2.924ms or

2.9525ms to read-out a single full resolution image. The frame rate is thus 338FPS.

CMV2000 Datasheet(PDF) 16 Page - ams AG

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